Both of the tvs I mentioned were samsung. I still have both & the last time I fired them up (several years ago), they both worked fine. The b/w set has been sitting in the garage. The VHF knob broke off years & years ago, but I had a construction toy thing that fit on there perfectly & has been making a fine knob ever since. It also has "channel 88 is not available" burned into the screen, because I used to put the cable box on a null channel when there was nothing decent on, so I wouldn't have to get up & turn the tv off.
The color set had no issues that last time it was fired up.
Of course, with the digital switch, both sets are of little use these days. Still, I could hook up one of my old game systems or VCRs to them.