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Degaussing problem Hi can you please tell me if degaussing a Sansui SV2918 TV does not help, what else could be wrong. Could it be the croma or demodultor in the main IC. The colors come wright if you degausse it with a coil. But if you turn the tv of for a while and you turn it on again the colors is smeared again. Mainly green. Thank you

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There is an automatic de-gaussing circuit within the TV and it's likely to be the culprit. When the set is first turned on (before you even see a picture) this circuit is active and as it warms up, a thermistor opens up and stops the circuit from operating. It does this because as it heats up it's resistance rises and the circuit stops the current flowing through the de-gaussing coil. Over time from the heat/cool cycle, the connections to the circuit board fail. Simply re-soldering the thermistor is probabaly all that's needed.

Posted on Oct 09, 2008

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How can i troubleshoot a crt tv with colour problem.


Hi Ibrahim, the links below are youtube videos showing how to fix your television, The item that's waved in front of the television is called a degaussing coil, I hope this helps........CHEERS..
Fix your own CRT Television Color Problem

Fixing Purity Error on CRTs with Degaussing Coil

Arcade Repair Tips Using Degaussing Coil


May 12, 2016 | Televison & Video

1 Answer

The pictures on my Sony TV are all of a sudden outlined in hot pink and lime green. Any ideas what is wrong?


possible defect is the degaussing resistor,degaussing coil,and crt purity.try to check this 3 components.

Feb 26, 2015 | Sony Televison & Video

1 Answer

Magnet came in contact blue green and red color


Every time you turn on a color TV, a degaussing circuit tries to neutralize magnetic fields on the picture tube face that can cause distorted colors. That degaussing circuit isn't strong enough to clear up the field left by direct contact with a magnet. You need an external degaussing ring to clear up the funny colors. You can see what one looks like here. You might be able to find one for sale on eBay or borrow one from someone in the TV service business. Or you can take the TV to a shop where they can degauss it for you for a small charge. Just be aware there's a chance the picture tube may have been damaged if the magnet was very strong and was in contact with the tube for any length of time. A thin metal screen called the shadow mask is behind the tube face, and if that was warped by the magnet then the colors will never line up correctly again. If this has happened, even after degaussing the colors will still be wrong. But you won't know until you try. Good luck, and thanks for using Fixya!

Jun 02, 2011 | Daewoo DTQ-27S5FC 27" TV

2 Answers

When i turn on my tv, the screen has like rainbow color all over it. i found out if you hold a magnet up to the screen, the color moves if you move the magnet. no picture of anything,,just color i...


To fix this, you need to do something called degaussing. You should keep magnets away from the screen in the future, because they cause this problem.
The first thing to try is to turn it on and off, making sure that all magnets and speakers (which have magnets in them) are kept far away from it. This will activate the monitor's auto-degausser if it has one. If this does not help, this guide: http://www.wikihow.com/Degauss-a-Computer-Monitor gives a couple solutions, including using a soldering gun (not a soldering iron), illustrated in the video below:
With a powerdrill:

Or investing about 60 bucks in a degaussing coil like this which is a guaranteed fix:
One other trick that might work is to take an old CRT monitor ("fat-screen" rather than "flat-screen"), hold it up to the tv screen to screen, and turn it on and off to have the monitor use its own degausser. The monitor may have a button to activate degaussing, or it may be in the menu you can bring up with the buttons on the bottom of the screen.
If you don't want to deal with any of this, a tv repair shop will degauss your tv for you quickly.

Feb 28, 2011 | Philips Magnavox 27MS343S 27" TV

2 Answers

We have a panasonic ct-36d31e that has developed a degaussing problem now. Rainbow colors - magnets haven't helped neither has power drill placed near the screen. Is there a degauss button on this model...


Hi Tracy,
Unfortunately magnets etc will most likely do all but improve the problem. When a T.V set is turned on it automatically degausses (demagnetises) the tube. However, if the screen does not degauss, its most likely a small electronic component in the degaussing circuit which has burnt out. This component is usually black in color, is rectangular and about the size of of the T.V. screen displayed alongside your question. Its inexpensive to replace(less than $5) and can be found at most electronic component stores.
Please let me know if I can be of any further assistance.
Best wishes,
Graemevm

Dec 23, 2009 | Panasonic CT-36D31 36" TV

1 Answer

Sansui picture is fluorescent ping purple green, etc. Worked fine yesterday.


HELLO

By the sound of this you have a degaussing problem! I think what has happened here is the degauss circuit has failed and the usual cause is the POSISTOR.

What you should try to do is switch the TV on, then OFF again and leave it for 30 mins before switching on again. When you have done this and the problem is no better, then contact a service centre who will cure the fault for you.

Alternatively, try to borrow a DEGAUSS COIL and with the set on, switch the coil on and by using a circular motion go around the screen of the TV moving backward slowly as you do it. When you are say 6 feet away from the screen switch the degauss coil off.

HOPE THIS HAS HELPED YOU (:-)

Nov 07, 2009 | Sansui DTV2760 27" TV

1 Answer

Magnavox 20mt4405/17 piece of junk!


Hello sletak, This problem is actually common. Your degaussing coil has malfunctioned, causing the power supply to become unstable which in trun is effecting the memory settings in the processor. You have threen problems in one so lets start by looking at the overall cause first 1) degaussing coil going bad (shorted then opened) Replace this and the thermistor that is attached to the degaussing circuitry. 2) power supply instability (power surge from the degaussing circuit) replace the damaged components in the power supply section. Troubleshoot this thoroughly. 3) after fixing the power supply and the degaussing components you will need to manually degauss the TV and then use the auto-degaussing function to do the rest. I hope this helps, Thank you, Shuttle83 http://www.electron-age-technologies-llc.com

Jun 10, 2009 | Philips Magnavox 20MS233S 20" TV

2 Answers

Sansui tv sv2918


replace vert IC301, C432, ( D431 & R431 should also be blown)

Jun 18, 2008 | SansuiM1315 TV

2 Answers

Screen Colours incorrect


Your CRT (Picture Tube) screen mask has become magnetized. You need to degauss the CRT. Have you moved you TV lately or at any point had speaker sitting next to it? These are two things that can magnetize the screen mask. Well in any event you will need what is called a degaussing coil to demagnetize the CRT.

Here is the degaussing procedure:

Standing about 10 feet from the TV Screen turn on the degaussing coil which is in a vertical position and rotate it in a circular motion walking towards the TV .

Once about .5 to 1 inch from the TV continue to rotate the degaussing coil and the move away from the TV while still rotating the coil.

Once at the point where you began, position  the coil to a horizontal plane and quickly move the coil back about two feet and the turn the coil off.

This will deguass the CRT.

Thank you,
Shuttle83

Oct 30, 2007 | Sony KV-36FS16 36" TV

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