820-3435 - long quarter fan spin and CPU Vcore pulses

Alan.L

Member
hi 2informaticos

do you have clean me bios for this board, i couldn't find it anywhere else.

spi terminal resistors are all good.

The 25k MHz clock signal is there.


hopefully isn't smc or CPU problem.
 

Alan.L

Member
thank you 2informaticos. the board still doing the same problem

sometime will boot and most of the time doing long quarter fan spin and CPU Vcore pulses.

the board looks very clean. can it be bad SMC or CPU?
 

2informaticos

Administrator
Staff member
Run ASD EFI when possible.
Also try starting in SMC bypass mode.
If suspect liquid damage, reball SMC or reflow it at least.
 
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