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380mcn
11-03-2011, 10:28 AM
Hello everybody.
I have an asus g74 and it seems that the screen flickers with a dark background.
If i put the maximum brightness it won't be visible but as it goes down to the minimum the screen starts to flickers. It is a little annoying since i paid 1600eur (2200$).
I have seen other 3 with the same problem. The place where i got it told me it was the inverter. Is yours the same?:confused:

Regarding this issue i don't have any complaint so far (1week of use)

Best wishes

(i don't know the model in question but mine is the one with the i7 2870, 16gb ram, 2hd 500gb, gtx560m 3gb ddr5, no 3D, full hd)

JRd1st
11-03-2011, 10:40 AM
Which inverter would that be?

380mcn
11-03-2011, 10:47 AM
the place where i got it, told me it was the lcd inverter.. something like this http://image.made-in-china.com/2f0j00JBCQyGoWMhbN/Laptop-Inverter-LCD-Inverter-for-Acer-Aspire-1350-1680-2300-5000-Laptop.jpg

JRd1st
11-03-2011, 10:54 AM
Is your new notebook working or is it flickering too?

This is the first time I've heard about an inverter in the notebook. Hopefully, there won't be a rash of bad inverters in our futures!

380mcn
11-03-2011, 11:03 AM
yes it flickers too.. like i said, it is visible from mid-brightness to lowest one, and with a dark (greyish) background..

JRd1st
11-03-2011, 11:14 AM
That's not normal. I guess you should uninstall most of the Asus bloatware, update your drivers from the links in my sig, and see how it goes from there.

I'm having an idea it's your power source. Does this happen on battery, too? Are these like horizontal bars?

Make sure 3d is turned off when you aren't using it, too.

Check back with us and good luck!

380mcn
11-03-2011, 11:24 AM
Asus bloatware has been uninstalled and the drivers updated have been the nvidia, directx, chipset, audio, (didn't update touchpad, wireless)
And yes, it is like horizontal bars/lines..

I haven't checked the power source. Perhaps it can be the european version .. i really don't know but i think the power source is the same worldwide (except the wall plug) .
i really don't use the battery so i'll check it later. (i have a 5yr old compal cl56 with has the battery in mint conditions 2 1/2 hour of life)

update: my model is not the 3D version

JRd1st
11-03-2011, 11:31 AM
Definitely try it on battery.

Horizontal bars sounds like a frequency component from the power source is sneaking into the video somehow. Maybe you have bad filtering for some reason?

Wait a sec, is your battery out of the laptop? A battery sometimes acts as a great filter, actually like a huge capacitor.

380mcn
11-03-2011, 11:39 AM
yes. my battery is still on the pink plastic from the factory.
but it should never happen. if i use the battery all the time in less than 12 months it will wear..

so the power source is sneaking into the video.. the filtering, isn't it done by the LCD inverter after all?

JRd1st
11-03-2011, 11:46 AM
I have no idea what that inverter does, unless you have DC coming out of your wall sockets and the inverter converts it to AC. Converting 12vdc from auto batteries into 120vac @60hz is what inverters do in my experience.

Edit: OK, Googled it! The inverter supplies power to the lcd backlight. You DO have led and not fluorescent backlight?

In your nvidia driver, turn vertical sync on. ... does that even work on the desktop? (Just thinkin' out loud )

380mcn
11-03-2011, 11:53 AM
check out these links about lcd inverter http://www.laptoprepair101.com/laptop/2009/05/04/how-test-lcd-screen-inverter-in-laptop/ and http://www.ehow.com/facts_5004007_what-lcd-inverter.html

JRd1st
11-03-2011, 12:03 PM
I looked it up already, but thanks.

Check my edit on my previous post.

JRd1st
11-03-2011, 12:10 PM
Do displays with LED backlights use an inverter? I guess my understanding of inverters doesn't jive with led's. (This is my first notebook)

380mcn
11-03-2011, 01:12 PM
IMHO, inverters are used with fluorescent and/or led backlight.. i have searched wikipedia http://en.wikipedia.org/wiki/Backlight and this problem seems to be stated about LED backlight..

Flicker due to backlight dimming

LED backlights are often dimmed by applying pulse-width modulation to the supply current, switching the backlight off and on again like a fast strobe light. If the frequency of the pulse-width modulation is too low and or the user is very sensitive to flicker, this may cause discomfort and eye-strain, similar to the flicker of CRT displays.[3][4] This can be tested by a user simply by waving a hand or object in front of the screen. If the object appears to have sharply-defined edges as it moves, the backlight is strobing on and off at a fairly low frequency. If the object appears blurry, the display either has a continuously-illuminated backlight or it is operating at a frequency that is too high for the brain to perceive. The flicker can be reduced or eliminated by setting the display to full brightness, though this has a negative impact on image quality and battery life due to increased power consumption.

new technology, old problems lol.

JRd1st
11-03-2011, 01:45 PM
If you have Power4Gear Hybrid, still installed (one of the 4 Asus apps I kept) there is an option for DTSP that does something that reduces power consumption by the display with very little visible effects. See if that helps.

Put that battery in and see if it helps at all. You're supposed to store it charged, anyway, or it will go bad. :p

380mcn
11-03-2011, 02:54 PM
i usually have it stored 60% charged..

dstrakele
11-03-2011, 03:10 PM
Checking behavior with the battery installed is a good idea.

Have you tried connecting the laptop to an external monitor or LCD TV? If so, does it exhibit the same behavior?

Have you tested on another electrical outlet to confirm you've got a good ground and stable power?

380mcn
11-03-2011, 03:27 PM
it does not flicker in an external monitor that's why i believe it is a hardware issue and not a software one. i have tested with a grounded and not grounded outlet with same results. the only thing i haven't done is using the battery (currently not at home where the laptop is)

JRd1st
11-03-2011, 03:44 PM
I don't really think the battery is the answer because when it isn't charging it's out of the circuit, I would think. But try it anyway.

How dim are you making the display. Seems like 3 notebooks in a row is kind of odd. Maybe you're just making it too dim for proper operation.

BTW, weird question, but do you use fluorescent lighting in the room where your notebook is used? :idea:

dstrakele
11-03-2011, 03:44 PM
the place where i got it, told me it was the lcd inverter.. something like this http://image.made-in-china.com/2f0j00JBCQyGoWMhbN/Laptop-Inverter-LCD-Inverter-for-Acer-Aspire-1350-1680-2300-5000-Laptop.jpg

You are well on your way with troubleshooting. Your retailer appears to believe it is a hardware problem. Since you just purchased your laptop, I would ask if they would exchange it for a new unit without the issue.

JRd1st
11-03-2011, 03:46 PM
That's the 4th one he's seen with that same problem. :confused:

dstrakele
11-03-2011, 03:52 PM
That is concerning. It does not seem reasonable that you could have 4 new units with the same uncommon hardware problem in the same store. It'll be interesting to see if the behavior changes when he installs the battery.

380mcn
11-03-2011, 04:55 PM
i have seen another with the same problem, (i now count 5)
the g74 has 11 levels of brightness. considering 11 as the maximum, from level 7 downwards the flickering is barely visible but it exists.
the flickering is also present even with all the lights off in the room.. and your question is not weird.. 50hz/60hz

update: the ones i saw weren't on the same store. it was from 3 different stores.

JRd1st
11-03-2011, 05:10 PM
You didn't try it on battery yet? To me, it seems silly to not use the battery. The way the charge cycle is on these notebooks, it preserves your battery's life. But whatever . . .

380mcn
11-03-2011, 05:16 PM
no. i haven't tried the battery because i'm still not at home! :p

JRd1st
11-03-2011, 05:17 PM
OK, well I'll wait for that, then. :hmmmmpf: lol

380mcn
11-03-2011, 07:33 PM
got home now and the flicker is the same. (i think it is a little worse actually). I'm having a lot of work to do now.. Photoshop, illustrator, flash, premiere and 3ds max, but when it end i will have it RMA to asus through the store, demanding an lcd inverter exchange.

JRd1st
11-03-2011, 07:36 PM
Does anyone else, see this flicker? I used to see fluorescent bulbs flickering when no one else did. But the bulbs weren't defective.

380mcn
11-03-2011, 09:46 PM
my gf didn't notice UNTIL i told her.. it is a subtle fcliker.. but it exists..

JRd1st
11-03-2011, 09:51 PM
What brightness setting are you using? Ex. I use 67%

Also what is your refresh rate? (Don't think you have much choice there)

ScottinSoCal
11-03-2011, 09:57 PM
I'd be very surprised if this has an inverter in it. Those are used with cold cathode lighting, not LED. He (your computer shop guy) may be describing a common problem that he's seen with older laptops, rather than something he's seen in other G74 laptops.

Referencing back to an earlier post in this thread, PWM for LED light control has driven some people nuts with the flickering. Pulse width modulation works by cycling the power between full on and full off many times a second. For most people it's too fast to see, but a small percent of people can see the flicker and it drives them nuts.

JRd1st
11-03-2011, 09:59 PM
Lol, that makes sense. I knew it was somerthing like that.

BrodyBoy
11-03-2011, 10:05 PM
I'd be very surprised if this has an inverter in it. Those are used with cold cathode lighting, not LED. He (your computer shop guy) may be describing a common problem that he's seen with older laptops, rather than something he's seen in other G74 laptops.

Referencing back to an earlier post in this thread, PWM for LED light control has driven some people nuts with the flickering. Pulse width modulation works by cycling the power between full on and full off many times a second. For most people it's too fast to see, but a small percent of people can see the flicker and it drives them nuts.Doesn't setting to full brightness eliminate that? (My understanding is that LED displays use PWM for dimming.) Of course, it might burn your eyeballs out, so I guess you pick your poison.

380mcn
11-03-2011, 10:14 PM
i use 30%. it is enough to me.
in refresh rate i only have 60hz and nothing more. i have seen others lcd (not this model) with the option 60hz/75hz..

380mcn
11-03-2011, 10:17 PM
and YES. at full brightness this does not occur! like i said, g74 has 11 levels of brightness, at level 8, 9, 10 and 11 the flicker does not exist..

380mcn
11-03-2011, 10:20 PM
I'd be very surprised if this has an inverter in it. Those are used with cold cathode lighting, not LED. He (your computer shop guy) may be describing a common problem that he's seen with older laptops, rather than something he's seen in other G74 laptops.

Referencing back to an earlier post in this thread, PWM for LED light control has driven some people nuts with the flickering. Pulse width modulation works by cycling the power between full on and full off many times a second. For most people it's too fast to see, but a small percent of people can see the flicker and it drives them nuts.

* i think this is the best answer so far.. *

JRd1st
11-04-2011, 12:26 AM
If you use the nVidia settings, you have a more continuous range for your brightness.

ScottinSoCal
11-04-2011, 01:26 PM
and YES. at full brightness this does not occur! like i said, g74 has 11 levels of brightness, at level 8, 9, 10 and 11 the flicker does not exist..

That makes sense, if what you're seeing is the PWM flicker. The more dim the setting, the longer the off cycle, and the more noticeable the flicker (for a small number of people).

If you were in the US, I'd ask if the taillights on new Cadillacs make your eyes hurt - they really bother people who can see the flickering on PWM, but don't bother those who can't see it.

JRd1st
11-04-2011, 02:20 PM
i use 30%. it is enough to me.
in refresh rate i only have 60hz and nothing more. i have seen others lcd (not this model) with the option 60hz/75hz..

Try this, install Asus Power4Gear Hybrid then go into Advanced settings and under Asus P4G Power Setting, make sure Intel DPST is off. I found a post in Asus VIP stating that doing this eliminated flickering on someone's notebook;


Jung (http://vip.asus.com/forum/profile_view.aspx?login=OCUzJBrOzOvwbXpoDYRNRA==&SLanguage=en-us)
VIP Member
Hi, I had a similar problem with my UL50VT. Technical support couldn't help me, but I discovered a solution by myself:

Download the newest version of Power4GearHybrid (1.1.26), uninstall the old version and install the new one. Then, there is an option in the "extended options", where you can disable "INTEL DPST Control". This option seems to have caused the flickering on my notebook - at least, I have not seen it since...

By the way: you have to look for the download under the "Apps" category, it was not shown for my notebook category.

Hope this helps! :D

380mcn
11-04-2011, 02:45 PM
i'll have a try.. again, when i get home.

Looking4Answers
11-04-2011, 02:48 PM
I am also having the same problems with the flicker on my display. I had emailed tech support and there response was to install Asus GPU drivers and then load BIOS to default. None of that worked. I can also confirm that the flicker only happens at mid to low brightness settings, and setting the Intel DPST Control to on makes no difference.

JRd1st
11-04-2011, 06:02 PM
Did you try playing with Gamma and contrast in the nVidia Control Panel? You may be able to find a balance where you get less flicker at a dimmer brightness.

380mcn
11-04-2011, 06:06 PM
i have. same sh$%!!

JRd1st
11-04-2011, 06:31 PM
Did you try the Intel DPST thing? It cuts power use by 25%

380mcn
11-04-2011, 07:24 PM
tried to activate the DPST.. same thing. nothing! flicker continues..

JRd1st
11-04-2011, 07:32 PM
Ummmmmm . . . . blink your eyes real fast! :D

380mcn
11-04-2011, 07:49 PM
next thread mine will be: how i became epilectic..lolol

JRd1st
11-04-2011, 07:55 PM
Rofl

dkillone
11-05-2011, 09:43 PM
Let me guess, you have the CMO1726 panel? Also referred to as, N173HGE-L11/L21 (http://www.chimei-innolux.com/opencms/cmo/products/notebook/products_notebook_N173HGE_L11_L21.html?__locale=en ).

I have the same flicker, and I've seen a few others on NBR forums with the same problem. Obviously, not all the G73/74 will have the flicker because of the panel lottery between them. But as far as I can tell, it happens to all CMO panels. And I guess as explained by scottinsocal, some people will notice it and some wont.

However, it can easily be captured in a photo, i took these pics a while back for a NBR thread.

(Flicker)
http://i.cubeupload.com//t/xv9xik.jpg (http://i.cubeupload.com/xv9xik.jpg)


(No Flicker/max bright)
http://i.cubeupload.com//t/EfZ4Fw.jpg (http://i.cubeupload.com/EfZ4Fw.jpg)

Link to thread(it didnt get many post, but I've seen a few others talk about it in the owners lounge of the G73.): http://forum.notebookreview.com/asus-gaming-notebook-forum/592800-g73sw-screen-flickering-shimmering.html

JRd1st
11-06-2011, 11:01 AM
Amazing! But does everyone with this panel experience this, or only certain people?

Looking4Answers
11-06-2011, 05:12 PM
Amazing! But does everyone with this panel experience this, or only certain people?

I have the g74sx-xc1 purchased from NCIX.com and can confirm that it does have the CMO1726 monitor.

BrodyBoy
11-06-2011, 07:31 PM
Amazing! But does everyone with this panel experience this, or only certain people?
Nope. Ours is a G74SX-DH71 with the CMO1726 panel, and we've never seen it.

I really don't think this reflects a problem with any specific panel, but rather an individual variance in sensitivity to that visual phenomenon. You can read about the same kinds of issues with TV panels and their inverse telecine and frame interpolation algorithms. Most people might think it looks great, but some are so sensitive that particular kind of stimuli that it literally makes them nauseous. I see it as analogous to ringing in the ears, and I feel really badly for those people because there's really not much they can do about it. :(

For those who can't tolerate it in a laptop monitor, I've wondered if there might be a way to set it at full brightness and then use some sort of screen film/cover for dimming.

380mcn
11-07-2011, 09:45 AM
i can tolerate.. ..but never though that a 2000dollars pc would do this..

dstrakele
11-07-2011, 04:06 PM
I'm curious, 380mcn, is the flickering more pronounced on an UNgrounded outlet vs. a grounded one?

380mcn
11-07-2011, 05:07 PM
no, it isn't..

JRd1st
11-07-2011, 07:21 PM
I sent Brian a pm asking him to look at your case and one other.

Brian@ASUS
11-08-2011, 05:25 PM
we are looking into this.

380mcn
11-08-2011, 05:30 PM
ok! thank you both!!

JRd1st
11-08-2011, 05:50 PM
+1 for Brian@ASUS

380mcn
11-08-2011, 05:54 PM
+1 for Brian@ASUS

+2 for JRd1st

Looking4Answers
11-08-2011, 11:56 PM
Great to hear. Been trying to figure out if I should exchange my laptop or have Asus try and fix it. I really hope there is a simply solution as I have had zero problems other then the screen flicker.

JRd1st
11-09-2011, 04:51 AM
This is going to be a hard one since two people can look at the same monitor and see the flickering or not see the flickering. :confused:

380mcn
11-09-2011, 11:07 AM
This is going to be a hard one since two people can look at the same monitor and see the flickering or not see the flickering. :confused:

yes you're right! like i said the store gave me another and phoned me saying 'there is no flickering come and get it'
i got home and the flickering was still noticeable^!

i agree with looking4answers : I have had zero problems other then the screen flicker but i know there isn't any other solution except having the screen exchanged, and like jrd1sr said, it depends if asus is willing to do it, and if the emplyees can really see the flickering.

my gf didn't perceived it until i told her, my parents cannot see it flickering so at the end i think there isn't hope..

JRd1st
11-09-2011, 11:14 AM
There have been users that changed the screen, themselves. I think Chastity did it before she worked for ASUS. The hard part is unsnapping the bezel around the front without damaging the snaps, after that it's a breeze. Plus, if you get the 120Hz screen you need a different video cable. I believe the original has 50 pins and the 120Hz one has 80pins. (not sure about the numbers, but I AM sure you'd need a different cable. )

I turned my screen from the normal 7 I keep it at all the way down to zero, and looked at it from every angle and I saw no flickering. :shrug: I guess my old eyes aren't as fast as they used to be. lol

dstrakele
11-09-2011, 03:11 PM
I'd certainly be checking display models to determine which screen produces no flickering. Since I've been following this thread, I now see flickering when I look out the window at night... ;>{)>

JRd1st
11-09-2011, 03:16 PM
ROFL :D

380mcn
11-09-2011, 05:32 PM
I'd certainly be checking display models to determine which screen produces no flickering. Since I've been following this thread, I now see flickering when I look out the window at night... ;>{)>

update your drivers! :p

380mcn
11-09-2011, 05:36 PM
the bad part is that THIS WEBSITE BACKGROUND makes the flicker worse..

the good part is that in games is not noticeable..

dstrakele
11-09-2011, 05:43 PM
I actually used this web site to test if I could see the flicker. I was unable to see it, so I got out my Canon SD1000 point-and-shoot. I couldn't photograph it (as some other poster has), but I was able to observe flicker when I videotaped it at 30 fps. Furthermore, my 2nd monitor, a VIZIO TV, did NOT exhibit flicker on the 30 fps video of it displaying this web site.

BrodyBoy
11-09-2011, 07:26 PM
There have been users that changed the screen, themselves. I think Chastity did it before she worked for ASUS. The hard part is unsnapping the bezel around the front without damaging the snaps, after that it's a breeze. Plus, if you get the 120Hz screen you need a different video cable. I believe the original has 50 pins and the 120Hz one has 80pins. (not sure about the numbers, but I AM sure you'd need a different cable.
How does a 80-pin cable work with a 50-pin motherboard connector?

JRd1st
11-09-2011, 07:30 PM
You sure its a tp pin connector? Remember Nait's conjectured solution.

BrodyBoy
11-09-2011, 07:58 PM
You sure its a tp pin connector? Remember Nait's conjectured solution.
Heck if I know! ;) But hey, I just discovered something I found interesting. After I saw your post, I was curious about that connector, so I was looking at photos of it. Turns out the G74 M/B is manufactured differently for different display configurations. Here's what ours looks like:

4100 The LVDS connector in the A1/DH71 (maybe all non-3D setups?)

If you look closely, you can see where there's also a place for soldering an alternate connector just above the one in use. In photos posted by BTO, their G74 display & M/B employ that other M/B connector, along with an emitter cable that ours doesn't have. (Ours doesn't even include the emitter connection.)

4101 BTO photos of unspecified G74 model- LVDS connector

They don't say exactly which model that is, but we can see that there are different versions of the G74 motherboard that clearly use very different display cabling. I'd guess this is 3D and non-3D, but in any event, these connector differences should be checked carefully by anyone considering a display swap.

JRd1st
11-09-2011, 08:58 PM
Well if asus agrees to do it, for him, they'll just have to swap motherboards, too. :P I think there's an article on NBR where some guy replaced his display with a different one, and unless it's my memory filling in blanks, it was because his original flickered. I read this before I even owned the G74.

BigOne
11-10-2011, 05:44 AM
Mine does the same thing, it pisses me off big time. I use my computer at night and turn the brightness all the way down. Does not do it when it is all the way up. It looks exactly like the refresh rate is set at 30hz.

BrodyBoy
11-10-2011, 07:49 AM
They all do this....that's the way dimming workds on these LEDs. It's just that some people are sensitive to it.

steveninspiration
11-27-2011, 09:50 PM
They all do this....that's the way dimming workds on these LEDs. It's just that some people are sensitive to it.

So even if we change the screen but still LED backlight LCD screens then the problem will still be there?

BrodyBoy
11-27-2011, 10:15 PM
Well, maybe some could be a little better than others? Not sure about that, but yes, they're all going to use this same dimming technique. :(

Dyoma
11-29-2011, 02:57 AM
2 month passed and mine is flikering too makes me mad, and burns my freaking eyes out!!!
Asus have you found any sollution?

JRd1st
11-29-2011, 03:03 AM
Does Asus even know about this?

)EIB(
11-29-2011, 04:40 AM
I'm noticing the same flicker on my brand new G74sx-xc1 for all dark gray backgrounds (like this forum background and the ASUS ROG Deskstop background screen). It is only noticeable when screen brightness is set to anything other than 100%. It is not very noticeable for most bright colors but it is very noticeable to me for dark gray colors. The weird thing is, it is not noticeable at all for black color either. I wonder if there's anything can be done on the software side to fix this.

On a side note, is there a specific driver for this laptop monitor? When I check under control panel>system>device manager, the monitor driver is shown as "Generic PnP Monitor". Could this flicker problem be a driver issue?

dstrakele
11-29-2011, 04:50 AM
What is the "Hardware Ids" value in the Details tab of your display Properties? That can allow you to find the display manufacturer. My guess is the manufacturer does not supply a specific driver for the display.

JRd1st
11-29-2011, 04:51 AM
It's caused by the led dimmer. I don't think it's cureable. :(

octiceps
11-29-2011, 05:10 AM
I've been having this same problem on my recently purchased G73JH. Thanks for setting the record straight BrodyBoy and JRd1st. At least I can stop worrying now. :)

380mcn
11-29-2011, 10:29 AM
What is the "Hardware Ids" value in the Details tab of your display Properties? That can allow you to find the display manufacturer. My guess is the manufacturer does not supply a specific driver for the display.

no it does not. and it is a harware issue..
CMO1726

steveninspiration
11-30-2011, 08:44 AM
How does the flicker look like on you guys' screen? Just want to compare if we have the same kind of flickering... say you look directly at the middle of the screen and the flicker is on the top and button (say more like a peripheral vision)? or does it occur when your sight is moving from one place to another? or does it happen right at the area you are looking at?

And how long does it take to be happening? right out of the box, weeks, or monthes, etc.?

380mcn
11-30-2011, 10:30 AM
How does the flicker look like on you guys' screen? Just want to compare if we have the same kind of flickering... say you look directly at the middle of the screen and the flicker is on the top and button (say more like a peripheral vision)? or does it occur when your sight is moving from one place to another? or does it happen right at the area you are looking at?

And how long does it take to be happening? right out of the box, weeks, or monthes, etc.?

Mine was right out of the box. It appears in the whole screen, sprecially from the middle to bottom direction.
Like i said, it is noticeable with dark backgrounds (grayish). The worst 'cenario' is this same website. the gray background with the brightness in the minimum makes the worst flicker..

Like jrd1st said once.. i blink my eyes very fast.. lol

steveninspiration
11-30-2011, 10:52 AM
Ok, so I did some research and found that there might be a "solution" (you'll see why I add the qoutation mark)

So most of you guys encounter the flicker when the brightness is set less than a particular amount (say less than 30%), and if it is set to larger than that then there is no flicker. The problem is, however, under the brightness that flicker doesn't occur, it burns your eyes (that's the original purpose why you dim the screen right?)

So can we make the screen bright but not get our eyes burned? Do we wear a non-polarized sun glasses? No, that'd be creazy.

So what do we do then? Here comes my solution:

There're TWO ways to dim your screen actually. One way is to dim the strenth of your LED backlight, and this is how we dim our screen using the Fn+ keys. The other one is to dim your LCD directly! Would it work this way? Here's a hint: you see that whatever brightness you set, the dark background is dark (you prabobly already know what I'm talking about now ;) ) Yes!!! it is the LCD itself that has the power to make the dark part dark even under 100% brightness! so why don't we dim the LCD itself! This way you can set the LED brightness (using Fn+keys) to the level that you don't see the flicker, and then dim the LCD to the "brightness" that wouldn't burn your eyes!

Ok, here's the name of the software I use to dim the LCD: Volumouse. It's actually a software that you can use your scroll to adjust your media volums etc, and it also lets you adjust the brightness of LCD (surpricingly it adjust the LCD instead of LED backlight). Here's the link to their official web: http://www.nirsoft.net/utils/volumouse.html

I now can use the G74SX at night without burning my eyes~! Problem solved!

The reason why I add the qoutation mark to "solution" is that it doesn't fix the hardware itself, but that it is a way to solve the problem when replacing the screen is hardly an option. (I do think that it is NOT right that the flicker happens when dimming the LED backlight though, ASUS should really take that seriously)

Let me know if this works on your G74, there's not much I can help you with the software though. If you find any other solutions please share with us too!

380mcn
11-30-2011, 11:12 AM
Ok, so I did some research and found that there might be a "solution" (you'll see why I add the qoutation mark)

So most of you guys encounter the flicker when the brightness is set less than a particular amount (say less than 30%), and if it is set to larger than that then there is no flicker. The problem is, however, under the brightness that flicker doesn't occur, it burns your eyes (that's the original purpose why you dim the screen right?)

So can we make the screen bright but not get our eyes burned? Do we wear a non-polarized sun glasses? No, that'd be creazy.

So what do we do then? Here comes my solution:

There're TWO ways to dim your screen actually. One way is to dim the strenth of your LED backlight, and this is how we dim our screen using the Fn+ keys. The other one is to dim your LCD directly! Would it work this way? Here's a hint: you see that whatever brightness you set, the dark background is dark (you prabobly already know what I'm talking about now ;) ) Yes!!! it is the LCD itself that has the power to make the dark part dark even under 100% brightness! so why don't we dim the LCD itself! This way you can set the LED brightness (using Fn+keys) to the level that you don't see the flicker, and then dim the LCD to the "brightness" that wouldn't burn your eyes!

Ok, here's the name of the software I use to dim the LCD: Volumouse. It's actually a software that you can use your scroll to adjust your media volums etc, and it also lets you adjust the brightness of LCD (surpricingly it adjust the LCD instead of LED backlight). Here's the link to their official web: http://www.nirsoft.net/utils/volumouse.html

I now can use the G74SX at night without burning my eyes~! Problem solved!

The reason why I add the qoutation mark to "solution" is that it doesn't fix the hardware itself, but that it is a way to solve the problem when replacing the screen is hardly an option. (I do think that it is NOT right that the flicker happens when dimming the LED backlight though, ASUS should really take that seriously)

Let me know if this works on your G74, there's not much I can help you with the software though. If you find any other solutions please share with us too!

1st impression is that it SEEMS that it works, i have tested in my desktop's lcd .. later i will try on the G74..

JRd1st
11-30-2011, 11:28 AM
1st impression is that it SEEMS that it works, i have tested in my desktop's lcd .. later i will try on the G74..
I think this'll help you, finally!

380mcn
11-30-2011, 08:16 PM
update:

this seems to do the job!
put your brightness at maximum and then APPLY the screen brightness option and reduce all the brightness. It affects all monitors attached to it and it seems that works in the following manner: the software reduces the brightness / contrast / gamma / vibrance in the nvidia card, in such a maner than the screen brightness becomes lower.

also i liked it because i don't like the yellowish explorer window background color, and reducing the brightness makes is grayer.

this software does not solve any problem but it's a nice workaround of the flicker problem.

JRd1st
11-30-2011, 10:19 PM
I added volumouse to the New Drivers thread earlier for anyone else with this problem.

Looking4Answers
12-01-2011, 12:44 AM
I personally don't like how volumouse goes about changing the display brightness. It changes the contrast and gamma mostly, and therefore changes the way the colors are displayed without actually adjusting the brightness. These things could be changed through the nVidia control panel if needed but may be quicker using volumouse. I think it is time to RMA and have ASUS replace or fix the display. For me it is unacceptable and a big disappointment for such a otherwise beautiful and well built laptop.

380mcn
12-01-2011, 05:59 PM
I personally don't like how volumouse goes about changing the display brightness. It changes the contrast and gamma mostly, and therefore changes the way the colors are displayed without actually adjusting the brightness. These things could be changed through the nVidia control panel if needed but may be quicker using volumouse. I think it is time to RMA and have ASUS replace or fix the display. For me it is unacceptable and a big disappointment for such a otherwise beautiful and well built laptop.

yes i should rma it, and i did once, and have seen more 3 G74 with the same issue..

Looking4Answers
12-01-2011, 07:40 PM
Decided to try loading ubuntu 10.10 from a usb drive (did not install so drivers were not updated) and no flickering at all. I may download a newer version of Linux and install and update the drivers to see if there is any flickering. Perhaps it is a software or driver problem, but which one could it be as I know people have done fresh installs without all the bloatware. I will let you guys know what happens when I get this done.

dstrakele
12-01-2011, 07:47 PM
+1 Looking4Answers! Good Troubleshooting!

JRd1st
12-01-2011, 08:00 PM
I have an ubuhtu iso in my sticky

Vulkon
12-01-2011, 11:36 PM
Hi :) This is my first post here just to say that I'm experiencing the same flickering at low brightness configurations on my brand new G74SX-TZ286V. I am used to the highest brightness setting and my main worry is if there is the possibility for it to become worse during the G74 lifetime.

dstrakele
12-02-2011, 12:01 AM
I don't believe it will become worse over time. The latest finding is that an Ubuntu installation on a machine with this issue does not display the flickering. This indicates it is likely a driver issue within Windows, rather than a hardware issue. If you do wish to try lower brightness levels, I suggest trying the Volumouse utility workaround.

Vulkon
12-02-2011, 08:22 AM
I don't believe it will become worse over time. The latest finding is that an Ubuntu installation on a machine with this issue does not display the flickering. This indicates it is likely a driver issue within Windows, rather than a hardware issue. If you do wish to try lower brightness levels, I suggest trying the Volumouse utility workaround.

So sending it to RMA would be kinda useless, no?

JRd1st
12-02-2011, 11:48 AM
They need to examine how linux doms leds and write a driver for windows does the same thing.

dstrakele
12-03-2011, 05:02 AM
The issue may also be the result of a driver conflict involving 2 or more drivers. I'd still like to hear more reports from folks who observe this issue and resolve it by video driver uninstallation or booting into another OS.

mikeseth
12-05-2011, 01:35 AM
Count me in because I have the same exact issue. Especially on this website with a dark background. I got my G74Sx from Canada Computers and it has the CMO1726 panel as well (checked in devmgmt.msc, monitor hardware id.)

Looking4Answers
12-05-2011, 03:59 AM
i have loaded ubuntu 11.10 on my laptop but am unable to dim the brightness. When using the slider it does nothing. I have not figured out how to load nVidia drivers and am not sure if that will allow me to dim the display or not. With the proprietary drivers that ubuntu installed I can get 1920x1080 resolution but he graphics come up as unknown. If someone with better knowledge of ubuntu or linux in generally could help or test if they have the same issues as we do, that would be a great.

One thing I did notice is when I booted off the usb drive I was able to dim the display and the flickering was there, but I only had 800x600 resolution avaliable (ubuntu 11.10). When I first tested booting from usb I was using ubuntu 10.10 and did not have the flickering problem.

Vulkon
12-05-2011, 11:43 AM
So this seems to happen with all monitors of this brand. It's sad to see such an annoying problem on a good laptop as the G74sx.

I have sent an e-mail to Asus support center. I want to see what they will recommend and I will gladly share it here.

JRd1st
12-05-2011, 12:17 PM
It may be the dimmer board. It seems to be caused by the way the leds are dimmed, unless there's something wrong with the leds themselves.

dstrakele
12-05-2011, 04:22 PM
So this seems to happen with all monitors of this brand. It's sad to see such an annoying problem on a good laptop as the G74sx.

I have sent an e-mail to Asus support center. I want to see what they will recommend and I will gladly share it here.

I have the CMO1726, run at the LOWEST brightness level all the time, do not observe any flickering on this site (where it is supposed to be prevalent) and am unable to photograph this behavior (as others have done) with a decent Canon camera.

Vulkon
12-05-2011, 05:20 PM
So I have recieved the e-mail from Asus Support, translanting and quoting:

Such issue has been reported. Please, wait for the next BIOS update.

380mcn
12-06-2011, 11:41 AM
i have serious doubts this is an software issue..
i use windows, but i also use the express gate cloud from asus (which is a linux distro) and the flickers is still present.
if they are going to 'correct this with a bios update' IMHO i think they will only increase the minimum brightness level in such a way the flicker will disappear.

I'm sorry but i don't believe asus support regarding this issue!

JRd1st
12-06-2011, 12:06 PM
My latest theory is low grade leds that flicker below a certain voltage. I had a cheap led flashlight start doing that yesterday. Lol Really!

380mcn
12-06-2011, 01:23 PM
My latest theory is low grade leds that flicker below a certain voltage. I had a cheap led flashlight start doing that yesterday. Lol Really!

YEP! totally agree jrd1st

JRd1st
12-06-2011, 02:01 PM
You should send yours in and tell them to stop being cheapo with their premium laptops. I hope repair costs cost them 10x what they saved by being cheap in their manufacturing practices and lack of qa/qc. :p

At least their lack of quality is giving employment to a lot of RMA techs.

mrtopaz
12-14-2011, 04:58 PM
I have the exact same issue.. I sent it in for repair, now a month later they send it back to me, say it's fixed and that they have replaced some parts that was faulty.

but when I start it up the FIRST thing I notice is that it still flickers.. I'm calling the place where I bought it from
tomorrow to get my money back.

and I was going to take the computer home to my parents for christmas.
I guess I can scratch those plans now.

Straffa
01-16-2012, 02:34 PM
I have the same problem (flicker low brightness) Any fix for this or must I send my G74 to Asus?

Andre

dstrakele
01-16-2012, 06:27 PM
Hi Andre.

As you can see from @mrtopaz's #112 post immediately above yours, sending your laptop to ASUS is unlikely to resolve your issue.

@Vulkon's #107 post indicates the issue may be resolved in a future BIOS update:


So I have recieved the e-mail from Asus Support, translanting and quoting:

Such issue has been reported. Please, wait for the next BIOS update.

KRAYGON
01-16-2012, 07:45 PM
I didnt see in the threads that u have tryed the power option yet through windows

my screen was flickering (g72gx) i tryed all the fix's that were on youtube but none worked , then i came across a sreeen flickering thread here in the rog fourms and it said to change the power option in windows to full high performance and save

it worked for me and havint had a screen flicker since might give it a try if you havint already 8)\

kraygon

Straffa
01-16-2012, 08:13 PM
Did not work here

BrodyBoy
01-16-2012, 08:26 PM
Did not work here
The only real solution is to raise the brightness to the point that the flicker is no longer bothersome. This really isn't an issue, but a function of the technology used in modern LCD displays. They attenuate brightness by flickering the image on & off.....to make it darker, the "off" cycle is increased. Most people don't really notice it, but some, unfortunately, are sensitive to the resulting effect.

An RMA can't "fix" it, because there's defect or malfunction involved. One possibility, for owners especially bothered by the flicker, would be raising the brightness way up, and then using a tinted screen cover/protector for dimming. I realize that's far from ideal, but it might be the only option given the technology.

Looking4Answers
01-17-2012, 12:23 AM
The only real solution is to raise the brightness to the point that the flicker is no longer bothersome. This really isn't an issue, but a function of the technology used in modern LCD displays. They attenuate brightness by flickering the image on & off.....to make it darker, the "off" cycle is increased. Most people don't really notice it, but some, unfortunately, are sensitive to the resulting effect.

An RMA can't "fix" it, because there's defect or malfunction involved. One possibility, for owners especially bothered by the flicker, would be raising the brightness way up, and then using a tinted screen cover/protector for dimming. I realize that's far from ideal, but it might be the only option given the technology.

I beg to differ.

There is a defect/BIOS/software problem as I have looked at other g74sx in stores that have the exact same displays as mine and they do not have any noticeable flicker when I lower the brightness. I am not sure if it is a BIOS issue as most g74sx ship with BIOS 201 and I immediately updated my BIOS after receiving it. I cannot find BIOS 201 to download and it does not come on the software cd. I requested it from tech support and they have not responded in over a week.

BrodyBoy
01-17-2012, 12:43 AM
You don't think it's possible that the store lighting affected your perception, of both the brightness and the flicker? I think you have to sit them side-by-side to compare in the same environment.

I'm not dismissing your recollection....I don't think any of us can trust our auditory and visual memory enough to make a precise comparison between sounds or images we see at different times.

(If there are still display models in stores that are running BIOS v201, couldn't you go in and (sneakily) make a copy? ;) I think either WinFlash or Live Update lets you make a back up of the BIOS....)

Chastity@ASUS
01-17-2012, 07:01 PM
Anyone with a G74 and screen flicker, please contact me for RMA. I know what is affecting them, as my G74 here had the same issue, but is now fixed. Please give me your personal info, contact info, and model and serial number. (North American customers only, other customers please contact your regional ASUS Customer Support)

BrodyBoy
01-17-2012, 09:14 PM
Anyone with a G74 and screen flicker, please contact me for RMA. I know what is affecting them, as my G74 here had the same issue, but is now fixed. Please give me your personal info, contact info, and model and serial number. (North American customers only, other customers please contact your regional ASUS Customer Support)
What is it that's affecting them, exactly?

wing537
01-24-2012, 04:12 AM
What is it that's affecting them, exactly?


Anyone with a G74 and screen flicker, please contact me for RMA. I know what is affecting them, as my G74 here had the same issue, but is now fixed. Please give me your personal info, contact info, and model and serial number. (North American customers only, other customers please contact your regional ASUS Customer Support)

Please let us know what exactly is causing this issue. I do have this screen flicker on my G74 in low brightness condition but since I had the machine I have been maxing out the brightness to avoid seeing the flicker. Does the "fix" involve replacing the entire screen? Will the "fix" get rid of the flicker 100%? I would hate to have to go through the RMA process only to find out the issue still exists when it is returned and I think many others here with the same issue feels the same way.

Looking4Answers
01-24-2012, 01:39 PM
Starting to wonder what is going on as I PM'd Chastity 6 days ago to set an RMA and have not heard a thing back.

I think we all want to know what this fix consist of.

Please let us know how the flicker can be fixed.

BrodyBoy
01-24-2012, 07:12 PM
Yeah, I've seen few similar reports of no response.

Did you try to PM him over on the NBR forum? Obviously, you shouldn't have to, since he posted the contact request here, but.....oh well.

)EIB(
01-26-2012, 02:20 PM
Please respond Chastity. Thanks.

)EIB(
01-28-2012, 06:53 PM
Starting to wonder what is going on as I PM'd Chastity 6 days ago to set an RMA and have not heard a thing back.

I think we all want to know what this fix consist of.

Please let us know how the flicker can be fixed.

Did you ever got a reply back on your PM to Chastity? apparently, threads don't get responses on here.

chrsplmr
01-28-2012, 07:43 PM
Chastity, as I understand it has been training and other duties.

EIB.. do you have an issue.. did you start a thread?

patience is all that is usually required for a response.c.

BrodyBoy
01-29-2012, 02:22 AM
It's been mentioned several times here that Chastity isn't around much anymore and han't been responding to PMs. Try him on NBR, as previously suggested. He's much more active there.

Kuriso
01-30-2012, 03:37 PM
Hello everyone. I'm new here. Wanted to join in and add my machine to the list of problems. I just got my G74 and I'm having some of the same issues on a brand new NewEgg G74sx-nh71 rt. The first thing I did was wipe it clean, install fresh drivers, and run windows update. I wanted to get rid of any bad or buggy software. I was missing 1 driver a PCI compact something... I don't remember the name right now. My ROG button isn't working either. I used all the drivers from JRd1st's post that I thought I needed and that one still showed up missing in the device manager. Windows update fixed the PCI device but idk if its right. If anyone knows what that could of been let me know.

Anyways on to my screen flicker problem...

My screen flickered really bad at low dim settings. The screen also had a really heavy blue tint. To fix my blueish screen I went into the nVidia settings and reworked my colors. With each channel I adjusted the contrast, brightness, and gamma to my liking. I cut the digital vibrance down a little too. I wasn't expecting it to fix the flicker but so far this seemed to fix it. IDK if this will help anyone else but its working for me for now.

IMHO, pretty crappy for a machine that's suppose to be a high quality gaming rig. Luckily right now I'm not having the mouse pad issue and everything else seems to be running good. I did however have a sleep mode crash last night and recovered from a blue screen. I'm about to go post that in the other thread.

BrodyBoy
01-30-2012, 07:34 PM
I was missing 1 driver a PCI compact something... I don't remember the name right now. My ROG button isn't working either. I used all the drivers from JRd1st's post that I thought I needed and that one still showed up missing in the device manager. Windows update fixed the PCI device but idk if its right. If anyone knows what that could of been let me know.
That was the Intel MEI. WIndows Update noticed the missing driver and installed it for you.

atst2000
03-08-2012, 02:56 AM
Hi, I just recently bought my G74SX-BBK9 from Best Buy and has the same screen and same issue with the flickering.

Has anyone heard back from ASUS about this issue, or any fixes, updates?

dstrakele
03-08-2012, 05:00 AM
See this post in this very thread - http://rog.asus.com/forum/showthread.php?5536-Asus-G74-screen-flicker-(dark-backgrounds-and-low-brightness)&p=64937&viewfull=1#post64937

380mcn
03-22-2012, 12:00 PM
1.chastity wen away.
2. problem is present. (i try to ignore because it only happens in certain conditions)

the end of story

marslove
04-04-2012, 09:17 PM
So there is an obvious problem which asus doesn't want to solve? Seems like a "FU customers" to me:((

kouotsu
04-05-2012, 04:29 AM
I got approved for RMA for this issue, and Asus was replacing my screen when they called me today. So you should not have an issue getting RMA approval for it, I think. Just make sure you set your desktop background to something that intensifies the flickering so it will be obvious.

Unfortunately, the reason they called me was to tell me my speaker rattling is not a hardware issue, but a "plugin" I had installed. Ugh! They didn't have an answer for what the supposed plugin was, so it seems like they just put a hard drive in it with the stock image and didn't notice any rattling. It's true that it doesn't happen as often with stock settings, but it definitely DOES happen... I told him about the sticky in this forum which shows the rattling speaker is a common issue. Also told him I'm pretty sure you can hear the rattling slightly during BIOS startup, which rules out any Windows "plugin". He said he'd tell them to take another look at it. Would be nice if they were able to fix that.

marslove
04-05-2012, 10:34 AM
Thanks for your answer:) Little bit sad it's a hardware issue i really hoped for it to be soft... but now i finally know what to do with it. Thanks again.

MaXimus711
04-05-2012, 10:40 AM
This is the exact same issue I faced with my G73Sw!

Refunded the laptop immediately!

My ASUS G73Sw Horror Story! (http://rog.asus.com/forum/showthread.php?12400-My-ASUS-G73Sw-Horror-Story!&country=&status=)

kouotsu
04-10-2012, 04:28 PM
So I got my G74 back from RMA today, and they didn't fix anything! The screen still flickers on low brightness, and it happens on the desktop background THEY set it to, so there's no excuse for missing this. As for the rattling speakers I complained about, they insisted it was a software problem and reloaded my OS. Guess what? They still rattle! This is just silly.

They also reloaded my OS with a version customized for Best Buy, which is NOT where I bought mine.

BrodyBoy
04-10-2012, 04:46 PM
So I got my G74 back from RMA today, and they didn't fix anything! The screen still flickers on low brightness, and it happens on the desktop background THEY set it to, so there's no excuse for missing this. As for the rattling speakers I complained about, they insisted it was a software problem and reloaded my OS. Guess what? They still rattle! This is just silly.

They also reloaded my OS with a version customized for Best Buy, which is NOT where I bought mine.
If it still has your original hard drive, hopefully you can do a factory restore to get rid of the BB customization.

Perhaps there are some display units that do have an actual defect, but remember, this particular display technology does inherently flicker at low brightness. That's just the way it works, and some people are going to be more susceptible to its effects.

Did they replace your display?

kouotsu
04-11-2012, 12:54 AM
Yes, they called me while they were repairing it, saying they were able to replicate the problem and are replacing the screen. That indicates to me that my screen should not be flickering on this model, yet after replacing it the flickering continues and they sent it back anyways. Also frustrated about the speakers, given they are still reverberating on this factory OS that I haven't edited in any way. It's a shame I just have to live with a shoddy product because there's no way I can send it back again. I rely on this laptop too much for freelance work.

I have an image of my old OS but I'm just going to make due with this BB load. They DID unintentionally solve my problem of Netflix not asking to stay fullscreen for some reason. lol

LaFours
04-12-2012, 12:42 AM
Hi All - first post here. My name is LaFours and i am a Screen Flickerer.

It looks like it might be a dead end, but I went ahead and PM'd Chastity - anyone ever hear back? I'm doing all right with the Volumouse work around but can't say I'm happy that this seems to be the only course of action. Was about to call the service center but this thread isn't exactly getting me pumped to try that route.

Anyway, I'll give it a few days while I try and sort this out but I really hope it doesn't come to returning the lap top - loving the machine otherwise!

storm78
04-15-2012, 09:24 AM
Hi all,

i hava a G73SW and have the same flickering problem. I have read this thread carefully and as i understand there is no solution for this issue except the full backlight and lowering lcd's own brightness workaround (or whatever you call it :) )
I also e-mailed to asus support and they say send your laptop to asus service center. But i know if i send my laptop to asus they won't notice the flicker and they will send me the laptop back with lots of possible scrathes or so. Or maybe they will at best open the guts and then close everything and they'll say this laptop has no problems. I have to a conclusion that it will be best solution to not to send the laptop to asus' service center but to get use to flickering with low brightness. Except this flickering issue the laptop is very good actually. But i agree with people that say for a $2200(here in Turkey) laptop that has to be very high quality this seems definitely a cheap quality screen or parts.

Regards.

saltsal
04-19-2012, 01:07 AM
Hi! Having exactly same problem. Any luck with finding solution? Please let me know.
PS. Chastity no replying too

alrey
05-02-2012, 12:21 AM
Hi all,

i hava a G73SW and have the same flickering problem. I have read this thread carefully and as i understand there is no solution for this issue except the full backlight and lowering lcd's own brightness workaround (or whatever you call it :) )
I also e-mailed to asus support and they say send your laptop to asus service center. But i know if i send my laptop to asus they won't notice the flicker and they will send me the laptop back with lots of possible scrathes or so. Or maybe they will at best open the guts and then close everything and they'll say this laptop has no problems. I have to a conclusion that it will be best solution to not to send the laptop to asus' service center but to get use to flickering with low brightness. Except this flickering issue the laptop is very good actually. But i agree with people that say for a $2200(here in Turkey) laptop that has to be very high quality this seems definitely a cheap quality screen or parts.

Regards.

i solved this problem accidentally. im using the notebook on my lap when slipped and about to fall on the floor.. i instantly reached for it and saved it from falling but i closed the lcd lid hard in the process. guess what.. the flickering is gone after that!

dstrakele
05-02-2012, 12:45 AM
Ah! Another variation of the "hit it with a hammer" approach. I suspect they use that technique a lot at the ASUS service centers...
;>{)>

dataDave
05-02-2012, 12:58 AM
Same issue here. I think I'll give it a year before attempting to slam my lid open and shut though. :)

I can't wait until I have enough room for a desktop, then I can narrow down issues like this easier, and get reviews on each individual component.

dstrakele
05-02-2012, 01:16 AM
Be aware there appear to be 2 "flickering on dark background" issues. One appears to be hardware-related. One occurs in games when running the most recent video drivers. It is worthwhile to attempt all possible software fixes first.

ny2lond
05-23-2012, 03:00 PM
Hi! Having exactly same problem. Any luck with finding solution? Please let me know.
PS. Chastity no replying too


I finally managed to find a solution to the flickering. It is weird, but hey... it works.

I have downgraded my driver to 285.79 - it's faster in Metro! and it resolves the horizontal lines issue.

Open Nvidia Control Panel ->Adjust desktop size and position and select full screen.

Next, go to change resolution -> Customize -> Create Custom resolution -> Type 67 in refresh rate. Make sure Scan type is set to Progressive and hit test. If all works well, select yes.

* * * After this, there should be a Custom with you creation, above PC list. Select it, press the drop-down list and select 67 Hz with 32-bit Colour depth and hit apply.

If creating the custom resolution doesn't work (ex: it tells you it is not supported) type 132, select Interlace and hit test. Whatever happens (mine did some weird display glitches and I unplugged the laptop scared like s**t) just hit Esc.

If nothing works, just type 33 Hz, Select Progressive and hit test, it should wotk. If it does, select no and then type again 66 (probably some driver bugs).

Whatever way you manage to create that 66Hz, allways do the "* * *" part

Here is a site to test it, because of the background (It's the one that made me do all these tests): http://www.3dtotal.com/index_gallery...s#.T7z1_EUnxkw

Now... Some people here say it's a hardware-created problem. Well, this shows it is. Here is the explanation. The Brightness LED's work in a frequency multiple of somewhere around 67Hz. As the display has a 60 Hz refresh rate, that makes a 7 Hz offset, which creates the flickering. It's like in sound - the resonance effect.

A non software way (and permanent as well) is to open the display cover and search for a special diode on that circuit board you guys were talking about (inverter?!). That has a screw-like cap and by doing some tests, you could calibrate it.

EDIT** It's 67 Hz, not 66. After some thorough testing it turned out 66 is still out of range.

Looking4Answers
05-29-2012, 07:18 PM
WOW!!!!! This actually works, thank you so much. I had given up on a fix for the problem and did not expect Asus to fix anything. Anyone having this problem, read ny2lond post and read carefully. You need to do the second part in order for it to work. I did not have to downgrade to do this, I actually just upgraded to the latest 301.42 Verde drivers and it works. Hopefully this fix will not cause other issues due to the refresh rate being 67.

Great Job ny2lond

380mcn
05-30-2012, 04:16 PM
IT WORKS!

BTW, i want to add the following.


After creating the 1920x1080 67hz profile on Nvidia Control Manager, APPLY, Close
You have to right click on desktop > Screen Resolution > Advanced Settings > Monitor Tab > Screen Refresh Rate > 67hz!

ny2lond, YOU ARE A TRUTHFULLY SAVIOR ! if this was reddit, you would get an upvote!

PS. No need to downgrade drivers, looking4answers is right, it works with the latest Verde drivers!
PS. Romania Rulez!

storm78
05-31-2012, 12:20 AM
Hello,

This solution indeed works. Thanks a lot man, you're a hero...
Asus did nothing except employing incompenent tech stuff and sending the laptops back unfixed. Thanks Asus, go on like this and no one will ever get an asus laptop again ... Bravo ...

PS: when this flickering first occured i remembered my old CRT monitor and how we can change the refresh rate to at least 75 hz but i thought it is not possible on lcd screens. So thank you again for letting us know that it is possible using nvidia settings customizations and explaining that 67 hz stuff.

by the way i bought another laptop which its brand is acer aspire and in here it is known that acer is no quality brand. Guess what : NO FLICKERING whatsoever and actually it is quite well built for $1000 laptop , only minus is resolution is 1366x768.
I was about to sell this asus laptop but after your solution i think i can stick with it some more time.

THANK YOU BIG TIME .

OldNESJunkie
05-31-2012, 03:21 AM
Yahoo, it does indeed work. In fact I was able to set my monitor to 75hz refresh rate set to Progressive. MUCH better. I thought about trying this but never got around to it because I was under the assumption this LCD panel would only support 60hz. In Device Manager my panel says "MONITOR\LGD02D1".

ny2lond
06-01-2012, 12:22 AM
IT WORKS!

BTW, i want to add the following.


After creating the 1920x1080 67hz profile on Nvidia Control Manager, APPLY, Close
You have to right click on desktop > Screen Resolution > Advanced Settings > Monitor Tab > Screen Refresh Rate > 67hz!

ny2lond, YOU ARE A TRUTHFULLY SAVIOR ! if this was reddit, you would get an upvote!

PS. No need to downgrade drivers, looking4answers is right, it works with the latest Verde drivers!
PS. Romania Rulez!

Thanks mate! I am glad I did help you all.

P.S. The reason I downgraded the drivers is because on certain dark shades there are horizontal lines(2 px wide). That is a driver issue, as the lines do not appear in the driver I told you to downgrade to. To test it, go here (the image has no lines. if you see them, you also have the issue): http://s19.postimage.org/qtkznw0e9/testimage.png

ny2lond
06-18-2012, 11:39 AM
Guys, use the latest beta drivers from geforce.com. They finally got it right with the horizontal lines I told you about. Unfortunately, you still need to do the 67 Hz tweak.

http://www.geforce.com/drivers/results/46046

soh299
06-22-2012, 03:33 AM
Hi, was gonna try the 67Hz solution, but just wondering would it by any chance spoil the LCD?

Got pretty concerned after reading the disclaimer when i tried to customize custom resolution. :(

DrBeltway
06-26-2012, 12:14 AM
There are all kinds of situations that are next-to-impossible to predict, not to mention mistypes, mistakes and accidents.

The chance of hurting the LCD is probably extremely low, but the disclaimer is there for those rare exceptions. I don't want to spook anyone but it's possible that some component in the LCD is sensitive to refresh rates above 60Hz. It's also possible that the LCD will fail prematurely even at the standard refresh rate.

In the end, you have to weigh the risk against how much the issue (flickering) bothers you. There are several people here who have changed refresh rate to 67Hz and said it solved the flickering problem - and nobody has reported an LCD failure from it yet.

It's interesting (at least to me) that so few people seem to be sensitive to the flickering. I barely notice it myself, but I tried ny2lond's solution, changed the refresh to 67Hz, and that fixed it. (Thanks ny2lond!)

There's got to be a better way to change the backlight LEDs brightness that won't interact badly with the screen's refresh rate. Too bad our LCD mfgrs aren't using it. Mine is a Chi Mei (CMO1726).

ny2lond
07-02-2012, 07:03 AM
LCD panels are pretty hard to break. Increasing the refresh rate won't hurt it in any way (i got mine to a stable 115 HZ and nothing happened - don't do the same, mine was just for testing). If there are anomalies, the test will send an "unsuccessful test" error. The worst that happened to me was for the screen to go blank showing lines, like in a broken LCD. All i did was to get out the battery unplug the laptop and restart it.
LCD panels have certain ranges of resolutions and refresh rates that are supported. Plus, this is what ASUS responded to me:

"Dear valued customer,

Thank you for contacting ASUS Customer Service.

Thank you for your advise, If other customers have the same problems, I will share your solution to fix the flickering problem in G74SX model. Thanks again."


@DrBeltway: The issue appears to happen only on Chi Mei (CMO1726).

Tear_a_Bee
07-03-2012, 05:24 PM
I tried the 67hz solution but it didn't work for me. I still get flickering on this site: http://www.3dtotal.com/index_page.php?id=8#.T7z1_EUnxkw

DrBeltway
07-04-2012, 09:08 AM
To rule out the obvious, you did go back after making the custom resolution, select it and hit apply and OK, right? I forgot when I tried it the first time. :rolleyes:

Which LCD panel do you have? (Device Mgr, Monitors, Double click "generic PnP...", click details tab and look under Hardware IDs in drop-down box)

As ny2lond pointed out, the flickering issue seems to be unique to Chi Mei (CMO1726) panels, but maybe you either have another panel using different backlight frequency OR Chi Mei could have made your LCD with slightly different component.

Either way, it looks like you'll have to do as ny2lond did and experiment, trying different refresh rates and testing after each one to find the ideal rate for your particular panel.

Thanks again to ny2lond's testing, we know the CMO1726 panels should have no trouble with custom refresh rates up to 115Hz. Just guessing, but I think the right rate shouldn't be too far away from 67Hz.

Good luck and please post what you come up with.

Arvizu360
07-05-2012, 01:32 AM
This works! great :)

muzhik
07-09-2012, 02:42 PM
works, fixed the flickering... thanks

DaManWitDaPlan
08-10-2012, 07:22 AM
Which LCD panel do you have? (Device Mgr, Monitors, Double click "generic PnP...", click details tab and look under Hardware IDs in drop-down box)

I'm having the same problem on a G75VW, and the solution didn't work for me at 67 or 75 hz... Still those horizontal lines.

I have a CMO1720 monitor, as found in the device manager.

I'm currently just testing a bunch of refresh rates. I have the latest verde driver installed. Any ideas?

DrBeltway
08-11-2012, 04:35 AM
I never saw horizontal lines myself, so I don't know if refresh rate changes would affect them. I would guess not, though. My issue was a very subtle flickering effect on certain backgrounds.

Apparently the lines have been fixed for some by downgrading NVidia drivers to version 285.79

More info in THIS (http://rog.asus.com/forum/showthread.php?11405-G74-Horizontal-lines-on-screen) thread.

If the older driver doesn't work, it might be worth it to try the latest BETA Verde driver (http://www.geforce.com/drivers/beta-legacy).

In the end, if you don't want to stick with older video drivers and you're not opposed to RMA'ing the notebook, I would highly recommend it. First, however, if downgrading drivers helps, I would send NVidia some feedback on their driver forum with your notebook and monitor info. They tend to be pretty good about working with monitor makers and getting fixes out (eventually).

ny2lond
08-18-2012, 10:17 PM
I'm having the same problem on a G75VW, and the solution didn't work for me at 67 or 75 hz... Still those horizontal lines.

I have a CMO1720 monitor, as found in the device manager.

I'm currently just testing a bunch of refresh rates. I have the latest verde driver installed. Any ideas?


I changed my G74 for a G75 (the RMA ****ed mine up when it was in the 1st time, so i had to wait 2&1/2 weeks without my main workstation), so i can try and help you.
First of, install the beta drivers from Geforce site: http://www.geforce.com/drivers/results/46429.

If this doesn't fix your problem, I need more details about your horizontal lines problem, so I can try replicate the situation. What driver do you use, BIOS (hit F2 on bios start-up screen), and if it's choppy image in fast movement video or just the 1-2 pixels wide problem.

Note:
What i did see is that in fluorescent lightning conditions the flickering is seen better. I tweaked mine again to 67 Hz and it worked flawlessly. (ASUS, why do you still use the dubious Chi Mei screens)

ny2lond
08-18-2012, 10:30 PM
In the end, if you don't want to stick with older video drivers and you're not opposed to RMA'ing the notebook, I would highly recommend it.

Trust me, you don't want to RMA. I had a fried/dead bios Mother Board (so they've told me). After i got it home, I had to RMA it again as the touch pad would't work (defected connector strip. Couldn't wait more than 2 weeks because of my work) and the keyboard wouldn't light up and worse, sometimes the keyboard would't respond - not even light up the CapsLock LED (i had to restart my laptop to make it work, in some cases).

A defective driver is no reason to RMA it. Also, the flicker part is easy to repair by yourself.

Cheers from Romania :D

DaManWitDaPlan
08-18-2012, 11:01 PM
I changed my G74 for a G75 (the RMA ****ed mine up when it was in the 1st time, so i had to wait 2&1/2 weeks without my main workstation), so i can try and help you.
First of, install the beta drivers from Geforce site: http://www.geforce.com/drivers/results/46429.

If this doesn't fix your problem, I need more details about your horizontal lines problem, so I can try replicate the situation. What driver do you use, BIOS (hit F2 on bios start-up screen), and if it's choppy image in fast movement video or just the 1-2 pixels wide problem.

Note:
What i did see is that in fluorescent lightning conditions the flickering is seen better. I tweaked mine again to 67 Hz and it worked flawlessly. (ASUS, why do you still use the dubious Chi Mei screens)

Hi! I'm happy to see someone willing to help... lol

I do have the latest verde driver installed, 304.79. I also have a custom resolution set at 67 Hz (also tested 60 and 75). I never really noticed any flickering problem, just those 2 pixel high lines. Also, not sure what you mean by choppy images with video... I mean, I've noticed some screen-tearing with certain games, but that's normal for most computers lol. Although, I must say, a couple of days ago I was playing Team Fortress 2 and I noticed that the dark-grayish-brown background of the TF2 MVM menu was flickering just a little bit. HOWEVER, I can deal with that. That's not the issue I want to fix right now. My #1 concern are these damn lines that I can't ignore...

Here's my thread, which details the problem (and which 2 others are complaining about as well): http://rog.asus.com/forum/showthread.php?20249-Weird-faint-screen-lines-over-everything-on-G75WV-BBK5

I'm busy at the moment on this pc but when I restart I'll let you know what ver. my bios is. Thanks!!

ny2lond
08-19-2012, 03:59 PM
I responded on the other thread.

For the "flickerers", I hope Nvidia will create a 67Hz option for us, after the email I have sent them.
For the horizontal lines problem, please follow the other thread DaManWitDaPlan posted above.

da_nikon
02-15-2013, 07:18 AM
Sorry for digging this old thread, but i have a problem.


I'm a owner or G75VX since Monday. My panel is CMO1720 and i am experiencing the screen flickering issue. I have tried the custom refresh rate of 67Hz but with no/very little effect. I have tried also to max the brightness from the button combo and then to manipulate the picture from nVidia panel (brightness + contrast) but still getting flickering.

Please G75 owners, help me! The worse flickering i see is on this website http://livescore.com


Is there any recent nvidia drivers that fix this flickering issue or some new workaround this very annoying problem? :(


EDIT: im using latest nvidia drivers from nvidia website with modded ini file. 310.90 (and im on windows 7 64bit)

ny2lond
07-04-2013, 09:17 PM
Sorry for digging this old thread, but i have a problem.


I'm a owner or G75VX since Monday. My panel is CMO1720 and i am experiencing the screen flickering issue. I have tried the custom refresh rate of 67Hz but with no/very little effect. I have tried also to max the brightness from the button combo and then to manipulate the picture from nVidia panel (brightness + contrast) but still getting flickering.

Please G75 owners, help me! The worse flickering i see is on this website http://livescore.com


Is there any recent nvidia drivers that fix this flickering issue or some new workaround this very annoying problem? :(


EDIT: im using latest nvidia drivers from nvidia website with modded ini file. 310.90 (and im on windows 7 64bit)

Go here. These new settings will work better.

http://rog.asus.com/forum/showthread.php?28621-G75VX-screen-flickering&p=277566#post277566