820-00850 runs on battery but not on charger

[sekidata]

This one has me stumped, though it looks like it should be an easy fix!

Customer brought in an A1989 with a bit of liquid damage, which I cleaned up. It starts up and runs off a charged battery but does not recognize the charger on any of the 4 ports.

Without a battery, all USB-C ports show 5.12V 0.25A. When the machine is running and I connect a charger, I get 20V 0A.

LDOs on all four CD3215s are good. All CC lines show the correct expected behaviors. PP1V1LDOs are present on the plugged-in port. What am I missing?

 

[2informaticos]

PPBUS_G3H and 3V3_G3H voltages with charger alone?

 

[sekidata]

PPBUS is 12.28V and 3V3_G3H_RTC is 3.38V.

 

[sekidata]

Just discovered another tiny bit of corrosion around one of the CD3215s (UB300). I reflowed it with flux. Now I get 20V on all ports and the machine charges the battery.