JVC AV-27432 strange noise pattern

[grossbard]

I'm back again with a new problem! this time it's on this JVC AV-27432 a family member gave me. It's a great looking set with component, but it has this weird noise pattern that shows up all the time, and it's even more pronounced on the component input.

I took a picture of the noise on a black screen with the brightness turned all the way up so it better appears on the camera. I tried to take a video but my phone doesn't work well when filming CRTs.

The noise pulsates from left to right and the pattern randomly changes in size. I've already replaced all the caps in the power supply, neckboard, and deflection area so I'm not sure what else to try.

Also: the forum rotated the picture 90 degrees counter-clockwise for some reason.