The symptoms are the failure of the lights to consistently turn on when you plug the empty charger into 220v. If they do turn on, we tried charging a few different known working batteries. The lights turned to red as it started charging but after < 1 min, it died.
Here are pics of the circuit board. There is nothing wrong to the naked eye.
This one for some reason died 1-2 years after normal use by one of my relatives. Right now they are looking for a replacement. I suggested a Unomat UNO1900 because thats what I'm using now. Click
So right now this broken charger is a paperweight. I'll make a few inquiries from electronics people but i dont think this can be repaired.