we have had the same problem (after being dropped the charger port snapped off the inner board)
I managed to open the tab by very carefully running a thin screwdriver around the seam and popping open the clips that hold the back on, once opened I had to unscrew the main board and found the charger port had come apart from the board
It looks to be as simple as re-soldering the three points that hold the power port in place (I just need to buy a soldering iron first)
anthony whittaker, December 2013
