Sony Watchman FD-40A Wavy Screen

[aapljack]

I picked up a Watchman FD-40A from eBay. It was described as working. As it does work, the screen is wavy. Is there a fix for this? Maybe some caps that went bad?

Also, what kind of cord can input video in the A/V input on the side. I tried an 1/8" plug that goes to RCA connectors. Nothing. Also tried just the RCA video connector plugged in. When I touched the connector to the plug I got something, but when fully plugged in, nothing came though.