820 00165 No Power

[EJS]

820 00165 no power, board has 2 tiny spots of liquid damage on Q7630 and U1930. Magsafe lights, 8.57v on PPBUS. PP5V_S5 is present, when I measure voltage for PP5V_S3 at L4011 and R6414 I get 0, but when I take a measurement at L4605 I get a reading that jumps all over, very strange. I have replaced U1930 due to it looking like shit.

[JohnB8812]

PPVRTC_G3H present and stable? PPBUS Stable? PP5v_S4RS3 present?

[2informaticos]

Do you get steady 5V at L7520?
What about the other big coils?

[EJS]

PPBUS 8.57v stable
PPVRTC 3.346 stable
PP5V_S4RS3 0v
L7520 0v
L7560 3.347v

[2informaticos]

Do you get 3V3_SUS?
If not, check PM_SLP_SUS_L.
PM_SLP_S4_L pulsing at least?
L7520 should pulse at same time.
If yes, check if other coils pulse too.
Is better to check toggling SMC_ONOFF_L signal; use R5115/16 pads for this...

[EJS]

PP3V3_SUS 3.346v stable
PM_SLP_S4_L 0V no pulsing at least that I can seen on my Fluke, I dont have a scope
SMC_ONOFF_L 3.427v stable

[2informaticos]

"Is better to check toggling SMC_ONOFF_L signal; use R5115/16 pads for this..."
You need to see any reaction.

[EJS]

2info, I dont understand what you are asking me to do. Are you telling me to short the pads?

[2informaticos]

Exactly, like pressing power button...

[EJS]

Yeah, unfortunately im still getting no change bridging those pads.

[2informaticos]

Check S5_PWRGD, PM_DSW_PWRGD, PCH_DSWRMEN, SMC_ADAPTER_EN, PM_BATLOW_L.
Does MLB start on SMC bypass mode?

[EJS]

S5_PWRGD 3.399v
PM_DSW_PWRGD 3.426v
PCH_DSWRMEN 3.248v
SMC_ADAPTER_EN 3.426v
PM_BATLOW_L 3.343v
Not sure what you mean by SMC bypass mode, but I cant get this board to do anything as far as turning on.

[2informaticos]

Press power button, connect charger and maintain pressing 5-10s...

[EJS]

With SMC bypass i get about 2 seconds of fan spin, then nothing after that.

[2informaticos]

"i get about 2 seconds of fan spin"
That means L7520 gets voltage in this time.
Check which other big coils get voltage...