820-2836

[andrespi]

any history? initially with a short C7516
now the computer gives video but with a white screen, activitie usb.Not video external.sometimes fan restarts constantly and it doesn't turn on.where would the problem be? in this moment computer doesn't turn on only fan restarts constantly

 

[2informaticos]

Did you mean 2936, instead of 2836?

Check R7402...

 

[andrespi]

R7402 =91k is good, board 820-2936

 

[2informaticos]

ALL_SYS_PWRGD comes on?

 

[andrespi]

ALL_SYS_PWRGD goes up and down to 3v as the fan restarts

 

[2informaticos]

Tried SMC bypass?

 

[andrespi]

yes, the problem persists, Veo que la placa tiene un poco de oxido en general, en los test point.Crees que un lavado ultrasonico pueda solucionar problema?

 

[2informaticos]

In such case, reball SMC first.
Any pulse at VCORE?
Just in case, remove Q7950.