This video projection unit will not vertical sync. I have physically removed and inspected all the PCBâ€™s including the sync generator board and found nothing out of the ordinary. I have also switched the two input modules and fed a know good video signal into all inputs without any improvement. The vertical will not lock on manual or auto, the picture will either roll from top to bottom or vice versa. When in auto mode, the sync locks at 45hz and I am unable to change it. Since everything else has failed, I believe the problem is most likely an IC on the Sync generator PCB. Does anyone have an idea on how I should proceed or have a schematic of this board to assist in locating the culprit?