I have a CBW that at first would not load multi-ball (2 ball) correctly. It would hold first ball ok in habit trail, but would not load another ball to shooter lane. I ran through the self test and found the trough switch was out of adjustment. Fixed that, game ran ok a few games then straight downhill. Now I can't get game to boot up at all. Beeps on powerup, 1 credit showing (not sure why "free play" not displayed though) LEDs flashing on 3 boards, sound ok (female says "One more for double"). I can get into first step of check mode , but game won't initiate any of the self tests (no flipper or start button recognition) Started checking boards (power supply, battery voltage on A1 board, etc) that's when I noticed a fried transistor on controller board (A3). Transistor fried is for the kicker solenoid, which come to think of it, I never heard work while I had game.
Question: could that fried transistor be causing EVERYTHING now going on? Or is it likely that was fried before and now I have multiple issues to fix?
Should the controller board just be replaced entirely due to damage? I can't imagine I could cleanly solder in a new transistor at Q30.