Question about Standard (CRT) Televisions

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How do i demagnatise my color screen

Color all messed up by a magnet

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  • kazdack Nov 13, 2008

    My son decided to place his magent onto our TV screen this morning and was amazed by all the pretty colours that it generated! He was so impressed he moved the magnet all over the screen!!!



    We're now left looking at purple people ........ can you help??



    Karen (London)

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HI ,you have to purchase a DEGAUSSING COIL , item can be found in one of the major AUCTION SITE , they can cost you around $20.00 / less or more . once you have item ,hopefully the instructions will be included , but basically what you do is to put the DEGAUSSING COIL in front of the screen and do circular motions where area affected and slowly move away from the screen until the spot disappears. hope it helps

Posted on Apr 19, 2008

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1 Answer

What caused my TV to suddenly have pink and green areas on the screen?


Hello
For every standard televisions, there will have a degaussing posistor, to demagnatise the picture tube, each time it is switched ON. If thie degaussing posistor has damaged, there will be no degaussing action and color patches on screen will be the relsult.
Moreover, check whether there is any external speaker boxes have placed near the Tv. The magnetic effect from the magent of the speaker can also cause this.
Posistors sre of severel types, and the pictures of some of them are given here.
2_8_2012_4_10_49_pm.jpg2_8_2012_4_11_21_pm.jpg2_8_2012_4_11_47_pm.jpg

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1 Answer

Color problem


It sounds like the set has become magnetized. It could possibly be from an external speaker magnet or some other magnetic field (ie. a vacuum motor). It could also be a malfunction in the built in demagnetizer circuit. Color picture tubes are very sensitive to magnetism. Because of this there is a built in demagnetizer circuit. If this circuit malfunctions it can cause the same problem. Turn the set off and unplug it for 30 minutes or so. This will allow the circuit to cool off and reset. Turn the set back on and see if it returns to normal. Also, dropping the set or a heavy jar can warp the shadow mask inside the tube causing the same problem. If the unplugging method does not work, have a shop check it for you. Thanks for using fixya.

Mar 02, 2010 | Panasonic Standard (CRT) Televisions

1 Answer

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Magnetized The set is probably magnetized and needs degaussing (demagnetizing).
All CRT type TV's have an internal demagnetizing circuit that is engaged when the set is first turned on after being off for the day.
If this circuit is working then you sometimes hear a "bonk" sound (about 1/2 a second long when the set is first turned on. If this circuit isn't working the set will become magnetized over time and will have to be degaussed using a degauss coil available at a TV repair shop (cost aprox. $35.00) and you should have the circuit checked at the same time. A set will also become magnetized if a large speaker (magnet) or motor is close to the TV. Be sure to vote/rate me if this helped Thanks!

Oct 26, 2009 | RCA F27TF720 27" TV

1 Answer

I have an RCA 36 inch tv, the color is messed up, it has a round circle and it will not change channels


If the set wasn't dropped or physically dammaged the chances of it being the picture tube is very small.
The set is probably magnetized and needs degaussing (demagnetizing).
All CRT type TV's have an internal demagnetizing circuit that is engaged when the set is first turned on after being off for the day.
If this circuit is working then you sometimes hear a "bonk" sound (about 1/2 a second long when the set is first turned on. If this circuit isn't working the set will become magnetized over time and will have to be degaussed using a degauss coil available at a TV repair shop (cost aprox. $35.00) and you should have the circuit checked at the same time. A set will also become magnetized if a large speaker (magnet) or motor is close to the TV. Be sure to vote/rate me if this helped Thanks!

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1 Answer

I have a rainbow of color about the screen. The TV fell out of the stand and now the color pattern is messed up. It fell face down.


sounds like a degaussing (magnetizing) problem.could be that the posistor inside the TV set got loose when the tv fell down. If you have experience soldering electronic components, you should be able to fix it by re-soldering. Otherwise, call a tv tech to do it.

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1 Answer

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the deguasser in your tv may not be working right..or the magnets in the corner of your tv has moved....it can be manually deguassed but a tv shop would have to do it..

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2 Answers

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if ur tv is CRT (picture tube) just power OFF it for 20-30 minutes and then power up again. problem will be solved.

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1 Answer

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Dickson do you have a speaker next to your tv anything magnet will change color it may need demagnatised

Maxol your tv more then likely has a bad picture tube or you have a shorted transistor for green output shorted on CRT board.

ThankYou for using FixYa. Have a Nice Day.

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1 Answer

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what you are describing is a degaussing problem. It normally occurs if some Magnetic source has been brought close to your TV. Perhaps you have shifted your TV from part of the room to another? Or to another room? Did you or someone place a magnetic source (Speakers, Tape recorder, Walkie talkie, some toy of your children, etc near or on top of the TV? Just remove it. And wait for a few days. The problem will get automatically cleared up, as the TV set's Auto Degaussing circuits will clear the color patches.

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