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820 3115 no power

E

EJS

New member
820 3115, no power, mag safe stays green, no liquid damage. PP5V_SUS votage jumps all over the place. PPBUS 12.59v.
 
2informaticos

2informaticos

Administrator
Staff member
PP5V_S5 stable?
Do you get 3V3_SUS and 3V3_S5?

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

EJS

New member
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.
 
E

EJS

New member
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
 
J

JohnB8812

New member
Ok so this could be a lot of things. Resistance between pins 17/18 and 27/28 of the ISL6259? Any liquid damage near BIOS, clock chip, SMC, etc? Check all rails for shorts?
 
E

EJS

New member
John B, resistance between 17/18 is 3.1ohm, and I get 20.4ohm between 27/28.

SMC and SPI ROM look very clean

U2600 looks okay how ever Y2605 does look like its been touched by some type of crap that I did not notice at first.

I am about to start on a hunt for shorts.
 
J

JohnB8812

New member
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
 
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