Care to help diagnose this Zaxxon PCB?

keithsarcade

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Thanks to Jeremy, I now have this broken Zaxxon game to play around with. It powers up, gets garbage on screen. All voltages seem to be fine. I figured I'd try reseating all the chips, and while doing that, I found the 2 smaller ones on the top PCB (at U98 and U72 IIRC) were pretty dirty, the legs were pretty black all the way down. So I cleaned those up for good measure.

After putting everything back together, I was pleasantly suprised to see the high score screen, only problem is its upside down, and its stuck on that screen. Inputs do nothing still. Sometimes it will boot to this screen now, and sometimes it still gets garbage. If I turn it off and back on in a few seconds (while the monitor is still warmed), I can sometimes see a second of garbage, then it goes to the high score screen and freezes there.

I'm no expert in PCB repair, but I'm guessing theres something on the board thats causing it to "time out", am I correct? Either way, anyone have an educated guess as to what might be causing this and what might fix it?
 

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Zaxxon Repair

I'm having the same issue on my Zaxxon. I have two known good PCB's displaying the same problems. Did you ever find a root cause for yours?
 
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