Hi Bob, I've got the same problem with my pacman. Video is here: https://youtu.be/L7qSNZ1qjn8. The screen then goes black after about 30 sec and there's a clicking sound coming from the speaker. I'll try replacing the 6 video RAM chips, but could you please tell me where they are located? And where would be a good place to get replacements?
Pacman is only my 2nd game so I don't have a lot of experience yet. Thanks! Doug