Zenith System 3 Question

[magnasonic66]

This is one of those questions some of you dread seeing. Please ignore this if you think so.

I have a 19 inch Zenith System 3 set which worked fine up until recently, then the picture turned into scrambly snow, and some sound was still evident. I'm only using DVD VCR combo on it, and checked to see if any controls or a reset are on the back. Only controls are under the front panel.

Could this be an easy fix, or one of these tedious tracing jobs to find what went out where? I realize the information is sketchy but I have a feeling someone here has an identical set that may have had such a problem that could be corrected without major surgery or emptying my bank account. I don't have its original remote control, if that has some kind of adjustment sequence on it that could restore the picture. If anyone has a clue please let me know. It's the set on the right in this ad. Thanks in advance.