820-01700 water damage dead 20v 0.05a

[yair37]

UPDATE:
o.k i was find new water damage on U7370 i was clean and replace some components there, i was try again DFU restore but nothing..stuck on installation system and nothing on the screen and no fans.
i was also replaced U7370 but still the same.....

 

[2informaticos]

That is one of CPU power supplies; bad news...

 

[yair37]

dead CPU? HOW CAN I BE SURE?

 

[2informaticos]

Not sure, but liquid sign in that area could be damaged PCH/CPU...

 

[yair37]

something that i can check?

 

[2informaticos]

You can try heating BGA chips with quality flux.
No need to melt the balls, only burn eventually accumulated crap.

 

[yair37]

im suspect R7370 its nit look perfect can you tell me what values i need to get there?
Without R7370 dido mode
CPUSA_ISNS_N- 945
CPUSA_ISNS_P- 1175
PPVCCA_ISNS_S0_CPU-32 short to ground
PPVCCA_CPU_R-185

with R7370 ALL SHORT

 

[2informaticos]

Cannot find PPVCCA_ISNS_S0_CPU in schematic.

However, do NOT make wrong assumption.
No idea where did you get 32 ohm; but if is on a CPU power rail, that should be correct value.

 

[yair37]

PPVCCSA_S0_CPU sorry

 

[2informaticos]

Then seems to be good value.
R7370 is only 2 miliohm resistor.
Overvoltage induced there by liquid, could damaged CPU.