I had a problem with my upper flipper not working consistently. So I replaced a tip102 and a 1n4403 for the upper flipper and when I put it back in, it made a wierd sound from ​the speakers and my dmd looked corrupt. Also the upper right flipper locked on.

I doubled check my solder work and it was spot on. When I disconnect the ribbon cable, the displays work correctly and the flippers work correctly. I doubled checked my ribbon cable and connectors, all good connections.

I had a replacement sound board (untested) and switched the Rom over. The sound doesn't work but the display is fine and game works fine as well. So...

What could have made my sound board crap out?
Where can I download a Rom to test to see if mine is now corrupt? Planetary and ipdb don't have sound ROMs.

Otherwise, flipper seems fixed. Just no sound now.