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Hi, this sounds like your TV needs De-Gaussing, the screen has become magnetised and the electrons being fired at the screen are being diverted or scattered and mixed to the area's that are magnetised creating the odd colours, what you need is a de-gaussing coil, you can wave this in a pattern to de-magnetise the screen thus allowing the electrons to flow properly to the screen, it may also be the PTC on the tv's PCB near the mains input, if this is faulty the tv's own degaussing coil may not operate properly, you local TV technician maybe able to help with this as the part is specific to the TV, they maybe able to degauss it too for a small fee.
Here's a better expaliation ---> CLICK HERE <---- it shows a circular pattern here but there are many kinds of pattern magnetism can create but the colours are nearly always the same just in different places witn different strengths.
Tube got magnetised. Re orient the TV in a different direction entirely opposite. Switch on TV, Switch Off. wait for 30 minutes. Again Switch on. Repeat at this interval. The auto de-gausing circuit will de-magnetise it.
Otherwise you have to degause it externally. Contact service center.
This is a common problem and is due to a fault with the screen's colour purity.
It can be caused by poor tv tube design, poor tv construction or poor component selection, but is more commonly caused by either the tv suffering a physical shock or if it has become magnetised due to having powerful loudspeakers within a few feet of the screen. Lightning can also cause the effect if close and powerful, but it doesn't have to strike the ground. Another cause is distortion, displacement or other faults with internal masks within the tv tube itself and these are not fixable but can sometimes be overcome by applying small external magnets to the neck of the tv tube.
The only DIY fixes are to remove any external unshielded magnetic sources such as loudspeakers (powerful loudspeakers need to ideally be no closer than six feet and preferably at least four feet away) and to try and demagnetise your tv. You can do the latter by turning the tv off (not just on standby: disconnect the power completely) for at least thirty minutes and then turn it on again for at least a minute. Repeat a couple of times to allow the tv's in-built de-gausser (de-magnetiser) to work.
If this doesn't work, the tv will need to go to a repair shop where they can use a professional de-gaussing tool and may also decide to make adjustments or additions to the purity magnets at the rear of the tv tube. A good tv technician can usually fix or at least improve the appearance of your screen and should be able to tell you whether the tv tube is not worth repairing. Solving difficult purity issues needs to be done at a tv repair workshop as it's one of those jobs which doesn't actually take long in terms of the amount of labour, but it's a job where the labour is perhaps a few minutes an hour spread over a day or two.
Modern plasma and LCD tv's work on totally different principles and do not suffer the same fault.
Fingers crossed that you fix your fault via the simple DIY method. Either way, I hope that you've found my posting to be of use and all I ask in return is for you to rate my answer.
This sound very simple. You might need to DEGOUES your tv. Try to find a small degouesing coil at a parts store. This will take 2 seconds to fix. Just plug in the coil and wave it in front of the screen, pull it away from the screen, and it is fixed.
You may have placed something with magnets near the bottom of the TV screen. Magnets will distort the electron beam in their vicinity. Move whatever you have there!
"de- gaussing" is the process of de- magnetising the shadow mask in the tube, it occurs automatically at switchon.
If removing magnets/ relocating TV / switching on and off does not fix the problem, it's time for professional intervention.
My son touched my television screen with a magnet in two spots leaving two discolored areas on the screen,purple and green in hue. I read many quick solutions to this problem on the net and none seemed to work completely,so what i did is took the same magnet that touched the screen and held it in my fist,then with TV on i waved my fist all around the screen working from the spots outward to the edges and this worked completely! Hope this helps someone..