1980 Magnavox 13" color

[zenith2134]

So this TV has developed a video issue...On a black raster, or a night scene, the brightness changes from one side to the other. (it is not a uniformly bright background). Should I just recap the neckboard and check for out of tolerance resistors? Normally this cures this symptom, but I was wondering if someone had the prints for the C2 chassis (the fold down chassis). I've already found 2 charred resistors in the horizontal osc section, 330k 0.25W which I changed with 330k 1W parts.
The CRT is excellent otherwise I wouldn't bother.
I'm willing to bet that someone on the board has repaired this exact symptom in one of these years ago.

[rca2000]

"Shading" is nealry always caused by horizontal getting into the video, from a bad capacitor in the video bias supply for the drivers for the CRT cathodes. Usually--there is a capacitor off of the flyback, 10/250 or so. On your set--it MAY be higher, or not--and may be on the chassis, near the horizontal section, or possibly the power supply area. It MAY be on the CRT board, but likely not.

IF you see an electrolytic cap of 200 or more volts on the CRT board--this is likely the one. If not--hunt for it on the chassis. BE AWARE--that even if you DO find one on the CRT board--there MAY STILL be one near the source--on the chassis.

[zenith2134]

Thanks for that info! I'm going to dig into it tomorrow most likely. I haven't really worked on a TV with this chassis before. The design is interesting, for what it is.