820-00850 2 ports 20V 2 Ports 5V

[No-Clean]

Clean board, boots up but wont charge on any of the ports, USB data only works on 1 port.

U3100 and U3200 only get 5V and 0.250A
PP1V1_UPC_XA_LDO_BMC and PP1V1_UPC_XB_LDO_BMC both are 0V
PP3V3_G3H_RTC_ISOL 3.3V
PP3V3_UPC_XB_LDO 3.3V
PP20V_USBC_XB_VBUS 5V
PP1V8_UPC_XB_LDOA 1.8V
Already replaced U3200 and made no difference, I'm hesitant to replace U3100.

UB300 and UB400 both get 20V

 

[2informaticos]

Compare diode mode readings on LDO ports between left/right CD3215 chips.
Also check U2890 and its traces/resistors.
Remove connectors from shell and inspect USB-C terminals on the bad side.

 

[No-Clean]

PP1V1_UPC_TB_LDO_BMC
PP1V8_UPC_TB_LDOD
PP1V8_UPC_TB_LDOA
PP3V3_UPC_TB_LDO

All the above are almost identical readings in Diode mode compared to left right sides.

U2890 was replaced before making the post, I forgot to mention.

 

[2informaticos]

Was U2890 affected by corrosion?
Check all its traces and adjacent resistors.
Did you replace with one from donor, same model?

 

[No-Clean]

No, board is clean no signs of corrosion, but U2890 I knew was related to the problem so I replaced it, first with one from different board model, than later after reading your last post, from the same model board and same problem, I also end up replacing the other CD3215 and checked all resistors around U2890, all of them are good, but no change at all.

 

[2informaticos]

You said to get 20V on two ports, but USB activity one port only.
So there must be a problem on these ports area too.

 

[No-Clean]

Al resistors around UB090 were fine and all LDO were fine also on both CD3215 that had the 20V, but I replaced UB090 and now I have USB-Activity on both ports on that side, but the other side still only 5V

 

[2informaticos]

May have problems with U2800, or some broken resistor.

 

[No-Clean]

U2800 was it, thanks a lot!