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Colour Problem with ONN crt TV

I have a cheap TV from Asda, not very old, problem is that when placed in different areas of the room the picture colours up either pink or green in patches, it is very noticeable on the "blue" AV screen. In all other respects not bad for the money, but it really is a problem

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  • jayhove08 Mar 23, 2009

    i have a samsung dlp. still under 1 year old and sometimes the picture goes pink and green. i power it off and it takes it a while to turn back on and makes a constant high pitch noise until it turns back on completely. wondering if anyone might know what the problem may be?


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TV's will show funny colors because of magnetic fields affecting the face of the picture tube. A "degaussing" circuit (a coil of wire around the tube and some kind of control circuit) is supposed to try to neutralize this when you turn the set on. Sounds like it's not working correctly in your TV, or may not be strong enough to counter the field.

A real cheap set may have no degaussing at all, or may have a manual degauss button on the back. Does the owner's manual tell you anything? The connector from the coil to the circuit board may be loose. Try reseating it. (Be careful if you take the back off your TV. Make sure it's unplugged, and be aware some parts - especially the picture tube - can store a charge for a while after the set's off and can give you a nasty jolt.) It's also possible the tube is defective, but unlikely unless the set was dropped or exposed to a large magnetic field (like kids playing with a magnet near the face, or turning off a vacuum cleaner right in front of the set).

Hand-held external degaussing coils are available (check eBay). But without seeing exactly how bad the color is under what conditions it's tough to say what's best to try.

Posted on Jun 30, 2008

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This is for the same problem of samsung DLP. The problem is totally different from the answers above as DLP's do not require degaussing and do not have anything to with magnitism or degausing coils. DLP's have color wheels or optical color modules with LCD inside for color. Samsung uses color wheel. The noise confirms that your color wheel is bad and about to fail which will lead to set not coming on. This needs professional help. Check out at for more FAQs and price quotes.

Posted on Feb 21, 2010

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Hold and press subcode on your remote control until a factory menu appears. Scroll down using the arrow keys and select the reset option.

Then simply tune in your channels.

Posted on Mar 20, 2009

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Signs of a CRT going old, are bad focussing, unnatural colours and hues of a certain colour (red, green, or blue) if you watch black/white pictures. In colour pictures, black sequences also show hue.

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I have a 4 year old WEGA Trinitron HD TV (model # KV- 30HS420) that over the last few months has been switching between full color and color missing green colorations. Most of the time now the full colour...

A good TV repair shop should be able to repair this but given the current price of flat panel TV's you might want to think about scrapping it.
I was a little confused about your description of the fault, one colour disappearing is in a very different area of fault from all colour disappearing. Does it flash into correct colour momentarily if you fine tune it? Is the picture as far as you can tell black and white or does it have a strong colour cast on it where everything is for example reddy or bluish etc?
I hope I have been of help but please do not hesitate to ask if you have any further questions.
I appreciate your vote if you appreciate my reply.

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My tv is 5 years old, I smelt a burning smell in the room. The tv turns on then you hear some buzzing and crackling and the tv turns off by its self. the picture does not come on at all

Some component has failed inside. Buy something better or pick up another CRT set real cheap. Many people are trying to get rid of them after buying flat panel sets. Not work fixing anymore.

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Tilted picture

You must be placing the TV near something Magnetic, Speakers, etc. This would account for the green in the corners. The tilted picture is most likely the yoke in the set has moved during rough handling. The first issue can be fixed with a degausssing coil, the second requires a technician to manually realign the yoke assebly and perform a convergence on the set.

Apr 20, 2009 | RCA TruFlat 27F520T 27" TV

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Jun 29, 2008 | Televison & Video

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Colour interestingly different!

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Dec 22, 2007 | Toshiba 28N33 28" TV

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Bad picuter/color quality

Your problem sounds like it has to do with beam landing, or purity.
In a CRT type tv such as yours this can have many causes, some of which I'll describe.
- The CRT (picture tube) is magnetized, possibly by speakers being placed too close to the tv. Turning off an item such as a vacuum cleaner in close proximity to the tv can also cause the crt to become magnetized.
- The auto demagnetizing circuit has malfunctioned and requires a tech to repair
- The CRT has developed an internal fault and would need to be diagnosed/replaced. This is not worth the cost of repair.
- The yoke and/or beam landing magnets have become loose or faulty. This is internal and would require a tech to confirm or repair.

The only fault which you may be able to fix is if the crt has become magnetized. Check for sources of magnetism close to the tv. That would be such things as speakers or anything with a permanent unshielded magnet. TV's with CRTs have a circuit which demagnetizes the crt at each cold start. Turn the tv off and leave it off for 3 hours and then start it. If the crt is too magnetized or there is a problem with that circuit this may not work. You can also try a different placement, the ideal being the front of the screen pointing either directly north or south.

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So long as your reception is good, sounds like colour- killer circuitry or something that is killing the colour burst pulse.
Oh well, small TV's are pretty cheap now!

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