LG 42PC1D Fuzzy Picture

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  • evs87
    New Member
    • Sep 2012
    • 8
    • United Kingdom
    #1

    LG 42PC1D Fuzzy Picture

    Hey Guys,

    I have been given this plasma for free so thought I would have a go at repairing it. It had sound but no picture. I traced it down to the IPM and a blown fuse on the YSUS. I have replaced both and now have picture but it seems to have a fuzzy look to it. The power board has a few swollen caps, could this be the causing the problem? I have added some pics for you to have a look at.
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    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: LG 42PC1D Fuzzy Picture

      Those definitely need replacement, they could cause the issue but I think it's more likely you have the common LG sparklies problem which is very difficult to fix, the panel has aged and the control board needs to have a firmware update.

      You can try knocking Vs and Va down by about 5-10V and see if that fixes it; if not, tweak SET_UP and SET_DN on the Y-sustain.
      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

        • evs87
          New Member
          • Sep 2012
          • 8
          • United Kingdom
          #3
          Re: LG 42PC1D Fuzzy Picture

          I have already adjusted the SET_UP / DOWN to get rid of the "red snow" which worked for the redness but not the sparkles.

          How would I Know when I have adjusted it by 5-10V? Sorry if it's a simple question, this is a little hobby I thought it have a go at!

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: LG 42PC1D Fuzzy Picture

              You would need to measure it with a voltmeter on the connector going to the sustain board. Nominally about 190V for Vs, 65V for Va for LG panels.
              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

                • evs87
                  New Member
                  • Sep 2012
                  • 8
                  • United Kingdom
                  #5
                  Re: LG 42PC1D Fuzzy Picture

                  OK great I'll give that a try. Would you do it before replacing the caps?

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: LG 42PC1D Fuzzy Picture

                      I would recommend replacing the caps asap as the TV will start having problems powering up. It should work for now though.
                      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

                        • evs87
                          New Member
                          • Sep 2012
                          • 8
                          • United Kingdom
                          #7
                          Re: LG 42PC1D Fuzzy Picture

                          Cheers Tom, I'll have a go at adjusting the Vs / Va and if that works I'll replace the caps if not I guess down the dump it goes!

                            Comment

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