Monitor issues - Vertical rolling

I'm having some monitor issues, and I'm hoping somebody could shed some light on this for me.

I brought home a big red cab a while ago. It worked fine when I tested it on location, but it started giving me problems as soon as I got it home. The screen rolls vertically. I had a buddy of mine come over and fool around with it, he said I needed a new power supply so he loaned me one of his. It didn't fix the problem, but the next day after a little gentle shaking the screen stabilized.

But every now and then the monitor does the same thing when I power on and I need to shake it up a little.

I'm wondering if this is a sign of my monitor slowly dying on me, or just some loose wires. Also is this something that a cap kit would fix? I wouldn't think so, but my arcade knowledge is still pretty limited.

you adjust the V-hold?

Sounds like you may have some cold solder joints. Check especially the harness for the yoke. The solder holding the pins in will sometimes crack. Could be a dying cap though. Cap kit wouldn't hurt and check for cracked joints while you have it out.

Great, that's some good info. It doesn't sound too difficult, hopefully I can fix this myself.