Macbook A1990 820-01041 no power after pouring coffee.

[ipetro]

The behavior and power supply on all ports are the same:
5.104V
0.053A

PPBUS_G3H=12.31v
PP3V3_G3H_T=3.37v
PP3V3_G3H_RTC_X=3.38v

 

[2informaticos]

Don't bother to check the same power rail on 5 points.
Do you really expect to get different reading?
Unless broken trace...

Check diode mode to ground on all secondary power supplies; big coils and page 79 outputs.
Compare with good board, or reference table.

OpenBoardData Project

 

[ipetro]

I apologize if I write incorrectly or too much!

https://openboarddata.org/ I always start my work with this resource.
I did not find any deviations in the coils.
Fundemental power off checks: сс1 and сс2 are approximately the same 0.550.
Chip voltages: around the chips are also all working and present. on all four chips all readings are the same and work normally.
Boot sequence:
PBUS=ok
PP3V3_G3H_RTC=ok
PP3V3_G3H=ok
VIN_RTC > VIN_RTC_UPPER_THRESHOLD
this section has all voltages
H9M LOAD SECURE ROM, SMC BATTERY TRAP
this section is not working.

 

[2informaticos]

Is the machine recognized into DFU?

 

[ipetro]

Yes, he is in DFU, but I didn’t do anything to make sure that it was safe! Is it possible to do a restore if the battery is low?

 

[2informaticos]

Some boards can complete DFU without battery, other no.
Restore will erase SSD, but data may be lost anyway.
Just in case, try revive first.