Picked up a Bally Mystic this weekend. Had sound issues and solenoids not firing, which I traced and fixed by repinning some connectors and repairing a fuse holder respectively. The last issue is that I am getting no displays. I have reseated the connectors, but other than that I haven't looked into anything else. They were working when the previous owner got the game and when he bought it, he put in LEDs (no board upgrade). Could the LEDs be causing a power issue, or is the board upgrade basically just used to stop flickering? Also, where should I look to fix my display problem. Thanks.

Thanks guys. I will check TP2 and adjust the pot if necessary and get back to you.

High voltage was a little low after testing, so I adjusted to pot to a 185-192 range. Still no displays. I have some smaller connectors coming in from Great Plains, so going to go through and repin them in a few days.

Great thought. I will check this tonight.

Looks like it's probably the connectors. No juice on any of the display driver boards.

Just something I noticed on the MPU. There is no connector on the pins at the very top of the MPU board. Previous owner took all of the connectors off when moving the machine. I looked through the cab and head and don't see another connector. Just want to make sure that I didn't somehow bolt down the head with a connector between it and the cabinet. I seem to remember that not all of the pins on some Bally boards are used.

That's what I thought, but I wanted to make sure. Thank you.