Question about LG 42LC2D 42 in. LCD HDTV

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My 42" LG LCD TV is experiencing the following problem, After a few minutes of watching the screen will black out and go blank. I have sound and shows get recorded but there is no picture? Is this common and how much is it to fix the problem?

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  • 3 more comments 
  • jonmac1124 Oct 09, 2010

    I pointed flashlight at tv and did not see a faint image? what am I looking for ? My model number is DU-42px12x/12xc

  • jonmac1124 Oct 09, 2010

    model number DU-42px12x/12xc

    I shined flashlight at TV and did not see a faint image? What kind of image am I looking for?

  • jonmac1124 Oct 09, 2010

    Sorry, It is a plasma TV Model # DU-42px12x/12xc

    For some reason I was thinking LCD, it is a plasma.

  • jonmac1124 Oct 09, 2010

    power indicator does not blink, it remains solid green when powered on.

  • jonmac1124 Oct 09, 2010

    Power indicator does not blink, I have full sound. When I turn on the tv I have a good picture for 5-10 minutes then it flashes out with sound remaining. The shows record on my DVR. Sometimes the tv will have a picture a little longer but for the most part it stays with no picture but will come back on for few seconds then blank out again. When on I get a quality picture.

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Hi,
Point flash light closely on tv screen and observe faint image in screen, if image is available then tv got problem with back light circuit.
Let me know model number of your LG tv to provide you more info.
Thanks.

Posted on Oct 09, 2010

  • 3 more comments 
  • Shahid Electronics
    Shahid Electronics Oct 09, 2010

    This is Plasma TV as model DU-42px12x/12xc shows it.

    Flash light idea was only for LCD TV as you mentioned in your question.

  • Shahid Electronics
    Shahid Electronics Oct 09, 2010

    Does power indicator blinks when tv lose picture but sound remains?

  • Shahid Electronics
    Shahid Electronics Oct 09, 2010

    Does power indicator blinks when tv lose picture but sound remains?
    This will help me to diagnose problem.

  • Shahid Electronics
    Shahid Electronics Oct 09, 2010

    OK, thanks for info.
    Problem seems with power supply board that does not maintain certain voltage supply to plasma panel to generate image so video mute circuit kicks in and turns video signal towards plasma panel off.
    Most probably few dried up/ leaky capacitors in power supply board need to be replaced and voltage adjustment is needed by professional.
    Repair cost could be around $200 t0 $300, contact local tv repair shop for an estimate of repair for that problem in tv.
    Thanks.

  • Shahid Electronics
    Shahid Electronics Oct 09, 2010

    Plasma panel requires certain amount of high voltage to produce light in pixels, if voltage level goes low, light wont be produced and if voltage goes high, extra high bright light will be seen that is called quality loss in picture.
    Power supply is responsible for regulated, smooth and constant voltage supplies to panel. That is why I asked about leaky or dried up capacitors in power supply board that can cause of irregular voltage supply resulting no image in plasma panel.

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