Samsung PN50B450 sparking screen

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  • paulstef
    Badcaps Veteran
    • Dec 2013
    • 724
    • Canada
    #1

    Samsung PN50B450 sparking screen

    Hi experts,

    I've never seen something like this before. There are sparks inside the screen near the X board. When I remove metal plate under the mainboard that connects chassis to outer metal frame the sparks occure between these two. Nice lightshow.

    There is a black shadow on the upper left corner (slow mow pixelisation effect) similar to the attached pic.
    VS/VA, 15V are ok. No cold solder joints, apparently no faulty component on x-main.


    What should be the signal like on the flatcables towards the screen? What can be measured there?

    Thanks for any ideas
    Attached Files
    Tags: None
    • attainteddragon
      Badcaps Veteran
      • Apr 2013
      • 764
      • australia
      #2
      Re: Samsung PN50B450 sparking screen

      someone else had a similar problem once, but i can't remember on what model.

      he ended up replacing the insulated foam tape that goes on the inside of the outer glass frame and it sorted his problem out.
      WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

        Comment

        • dick_barton
          Badcaps Legend
          • Aug 2015
          • 6642
          • Wales
          #3
          Re: Samsung PN50B450 sparking screen

          https://www.badcaps.net/forum/showth...light=sparking
          Willing to help but I'm no expert.

            Comment

            • paulstef
              Badcaps Veteran
              • Dec 2013
              • 724
              • Canada
              #4
              Re: Samsung PN50B450 sparking screen

              Originally posted by dick_barton
              https://www.badcaps.net/forum/showth...light=sparking
              It sounds like a very similar problem. I'll check it out.

              I still have the dark left picture though which looks more like a X-Main fault but couldn't find anything wrong with it yet.

              Here we go disassembling a Plasma panel...

                Comment

                • sordids999
                  Badcaps Legend
                  • May 2013
                  • 2152
                  • uk
                  #5
                  Re: Samsung PN50B450 sparking screen

                  Vsc voltages and Ve ok ?

                    Comment

                    • paulstef
                      Badcaps Veteran
                      • Dec 2013
                      • 724
                      • Canada
                      #6
                      Re: Samsung PN50B450 sparking screen

                      Originally posted by sordids999
                      Vsc voltages and Ve ok ?
                      yes, all checked.

                        Comment

                        • paulstef
                          Badcaps Veteran
                          • Dec 2013
                          • 724
                          • Canada
                          #7
                          Re: Samsung PN50B450 sparking screen

                          The panel is toast. There is a conductive grid inside/underneath the glass where the flat cables from X-Main come. This grid is largely interrupted and this is where the sparks fly from one side to the other.

                          At least I learned something, e.g. that the inside of the protection glass is conductive Could be used for some project maybe

                          You can see it in the video here:
                          https://www.youtube.com/watch?v=Zpm_oDCAUFk
                          Attached Files

                            Comment

                            • attainteddragon
                              Badcaps Veteran
                              • Apr 2013
                              • 764
                              • australia
                              #8
                              Re: Samsung PN50B450 sparking screen

                              didn't know that was your youtube account.

                              are you sure that you can't insulate it between the arcing points?
                              WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                                Comment

                                • paulstef
                                  Badcaps Veteran
                                  • Dec 2013
                                  • 724
                                  • Canada
                                  #9
                                  Re: Samsung PN50B450 sparking screen

                                  Originally posted by attainteddragon
                                  didn't know that was your youtube account.

                                  are you sure that you can't insulate it between the arcing points?
                                  The X-main cables go to the grid, then the grid is interrupted, the other side of the grid not being accessible. There is nothing I can do unfortunately.

                                    Comment

                                    • attainteddragon
                                      Badcaps Veteran
                                      • Apr 2013
                                      • 764
                                      • australia
                                      #10
                                      Re: Samsung PN50B450 sparking screen

                                      that sux, at least you found it quickly.
                                      WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                                        Comment

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