820-3115 blinking greenlight

[PhilipC]

liquid damage near u7200 and u3890 area

g3h = 12.58v
smc_bc_acok = 2.9-3.2v fluctuating

fan is jerking like its trying to start

 

[PhilipC]

replaced ISL and current sensing resistors all measure good. Still same symptoms

 

[dukefawks]

R7005 ok? Short on L7220 or L7260? U7200 replaced?

 

[PhilipC]

R7005 ok
L7220 600ohms to gnd
L7260 0.7ohm to gnd

removed L7260 pin1 is 3ohms to gnd pin2 67k
pump in 5v and see what gets hot?

 

[PhilipC]

injected 3v and c4696 was getting hot, replaced it and now it's up to a 50 ohm short to gnd.

It does now boot though

 

[dukefawks]

Can well call this fixed then?

 

[PhilipC]

is 50ohms ok? i measured another board and it was at 600ohms

 

[larossmann]

You would trust & keep the original U4600 after this?