Question about Sony KV-27S20 27" TV

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Sony 36" tube TV

When I turn the TV on the sound is OK but it does not have video. There is a blank light on one side of the screen, but disappear inmediatelly. Until last week ago I used to fix it and have video just by turning it off, wait some seconds and turn it on again. Some times worked after two or three times turning off, sometimes I had to turn off and on around ten times. I allways had to wait around at least five seconds to have video when working. After the video was on, the TV was fine in general, but sometimes when watching TV the video went off, I tried again by turning it off and come back to normality. All the time and also now the red timer light blinks. In the last weeks the video went off more frequently until it never turn on. I bought the TV aroung 6 years ago and I started to have the problem around 4 years ago. I took it twice to technicians when the video was off more frequently. In both cases they said that they did not find anything wrong, they cleaned, they moved the connections, and the TV started more stable for some weeks. One of them told that I had to change the Tube (??), but I understand the tube is still working , otherwise the video will never work. What do I do? I review the TV and nothing inside looks burned.

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Re: Sony 36" tube TV

It definitely does not seem to be a problem with the Picture Tube. More like a cold solder. It is definitley not a job for a layman. Also, get a good technician to have a look, as locating cold solders is a labourous and time consuming process. It could also be possible that the main DC filter capacitor is getting dry, and may require replacement.

Posted on Aug 15, 2006

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I have a Sony Trinitron about 7 yrs old. The picture is flashing on and off. The sound is constant. The flashing was happening about the first 5-10 minutes after turning it on then it would stop. Now its...

Hi there
Sorry to be the one to have tell you that but yes your tube is dying.
In sony tv`s the video(picture) is off until the tube has warmed up and now that it is getting weaker it has difficulty reaching the point where it will bring out the video.
If you want to clear that problem for a while , you can open the back of the set.
You will see a round transformer(flyback) with two controls on it and a thick red wire that connects to the back of the tube.
With the tv on turn the lower control up slowly , you`ll see the brilliance go up and that will help with the flashing picture for a while.
If you see lines across the picture when you adjust that control it is because you have reach the max the tube can take , just turn it back down until they disappear .
Hope this help have fun

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Attempted to turn the tv on, screen stayed blank with no volume either and standby light blinks 16 times.

High voltage is dead,FBT,flyback transformer the cause.The big block of plastic with a red wire with a cap hook to a CRT(tv tube).

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Try unplugging for 36 hours. I had the same problem but with no sound and picture

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Something is Wrong with the Video.Check Video out,Q705,732,761 and other components on the C board,c also check Q218,219,220 on the A board.In addition,unit could be in IK blanking,try turning up Screen Slightly

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Most commonly, the power supply, and or scan failure causes this. There may be some bad caps, in these areas. In the horizontal output area, the flyback and the horizontal output transistor may also be defective. There may also be some damage to the power supply in this case.

Jerry G.

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I suspect you crt tube is going and is most likely not worth fixing

There are things you could do a tv service shop could rejuve your picture tube and adjust your screen voltage.

sometimes that does not work

I would start looking for another tv

thanks doctor video

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My tv video is turn off but sounds perfect

donot quickly replaced the tube! try this first get 2 megohms 1/2w resistor solder it between blue gun and green gun.if this make the picture still, bad tube.u can still rejuvinate it.if not,bad capacitor in vertical or bad g2(screen) adjuster.

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