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I AM HAVING THE EXACT SAME PROBLEM WITH MINE ! But before mine turns off, it shows a blurry squiggly red mark on the screen then shuts off and wont turn back on sometimes for several hours.. And everytime I CAN get it back on, I have to unlpug the whole thing and plug it back in...
A temporary solution is to unplug the TV for a few minutes, remove static from the glass with your hand. It is important to unplug rather than turn off. If you have a degauss button you can also press that before unplugging. Wait several minutes or an hour. Then plug it back in. If you have Picture in Picture it may be an issue with that and to permanently solve may need a repair person. The unplugging may get you by for a few days at a time. That's at least better than an hour.
It sounds like the screen has become magnetized by the magnets in the speakers.
Inside all analog TVs is a device called a degaussing coil. When you turn on the TV for the first time (cold), the degaussing coil is energized for a couple seconds to demagnetize the screen and then it goes off.
You can purchase an external degaussing coil and demagnetize the screen youself. A degaussing coil looks like a small hula-hoop about 6-8 inches in diameter with a AC line cord attached. I've even made these coils out of long lengths of enameled wire, electrical tape and a line cord.
Once itas plugged into the wall outlet, you hold it close to the screen (1/2' away) with the hoop facing the screen and move the hoop in a circular pattern, covering all areas of the screen and slowly move the hoop away from the screen while still moving in a circular patten until your about 2-3 feet from the screen.
If you did it right, the color splotches will be gone.
It's possible that the coil in your set is bad. The coil is energized for a few seconds when you turn on your TV and then it shuts off a few seconds later. You can try turning on the set for around 30 seconds, and then turn it off. Wait about 10 minutes and turn on the set again. Doing this several times may let the sets internal coil (if its working) to demagnetize the screen. If not, you'll need to use a degaussing coil.
Let me know if I can be of further assistance to you.
most atimes if i adjust the screen adjuster on the voltage multiplier i always observe that the screengoes green(lg 21" television),and if i readjust the screen,the greengoes off.Rubberhead,try adjusting the sceenknob on your voltage multiplier(line transformer).