820-00928 - does not charge battery

[Palhano]

The main problem was the system that did not start, giving a critical update error.

There was a lot of oxidation near the U4200 and U3500. I replaced all the components (resistors and capacitor).

It worked well for 2 days, but now it doesn't charge the battery (Mac recognizes the charger) and the ports on the left don't work with accessories (pendrive, HD).

I checked everything near the U3500 and I don't have 5v on the L3500 with accessories connected.

Some help?

 

[2informaticos]

U3500 gets correct VCC and EN?

 

[Palhano]

It's not correct!
VVC - 5v
EN - 0

I checked the EN line in diode mode and got 0.540.

 

[2informaticos]

U3500 gets enable signal from U3100/200.
Compare diode mode readings on J3300 and JB500 pins.

 

[Palhano]

I discovered a resistor (R3517) with a soldering problem. I decided to soldier him again.

Thanks a lot for the help.