the loss of sync can be anywhere from the camera , connectors, video converter, display module.
If testing included dropping the camera, let us know. oops sorry had to ask.
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$18k for a used one for old VGA technology , wow.
It looks like the clock for Vertical sync is out of range and jittering on 3 positions of 1 line of text, which could be any analog failure causing that.
The cable may have enough wires to send HSync and Vsync with RGB signals but the receiver cannot obtain vertical sync so it has severely sloped (herringbone pattern) bars indicating the vertical error frequency is way off in between the text bottom left being occasionally in sync yet Hsync looks OK. the video is totally out of sync so pixel clock sync is not locked but Hsync is in range and square.
I see the vertical blank interval is visible black bar at the top, which confirms Vsync has failed.
I wonder what caused the failure. Were there PAL/NTSC options?
Once the cause is identified, the fix is usualy easy.