Samsung Odyssey laptop random black screen

[BMCappelletti]

Hello, everyone. Samsung Odyssey laptop. Working fine until last night. Today it randomly black screens during use (LCD backlight still on) and fans stop spinning (sometimes they start spinning again). It happens on Windows, on Linux live environment, even on "no boot devices" screen when I boot without any disk. Happens with or without battery connected. With or without AC adapter connected. With or without keyboard, touchpad and other stuff disconnected. Really random. Any clue?
I was able to memtest it. No issues reported. Also, tried other RAM sticks, alternating RAM slots.
Replaced thermal compound, although it does not seem to be over heating.
When it happens, a long press on power button is needed to turn it off. Caps lock light does not turn on when laptop is on this state.

[BMCappelletti]

Re: Samsung Odyssey laptop random black screen

Bump.

[mon2]

Re: Samsung Odyssey laptop random black screen

First, try this:

https://www.youtube.com/watch?v=-Nui5B2CdKE

Upon first power on - do you see any text / vendor logo / memory count, etc. ?

You may have a damaged video cable from the logic board to the display if you do not. This is assuming that you did not have liquid damage on this logic board.

If you have no video, how can you metest it? (Tested when you had video?)

If you remove ALL ram, does the unit complain with some beeping code?

[BMCappelletti]

Re: Samsung Odyssey laptop random black screen

When I hit power button one of two things happen:
1 - it only spin the fans, then stops; or
2 - it boots just fine and after some usage it black screens.

So I managed to memtest it. I also did reinstall Windows and did all updates. Run Youtube videos for hours. Then, suddenly, it black screens.
Sometimes I can use it for some hours and turn it off, then I cannot turn it on again.

BIOS was already reflashed.
Some people on Discord told me it could be the dedicated GPU.
I dunno what to test right now.

[mon2]

Re: Samsung Odyssey laptop random black screen

If it is the dedicated GPU, someone may have details on how to disable it. Personally do not have the experience.

Boot into safe mode with networking -> does the unit run ok (VGA mode) ? Test with youtube videos running overnight or similar stress test.

Also, when the screen goes dark, do you still have audio / video streaming (without a display) playing like normal?

[BMCappelletti]

Re: Samsung Odyssey laptop random black screen

No. When the screen goes black (sometimes backlight on, sometimes off) I cannot do anything.
It also happens on BIOS screen or Linux live diks.