I have a Gottlieb Arena that worked 100% until the lane change switch wire came unsoldered and came in contact with a lug on the flipper coil. This sent solenoid voltage through the switch matrix and that was it...GI would come on game but would not boot. I replaced RIOTs U4 and U6 and Z14 and Z12 and game will now boot... however it is a bit of a basket case.
During attract mode the Q (game over) and T (Tilt) relays are opening and closing in rhythm with the attract light show.
In lamp test, inlane and outline insert lamps on a given side will BOTH turn on and off (alternating every second) even though it should be testing only one transistor. Some lamps in lamp test will light two insert lamps (like they are shorted together). However when testing the transistor individually (shorting them to ground) they only light the appropriate lamp. Some insert lamps do not light at all in test but will light when transistor is shorted to ground.
So long story short here, they lamps test ok when shorting the transistors but some don't test correctly when using the lamp test feature. (and they are spread over multiple flip flops)
I am able to start and play a game (but there is no sound) and it plays mostly correctly.
Would be possible/likely that I would have a corrupted ROM? I have checked many other things but nothing yet. I do not have a eprom reader at this time.