Diagnosing Konami Windy Wiggly / Wavy Image

[Arcade-Projects]

Hello,

I just picked up a Konami Windy candy cab that needs a little work. The image on the monitor is wiggly/wavy as you can see in this video:

https://imgur.com/a/HZ65HR1

I'm generating the pattern from a CPS2 test menu. I'm wondering if anyone can tell me what the likely cause is here? I'm thinking of checking the capacitors, but a friend mentioned maybe it could be a grounding issue?

The monitor board is a Toshiba PB6643-1, Neck is PB6644. I believe the monitor is K29CR55 and...

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Source: https://www.arcade-projects.com/threads ... age.28228/