In my experience, this means that lightning has struck close to the tv. Sometimes you can take a magnet and try to pull the color off of the tv screen. Start on the inside of the discoloration, and move it toward the edge of the tv. This does not always work, but you might get lucky.
Hai,
That called ghosting or magnetic interference on CRT .
To eliminate ghosting, the easiest step is to keep the TV from equipment that has a large magnet. For example: speakers, electric motors and all that is magnetized.
Or you can also turn off the TV for 10-20 minutes to cool the PTC on the TV.
If it remains, try to move the location of the TV to other place.
i hope it will help you.
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