LG 50PC1D need help guys

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  • PowerAmpFreak
    Badcaps Veteran
    • Feb 2010
    • 977
    • Sweden
    #1

    LG 50PC1D need help guys

    Hi all.
    Got an LG plasma 50PC1D. Came in with this failure:
    Picture flashes up bright for 1/10 of a second or so. Goes black for one or two seconds, then start's over , flashes up bright in an endless loop.

    I found a blown upper buffer board (6871QDH088A) replaced but still no difference in behaviour.

    According to my mains power meter , set draws about 200W constant from the mains.
    When the set flashes white , a sharp sound could be heard , probably from the high power consumption during the "flash".

    Pulled out the Y-SUS , without finding anything "obvious" like shorted IPM's or power mosfets.

    Is it safe to operate the set without the lower buffer / just the new upper in case the lower has been damaged?
    I have measured across the lower buffer without finding anything strange.

    Y-SUS part#: 6871QYH039B
    Attached Files
    Tags: None
    • freakaftr8
      Badcaps Legend
      • Oct 2012
      • 3743
      • USA
      #2
      Re: LG 50PC1D need help guys

      this does not mean you do not have a open IPM. You can run the set with one buffer and but you can also run it with no buffers. But I would advise having at least one buffer installed feel each IPM for a cold one after a few minutes of operation. What you're describing sounds like a bad lower ER IPM on YSUS. when the set is on and you see the bright flashing on the screen still here at significant ticking sound coming from one of the IPM modules?
      Did I leave the soldering iron on?

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: LG 50PC1D need help guys

          Bad ER-IPM breaking down internally or something similar. Seen it before.
          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

            • PowerAmpFreak
              Badcaps Veteran
              • Feb 2010
              • 977
              • Sweden
              #4
              Re: LG 50PC1D need help guys

              The ER-IPM generates ticking...
              Did not dare to push it so long to make the heatsinks hot (or not).
              OK, so replacing the ER-IPM (the upper of the two) will probably make it good then?

                Comment

                • mmartell
                  Badcaps Legend
                  • Oct 2013
                  • 3189
                  • Canada
                  #5
                  Re: LG 50PC1D need help guys

                  I have the exact fault here with a rebranded 50PC1D (Toshiba) and I am about to order an ER IPM as well. This will be my last messing with these IPM's, especially where they are paired up. Just replaced one in a 60PC1D and blew after probably less than 10 hours of use.

                  I read here it is important to replace with the exact module and suffix.

                    Comment

                    • PowerAmpFreak
                      Badcaps Veteran
                      • Feb 2010
                      • 977
                      • Sweden
                      #6
                      Re: LG 50PC1D need help guys

                      Yeah, it's not the funniest of the jobs I can imagine.
                      I hate IPM's and favor the discrete designs, but that's another story!

                        Comment

                        • nismo
                          New Member
                          • Jun 2015
                          • 1
                          • Australia
                          #7
                          Re: LG 50PC1D need help guys

                          Hi

                          Sorry to jump your thread, but I was wondering if you could help me in providing the details of the components (value/markings) located on the power board.

                          The components are shown on the board as C802 and D801 which are located between the two heat sinks.

                          I have attached a photo to show actual location.

                          Any assistance would be appreciated.

                          Thanks
                          Attached Files

                            Comment

                            • Cornboats
                              Dave
                              • Oct 2010
                              • 232
                              • United Kingdom
                              #8
                              Re: LG 50PC1D need help guys

                              C802 is a capacitor
                              D 801 is a diode

                                Comment

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