I'm sure this forum has been done a lot so please forgive me but I'm new to pinside. I recently picked up a Simpsons pinball that I bought at auction sight unseen (800 bux!). Playfield back glass and cab are in great shape, however I can only get one of the two displays to work. It has the +100 -100 and +5v so its getting power. Is there a resistor or anything on the display board that could cause only one of the displays to go out? Glass on it is not cracked anywhere. Any help would be great. Thanks