Need Help/Advice For Sony PVM

[jmetal88]

This is not so much a TV problem as a monitor problem, but I couldn't really think of any place better to ask, so here goes.

I have a Sony PVM-14M4U that I like to use for playing old video game systems that use composite video, S-Video, or RGB outputs. It has a great picture, and worked flawlessly when I purchased it a little over a year ago, but I noticed after I moved this past summer it started exhibiting an interference pattern in the video. It doesn't matter which video input is being used, which outlet the monitor is plugged into, or how isolated it is from other equipment; it always shows the same crawling diagonal line pattern over the image on screen. Same situation even here at my parents' house, where I brought it so I could mess with a computer that outputs a PAL signal while I'm home for Christmas break. At first I thought the interference was being passed along by the video source, but the interference doesn't appear on any of my 'normal' TVs, and like I said, I discovered afterwards that the same interference appears with any source.

All that being said, what might typically cause interference on a set that looks like crawling diagonal lines, and what might I look into doing to fix it? This thing has such a great picture otherwise that I don't think I can stand just leaving it be. Should I just start replacing capacitors, or what?