Question about Sony FD Trinitron WEGA KV-32FS120 32" TV

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Half screen picture

When I turn on the tv , I only get a half screen. The bottom part of the screen only appears, top part remains dark

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This is commonly caused by failing capacitors in the vertical deflection amp area and sometimes with the output drive devices.

An experienced TV tech can troubleshoot your set and service it for you.


Jerry G.

Posted on May 25, 2008

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I looked at your screen shot of the symptom you are experiencing and it would appear that the very bottom and possibly the next one up CCFL (cold Cathode Florescent Lamp(s)) could be in trouble. If the inverter board(s) was bad the tv would just shut down and blink 4 times but seeing the tv operational but just a dark area near the bottom I would have to say you need to investigate the CCFL problem and replace the affected lamps.
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hi, usually you can correct this issue with only a few system checks, dark streaks can be caused by damaged pixels on the screen, in which case you need to replace the TV.
  • Inspect where the dark streaks are on the television. If the streaks occur at the same place on the top and bottom of the screen, they are due to the formatting of a movie or television show you are watching. This is normal. Also, if the streaks appear on the left and right of the screen, they are due to the show being filmed in full-screen instead of wide-screen. This also is normal.

  • Change the input setting so you are viewing the contents of a different device. If the dark streaks are gone, you know they are due to the device connected to it. However, if the dark streaks remains no matter what input the TV is connected to, the problem lies with the television.

  • Inspect the cable connection. Oftentimes when connecting a computer to an LCD TV, you can have strange dark streaks across the screen. Use a DVI-to-HDMI cable connection when plugging in your computer, then press the "Menu" button on your TV remote, select "Picture" and chose "Square Pixel." See whether the image adjusts and the dark streak goes away.
  • Contact the manufacturer of your LCD television if the dark streak remains. This streak can be caused by a defect in the television; if the TV is still under warranty, you can have it replaced.
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    If the loss of picture is either on top half or bottom half of screen. there are y buffer boards that go from top to bottom on left side of screen when looking at back that control those sections. when there is loss of half of picture then buffer associated with that area would be at fault and would need to be replaced. when i see a degrading symptom such as loss of picture on top half or bottom half leading to no picture issue normally you would check heat syncs on y sustain board and if not heating up after a few minutes of being turned on would recommend replacing y main and both y upper and lower y buffer boards as they complete a circuit

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