Question about Philips 20PT643R 20" TV

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Picture Tube Failing


I've scoured the internet and have finally settled on submitting my issues in hopes of understanding my problem and maybe finding a solution. I own the below mentioned TV had have for at least 2-3 years, manufacture date on back is August 2004.

About 6 months ago I started to notice discoloration on the right side of the screen running vertically (red). Eventually on the Left side as well (green). I know this is a picture tube issue. Very small fridge magnets seem to help fix the picture slightly (and temporarily) when ran across the effected area. The set has never been dropped or otherwise mishandled. I don't believe any items near it would generate any kind of interference either.

I have continued to watch DVDs and play games on it with some mild visual discomfort. I just dealt with the issue until now. Occasionally the visual flickers slightly and seems to be adjusting itself, as if it was degaussing but then goes back to the discolored visual.

I guess I'm curious what could have caused this and if there is really anything that could be done to try and troubleshoot this issue before giving up on this set.


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I t sound like the De-gauss circuit has failed.
De-gauss demagnetizes the TV tube so you dont get what youre seeing.
It could be something as simple as a solder joint on one of the parts in that circuit. I fixed my Panasonic that way

Posted on Jan 27, 2009


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