820-3476 ALL_SYS_PWRGD 0V

No-Clean

Member
Clean board, I get USB light but no activity.

SMC bypass same thing.

Clean BIOS same thing.

Already replaced U7501, U7600, U7200, Q8150 and U1930, all resistors around Q8150 are fine, U1950 looks clean.

ppbus 12.6V
pp5vs5 5V
pp5vs4 5V
PPVRTC_G3H 3V
PP5V_S0 5V
PP3V3_S5 3.3V
PP3V3_S4 3.3V
PP3V3_SUS 3.3V
PP3V3_S3 3.3V
PP3V3_S0 3.3V
PP5V_S0_FET 5V
PP3V3_S0_FET 3.3V
PP1V35_S3 0V
PP1V05_SUS 1.05V
PP1V5_S0 1.5V
PP1V05_S0 1V
PPVCC_S0_CPU 0.034V
ALL_SYS_PWRGD 0.059V
 

2informaticos

Administrator
Staff member
Remove Q8150 and test again.
If still low, remove PGOOD resistors R8164-69, one by one, until ALL_SYS_PWRGD goes high.
Keep in place R8167.
 

No-Clean

Member
Removed Q8150 same thing.
Removed R8164 same
Removed R8165 same
Removed R8168 ALL_SYS_PWRGD goes high
R8168 measures fine 100ohms
Replaced U7400, reinstalled all components and ALL_SYS_PWRGD is now 3.3V vcore is 1.8V but no boot still and board gets stuck at 0.092a
 
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