Question about Sony KV-32XBR250 TV

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KV-32XBR250 Has about twenty Horizontal, Light Red bars aternating

When we are watching high intensity colourful background images these light red bars are not noticable. When the image mainly light these light red alternating bars are more noticable. This started just a week ago. Thanks for you help.

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Your problem is called retrace lines it is due to 1 supply to red out put is absent 2 problem in red video output 3 loose contact in red output ckt 4 connector loose 5 crt base loose 6 circuit from red output of chroma ic to red video input 7 chroma ic defective regards

Posted on Sep 12, 2007


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Posted on Jan 02, 2017


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Hello maymet,

This sounds like the HV protection circuit is cutting off the TV due to a high current event in the set. This could be a problem in the High Voltage section of your TV (Horizontal output transistor, Integrated High Voltage Transformer, and y of the deflection components, and or the CRT in cases of shorts).

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Since I can't see your screen, I'll guess.

If the picture shrinks away in the vertical, fast or slow, it is in the vertical control circuit.

If the whole picture shrinks in both axes simultaneously, the high voltage circuit is the culprit.
This section is responsible for producing the accelerating voltage for the beam so if it is dropping out (quite common after years of use) there will be nothing to speed the beam to the phosphor to produce light.

Turn up the intensity when the picture drops out to see if you have any trace of light.
If not, it is the latter problem.

If you can still see a horizontal line that flickers a little (from video content) then it is the first problem described.

IF the flyback (HV) transformer is still available, it will cost somewhere between $25-$100 US (many lower cost sources have disappeared) plus labor.
Depending on whether the fault was the flyback or the high power transistor that drives it, there could be additional parts needed.

Since you indicated that it operates OK for a while, it could also be something as primitive as a failed solder joint and these can be tough to find (=$$ labor).

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This mogiht be a problem in the High Voltage power supply. Or the Horizontal output section of the TV. I would start off by checking the Horizontal Output Transistor and the using a high voltage probe check the CRT anode voltage to make sure it is proper. If you do not have a background in electronics I would not suggest that you attempt to work on this set. 

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Something shorted and shut your set down. Most likely the high voltage transformer shorted which also shorted the horizontal output transistor. Stargazer

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