820-00165 MacBook Air 2017 water damage

[lincev]

hi again, I have this board with water damage.

I check short but I can find this

Without battery when connect charger I have led green after orange..

PPBUS_G3H=0v

any ideas?

 

[2informaticos]

Post U7100 basic voltages; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 20, 27.

Which areas have been affected by liquid?

 

[lincev]

PPDCIN_G3H 16.5 V
PP3V42_G3H 3.4 V
PPBUS_G3H 8.6 V
PP3V3_S5 3,30 V
PP5V_S4RS3 0 V
PP3V3_SUS 0 V
PP1V2_S3 0 V
PP1V8_S3 0V
PP1V05_S0 0V
PPVCC_S0_CPU 0V
ALL_SYS_PWRGD 0 V

U7100

Pin 1 0v
Pin 2 16,50v
Pin 3 0v
Pin 9 0v
Pin 12 0v
Pin 13 0v
Pin 14 0v
Pin 15 0v
Pin 17 0v
Pin 19 5v
Pin 20 5v
Pin 27 16v

liquid at back all logic board

 

[2informaticos]

"PPBUS_G3H 8.6 V"
This implies SMC_RESET_L is good; why don't you get 3V at pin 13?
Check R7100.

"PP3V42_G3H 3.4 V"
Why don't you get 3.4V at pin 12V?
Check the trace.

"Pin 3 0v"
Fix ACIN problem too; check R7110.

 

[lincev]

Check R7100 I don't have value only continuity and R7110 = 480ohms

 

[2informaticos]

If R7100 is 0 ohm, why don't you get 3V at pin 13???

R7110 is 130K resistor.
It will measure lower onboard, but far of 480 ohm.
Post diode mode to ground at pin 3.

Please, try to understand a schematic!