My Magnavox 27Y100-100AA TV sets colors started to go all wonky. It also lost that little "bzzt" noise it makes on power up. The degaussing coil ckt must be T.U.
So I popped it open and discovered:
The degaussing coil is connected through a relay and a "3 terminal PTC resistor" to the AC mains. The center lead pad on the circuit board was scorched. I soldered a jumper from the lead back to the relay, bypassing the burnt spot, and now all appears well.
Question: I can imagine two possible failure modes.
1) Just a bad solder joint on the board finally went out.2) The PTC has some intermittent failure which overheated the connection and will do so again at some point.
In your experience, which is more likely (should I waste my time hunting for a new PTC resistor unit)?
If its #2, I'd like to get the bad unit out before it burns out the next component in this circuit, but the intermittent failure seems unlikely. Usually when these kinds of things fail, they're gone. Its working fine now.