sorry for slow response, on the left hand side(from the rear) there are two narrow panels which interface with the y-sus pcb, the large one, and the pdp (screen)
there is a small cable which supplies 5v and data to the lower pcb, take that off at one end and disconnect the same board (lower) from the large board, if you now get the top half of the picture your lower y drive is goosed, dont touch the ribbon side that connects to the screen at this stage, and get back to me
tony walker
btw what model is it