Hopefully someone can give me a few pointers I'm new to this forum and I have a South Park machine that the display quit working.. I've replaced the display power supply and when I boot the pin it displays the display Rom ver on the plasma and then goes black nothing more during game play... I'm wondering what is the likely culprit.. Im assuming it's an issue with the sound/cpu board 520-5136-00 as it controls the plasma controller via a ribbon cable? So please any feedback is appreciated.

Yes I tried reseating all the ribbon cables and it happened prior to replacing the display power supply I just replaced that because it had some noticeable heat stress and thought it might have been the culprit