Mr. and Mrs. Pacman light/display problem after mpu corrosion rebuild
It's almost like there is a crossed signal or something because at times some of the lights will look correct (particularly the pac maze) and other times they won't - when some lights turn on or off it seems to affect other lights, maze, and score displays. None of this problem existed before so it would seemingly be an MPU board issue.
I've checked a number of chips, particularly near the battery area, to make sure each pin traces properly to wherever it's supposed to go, and that I don't have solder splashes from one pin to the next.
This is the only pin I've ever owned so I'm not that good yet at diagnosing this kind of stuff. Anyone have any ideas on what to check? I've got a logic probe and an o-scope at my disposal if that matters.
It would seem to me that focusing in on what's going on with the score displays would be easiest, but what do I know.
Here's a video that focuses on test mode, showing both the lamp test and the display test.
Here's a video that shows attract mode.
It's almost like there is a crossed signal or something because at times some of the lights will look correct (particularly the pac maze) and other times they won't - when some lights turn on or off it seems to affect other lights, maze, and score displays. None of this problem existed before so it would seemingly be an MPU board issue.
I've checked a number of chips, particularly near the battery area, to make sure each pin traces properly to wherever it's supposed to go, and that I don't have solder splashes from one pin to the next.
This is the only pin I've ever owned so I'm not that good yet at diagnosing this kind of stuff. Anyone have any ideas on what to check? I've got a logic probe and an o-scope at my disposal if that matters.
It would seem to me that focusing in on what's going on with the score displays would be easiest, but what do I know.
Here's a video that focuses on test mode, showing both the lamp test and the display test.
Here's a video that shows attract mode.
