Since L and the dpad are both wired to the same side of the board, find an area with traces without anything on either side of the board, (except the traces obviously,) and use scissors with sharp blades, and cut it. WHATEVER YOU DO DO NOT CUT ANYWHERE NEAR THE MAIN CHIP. If it's your first portable, and you don't have experience with cutting motherboards, try to cut as far away from the chip as possible.