820-3115 Quarter Fan Spin

brunomotter

Member
Hello guys. Got an 820-3115 with quarter fan here. As I'm not familiar with this symptom I'm stuck. Got steady PPBUS_G3H, steady PP3V42_G3H, pulsing DDR Voltage and pulsing PCH VCORE, no pulsing on CPU VCORE though. Replaced RTC chip just in case, still same. Steady 3.3V on PPVRTC. There was a little bit of corrosion near J5100, which I cleaned. Still same. Where should I start?
 

2informaticos

Administrator
Staff member
Check all SPI Bus Series Termination resistres and their traces.
If all good, try known good BIOS.

Don't forget to check R7402/03.
Also try to start in SMC bypass mode.
 

brunomotter

Member
Machine does not start in SMC bypass. R7402/03 ok. Flashed BIOS, same. Verified all termination resistors and all read OK.
 
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