ROG G751JL Display problem, randomly stops working for a second then back to normal?

[watzuuuup]

Hello everyone!

Like all folks here on the forum i'm a proud owner of a ROG gaming system, precisely G751JL. It's been in my possesion for like 4 months, but after 2 months a wierd problem appeared out of nowhere. So here it goes:
While watching videos, working on CAD software and especially gaming, the display stops working for like a second then all goes back to normal. This occurs extremly random, like one black screen per day or multiple ones in a aprox. one hour or even 30 min interval, while the application/video/game is still running in the background (the sound still plays in a normal way). No errors are displayed after the black screen. The notebook is allways connected to the power source.
I tried all the fixes i could think of: reinstalled the video drivers after a clean uninstall using DDU while in safe mode, used many earlyer version of drivers in the quest to find one that is stable but no luck, tweaked 3D settings in NVIDIA control panel, reinstalled windows (currently running windows 8.1), upgraded BIOS from v. 204 to v. 205, all of this with no luck.

So, if anyone experienced this situation, and may have found a solution, preety please share it to a fellow republican of gaming.
Any suggestion is apreciated.

Thanks!

[watzuuuup]

Thanks for your answer nemerdekel! I've managed to overclock my monitor and have set the refresh rate to 75hz. I was anxious to see if this might solve my problem. It didnt... And i've done the overclocking after a fresh, clean install of the latest drivers.

As for the undervolting of my CPU, I will take your advice and stay out of this for now since I dont have experience in under/over clocking...

One more possible solution crossed my mind today surfing the web. How about updating my GPU bios? Is it worth it? Can it be done on this particular GPU (gtx965 m)?

[nemerdekel]

Changing the vBios is worse than (more dangerous) undervolting, so I would try that one first
In XTU: - Core Voltage Offset -75mV
- Cache Voltage Offset -50mV
These values should be pretty safe as I'm running -90 on the core and -100 on cache without problems

Make sure that you go - (negative) positive voltage could damage your CPU

[watzuuuup]

I think i may have found a solution to the black screen problem. It's not a perfectly good one but I reduced the black screen frequency to aprox. 2 black screens per day of use. Wierd!

Under advanced power options, for the high performance plan, at processor power management, i've set the maximum processor state from 100% to 95% for both "on battery" and "plugged in".
After doing so, the display is easyly more stable and it made me wonder about your suggestion Nemerdekel, undervolting the CPU. The question really is, what connection has the processor with the rendering of the display, since i've heard that Intel HD graphics are permanently disabled on this notebook.

[nemerdekel]

Mine stopped doing it, so I would say it has something with the cpu and the undervolting pretty much fixed it

[watzuuuup]

Ok, after almost 2 weeks of testing, i figured it out or so it seems. Using XTU utility, i've set the core voltage offset to -80 mv and the cache voltage offset to -75 mv. In these past days since i've used this settings, i've only encountered one or maybe 2 black screens. So basically, the problem is ALMOST solved.

Can anyone please explain what does the voltage of the CPU has to do with rendering images on the display since all that work is done by the GPU. Maybe i'm missing something or I dont have that kind of deep knoledge about computer internals.

[nemerdekel]

I can confirm this solved my problem too, no black screen for almost a month

[b0xBR]

Hello!

I'm having a similar issue. I have a G751JT-DH72, which every 2-3 days, it simply freezes the video and sometimes the audio keeps running and sometimes freezes completely.
I was undevolting with XTU only the CORE VOLTAGE OFFSET to -50mV and randomly crashed. Then, I let it to default settings and it also crashed in the same way. Sometimes it freezes when I'm watching videos on Youtube, today froze when I was playing CS GO.
I always suspend the device, maybe this can be the problem. My question is, if using a modded VBios, could solve my problem?

Thanks in advance.

edit: I did a vbios mod procedure and everything is running properly. I hope this fix my problem.

[nemerdekel]

b0xBR wrote:
Hello!

I'm having a similar issue. I have a G751JT-DH72, which every 2-3 days, it simply freezes the video and sometimes the audio keeps running and sometimes freezes completely.
I was undevolting with XTU only the CORE VOLTAGE OFFSET to -50mV and randomly crashed. Then, I let it to default settings and it also crashed in the same way. Sometimes it freezes when I'm watching videos on Youtube, today froze when I was playing CS GO.
I always suspend the device, maybe this can be the problem. My question is, if using a modded VBios, could solve my problem?

Thanks in advance.

edit: I did a vbios mod procedure and everything is running properly. I hope this fix my problem.

The only way to find out is to test it. I also want to know if changing the VBIOS did fix the problem or the - voltage on cpu

[b0xBR]

nemerdekel wrote:
The only way to find out is to test it. I also want to know if changing the VBIOS did fix the problem or the - voltage on cpu

I'm testing right now and I'll let you know if I had success or not. 🙂

[b0xBR]

nemerdekel wrote:
The only way to find out is to test it. I also want to know if changing the VBIOS did fix the problem or the - voltage on cpu

So far, no problems detected. I did a VBios update + undervolt (Core + Cache) and everything is running properly.