LG 50PV450 Plasma Color issue

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  • dhoff024
    Senior Member
    • Mar 2013
    • 96
    • USA

    #1

    LG 50PV450 Plasma Color issue

    I have a friend with a LG 50PV450 that is having some issues with the color. When the tv is on it will almost dim and lighten on its own it will go from regular to dark to darker and back to regular (energy saving sensor is off). It isnt super drastic but as it gets darker the skin tones get very red. I have worked on many lcd/led tvs and was able to fix them with the help of this forum but this is my first plasma so I am not sure where to start. I will post a picture of the board to help diagnose the problem.
  • capkid
    Badcaps Legend
    • Oct 2010
    • 1339
    • United States

    #2
    Re: LG 50PV450 Plasma Color issue

    It sounds like it could be a ZSus issue. You'll need to start by checking for the standard voltages - there should be labeled test points on each of the boards:

    (1) PSU: VS and VA
    (2) YSus: -Vy and VSCAN
    (3) ZSus: VZB
    LG Plasma Mal-Discharge Correction Service

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: LG 50PV450 Plasma Color issue

      Wow, the PV450 from LG seems to be a reliable model. A lot of these late model plasmas seem to be pretty crap for reliability. Ugh.
      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

      • capkid
        Badcaps Legend
        • Oct 2010
        • 1339
        • United States

        #4
        Re: LG 50PV450 Plasma Color issue

        Originally posted by tom66
        Wow, the PV450 from LG seems to be a reliable model. A lot of these late model plasmas seem to be pretty crap for reliability. Ugh.
        Yeah, threads for these TVs seem to be popping up frequently. Disappointing.
        LG Plasma Mal-Discharge Correction Service

        Comment

        • Shinju
          Badcaps Legend
          • Mar 2014
          • 1239
          • USA

          #5
          Re: LG 50PV450 Plasma Color issue

          Check the solider joints on the copper inductor coils on both the y and x boards.

          Comment

          • dhoff024
            Senior Member
            • Mar 2013
            • 96
            • USA

            #6
            Re: LG 50PV450 Plasma Color issue







            Last edited by dhoff024; 03-13-2015, 03:00 PM.

            Comment

            • dhoff024
              Senior Member
              • Mar 2013
              • 96
              • USA

              #7
              Re: LG 50PV450 Plasma Color issue

              https://www.flickr.com/photos/98096475@N02/16185748993/

              https://www.flickr.com/photos/98096475@N02/16598386077/

              https://www.flickr.com/photos/98096475@N02/16618098318/

              https://www.flickr.com/photos/98096475@N02/16805657585/

              https://www.flickr.com/photos/98096475@N02/16804580312/

              https://www.flickr.com/photos/98096475@N02/16805660995/

              https://www.flickr.com/photos/98096475@N02/16805662445/
              Attached Files

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              • dhoff024
                Senior Member
                • Mar 2013
                • 96
                • USA

                #8
                Re: LG 50PV450 Plasma Color issue

                Sorry for the delay also I was having a heck of a time getting the pictures to upload and now I put links and got the images to upload go figure but this is what I am working with I dont know if anything looks out of order or not but if anyone sees anything let me know. Also how do I check the voltages as suggested above?

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: LG 50PV450 Plasma Color issue

                  A common problem on these sets are cold solder joints on the various sustain board ERC inductors/coils.

                  The components in question are the two coils near the bottom of the Z-sustain board:
                  https://www.badcaps.net/forum/attach...4&d=1427480101

                  And the Y-sustain, between the black and silver heatsinks:
                  https://www.badcaps.net/forum/attach...3&d=1427480101

                  The solder joints on these often fail. Remove both boards and apply fresh solder to the joints (2 per inductor, 8 total)
                  Last edited by tom66; 03-27-2015, 01:12 PM.
                  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

                  • dhoff024
                    Senior Member
                    • Mar 2013
                    • 96
                    • USA

                    #10
                    Re: LG 50PV450 Plasma Color issue

                    Originally posted by tom66
                    A common problem on these sets are cold solder joints on the various sustain board ERC inductors/coils.

                    The components in question are the two coils near the bottom of the Z-sustain board:
                    https://www.badcaps.net/forum/attach...4&d=1427480101

                    And the Y-sustain, between the black and silver heatsinks:
                    https://www.badcaps.net/forum/attach...3&d=1427480101

                    The solder joints on these often fail. Remove both boards and apply fresh solder to the joints (2 per inductor, 8 total)
                    Just was able to take the boards off and take them home I desoldered the coils removed all the old solder and applied fresh solder to the coils I will test today and post the results. Thanks again for the help

                    Comment

                    • dhoff024
                      Senior Member
                      • Mar 2013
                      • 96
                      • USA

                      #11
                      Re: LG 50PV450 Plasma Color issue

                      Tv Has been up and running for a few hours now and seems to be fixed all colors look good and there is no fluctuation in screen brightness at all I would say that as of right now it seems to be fixed I appreciate all the responses I will update if anything changes.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: LG 50PV450 Plasma Color issue

                        Glad to hear - another one of these fixed.
                        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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