Start with the simple stuff. Re-seat the cable, push all the socket-ed chips, measure voltages if you have a multi-meter
http://pinwiki.com/wiki/index.php?title=Williams_System_3_-_7#Sound_.2F_Speech_Board_Issues
Another bunch of money to "do it right" https://www.phoenixarcade.com/search/node/tron
I restored one years ago and it's one of the sexiest arcade games ever....even if it's not that fun to play.
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