Question about Sony KV-24FV12 24" TV

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Switches off after 3 to 4 secs--little bright screen hor line and small retrace lines

Switches off after 3 to 4 secs-- little bright screen with horiz lines and small retrace lines.A dull image like ghsot image is visible on the screen.What might be the problem?

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  • Anonymous Aug 23, 2008

    Tv turns on and turns off

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On the my sony website, they said try unplugging the set for 3 or 6 minutes. Then plug it directly to the wall. If that don't work, and it won't; seek a service center. I have the same problem.

Next time we better buy Panasonic. Sony products fail ALOT. I had a 5 disc DVD Changer and it was defective and it was part of a class action lawsuit,

I believe this is the same sort of problem.

The sony Vaio laptop computer gets consistent poor reviews.

I brought an alarm clock and its back up battery never worked right out of the box.

I brought a cordless phone and the LCD display went blank.

I am so DONE with Sony.

Good name; Bad products.

Posted on Sep 18, 2008

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Samsung HiTron, CD50F2, high bright, flyback line white visible, menu text blurred


Check the screen voltage. Adjust it to a little lower and check. Check the supply voltage to its video output stage [CRT base card]. If this voltage is less than normal, this kind of fault can occur. Check the smoothing capacitor [the electrolytic capacitor of low capacitance value] is bad. If it is bad, the voltage stated above will go low,and the retrace lines will be visible. Check these.
The fault you now see is technically called vertical retrace lines with picture. The above said are the main causes for this.
If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience.
http://electronicshelponline.blogspot.com/ Pull up older posts.

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Are the lines in one collor then check the circuit of theat collor

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If retrace lines are across entire screen---likely the master screen control on the Flyback is set too high--causes excessive brightness and the retrace lines.

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When ever there is some strong white on the screen it gets distored. For example. There was a white tent on screen and where the light was hitting it it was extremely pixelated and distorted. Ny ideas?


Hello
This fault can occur to mainly three reasons. ABL circuit failure. Low screen voltage or lack of emission from picture tube cathode. Just advance the screen voltage to a little, and observe the result. Screen control can be located on its Line Output Transformer [LOT]. there will be two variable controls built on to LOT marked as screen and focus. Screen control will be at lower side, and focus will bw on the top. Just advance [clockwise movemnt] to a little, not more, advance it till retrace lines are just visible on the screen. Before doing this, set all the picture controls, contrast, colour and brightness of the TV to zero. Once the retrace lines[thin horozontal white lines across the entire screen at about 1 inch distance with each other]; are visible, stop there, turn the screen control counterclockwise to just a point when these lines are just goes off. make this adjustment in a dark room so that you can set this point very correct. After this check the perfomance of the picture. If this does not help you, ABL circuit should be checked for any fault.
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At first it was lots of horizontal lines over the screen, and later TV screen went completely black. The sound still is perfect. Perhaps I just need to replace the fuse? I love this TV! Thanks...


Hello
You have stated that your TV has a lot of horizontal lines before it went off picture. We say that lines as retrace lines. So many of them will there on the entire screen, at about one inch or so apart, horizontaly scattered along with picuture. At that time, you may be unable to down the brightness control also. Even though you have reduced the brightness control to zero position, there will be some brightness level on the screen. You should have to repair that fault at the begining. There is a voltage going to the picture tube base, known as screen voltage. That voltage determine the emission of the picture tube, and we call it a bias voltage. When it goes higher than normal, this trouble ie retrace lines will occur. In long run it may spoil the picture tube itself. I don't know what the case of yours.
Anyway it is best for you to consult an experience technician in this case. Ok.

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Hello, please check the 10uf/200V capacitor around flyback transformer. Best regards, Arpi

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