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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)

Posted by dan chies on

  • dan chies Jul 01, 2006

    Yes , judging from the postings this seems a common failure mode.
    Yes it's OLD but still(used to :-) work perfectly...although Certainly not worth spending $$ on given the current replacement cost.
    Do know which end of the iron to hold..but not a tech.. where should I start looking for a failed joint.. at degauss coil ends or somewhere onna board? err.. which board :-)

  • dan chies Jul 13, 2006

    Well.. I tried manually 'Degaussing'.. Watched the Colours shift slightly as the Coil worked :-) But it did nothing at all to 'fix' the problem.
    After a couple of days the colours all returned to normal.. all by itself.
    Presumably that was some kind of death knell, but it's working 'as new'.. still :-)



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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

  • Anonymous Jul 02, 2006

    If you know where the plug to the coil ius just start resoldering with the plug out of the wall , everything on the two sides of the plug on the underside of the PCB. Now there might depending on the exact model, a black cube thats conncted to one side of the deguassing coil. If the resoldering dosent help then thats bad too. Be care full man as I said theres alot of HI volltage inside these sets. The part # for the thermistor is 1-809-744-11.
    Good luck.



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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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sounds like you have colour impurity problems caused by a magnetic feild being near the Screen. Fist check for any new magnetic feilds nearby. If there have been no new changes, it may also be a faulty PTC device that automatically degausses the tube. When they fail, you will get problems with impurities by way of coloured spots on the screen.
Try disconnecting the set off at the wall for 30 mins, this will initiates the auto degauss process. If all is ok, the spots will be gone. If not, you will need to have someone handy with a soldering iron that is also familiar with TV repair to replace the PTC 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.

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check to see if you do not have speakers on the side of your tv or any where around it.which could be causing your problem.
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