820-00138 - PPBus 5v

[Palhano]

Mac arrived dead. With the PP3v42 measuring 1v.

It had oxidation in the area of the U7090. I changed it and resistors, now I have 3.42 on PP3V42_G3H, but PPbus I have 5v. MagSafe LED only green!

U7090 pin measurements
1 - 1.16
2 - 3.42
3 - 7.3
4 -3.42
6 - 16.35
8 - 16.35

SMC_RESET_L - 3.12
SMC_PM_G2_EN - 0

Problem with SMC?

 

[2informaticos]

Post Y5110 voltages.
Check for correct oscillation, if o-scope available.

Reball SMC...

 

[Palhano]

I don't have an oscilloscope.

Y5110 - p1 and p3 - 0v

I will try the SMC.

 

[2informaticos]

Once SMC removed, check traces and resistors related with Y5110.

 

[Palhano]

Reballing on smc worked! Thank you for your help!