Question about Sony KP-53HS20 TV

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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. Amy

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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.

Posted on Feb 11, 2007

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Standard television spot after bright screen

A explanation that may tell you what is happening:

Some of their sets had this issue. The picture tube has a metal screen inside directly behind the stripes that make up the phosphor coating on the inside of the picture tube.

It is called a shadow mask. It has perforations that line up with all the stripes on the screen (look close--red-green-blue stripes all outlined in black--tiny).

What is wrong is not fixable even if the tube is replaced----the metal used in these sets for the mask contains iron which causes it to expand in areas with real bright scene changes--

No need to remove question as I saw it and answer questions for most TV area problems.

I actually ten years ago worked for Circuit City--saw at least 5 sets (all larger Toshiba sets) with this issue. On seeing first one called our support staff and someone explained to me the issue---that set was under extended warranty and since the customer was angry the set was "exchanged" for a brand new set and the old one was disposed of.

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keep tv off.
it will only get wors
if sumon dosent work on it soon
the problem you are having in the vertical section of the tv
hav a repairman resolider all conection on the vertical IC and check the serounding componets for falts.

regards daniel.
PS the repair takes me about 15 min.

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1 Answer

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the problem, lies on the flyback ,, on the flyback there two adjustment, the screen and focus that was writtten , adjust only the screen slowly untill screen of your tv back to normal.....fading because over saturation of voltage, adjust the screen trimmer counterclocwise....

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No picture

a bright thin line in centre is called horizontal line. first of all do not keep tv on unless it is rectified. BUT If you want to put on tv keep brightness minimum to protect your screen for any demage. now solution your problem is in vertical section. 1 check vertical supply. 2 check parts in vertical section or loose contact. 3 yoke connrctor loose 4 ic defective It is not serious problem can be rectified easily

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4 Answers


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With it only being about 3 years old, I would suspect bad solder connections rather than defective components like Capacitors. You may get the symptoms to come and go by slapping the side of the set or jaring it slightly which would prove the bad connection thesis. It is not a permanent cure however and you can make it worse if you keep doing that. A solder repair shouldn't run over $225 in my opinion.

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1 Answer


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

Feb 13, 2007 | Sony KP-53HS20 TV

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