HP PL4260N (LG PD42X32002 Panel) Help Please

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  • itek
    Senior Member
    • Aug 2010
    • 65
    #1

    HP PL4260N (LG PD42X32002 Panel) Help Please

    Hi guys, my first post here looking for some help. I have an HP PL4260N that came in with no video & working sound. It had a blown fuse on the Z-Sus board so I replaced STK 795-820 ipm on Z-Sus, still no video. I replaced the STK 795-820 ipm on Y-Sys (which had blown), and when powered blew the fuse on Z-Sus again. After the fuse blew I get a very dark static around the edges, and the Y-Sus heatsink gets very hot. If I put a good fuse in the Z-Sus board, it doesn't blow again but the unit doesn't even power up, it clicks, thens clicks back red. Where to I go next? I thank you in advance for any help, I'm still learning!
    Tags: None
    • itek
      Senior Member
      • Aug 2010
      • 65
      #2
      Re: HP PL4260N (LG PD42X32002 Panel) Help Please

      OK so these 2 large caps on the power board are Nichicon 450V 330uf. They both are testing ~300uf and last night after desoldering 1 pin to remove them from circuit they were testing ~.17-.23 ESR now this morning they are testing ~.30-.34 ESR. Is this normal or are they toast? Thanks!

        Comment

        • PlainBill
          Badcaps Legend
          • Feb 2009
          • 7034
          • USA
          #3
          Re: HP PL4260N (LG PD42X32002 Panel) Help Please

          Originally posted by itek
          OK so these 2 large caps on the power board are Nichicon 450V 330uf. They both are testing ~300uf and last night after desoldering 1 pin to remove them from circuit they were testing ~.17-.23 ESR now this morning they are testing ~.30-.34 ESR. Is this normal or are they toast? Thanks!
          That is normal. These are not low ESR caps.

          PlainBill
          For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

          Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

            Comment

            • itek
              Senior Member
              • Aug 2010
              • 65
              #4
              Re: HP PL4260N (LG PD42X32002 Panel) Help Please

              Wow almost 2 months later I got it running!!!!
              1. Replaced IPM on Z-Sus,
              2. then blew it with a bad Y-Sus,
              3. then replace IPM on Y-Sus,
              4. then replace Z-Sus board

              I read in a post once here, I forget who posted it "If you want to learn, replace the chip, if you want to fix it, replace the board" - Excellent Advice! I have learned alot

              Its running now but I got light red static, I guess I need to calibrate it..
              Thanks everyone on this forum for being so helpful.

                Comment

                • itek
                  Senior Member
                  • Aug 2010
                  • 65
                  #5
                  Re: HP PL4260N (LG PD42X32002 Panel) Help Please

                  OK I adjusted in accordance to the LG guide with no luck....... I guess I'm stuck with the red snow without a firmware flash from what I hear?

                    Comment

                    • rayrod81
                      Badcaps Veteran
                      • Oct 2010
                      • 205
                      #6
                      Re: HP PL4260N (LG PD42X32002 Panel) Help Please

                      Yeah to get rid if the red maldischarge you would need to update firmware on the control board.

                        Comment

                        • cadiman
                          Badcaps Veteran
                          • Mar 2010
                          • 397
                          #7
                          Re: HP PL4260N (LG PD42X32002 Panel) Help Please

                          That would have been me. ( If you want to learn).

                          Good for you to take the long road!

                          Cadiman

                            Comment

                            • kordris
                              New Member
                              • Feb 2012
                              • 1
                              #8
                              Re: HP PL4260N (LG PD42X32002 Panel) Help Please

                              itek maybe you can give me some tips on getting my model to working. I had the same problem with the red light. Also on those caps I'd they are bulging very very little on the top could they be bad? If anyone has a idea on what could be the problem. Thanks for any help.

                                Comment

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