820-00840-A

paky

Member
Hi, I have a problem with this board. when I turn on the fan starts and nothing happens, the cpu gets a little hot and I have
PPVCCGT_S0G
PPVCCCPU_S0G
PPVCCSA_S0G which are shorted
 

2informaticos

Administrator
Staff member
Probably no short at all.
CPU power rails have very low resistance as normal; just compare with good board.

Do you get any voltage at PPVCCCPU_S0G ?
 

2informaticos

Administrator
Staff member
That is good value.
Check if you have USB activity.
Caps Lock LED reacts?

Any history fault available?
 

paky

Member
No green light
The mac has been in apple assistance several times
They changed motherboard hd keyboard. The customer told me that sometimes the folder with the question mark appears
 

2informaticos

Administrator
Staff member
When board boots, PPVCCCPU_S0G pass through 0.9V till 0.6V in the first 10s.
Check if is your case.
Did you try PRAM reset?
 

paky

Member
0.9 always
First the folder appeared
 

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