I seem to have damaged the micro USB port. It still takes a charge but won't work properly with any peripherals, e.g. it only works sometimes with a keyboard, and only if I jiggle it into place.
I see a replacement part on ebay: http://www.ebay.com/itm/Unbranded-UB-15MS10-10-1-Tablet-Micro-USB-connector-charging-port-repair-part-/281770601835?hash=item419ad62d6b:g:IoUAAOSwLVZVyXrx
How hard would it be to do this repair myself?