Help - my mint 1977 Magnavox Console

[Eric H]

Welcome!
I was going to suggest removing and reinstalling the boards, Modular sets were notorious for bad connections back in the day, much less 35 years later.

Other than that Bryan's idea to recap the video board sounds like a good place to start, I would check the transistors on it as well.

It could be an issue with the Chroma board too, if you could post a picture of it playing it might make it easier to pin down.

It sounds like you might have a picture that's all Chroma and no Luminance, though I think the picture would disappear if you tuned the color off in that case.

I recently found (and returned) a low hours set with the same or similar chassis, it worked great I just didn't need it. Wish I had it to offer parts from.