Battery replaced, charging port is fine, but will not charge.

I purchased a Micro awhile ago and tried playing it a few days ago. I've a few of these so I have made basic repairs in the past. In this case I replaced the battery since it had been so long since using it last. It won't charge now. The battery was tested in other micros, so was the charger. The charging port looks fine. After taking it apart however I did notice the 2 little wires behind the white box where the battery plugs in looks corroded or possibly shorted so I'm guessing no current is coming thorough. Not sure how to fix this or if its a lost cause. Can anyone help?