Help from galaga experts?

hezkezl

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Anyone seen anything like this before? The connections between 00xx and 07xx seem fine, and I can't find any shorted traces in the area. What's especially bizarre is that although it looks from the screen like 128V is held low, it seems to be pulsing fine, and the repeated text wraps around to the bottom of the screen... any clue?
 

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Anyone seen anything like this before? The connections between 00xx and 07xx seem fine, and I can't find any shorted traces in the area. What's especially bizarre is that although it looks from the screen like 128V is held low, it seems to be pulsing fine, and the repeated text wraps around to the bottom of the screen... any clue?

Bad video address line or bad 00xx./socket
 
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