820-3476 no power

Kyle93

Member
Arrived working but track pad was not functioning. Replaced trackpad with known good one and still was not working. After changing R808 board somehow died. Now PM
_SLP_S4_L and ALL_SYS_PWRGD are missing

PPBUS_G3H 12.60v

All 4 RTC signals are present.

while triggering SMC_ON_OFF_L

PM_PWRBTN_L drops to 0.34v

PM_SLP_S5_L no pulse

PM_SLP_S4_L pulses to 0.285v

PM_SLP_S3_L pulses to 1.6V

PM_SLP_S0_L constant present 1.9v no SMC_ON_OFF_L trigger needed

What next?
 

Kyle93

Member
yes and with R4808 removed board still does not start.

Same with SMC bypass mode
 
Last edited:

2informaticos

Administrator
Staff member
Check for short on all big coils.
You should get pulse on them, if PM_SLP_S4/3_L are pulsing (at same time).
 
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