[SOLVED]Macbook air 820-00165 Dead no greenlight no PPBUS_G3H

[punkieftw]

Hi guys, I have a 820-00165 without PPBUS_G3H.

I don’t know where start to fix. Seems like a short to ground but Im not sure.

I let you see my measures.


PPBUS_G3H : 0.50v @ F7140 (Its pretty curious but that measure is going down so slowly)
PPDCIN_G3H_ISOL: 14.93v @ R7005 Pin 1

PP3V42_G3H: @ C5120 2.52v

On U7100

Pin 19 & 20 : 5.05v

Pin 2 : 14.71v

Resistance between pins 17 - 18 : 3.3 Ohms

Resistance betweens pins 27 - 28 : 20.0 Ohms

Pin 27 - 28 : 14.5 v

Helpme!

 

[dukefawks]

Why are you looking at PPBUS when PP3V42 is not even there. Resistance to GND on PP3V42? Liquid damage?

 

[punkieftw]

Hi, thx for helping me. i dont know how is first thats the reason why i looking ppbus first.
There is no liquid damage.
The resistance to ground on PP3V42 is 14.50 kOhms
In diode mode have 345

 

[punkieftw]

HEELLO? hellp?

 

[dukefawks]

For instant personal support contact me in DM for the $500 per day "personal support plan".

Voltage on U7090 pin 6? Voltage on L7095? Check board for corrosion?

 

[punkieftw]

Voltage on U7090 pin 6: 14,71v
Voltage on L7095: 2,70v Both sides
The board don't have any corrosion. looks pretty well.

 

[aprendiz]

2.7V on L7095 is too low, check if feedback resistors are ok (R7095-R7096), other than that , U7090 is bad....

 

[punkieftw]

2.7V on L7095 is too low, check if feedback resistors are ok (R7095-R7096), other than that , U7090 is bad....

Thanks you aprendiz. i replace the U7090, and the R7095-R7096 and i get green and orange light. will test but i think this is done.