Hi my daughter dropped her ds and the hinge snapped so got a new shell and bracket, took the old one apart carefully and began reassembling reconnected the cables from the board and went to test and all seems fine except the top screen which is white and blank, as the units still in pieces has a fiddle and the board that screws ontop of the speaker with wires which go off to the screen and the screen lights up and works as its meant to screw it down turn it off and back on its blank again. Tried unplugging the connectors and trying again but still the same happens. Could this be the cable or the board or am I missing something..