The inner connector in the mini-USB port is easily damaged (I much prefer the Apple design). That was the case on this tablet - a proper connection could not be made to recharge the tablet, rendering it useless.
The hardest part of this repair was separating the case without any fractures. I went slowly, starting at the point for holding the stylus, used a plastic spudge for most of it and a very thin knife blade in one area near the top. Once the case was open, the rest of the repair took at most, 10 minutes.
Go slow when opening the case, use the plastic spudge for lifting the connectors, be sure to reseat them firmly.