Acer 5236/5536 BIOS issue?

[Spider1211]

Hey guys, grateful if anyone can provide known good dump for acer 5236/5536

Motherboard: 08252-2. jv50-pu mb 48.4ch01.021

Laptop issue: When power button is pressed, fans ramps to maximum power with no display and boards cut off after about 10-15seconds (sometimes it goes up to 20seconds).

Power draw @19.7V:
Idle: 20mA
On: 1.028A

All power rails are present and stable when turned on.

No shorts found on board and stable 32KHz and 25MHz clock observed.

Tried different RAM with no luck.

Tried BIOS file obtained from: https://www.badcaps.net/forum/showthread.php?t=59082 but issue is still the same.

Please find attached original BIOS dump.

[piernov]

Re: Acer 5236/5536 BIOS issue?

Make sure you are using a compatible CPU (different generation of S1 socket are not compatible), could also be a dead northbridge or GPU.

[Spider1211]

Re: Acer 5236/5536 BIOS issue?

Motherboard in non GPU Version. As far as I know, CPU has not been touched and is the same one as originally supplied with motherboard.

Laptop came in and had obvious signs it had been worked on by someone else. Besides some pretty bad soldering job (which has already been corrected).

I doubt i'll be going as far as troubleshooting northbridge (if as suggested could be potentially the case here).

Having a known good BIOS would have been an easy test before deciding if its worth digging deeper. I might try replacing the CPU with a compatible one as you suggested if I have one lying around.

[resistor83]

Re: Acer 5236/5536 BIOS issue?

hello all, i also have a black screen problem on the 5536 model, i have already tried the reflow both on the northbridge and on the southbridge but nothing.
I wanted to try to flash the bios but with my TL866 I have problems flashing.

In reads I have to uncheck "verify id" otherwise it won't read me anything.
When I go to program instead it gives me this:

[lapfix]

Re: Acer 5236/5536 BIOS issue?

Clean bios pad and try again

[resistor83]

Re: Acer 5236/5536 BIOS issue?

yes I have already tried, I have also tried to change chips taken from another motherboard always the same

[lapfix]

Re: Acer 5236/5536 BIOS issue?

Try disable verify after

[resistor83]

Re: Acer 5236/5536 BIOS issue?

thank you, now its work!