LG 42PC3D-UD dead no-lead solder arrggg!

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  • xaxxon
    Member
    • Jul 2010
    • 17
    • USA
    #1

    LG 42PC3D-UD dead no-lead solder arrggg!

    this 42" has a hybrid i.c. on the y-sustain board that i'm trying to desolder. unfortunately LG used no-lead solder on it. this stuff seems nearly impossible to remove.

    does anybody have any tips for dealing with this stuff?

    i got a tip on another site where you pre-treat solder wick with solder paste, which helped, but only somewhat.

    i've got a 35 watt iron, solder wick, paste and a solder sucker to use.
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: LG 42PC3D-UD dead no-lead solder arrggg!

      You will need an iron closer to 60W and with temperature regulation. These things are nasty to get off!
      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
          #3
          Re: LG 42PC3D-UD dead no-lead solder arrggg!

          I've been through this frustration, and I only use a desoldering gun now. You can try adding a little solder to each pin so that the solder flows better when you try to suck it up. The heat sinks on the IPMs absorb a lot of the soldering iron's heat, so a higher wattage iron would be best. Also, a hair dryer or a heat gun on a low setting would be helpful.
          Last edited by capkid; 06-03-2013, 11:05 AM.
          LG Plasma Mal-Discharge Correction Service

            Comment

            • flocko
              Badcaps Legend
              • Nov 2012
              • 1121
              • uk
              #4
              Re: LG 42PC3D-UD dead no-lead solder arrggg!

              I have found that if you first with a pair of pliers snap off the ends of the set screws, then drill them out to remove the heatsink, you can cut the leg's off the IPM and desolder them one by one no need for lots of heat. when you fit the new IPM use nut's and bolts

                Comment

                • xaxxon
                  Member
                  • Jul 2010
                  • 17
                  • USA
                  #5
                  Re: LG 42PC3D-UD dead no-lead solder arrggg!

                  thanks for the replies.
                  flocko: that sounds crazy enough to work!

                    Comment

                    • flocko
                      Badcaps Legend
                      • Nov 2012
                      • 1121
                      • uk
                      #6
                      Re: LG 42PC3D-UD dead no-lead solder arrggg!

                      just read my post again i did not mean fit IPM with nuts and bolts just the heatsink ?It's just a way to get the heatsink off leaving just the IPM on the board and making a hard job easy without doing damage

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: LG 42PC3D-UD dead no-lead solder arrggg!

                          Put the screws in from the top instead of the bottom to make it easier?
                          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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