Picture tube does not display full picture,Crackle from back

[bgadow]

For the first problem, check to make sure the ion trap (if this set uses one) is adjusted properly, and also check that the yoke is in the right place. How is the plastic around the yoke holding up? The stuff they used on a lot of them has basically turned to dust. That can make it difficult to have the yoke sitting just where it should. Fixable with some creativity.

The crackle is a high voltage arc, most likely. First, make sure everything inside the cage is clean. (no dust) If that doesn't help, there must be someplace in there where a wire or other conducter is too close to something else. If it persists you can (carefully) operate the set with the cage open, in a darkened room, and narrow down where the spark is jumping.

Good luck!

[Phil Nelson]

Needless to say, you should not play a TV for long periods when it's sparking or making crackling sounds. A short circuit won't heal itself. More likely, it could get worse and/or damage other parts of the set.

High voltage is dangerous. If you aren't experienced in TV repair, I'd hand the set over to someone who is.

Phil