LG 50PG20- No Picture. just humming noise

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  • bekweezee
    New Member
    • Jun 2013
    • 3
    • United States
    #1

    LG 50PG20- No Picture. just humming noise

    Im very new to electrial type work but Im quick at learning and want to fix this myself.

    I was watching TV today and a "pop" noise happend and the screen went black.

    I did some research and tore the TV apart. A visual inspection of the boards looked good.

    I decided to take the wire harness off of the Y-SUS board and then plug the TV in and turn it on. The humming noise was not present. I plugged the harness tothe Y board back in and then turned the TV on again and the humming was there.

    I got a multimeter and there were 5V going into the y-sus board.

    On the thinner Y-boards on the left, I looked and seem that +5v was supposed to power the 7/8 slot [see picture] but no power was present.

    Is it an accurate assessment to say the problem is in the YSUS board?

    Thank you in advance for your assistance:







    ,
    Tags: None
    • bekweezee
      New Member
      • Jun 2013
      • 3
      • United States
      #2
      Re: LG 50PG20- No Picture. just humming noise

      please help

        Comment

        • capkid
          Badcaps Legend
          • Oct 2010
          • 1339
          • United States
          #3
          Re: LG 50PG20- No Picture. just humming noise

          It sounds like a Y-Sustain problem:
          - Have you closely examined the board for burns or visibly damaged components?
          - Are there any blown fuses on the Y-Sus? Check the fuse(s) on the Z-Sus, also. Fuses are usually marked with an "F" prefix.
          - Is there an LED on the Y-Sus, and is it lit when the TV's turned on?

          I don't know this chassis very well, so I'm unsure of what's under the heat sinks. Can you post a pic or two of the heat sinks from a different angle?
          Last edited by capkid; 06-15-2013, 10:43 AM.
          LG Plasma Mal-Discharge Correction Service

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: LG 50PG20- No Picture. just humming noise

              Also, carefully check the panel for cracks. A loud buzzing can be due to a cracked panel, and the crack can be very small.
              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

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