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View Full Version : Issue with G751JY (flipping between AC/Battery)



Phishd
10-14-2017, 06:59 AM
I'm sorry if this has been posted before but i couldn't find an appropriate thread, or i couldn't seem to get the right search terms. I've had my G751JY since around March of 2016 and i have been noticing an odd issue. As of about a week ago the laptop will flip between AC and Battery power(as if I am plugging and unplugging my laptop), it seems to be only games that are more intensive on my graphics card or with periods of use for a long time. I can run 2d games, or light 3d games very well, but I cant even play Rocket League without it happening. It also seems that my AC input and plug(the plug that goes into the laptop) get hot , although that might just be me noticing it more because I'm paying more attention to my plug now. Again this only happens when i play 3d intensive games, and its really getting on my nerves.

Clintlgm
10-14-2017, 01:10 PM
Yes under heavy loads your notebook demands power from both AC and your battery This is normal

haihane
10-14-2017, 01:39 PM
Yes under heavy loads your notebook demands power from both AC and your battery This is normal

wasn't there major issue(s) with GL502VS (63 pages now) because consumers were pissed this happened?

not that there's anything wrong with what you said; but, from a user perspective, if i plug the plug in, i expect it to not slowly kill my battery.

Clintlgm
10-14-2017, 02:32 PM
Yes at times things are what they are we just work around them. Also if you unplug your CPU and GPU with throttle down to power level present. These have been known for some times since the G751, I don't remember the issue with the G750 or G75. Compromises are made to get these powerful CPU and GPU to work in such a small crowded format as a notebook computer.

haihane
10-14-2017, 02:58 PM
i really want to believe you, that it's something that can't be avoided. :/

honest question: can't this thing be solved with a bigger powersupply brick out of the factory?

Clintlgm
10-14-2017, 03:11 PM
I have no Idea haihane, I don't play games so I haven't every actually seen the issue, just know about it from reading this forum. I personally stay plugged on all the time Desktop replacement. I pack up and move from job to job but once I'm on a project I stay plugged in My G75VW lasted me nearly 5 years on the same battery it was still working as a UPS when I handed it over to a family member whom continues using it today. I'm almost a year now with this G752VY, I guess it will raise it ugly head right after my 2 year warranty runs out.

haihane
10-14-2017, 03:38 PM
i like your answer, i can feel honesty in it. thanks.

Clintlgm
10-14-2017, 03:53 PM
Well were all here to learn and try to help each other out

Phishd
10-14-2017, 08:46 PM
But i never had this issue previously. It just started happening in the past week. I dont understand how, games i played previously can just suddenly start causing the laptop to flip between AC and Battery power. It causes a massive drop in my FPS due to the laptop throttling the cpu and gpu down(even when on high performance mode) and is really hindering my ability to use this gaming laptop to play games.

Sanctrum
10-14-2017, 08:54 PM
I have G751JY too and I have never noticed what are you writing. Including the hot plug – never observed. I used to play The Witcher 3, Call of Duty Infinite War, Titanfall 2… for 2-3 hours per session and it is always ok.
Looks like your power brick is defective (or battery, or some”shortcut”). I would count on the power brick. Maybe just the power cord is defective, the one with the plug… Someone maybe bent it too much or stepped/pressed it with some chair leg? Or similar? That would explain the hot plug. So it looks like your rig does not receive enough power the time it is needed = during playing heavy GPU/CPU tasks… so rig simply switches to the battery supply.
Try to borrow some other power brick and test…

Phishd
10-14-2017, 09:40 PM
Yes, i am in the processes of sourcing a power brick to test with now. Hopefully that is just the issue, i would hate for it to be an issue with the AC socket on the computer or something similar.

Clintlgm
10-15-2017, 05:36 PM
Sure anyone with a Multi meter can check out your power brick, any computer or electronics shop would check it for free or very little charge. Another thing to check, it the green light on the brick remaining light up when the power fails and your battery takes over?

haihane
10-15-2017, 10:13 PM
Sure anyone with a Multi meter can check out your power brick, any computer or electronics shop would check it for free or very little charge. Another thing to check, it the green light on the brick remaining light up when the power fails and your battery takes over?

you mean: using the multimeter and stick one into the powerbrick plug, and the other touching the outer metal part to test voltage?
nice.

(hadn't thought of that until you mentioned it).

let's see, my basic electricity lesson. uhhh... (these things output DC power right?)
i'm taking my own powerbrick as guinea pig
P = V.I

if V = 19.5 V
and I = 7.7 A
P = 150.15 W (powerbrick says 150 w output. this checks out)

i don't have my digital multimeter with me (left it at office). if i want to make sure the powerbrick outputs power as it should:
a. first test Voltage reading, it should be 19.5 V
b. how do you test out Amperage or Watt?

P.S.: i don't remember the all knobs on the multimeter. i only remember there's the Voltage testing knob. is there a knob for Amp or watt testing?

Clintlgm
10-15-2017, 11:09 PM
I found this (https://www.wikihow.com/Measure-Amperage)
I would think that if the AC adapter is putting out the correct Voltage and Amp it should be ok, I would also be moving wire around too looking for a short or brake near the connectors trying to duplicate the AC adapter failing.

ufotheswe
10-24-2017, 01:14 AM
I am having the same problem. The laptop worked fine for one year, but all of a sudden this started to happen.

Did you try to play one of those games on the battery alone, and see what happens? If my assumptions are correct, the laptop will turn itself off.

My whole story: One day i turned on the laptop and the battery was dead, 0% wouldnt charge. Every time i loaded a high demanding game the laptop would shut off. I bought a new battery, so now it normally doesnt shut off, but it does flip between battery and AC when I am playing games. Its very, very annoying and it shouldnt be like that.

I just opened the laptop today and cleaned the fans again (did it when i replaced the battery). Nothing, still the same problem.

Hope we can solve this because its more or less a browsing machine now.

OnePiece@ASUS
10-24-2017, 08:33 AM
I am having the same problem. The laptop worked fine for one year, but all of a sudden this started to happen.

Did you try to play one of those games on the battery alone, and see what happens? If my assumptions are correct, the laptop will turn itself off.

My whole story: One day i turned on the laptop and the battery was dead, 0% wouldnt charge. Every time i loaded a high demanding game the laptop would shut off. I bought a new battery, so now it normally doesnt shut off, but it does flip between battery and AC when I am playing games. Its very, very annoying and it shouldnt be like that.

I just opened the laptop today and cleaned the fans again (did it when i replaced the battery). Nothing, still the same problem.

Hope we can solve this because its more or less a browsing machine now.

I would suggest you to take your product to our local service center for comprehensive inspection and help you to fix the problem. Sorry for the trouble.
The following is the contact information:
http://www.asus.com/support/Service-Center-All-Countries/

Also you can contact the local service center for help. The following is the contact information:
http://www.asus.com/support/CallUs#

ufotheswe
10-24-2017, 04:29 PM
I would suggest you to take your product to our local service center for comprehensive inspection and help you to fix the problem. Sorry for the trouble.
The following is the contact information:
http://www.asus.com/support/Service-Center-All-Countries/

Also you can contact the local service center for help. The following is the contact information:
http://www.asus.com/support/CallUs#

Thank you for your reply but I am living in a country where the "global" warranty doesnt apply (Brazil), so I am stuck to try to fix the problem myself.