Not sure what cables you reseated, but this seemed to fix a similar problem here:
I just had a similar looking problem tonight, and reseating my ribbon cables solved the issue. One seemed to have shaken a little loose, and I suspect that was the issue.
Replace the cables. They are over 30 years old and most likely have internal corrosion.
Re-seating them will probably work but it isn't a fix. The problem is likely to return.
Last time I had a scrambled dmd, removing and reseating IC chip fixed it. Try doing that with U6
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