View Full Version : ASUS G74/G75 Screen Problems

05-06-2012, 01:03 AM
Hello all.

Sorry if I am beating a dead horse here but I figured I'd share my experience with my purchase. I originally bought a G74 back in March and noticed that anytime there was a difference of brightness/contrast in a pc game or video; there would be horizontal lines in a striped pattern. I found this to be very annoying but in the end I decided it wasn't too big of a deal. 45 Days later on the dot the G75 was released so I turned in my G74 for a G75 model which was exciting. I turn the unit on, fire up one of my games and BAM the same exact issue. I noticed the G74 has a glossy screen and the G75 has a matte screen. So I guess it's safe to assume that maybe it's the LED technology causing this? Because it's two different video chipsets and motherboards as far as I know. I'm sure I am not the only one who has experienced this issues. Anyone got any suggestions or tips to fix this issue or is there even a fix for this or am I being picky? Thanks guys! Looking forward to hearing from the experts.;)

05-06-2012, 03:00 AM
No worries. @UsedBlueCrayOn! There's not a whole lot else you can do to a dead horse anyway... Tacos maybe?

http://rog.asus.com/forum/showthread.php?5536-Asus-G74-screen-flicker-(dark-backgrounds-and-low-brightness) is the main thread on this issue.

http://rog.asus.com/forum/showthread.php?12720-Has-anyone-tried-the-new-NVIDIA-301.24-beta-drivers-on-their-G-series-notebook/page2 discusses this issue more from a video driver perspective. If you follow the official feedback threads for specific driver version releases on the NVIDIA Forum, you'll see it is a commonly reported issue in games.

I'm not an expert, but as I see it, there appear to be 2 different issues with similar symptoms. If you observe flickering in all dark backgrounds at low brightness levels on the screen, including this forum, you are probably experiencing the pulse width modulation issue discussed. If you see it only in games and videos, it could be an NVIDIA driver issue.

Attach your laptop to an LCD TV and see if the issue also appears on that external monitor. If it does, it could be a driver issue.

However, you can't rule out some sort of electrical short. I've read one post where the user reported horizontal lines disappeared when he touched the heat sink of his open laptop. Another user resolved his issue by accidentally slamming his laptop lid. So grab your hammer and have at it... Jest kiddin

I think its worthwhile troubleshooting by installing NVIDIA 285.62 using a "clean install" to remove your current version.

05-23-2012, 02:51 PM
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 66 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 66 Hz with 32-bit Colour depth and hit apply.

If it doesn't work and 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_detailed2.php?id=4944&cat=scenes#.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 33Hz. As the display has a 60 Hz refresh rate, that makes a 6 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. That has a screw-like cap and by doing some tests, you could calibrate it.