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820-00165: Fan spins, stops then starts but board won't boot

M

macRepairAmb

Member
Originally the board was dead which i isolated to the smc. Once replaced, the fan would spin for like 12 seconds, stop and then start spinning and stays spinning but no board activity, no usb activity either. I did noticed the bluetooth module was getting very hot so removed it but the board still doesn't boot up. I

intruder_l - 3.0v
All_sys_PWDGD - 3.3
PPVCC_S0_CPU_PH1 - 1.8v

Any suggestions
 
2informaticos

2informaticos

Administrator
Staff member
Check CPU_VCCST_PWRGD and CPU_VR_READY.
Do you get all voltages from page 11?
Must also check all SPI Bus Series Termination resistors and their traces.
Q5150 and its adjacent resistors is other point of interest.

Heat PCH/CPU for test as last resource.
 
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