820-00840 power plug works one way not other

[Roshon]

on port for U3200 a/c adapter works one direction when flip over it does not i tried different cables with usb volt meter it goes to 5v then 19.5v then shuts down

 

[2informaticos]

Clean connector terminals.
Compare diode mode readings on terminals between both ports.

 

[Roshon]

they are the same on both sides

 

[2informaticos]

Compare diode mode readings on CC1/2 lines between both channels.