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SE/30 unusual video issue

Durosity

68000
Picked up an early revision SE/30 board (the the wee bodge wire) today with video issues.. not the usual ones we get mind.. just a faint line on the screen that looks like it’s changing (possibly a video signal?) @mrkirkby thought it may be one of the U*8 chips but before I go swapping them with known good ones anyone else have any ideas what it could be? Video of behaviour attached.

(Also I’m only just getting back into this after quite a long time away with problems so please excuse my poor description of the issue… I’m kinda trying to retrain my brain a bit! 😅)

View attachment IMG_9280.mov
 
Vsync line?..

I'd probe between UG6 and UF8 along with other destinations around it. Corroded via maybe?
If you have an oscilloscope it might be worth looking at what's bouncing.. (or not)

Screenshot 2025-01-30 at 19.31.29.png
 
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