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G751JY AC charger disconnects while gaming.

KSHORNTV

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#1
So a few months ago my battery died, which in turn made my computer turn off while gaming. It seemed that the computer (GPU?) needed more power than the AC could give causing it to shut down.

So I got a new battery, and everything worked fine for a week or two. Now when I play demanding games like PUBG the AC charger disconnects and reconnects frequently, and sometimes the computer shuts down. GPU-Z logs say that the temperature is not above 80' degrees just before the shut downs, which leads me to believe its a problem with energy consumption.

The computer is an ASUS ROG G751JY with Nvidia 980m. The AC part is original, and the seller said the battery is original too (and it looks identical to the original).

Other things to note is that during gaming the right side of the laptop is significantly warmer than the left side. The right side is where the AC intake is. The AC jack (?) is also pretty warm when gaming.

Again the disconnections and shut-downs only happens during demanding games. Never during browsing. Stress tests with FurMark will sometimes shut my computer off immediately, other times just disconnects and reconnects of the AC charger.

I am attaching some photos from a gaming session, with information form HWiNFO64 and GPU-z. The last picture is taken just as the charger disconnects and reconnects.

https://imgur.com/a/pgjnY

If I understand correctly my AC charger has 220 watt (19,5 V x 11,8 A), so I don't understand why its disconnecting. I thought maybe I could try to undervolt the GPU, but I dint find a program that could do it. The volt option in Afterburner is already at minimum it seems. I can only overvolt?

Regards
 

eidairaman1

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#2
You are overheating. Clean the unit out really good. Of dust.

if you have the disassembly manual, follow it carefully and apply thermalcompound to the cpu and if it has a separate gpu, that too.

You have have a bad power jack solder joint in the laptop motherboard.

Bad power circuit in the residence, bad power cord/brick/battery.

Easiest solution for you would to find a reputable shop for repairs.
 

KSHORNTV

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#3
Thanks alot for the reply @eidairaman1 - that is alot of good tips. I was just inside the laptop when I changed the battery, so its clean but I can look into applying new paste.

You think I would be able to fix the power jack solder joint?

What do you mean when you say bad power circuit in the residence?

I wouldnt trust the shops around me with my laptop, but maybe I have no choice.

Again, thanks alot for the reply.
 

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#4
Depending on your residential home wiring standards for your country you should have a box outside with a breaker next to a power meter there lines that run from that into the room where you're plugging in your laptop to that's your Source power if your Source power is not good things don't work correctly at times
 

KSHORNTV

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#5
Ah, I understand now. I have the same issue in different neighbourhoods so I was ruling this one out, but we never know.
 

eidairaman1

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KSHORNTV

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#7
Update: When I run Furmark now, every time the laptop shuts down immediately when starting the stress-test. So its definitely not a problem with heat, and probably a faulty PSU problem :(
 

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#8
Update: When I run Furmark now, every time the laptop shuts down immediately when starting the stress-test. So its definitely not a problem with heat, and probably a faulty PSU problem :(
Yeah, it seems your powerbrick may not be original for this specific laptop afterall since it wants to draw more power than it can deliver.
I have an Asus gaming laptop as well, bought it new, never had these problems.
 

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#9
Some power bricks are under rated for the laptops. A buddy bought a cyber power "Gaming" laptop and it would do this constantly. He ended up ordering a universal high amperage power brick and wired it with the original bricks plug and never had a single issue after that.
 
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#10
So a few months ago my battery died, which in turn made my computer turn off while gaming. It seemed that the computer (GPU?) needed more power than the AC could give causing it to shut down.
Not likely unless the problem started from day 1.

Some power bricks are under rated for the laptops. A buddy bought a cyber power "Gaming" laptop and it would do this constantly. He ended up ordering a universal high amperage power brick and wired it with the original bricks plug and never had a single issue after that.
This is highly unusual - and frankly, not likely (at least not with any name-brand notebook) - assuming everything (power supply, battery and notebooks charging circuits) was in perfect running condition and not faulty in some way.

A notebook's power supply should comfortably (without overheating or shutting down) not only support the requirements of the notebook while performing demanding tasks (including heavy gaming) but also charge a deeply discharged battery at the same time.
 

brandonwh64

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#11
Not likely unless the problem started from day 1.

This is highly unusual - and frankly, not likely (at least not with any name-brand notebook) - assuming everything (power supply, battery and notebooks charging circuits) was in perfect running condition and not faulty in some way.

A notebook's power supply should comfortably (without overheating or shutting down) not only support the requirements of the notebook while performing demanding tasks (including heavy gaming) but also charge a deeply discharged battery at the same time.
Cheap "Gaming" laptops are what I am talking about. The PSU's are some no name china brand that struggles to handle the load of the laptop during peak performance. I don't see how you cannot understand that some of these companys would cheap out on item like this? Dell does this all the time with their XPS desktops that are geared toward gaming. We tore into a new one at work and the PSU was like a 400W generic style PSU and was not even 80+ rated running a I7 6700 GTX 1070
 

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#12
I bought the computer used, it was 5-6 months old. But it worked flawless until the battery died last month - it never had these PSU disconnects before the problems with the battery.

So, if the seller sold me an unoriginal PSU it did work for one year though. It looks like the original ones when i google for them, and its very heavy ;D
 
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#13
I don't see how you cannot understand that some of these companys would cheap out on item like this? Dell does this all the time with their XPS desktops that are geared toward gaming.
First off, I never said I didn't understand. I said it is "unusual", not impossible or that it never happened. Second, there is a big difference between notebook and PC PSUs so you cannot compare. Third, IMO there is no such thing as a good "gaming" notebook. Makers can pack the power of a PC into a tiny notebook case, but not the cooling. And if you consider even good mid and full tower cases are challenged to keep the innards properly cooled, it is no wonder notebook cases cannot.

But this is about power, not cooling and as a tech, I stand by what I said. The power supply that comes with any notebook (cheap or otherwise) "should" support the notebook while tasked and charge the battery too.
 

KSHORNTV

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#14
Yeah, it did support the notebook. And it supports the notebook of my friend who has the same excact model. So I guess have to guess that its the PSU that has some problems and it needs a replacement?
 
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#15
I'll look up the brand I got when my OEM laptop charger died. Took a huge OC like a champ directly off the power brick and was way over the watt limit the laptop manufacturer specified.

I like overclocking laptops.

EDIT: AcBel is the brand I got and it's been solid for the two years I've had it. Mind it handled a 100% overclock if that says anything.
 
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brandonwh64

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#16
First off, I never said I didn't understand. I said it is "unusual", not impossible or that it never happened. Second, there is a big difference between notebook and PC PSUs so you cannot compare. Third, IMO there is no such thing as a good "gaming" notebook. Makers can pack the power of a PC into a tiny notebook case, but not the cooling. And if you consider even good mid and full tower cases are challenged to keep the innards properly cooled, it is no wonder notebook cases cannot.

But this is about power, not cooling and as a tech, I stand by what I said. The power supply that comes with any notebook (cheap or otherwise) "should" support the notebook while tasked and charge the battery too.
Have you seen some of the newer laptops that feature the 10xx series Nvidia cards? They are within 5% of their desktop counterparts. I have a MSI GT62VR Pro-Dominator87 with the I7 6700 and GTX 1070. It plays at almost the same level as my desktop does with a I7-6700K and a GTX 1070 (before I changed to a 1080ti). Gaming laptop are becoming more powerful that the older style that feature mobile GPU's
 

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#17
One more thought. I just tested fumark with only the battery, and the laptop shut down after 2 seconds. So how can the PSU be the problem when the same thing happens with just the battery?

I wish I found a way to undervolt the GPU.

Thanks @Toothless I'll look into that
 
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#18
Yeah, it did support the notebook. And it supports the notebook of my friend who has the same excact model. So I guess have to guess that its the PSU that has some problems
If that power supply previously supported the notebook and it currently supports your friends "exact same" notebook, how can you conclude or "guess" it is bad?
So how can the PSU be the problem when the same thing happens with just the battery?
And how can it be the PSU when it works fine your friends exact model?
Have you seen some of the newer laptops that feature the 10xx series Nvidia cards? They are within 5% of their desktop counterparts. Gaming laptop are becoming more powerful that the older style that feature mobile GPU's
:( Gee whiz, dude! I clearly said, "Makers can pack the power of a PC into a tiny notebook case, but not the cooling."
 

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#19
I thought the PSU was the problem. I thought it have gone bad after time - but since the same happens with the battery, I dont know anymore.

To be clear I never tried my PSU on my friends laptop. But he has the same exact looking PSU.
 
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#20
But he has the same exact looking PSU.
You cannot go by looks. The output voltage must be the same. The output current must be the same or greater - not less. And the connector not only must be the same, but the polarity (+ and - ) must also be the same.
 

KSHORNTV

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True. I live in a different country than him now so I cant test. I will try to get my hands on a measuring device to see the output. But dont you agree its weird that the same thing happens on the battery?
 
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#22
But dont you agree its weird that the same thing happens on the battery?
Weird? No. This could still suggest a heat problem, or a component failure within the notebook.

Note you cannot conclusively test a power supply just by measuring its output. The supply (whether a power supply or battery) must be tested while under a variety of realistic loads.
 
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#23
You can still run normal programs like internet explorer or any internet browser without shutting down on battery power.

When it shuts down, does it blue screen or just shut down.
 

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Yes @yotano211 I can run normal programs, browse, watch movies, probably play a little (didnt try)

No blue screen, just instant shut down. (not reboot)
 
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#25
Yes @yotano211 I can run normal programs, browse, watch movies, probably play a little (didnt try)

No blue screen, just instant shut down. (not reboot)
When you replaced the battery was it a Chinese battery that fits or the real name brand battery.
 
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