So I think I may have buggered something up.

The video on this set was working, but the VCR did not work (it would attempt to read the tape, then eject it). I was thinking I could clean the mode switch on the VCR board and reassemble—I was able to do that and get it reassembled, but now cannot get anything to display (and additionally the VCR is not loading tapes properly, so I suspect I didn't get the mode switch oriented correctly when I reassembled it, but I will revisit that later).

I can see the filament glow when I power the set on, and audio seems to be working...