Samsung UN55D6450 turns itself off and on endlessly, no blinks

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  • johnboy1313
    Badcaps Legend
    • Nov 2012
    • 1959
    • USA

    #61
    Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

    Originally posted by withalligators
    Again, after you get it open, and I can repeat the process, I'd like the backlight strips from you. I don't know how else I'd ever get any, so getting them from you would be amazingly fortuitous.

    Edit: I typed this before a ton of replies but didn't press post. This is awesome! I'm glad there are some screws holding it together under that tape. So, the tape might be a little structural, but it's probably to prevent light leakage, eh?


    Yeah. I would agree.
    Last edited by johnboy1313; 01-21-2014, 03:58 PM.

    Comment

    • johnboy1313
      Badcaps Legend
      • Nov 2012
      • 1959
      • USA

      #62
      Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

      There are some slightly sticky rubber strips between the LCD and the casing. Be careful. It's not very sticky. But it could cause damage if you're not careful.
      Attached Files

      Comment

      • johnboy1313
        Badcaps Legend
        • Nov 2012
        • 1959
        • USA

        #63
        Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

        Money shot. The LED strips are on the left and right sides. No LEDs on the top or bottom.
        Attached Files

        Comment

        • mmartell
          Badcaps Legend
          • Oct 2013
          • 3189
          • Canada

          #64
          Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

          Sweet

          Comment

          • mmartell
            Badcaps Legend
            • Oct 2013
            • 3189
            • Canada

            #65
            Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

            How many wires going to each led strip ?

            Comment

            • johnboy1313
              Badcaps Legend
              • Nov 2012
              • 1959
              • USA

              #66
              Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

              Originally posted by withalligators
              Again, after you get it open, and I can repeat the process, I'd like the backlight strips from you. I don't know how else I'd ever get any, so getting them from you would be amazingly fortuitous.
              PM me.
              Attached Files

              Comment

              • johnboy1313
                Badcaps Legend
                • Nov 2012
                • 1959
                • USA

                #67
                Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                Originally posted by mmartell
                How many wires going to each led strip ?
                Eight

                Comment

                • mmartell
                  Badcaps Legend
                  • Oct 2013
                  • 3189
                  • Canada

                  #68
                  Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                  Eight ?? Jesus, I only have four wires total going in, assuming I have two strips that's only two wires a piece. Quite a difference.

                  Comment

                  • johnboy1313
                    Badcaps Legend
                    • Nov 2012
                    • 1959
                    • USA

                    #69
                    Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                    There are two harnesses running into the panel from the PSU. The harness for the left strip has ten wire at the PSU but only eight at the strip. The right has right at both ends.
                    Attached Files

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #70
                      Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                      Before you completely strip the set down, any chance of making voltage readings at each pin?
                      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

                      • johnboy1313
                        Badcaps Legend
                        • Nov 2012
                        • 1959
                        • USA

                        #71
                        Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                        Too late

                        Comment

                        • withalligators
                          Badcaps Veteran
                          • Jun 2013
                          • 267
                          • USA

                          #72
                          Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                          Ok, John's LED strips arrived and I tore the panel apart and inspected the LED strips. Sure enough, the left side (facing the rear) had a burnt out LED just a little up from the bottom. I swapped out that side and powered it up. Both sides lit (HOORAY!). I put it back together and now have a working set. All you folks who suspected a faulty LED strip should take a bow, you were right and I would have saved a lot of trouble had I just listened from the start.

                          So, now that's all back together I have horrible flashlighting on a black screen. I guess it's from separating the various diffuser layers. Has anyone had any luck fixing this? I was thinking of taking off it's bezel and laying it on something vibrating like a washing machine or something. Terrible idea?

                          Notes from disassembly: the black tape isn't structural, as there are plenty of screws hidden under it. It is to prevent light leakage though, and when assembled without it, you can see the silver screws through the clear bezel as well as light.

                          I have a left over LED strip from the right side, if anyone wants it, PM me.

                          Comment

                          • Ltank
                            Badcaps Veteran
                            • Jun 2013
                            • 776
                            • USA

                            #73
                            Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                            Glad for you. Curious about the LEDs that are soldered to the old boards that were removed from the set. Could you unsolder one LED from board and take a pic of the
                            markings so others can buy individual replacement LEDs in case the strips are not available. I have a set that may have same issue and I could build a test LED strip.
                            Thanks

                            Comment

                            • mmartell
                              Badcaps Legend
                              • Oct 2013
                              • 3189
                              • Canada

                              #74
                              Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                              Is there writing on the underside ?

                              Comment

                              • Ltank
                                Badcaps Veteran
                                • Jun 2013
                                • 776
                                • USA

                                #75
                                Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                                All electric parts have some type of marking. Sometimes a code that you must lookup online to determine what the part is. Top,Bottom or Side they are marked. So a Pic would
                                be great. If remove the bad LED and take a pic and or tell us the markings we can locate the part..thanks

                                Comment

                                • mmartell
                                  Badcaps Legend
                                  • Oct 2013
                                  • 3189
                                  • Canada

                                  #76
                                  Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                                  I will take one off mine maybe tonight.

                                  Comment

                                  • mmartell
                                    Badcaps Legend
                                    • Oct 2013
                                    • 3189
                                    • Canada

                                    #77
                                    Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                                    Wow has anyone taken one of these off ? I am butcheting my board and they won't budge.

                                    Here is a pic of the underside of the strip when you take it off the rail/heatsink it is screwed to. Maybe these numbers mean something to somebody (or google lol)
                                    Attached Files

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #78
                                      Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                                      This looks like a metal core PCB. It is probably not intended to be disassembled. The metal heatsinks the LEDs directly. The top side is probably ceramic which is a good thermal conductor. The two halves are probably bonded with thermal adhesive.
                                      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

                                      • mmartell
                                        Badcaps Legend
                                        • Oct 2013
                                        • 3189
                                        • Canada

                                        #79
                                        Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                                        Well that's not too good then...

                                        Comment

                                        • tom66
                                          EVs Rule
                                          • Apr 2011
                                          • 32560
                                          • UK

                                          #80
                                          Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                                          Can't you desolder the LEDs?
                                          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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