820-01814-A turn on not charging.

[Yoel Ren]

hi, this came in with iquid damage at u3200 and u3100 area..
i replaced both u3200 and u3100, now board will turn on, run off battery, but not charging at all port.
i measure that ub300 and ub400 got pp1v1 when plugged in to their corresponding port, but u3100 and u3200 doesnt get any pp1v1 at all.
i wonder maybe thats causing the not charging, any idea ? TIA

 

[2informaticos]

The board runs with charger alone, connected to U3100/200 ports?

 

[Yoel Ren]

no, board only turn on with battery.
if without battery, all 4port behave the same. only stuck at 5v 0.26amp..

 

[2informaticos]

That's the reason battery is not charging.
Need to fix USB-C problems first.

Compare diode mode readings around U3100/200 with UB300/400.
Probably some corroded resistors, or broken trace.
Also check U2890 traces/solders and surrounding resistors.

 

[Yoel Ren]

my bad, i use bo3 version instead of c00, replaced both of them, and all 4 can switch to 20v and its charging now, thanks a lot!