820 3115 no power

[EJS]

820 3115, no power, mag safe stays green, no liquid damage. PP5V_SUS votage jumps all over the place. PPBUS 12.59v.

 

[2informaticos]

PP5V_S5 stable?
Do you get 3V3_SUS and 3V3_S5?

Test the board alone, nothing connected, apart of magsafe.

 

[EJS]

2info, i guess I did not leave my probe on PP5V_S5 for long enough yesterday. It starts at the correct 5v then starts bouncing around after a few seconds, I also get that lightning bolt on my fluke on that particular rail. 3V3_SUS and 3V3_S5 also jump around.

 

[JohnB8812]

Does Vcore pulse as well?

 

[2informaticos]

PPBUS_G3H is stable?
Steady green light on magsafe?
SMC_PM_G2_EN stable too?
Try another charger also.

 

[EJS]

Same mistake with PPBUS, it fluctuates from 12.59-12.45v

VCORE has 0v

SMC_PM_G2_EN voltage jumps all over the place

Green light on charger flickers very fast

have tried multiple chargers

 

[JohnB8812]

Ok inspect all traces from clock chip to Y2605. Also wouldn't hurt to replaced U2600. Let us know if you find any shorts a common one on these is the audio caps for PP5v_S3

 

[2informaticos]

SMC_RESET_L not stable?
3V42 rail fluctuates?

 

[EJS]

You nailed it JohnB, C6213 was short.

 

[JohnB8812]

BOOM haha good job!