Panasonic TX-P50G20B - loud hum in speakers

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  • Nicholas
    Senior Member
    • Dec 2014
    • 60
    • Kingdom of Denmark
    #1

    Panasonic TX-P50G20B - loud hum in speakers

    Hi guys

    My Panny TX-P50G20B just tonight started making a loud hum in the
    speaker. The hum is increased when there is more white in the image,
    and decreased as the screen go darker.

    Any thoughts on this? GND issue?

    Thanks,

    Nicholas
    Tags: None
    • RJARRRPCGP
      Badcaps Legend
      • Jul 2004
      • 6301
      • USA
      #2
      Re: Panasonic TX-P50G20B - loud hum in speakers

      Sounds like some solder broke.
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        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: Panasonic TX-P50G20B - loud hum in speakers

          Mute the sound, does the humm continue? These models and others are known for a "buzz" issue which occurs over time due to a design flaw, buzz varying with brightness. If you start hearing it, disconnect the power immediately. You need to fix a problem on the SC board (loose screws) before it fails and causes considerable damage.
          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

            • Nicholas
              Senior Member
              • Dec 2014
              • 60
              • Kingdom of Denmark
              #4
              Re: Panasonic TX-P50G20B - loud hum in speakers

              Tom, thanks!

              What is the SC board?

                Comment

                • tw2005
                  Badcaps Legend
                  • Oct 2011
                  • 6458
                  • Australia
                  #5
                  Re: Panasonic TX-P50G20B - loud hum in speakers

                  Originally posted by Nicholas
                  Tom, thanks!

                  What is the SC board?
                  with back panel off, viewing from rear, left hand side. looks exactly like my avatar for that is what is in your TV

                    Comment

                    • Moreno83
                      Badcaps Legend
                      • Jun 2014
                      • 2008
                      • The Netherlands
                      #6
                      Re: Panasonic TX-P50G20B - loud hum in speakers

                      Im still testing the same tv , with no input connected the plasma screen itself makes noise. When i connect it to HDMI the sound almost disappears but is present.
                      I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                        Comment

                        • Nicholas
                          Senior Member
                          • Dec 2014
                          • 60
                          • Kingdom of Denmark
                          #7
                          Re: Panasonic TX-P50G20B - loud hum in speakers

                          Hehe nice one with the avatar. And I can see the little transformer in the bottom. So,
                          I remove the back panel and check all the screws. They're really tight and nice. I connect
                          the HDMI and power, and the hum is gone...except for the slight hzz from the PSU.
                          No problem now. Wonderful with come-and-go problems

                            Comment

                            • Moreno83
                              Badcaps Legend
                              • Jun 2014
                              • 2008
                              • The Netherlands
                              #8
                              Re: Panasonic TX-P50G20B - loud hum in speakers

                              If you remove the HDMI input and let it run without any inputs you will get a buzz. The buzz comes from the panel itself like Tom said. Dont think its possible to make it disappear completely.
                              I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                                Comment

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