So I was trying to change a coil on my star wars pin and I accidently put the diode back in the wrong direction. I kept blowing the F5 fuse and the launch button and flippers didn't work. I tested the PPB board and found a bad TIP36 transistor. I replaced it, put in a new coil and diode and replaced the blown F5 fuse with a new one. I fired up the game and now it turns on and plays, but I don't have any sound or DMD display. The DMD works when the game first comes on and doesn't work any longer after that. The game also feeds two balls at a time to be shot into play. I don't really no where to begin looking for a solution. Can anyone suggest some thing I can start checking? Thanks.
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