Quoted from robx46:No manual for this game so I'm doing my best based on other manuals from games of this same system. I have 1 lone lamp that won't turn on. I'm decent at working on games. Lamp turns on when I ground the anode so my wiring & socket are good. I replaced the SCR anyways, & replaced the CD4514 that drives that set of lamps. Still won't turn on! All resistors tested. Lamp board seems like it has no issues anywhere. Could a single lamp being out be an MPU issue? If so, where do I look next?
It could possibly be an MPU issue, issue with a header pin etc.
Which lamp is it?