I have a PS Vita joystick that is completely unresponsive, i.e. no drifting or spotty signal. I opened it up hoping to find contacts to clean, however it appears there are only three blob chips, with some ground pads. Any idea what might cause the unresponsiveness? Since the left and right joysticks are symmetrical, I plan on swapping the right to left to check the ribbon cable connector and daughter board.