Question about Sony KV-27S20 27" TV

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Weird colours all of a sudden

My Sony just tonite turned on with shifted coulours.. looks almost like some magnet effects but none was near it.. otherwise works fine except people are mauve.. No control inputs make any diffrence at all. Is this fixable or is it dead (bought it in '91)

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Re: Weird colours all of a sudden

These sets sometime have a fault with the auto degaussing circuit. It will start to work and because of a bad solder connection, the unit shuts off the degaussing right in the middle of it cycle and cause a rainbow effect of color. Your gonna have to go in and trouble shoot the degaussing circuit my freind, BUT if your not a tech I highly advise against this as theres alot of high voltage inside these sets. Have it checked out by a service person. It really depense on you if its worth it. Personally, myself, I wouldnt invest a dime in a 15 year old set. Good Luck

Posted on Jul 01, 2006

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It sounds that there is some magnet near by TV that is affecting picture tube. Please remove any extra speaker or any thing that has strong magnet inside, unplug TV for 20-30 minutes, replug back in, turn it ON, hope that will solve your TV problem.

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May be PURITY on the tube, an effect of older CRT tubes caused by a build up of magnetism around the screen, easilt cured with what is known as a magic wand. An electrical wand that produces a magnetic field and is waved in front of the screen to de-magnetise it.
Ant TV engineer can do this for you.

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Discoloration of this sort is caused by magnetism. All CRT TVs (like yours) have a de-gaussing coil around the picture tube that de-magnetizes the screen (more specifically the shadow mask) every time you turn it on. It is likely that the circuit that controls this coil is at fault. There is probably a cold solder joint where it connects to the main circuit board.

The other scenario is that someone (small child generally) has run a magnetic object very near to the screen, magnetizing the shadow mask (inside the picture tube) and causing a rainbow effect. This is less likely if the rainbow effect is a nice even circular shape. Generally if it's been magnetized by a magnet as described the discolored areas will appear blotchy.

In short, if you have some electronics skills, get in there with your soldering iron and touch up the connections to the de-gaussing coil. If not, find someone who does.

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1 Answer

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Maybe you put magnet near to your TV or something that can produce magnetism.... if not the deguassing system is not functioning anymore. .. bring your unit to near service in your place.

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Are you getting Green or purple or pink patches all over the screen?
This could be a problem of Degaussing. Have you placed any Magnetic source near the TV recently? Some Tape recorder or walkie talkie or a Speaker, etc? The Magnetic field created by any of the above sources can cause coloured patches over a colour TV screen.
It also happens if you shift the TV from one location to another.

The third possibility is that the Picture Tube's Red Output stage gone faulty. Unless you are a trained Solid state Electronics Technician, there is nothing you can do. Better go for a trade in.

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If it is in one of the corners it is a magnetic interferece problem. Most '90s and later sony tvs have a built in degaussing. Turn the tv off and turn in back on and it will degauss. If you have speakers too close move them away. If you have the tv on and move the speaker away you can see the effect.

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your problem is simple it is called colour patch. it is basically due to change in direction or you must have shifted or tilted. it might be due to magnetic effect like spkr,telephone near by it.just remove from that location. put of the set for 15 minutes &put it on .problem will get clear. ask tv tech. to degauss it by hardly 1 second job. regards

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