80's Zenith with an ODD Issue

[jstout66]

Remind me never to get "newer" stuff from the free section of Craigslist. (Doug.. quit laughing.. haha)
Zenith must have taken a huge downward spiral after 1982, and going forward, I will never get another Zenith TV made after that year, as every one I have snagged after that date has been a total POS.
Here's the issue....
Turned set on and picture came on for a second, but looked like a film negative with retrace lines. Picture went away.
You can hit the menu button and the menu comes up, but the instant after you exit the menu screen.. no picture.
Thought? Zeno????