820-00165-A Missing PM_SLP_S4_L

Soji

Member
board came in dead, Board was missing PP5V_S4RS3, PM_SLP_S4 was not present.
Triggered SMC_ONOFF_L, had Pulse on PM_SLP_S4_L, PM_PWRBTN_L went low, U1950/3 there was no pulse, U1950/5,7 there was pulse on it. I will need some further help here sir….
 

2informaticos

Administrator
Staff member
Check for pulse on all big coils.
If not detected, check diode mode to ground on corresponding coil.
Also test starting in SMC bypass mode.
 

Soji

Member
I only had pulse at L7520, L7630 and L7430, there was a stable voltage at L7560, the others there was no pulse at L7320, L7310, L3095 and L7701.
At SMC bypass, only L7560 had 3.3v others there was no signal on them, and there was a very slight fan spin.
 
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