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Color Patches/Spots on the screen

1.There are fixed Color Patches on the screen.I tried to use external de-magnetising(de-guassing) coil but they do not go away.How to get rid of them?

2.I need to have a remote control for this model.Which remote control would work?

3.Is it possible to get a circuit diagram of this TV ,Model# LG-CA21K52EX?

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  • Naweed A
    Naweed A Apr 01, 2008

    Dear Cybertech,

    Can you please elaborate what do u mean by "masc" ?



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IF YOU CAN get those spots out is a big chance that the masc in your picture tube is damaged and picture tube is more expensive than the tv

Posted on Apr 01, 2008


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Tv fell off stand. tv has vertical rainbow lines on right side of screen. how do I get rid of the lines?

Color patches due to strong shock or vibration cannot be eliminated by anyway, to CRT type TVs. Gopakumar Gopalan Google

May 10, 2014 | Proscan Televison & Video

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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.

Hope this helps.

Feb 11, 2011 | Televison & Video

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Color wont move off of mute to align

maybe the degausing coil is defective or your tv is de magnetise or the color control is defective. if no just consult your problem to APEX service center near you

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Yellow tint on right side of screen sony wega kdf-wf655

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.

Apr 27, 2010 | Insignia NS-27RTV 27" TV

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Permanent purple colour on left side of screen. Exaggerated purple color

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.

Jan 19, 2010 | Sanyo Televison & Video

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I have blue splotches appearring on my screen. Occurs also when playing dvd. How can i fix this?

I am assuming you are referring to irregular patches of color appearing in the display. The most likely cause is that the pic. tube and related hardware have become magnetized. The TV has a built in degaussing (de-magnetizing) system, but sometimes it is not enough, or is not functioning. You need a source of an alternating electromagnetic magnetic field. Technicians have a degaussing coil for this. I used to use a soldering gun and that would work if you have one. You would click it on about 4 feet from the set and then bring it closer to the screen while moving it in a circular motion. Keep the soldering gun a few inches from the screen and circling it around the perimeter. Gradually move it well away from the set before turning it off. I mention a soldering gun, but anything that provides a strong alternating field should work. You probably can buy a degaussing coil yet at Radio Shack. Go to youtube and enter "degaussing a TV". There are a few examples there, but the site was down as I write this. If this is not the issue there are other more serious problems internally. Good luck.

Nov 05, 2009 | Panasonic Televison & Video

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Color change

1. red colour on the screen , or redcolour missing. redpatchs on the screen. tell me.
(1). in case red colour on the screen red colour missing.change the vga male connector.

2. red patches on the screen external digosing use.

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Crt tv

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.

Jun 12, 2008 | Televison & Video

1 Answer

Purple hue on bottom of screen

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.

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