I have a Bally City Slickers that died at the 2012 TPF and is finally back on my list of projects to repair finally. During teardown I discovered that the wires going to the speakers had shifted position at the last second and been crushed on the metal vent grill as the head was put upright during setup. During the setup prior to the show when the game was originally powered on it appeared to start normally. But when I went to play test it, it would not start a game and was acting weird. I powered it off and back on again and all I get is the lower right diagonal segment lit in each character of both displays and the game no longer boots. During my troubleshooting as the show was about to start, I could not find anything burned or blown. I ended up swapping my spare 6803 MPU board into the game and it failed the same way as the original.
I have repaired the damaged wires where they were crushed. I figure I probably have damaged my audio board and likely the PIA or something else on the MPU boards. I will repair the two dead MPU boards or send them off to Borygard who has a test figure for 6803 and let him do the repair work. I have one more NOS spare 6803 MPU board in my parts cabinet that I am willing to try once I think everything else is okay.
Any ideas as to what may have been damaged by the audio output getting shorted? The game is not the greatest but is different and I really want to get it back up and running again.
Thanks!
-- Shawn