1981 Magnavox with a problem.

[DavGoodlin]

I recall an issue with solder joints on these sets. If you have HV, but no sound, that points to a "power supply" voltage common to both audio and video.

The key thing to remember is that not all power supply voltages come from a resistor (or voltage ladder) off the main power supply from the power transformer.

Many of these lower voltages are derived from a winding tap on the flyback, that feed a rectifier diode and finally a smaller value electrolytic cap. See if you have DC on the cathodes of any rectifier diodes fed from the flyback. Often, there is a low value or "fuse" resistor in series there.

I do not have the schematic on a set this new, but I could point it right out if someone could post it.