820-3023 All_SYS LOW.

Ryanlen2

Member
820-3023 All_SYS is low on this board. no liquid history. No pulse on PPVCORE.

Replaced Q7950 and checked surrounding resistors value.

Checked R793, R7964, R7901, R7965, R7966, R7967 values.

Replaced U7100

Replaced U7400

ALL_SYS is 0.75V


Thanks.
 

2informaticos

Administrator
Staff member
Any S3 voltage present?
Do you get at least a pulse on S3 and S0 coils?
Check that triggering SMC_ONOFF_L signal.
ALL_SYS_PWRGD requires PM_SLP_S3_L presence.
 

Ryanlen2

Member
Hi and thanks.

I forgot to mention sorry.

S3 rails present
S0 rails present

To your question.

SMC_ONOFF_L 3.4V
PM_SLP_S3_L


ALL_SYS_PWRGOOD - .0.074V

Thanks again!
 

2informaticos

Administrator
Staff member
First be sure to have 3V at pin 1 of R7967.
If yes, remove Q7950 and test again ALL_SYS_PWRGD.
If still low, remove R7963-66, one by one, until signal goes high; don't forget R7901 too.
 
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