LG 47LG20 TV has no video and no sound

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  • repairsandmods
    New Member
    • Jul 2012
    • 2
    • USA
    #1

    LG 47LG20 TV has no video and no sound

    This is my first post and hoping to find some help here. When powering on the TV, the power light takes a few seconds to come on and also to turn off. When turning it on, the green power light stays on but there is no sound and no image. I've tried turning off the lights and using a flashlight to see if it might be the inverter board but there is not even a faint/dim image on the LCD. Almost all of the capacitors have been replaced on the power supply board. The ones that were not replaced were tested with an ESR meter and the capacitance looks fine, as well as the ESR.

    I'm hoping the LCD itself isn't bad. Can someone help me out with diagnosing this problem?
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: LG 47LG20 TV has no video and no sound

      Does the screen glow at all? Unlikely to be the actual LCD, sounds like inverter board problem.
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • repairsandmods
          New Member
          • Jul 2012
          • 2
          • USA
          #3
          Re: LG 47LG20 TV has no video and no sound

          I do not get any glow when the TV is on and I turn off all the room lights.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: LG 47LG20 TV has no video and no sound

              Originally posted by repairsandmods
              I do not get any glow when the TV is on and I turn off all the room lights.
              No flash at all when turned on?

              Do you have a multimeter?

              Take some pictures of the power supply (it's the big board which the mains power connects to.)
              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                • retiredcaps
                  Badcaps Legend
                  • Apr 2010
                  • 9271
                  #5
                  Re: LG 47LG20 TV has no video and no sound

                  Is there no sound at all for all av inputs?
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