Super Punch-Out graphics problem

MaximRecoil

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The SPO boardset seems to have something more serious going on with it however. Most of the graphics are corrupted (well beyond a few glitches). The audio seems to be working fine. I last had it on maybe a week ago and it was working fine. I went to turn it on last night and it was in the state it's in now. I swapped the PO boardset into it and it was mostly working, with those few glitches here and there. That's when I checked the +5V. Well like I said, adjusting it to 5.02V solved the PO issues, but did nothing for the SPO issues. I just did the reseating socketed chips and cleaning the card edge routine, but no change.

I've narrowed the problem down to the CPU board by swapping the 6 SPO ROMs and protection board from the malfunctioning SPO CPU board over to the working PO CPU board, and then swapping that onto the SPO boardset. The result was a perfectly working SPO boardset.

It is probably another TTL logic chip gone bad (I've already replaced two of them in the past on that board to fix two instances of audio problems).

Since the SPO-specific parts have been eliminated from being the problem (ROMs and protection board), what does that leave which could cause garbage graphics? The graphics aren't 100% garbage; for example, part of the wireframe that makes up your playable character is intact, while the rest of him is garbled. The same partial corruption applies to the rest of the graphics, on both screens.
 
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