820 3115 missing PP5V_S3

EJS

New member
820 3115 missing PP5V_S3, and quarter fan spin. Cant find any shorts, I replaced u2600, no change.
 

JohnB8812

New member
Resistance between pins 17/18 and 27/28 of the ISL? Corrosion near BIOS possibly corroded probe points? PP5v_S3 is definitely not shorted to ground?
 

EJS

New member
I got it working now, this machine has an EFI swap done on it at some point in the past. The solder joints looked so/so, I pulled the chip and resoldered it. The machine boots now. Thanks John
 

2informaticos

Administrator
Staff member
Quarter fan spin means PP5V_S3 is pulsing at least.
The fan requires 5V_S0 to spin.
So your board tries to enter S0 even...

Look if all big coils pulse.
ALL_SYS_PWRGD pulsing too?

I hope PPBUS_G3H and 3V3_S5 are stable; you didn't mention them.
 

EJS

New member
2info, I got it solved, it was a poorly soldered SPI ROM, done by some one previously. Thank you
 
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