820-00138 No green light

[No-Clean]

Board had a bit of corrosion on R5005 other than that rest of board is clean.

PPBUS 12.2V
PP3V42 1.7V
SMC_BC_ACOK 1.7V
R5187 OK

First reballed SMC same thing, then replaced it same thing and also replaced U7100.

U7090 was replaced also, R7095-96, R7001-02 OK removed C7095 all that and still no power or green light, any help will be greatly appreciated.

 

[2informaticos]

Did you check 3V42_G3H once SMC was removed?

Post all U7090 voltages and diode mode to ground at L7095.

 

[No-Clean]

I did not check it, will note that for next time.

L7095 Diode reading 321

U7090:
1 - 1.3V
2 - 1.9V
3 - 4.3V
4 - 1.9V

5 GND
6 - 16V
7 - 0V
8 - 16V

 

[2informaticos]

Replace C7094.
Be sure to have good solders and traces around U7090.

 

[No-Clean]

Hell yes! Thanks!

 

[No-Clean]

@2informaticos Board is back, same problem, after removing it from case board sometimes starts up but with pp2v32 low at around 3.1V when board doesn't boot pp3v32 is around 3V even, removing C7095 helped apparently but eventually same thing.

 

[2informaticos]

Change all resistors and capacitors related with U7090.