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IF IT USES A LAMP AND HAS THIS -- the problem is inside the optical light engine--a lot of them get damaged from the intense heat from the lamp which shines directly into the engine.
You move in the front of the tube a special demagnetizer, it's an expensive unit so only a shop has it. You will have to either call a repairman at home or take the tv to him.
Your TV needs demagnetizing. All tv repairmen have a demagnetizing coil to clear up the pictures on CRT tube televisions. It only takes about 10 seconds by waving the coil around and around in the front of the tube with the tv is on. Another possiblity (without my looking at the screen) is that there is a capacitor that filters the 200 volts to the socket of the tube that could be bad. However, it it is likely to need demagnetizing.
it need to demagnetize using a demagnetizer or permanent magnet (PM). move the PM to the center of the tv then rotate it ccw make a round small circle to bigger circle as you move the PM away from the screen. But do not put speaker near the tv. You can also switch off the tv for a night then turn on again this process will demanetize the screen automatically but be sure no speaker put near the tv. If this will not solve the problem. it might be the technician forgot to refix the degausing coil or Thermostat.
Its magnetic effect on picture tube. Power Off TV for 20-30 minutes then turn it On, hope problem will be resolved. Please also check and remove any speaker or some thing have magnet near by TV. If color spots are still there, picture tube need to degaussed / demagnetized.
sounds like it needs demagnetizing, also make shure you dont have any unshielded speaker close to the set, demagnetizing is performed with a demagnetizing coil, you can purchase one at any tv parts dealer for about 30dollars
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