Question about Sony KP-53HS20 TV

FADING TO BLUE SCREEN

My television is about 5 years old and is now not working properly. The screen will be fine as soon as you turn it on but as soon as you leave it on for 5 minutes it starts fading into a bluish color and eventually the whole screen is a very bright blue color and you can't see anything. If I turn it off and leave it for a couple seconds and then turn it back on it will be fine for about 5 more minutes and then the same thing will happen again. Any ideas of what is wrong or how to fix this? Do I have to get a new TV? Any help is greatly appreciated. Con't : Is this something I can try to troubleshoot myself? Is it worth trying to get fixed cost wise or should I just buy another one? Amy

1 Answer

Simpson Neal

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236 Answers

Sounds like you have a problem with the blue gun in your picture tube or its drive circuit. You might remove the back cover and gently tap on the neck of the picture tube using a plastic screwdriver handle while watching the screen in a mirrow. If the picture flashes back on or on and off then the picture tube is the problem. If this is a projection tv you have three separate tubes : red, green & blue. you'd need to tap the blut one.Gently!!!! Stargazer

Posted on Feb 17, 2007

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I'm about 90% sure it is the blue picture tube developing an intermittent heater to cathode short. I'm surprised the set isn't shutting down shortly after this happens. A service call will tell you for sure as it could also be a bad solder connection causing a similar symptom. My own procedure to check it out would be to GENTLY tap the neck of the suspected picture tube with a screwdriver handle to see if I could get it to come and go (Or get out my CRT tester and measure it with the power off). Obviously by holding the screwdriver blade you don't want to accidently short anything out as there is about 33,000 volts a few inches away from where I would be tapping. Nuff Said.

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