820-3115 no post

Gmorb

New member
Macbook had water damage retraced some areas reflowed smc and got it working but had no backlight. After working in backlight for a bit i realized the machine stopped posting.

ppvcore cpu is 1.1v

not sure what happened but last thing i did was replace the led driver thats when it stopped booting

i get no sound with or without ram so it could be cpu isnt engaging?

i checked u7400 area ton resistors are fine and traces are good even replaced u7400 and no luck.
 

Gmorb

New member
I figured that be it too but i noticed on other machines when its a bios issue the machine will do quarter fan spins not constantly fan spin. I will try replacing tho.
 

2informaticos

Moderator
Staff member
Reflow PCH too, with good flux.
You still have some issue generated by corrosion...
BTW, did you place U9701 correctly?
 

Gmorb

New member
Good flux would be amtech right. Also how long should i heat it for. Im using my quick to reflow
 

2informaticos

Moderator
Staff member
30s should be good enough, no more than 200 degrees.
Only need to burn ecentually crap, not to melt the balls.
 

2informaticos

Moderator
Staff member
I still suppose to have an issue generated by corrosion.
Maybe RAM slots with problems, or some traces in the board.
Did you try new BIOS with clean ME, just in case?
 
Top