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The TV may be picking up stray radiation from another piece of equipment, try disconnecting and unplugging all other digi/cable/dvdplayers/phones etc. to isolate the offending article
If the "blocking" of your screen appears to be a random pattern, you have a cluster of dead pixels, and it is best to replace the entire set (as repairs are unreasonably expensive). If you are seeing a black SQUARE at the bottom of the screen, turn off all closed caption and text options.
when the color wheel stops the picture will be all over the place. and you will have lines when it starts to fail as its not going fast enough for the picture. wining sound is it wearing out.
It could actually be quite a few things, loose wire, loose solder piece, bad crt's/picture tube, bad system board, or others. It's would have to be diagnosed with testing equipment. It will probably cost you another 150-200 for the new part to be put in.
This is due to vertical section failure. Change the vertical supply rectifier diode and supply filters. Then check zener diode leakage in pumpup circuit section. Also check any electrolytic capacitors leakage in vertical section. If it is old model tv change vertical height, vertical lenearity presets also. I hope given details useful to you.
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