I recently got a Sunnyvale sixer that was not working and after replacing the usual parts I brought it back to life... but I'm getting some weird issues that do not effect every game and the effects are different for each game they're happening on.
Examples I've found:
Seaquest, after a few seconds of play the ship will stop in place along with the torpedo, if I got a chance to fire one, but enemies keep moving and the ship will not explode when hit.
Frankenstein's Monster, works fine until the level that the bottom platform moves back and forth across the pit. When the platform hits the right side it gets stuck and jitters until a lightening strike happens.
River Raid, video example
I have not done a lot of testing yet, just got it out back together today, but other games I've tried seem to work without a hitch. So what might it be?