Hey all - new to the forum and new to owning a pinball machine! My father has a 1978 Bally Star Trek, and I've played it for over 20 years and loved it. My wife surprised me for my 40th with a 1993 Judge Dredd. I'm trying to troubleshoot an issue that I'm noticing on the system and I can't find any good resources after googling for few days and scraping the forum (maybe my search skills are just bad).
After warming up, all GI bulbs are flickering. Previous owner had replaced some of the bulbs with LED's, but the all of the backglass lights are still incandescent. I've reseated all of the power connectors to the lamp driver board, but still the issue persists. Is it possible for cheap LED's to backfeed and cause flicker in all GI lights? I've tried reading a lot about them but still haven't found a good answer.
I'm attaching a video of the flicker, hopefully someone has seen this before and could give me a starting point.