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Hello. I have an LG 47LG20 TV, sound is OK but with no video nor image. The screen remain in black. Wanted to know if there is part that you think is creating this issue and if yes, from where I can get it. Thanks Jose

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  • jmosco2 May 21, 2011

    1. How old is the unit?
    2009
    2. Is there any power surge?
    Yes
    3. Any pop up noise or any strange noise you hear when you on the TV?
    TV was working fine, then I heard a noise on the back of the screen and the screen went black, the sound remained ok. No weather issues when he problem started. I did reset with no success
    4. Is it dead or do you see LED's blinking?
    No Led's blinking
    5. If yes, any sequence like 3 blinks then a pause followed by 3 more blinks?
    No led's blinking
    6. Which LED is blinking and color of the same?
    No led's blinking

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  • Master
  • 10,515 Answers

Hi,

I am sorry to hear regarding the problem. There could be few possibilities.Unplug the unit for few minutes, say 15 minutes and then turn the unit on. If still you do not see any image or hear any video, this would confirm an internal fault and needs repair.I would like to have few questions answered to provide with more appropriate response :-

1. How old is the unit?
2. Is there any power surge?
3. Any pop up noise or any strange noise you hear when you on the TV?
4. Is it dead or do you see LED's blinking?
5. If yes, any sequence like 3 blinks then a pause followed by 3 more blinks?
6. Which LED is blinking and color of the same?

Let me know,so that we could proceed.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on May 21, 2011

  • taran_2005
    taran_2005 May 21, 2011

    Thanks for your response!!

    The information you gave is vital to the diagnosis. It is highly suggestive of faulty power supply board. If it's acting absolutely dead when you plug in the power cord,
    that's the most likely cause. No guarantee, but that's where to start
    checking.
    Do you have a voltmeter and know how to use it?
    If so, check the output from the power supply board. You need to find
    out if you have a +5 volts stand-by power. If that's not there, then
    that's the problem.If you take the set to an authorized LG service center, expect to pay
    roughly $125 for labor and $175 for the part. If LG has the part in
    stock, they should be able to get it to the servicer in 3 to 5 business
    days at the most. As this set is only one and half years old, you could speak to LG to get some discount on labor cost.

    If you wish to repair it, you need to have multimeter and soldering kit. If you wish to repair it, revert and i would be able to provide you with further details.

    Let me know,so that we could proceed.

    Hope i helped you.

    Thanks for using ' Fixya ' and have a nice day!!

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