820-3462 no PP5V_SUS

BCN_Techs

Member
Hi!


I have this PCB without traces of humidity but it does't turn on:

- PP5V_SUS: 0V (not short)

Greetings and thanks.
 

2informaticos

Administrator
Staff member
Missing PM_SLP_SUS_L too?
Confirm that.

Check SMC_BATLOW_L.
Be sure to use original 60/85W Magsafe 2 charger.
 

BCN_Techs

Member
PCH_DSWVRMEN = 3.23V
PM_DSW_PWRGD = 0.00V
RTC_RESET_L = 3.33V
PCH_SRTCRST_L = 3.33V
PCH_INTRUDER_L = 3.07V
PCH_INTVRMEN_L = 3.25V
PPVRTC_G3_PCH = 3.34V
 

2informaticos

Administrator
Staff member
"What about S5_PWRGD?"
It is on R7941.

I said to check R5092 for other reason; it controls SMC_S5_PWRGD_VIN.
 

2informaticos

Administrator
Staff member
Remove resistor and check its ohm value.
If 3V3_S5 (L7260) is present, then pin 2 of R7941 MUST go high.
 

2informaticos

Administrator
Staff member
Try cutting off the trace to U7201, pin 20.
Choose a point where you can recover the trace later.

You can also try changing U7201 instead.
 
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