Centipede PCB Problem

jeffsgames

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Donor 2011, 2015
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Sorry I don't have a pic right now. Will get one tonight, but I thought I'd throw this out to see if it is a recognizable problem. I have a good friend that has a Centipede and right after playing a few games the PCB bugged out. It now just shows a dot cloth pattern on the screen. Any ideas? I tried checking all the voltages, and then even tried the PCB in my working cab. Does the same thing. I'll get a pic tonight, but it's really just a grid of dots.

I've done the simple "reseat the socketed chips" fix attempt, and I've cleaned all the PCB edge connector contacts. I can't get the board to boot into the test mode to run it either.

Thanks in advance for any suggestions.
 
Well I spent about an hour tonight swapping socketed chips between a working PCB and this one, and nothing worked. I tried the 6502 and the ROMs. Also a couple others. I cleaned the edge connectors again just to be sure. I inspected all of the traces and solder points but didn't see anything unusual.

So I take it this isn't a common "trouble" screen. Bummer!
 
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