Samsung UE55JU6872UXXH - Lower third darker

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  • bbccbb
    Senior Member
    • Jan 2017
    • 53
    • Croatia

    #21
    Re: Samsung UE55JU6872UXXH - Lower third darker

    Some photos... regular spacer... front and back. It can be rotated 90 degrees. But I do not think I have to remove these.
    And white spacer... only front for now.
    Attached Files

    Comment

    • bbccbb
      Senior Member
      • Jan 2017
      • 53
      • Croatia

      #22
      Re: Samsung UE55JU6872UXXH - Lower third darker

      Well... it looks like white one is the same as the others... but only white ones are in front of the reflective sheet.

      Comment

      • bbccbb
        Senior Member
        • Jan 2017
        • 53
        • Croatia

        #23
        Re: Samsung UE55JU6872UXXH - Lower third darker

        Originally posted by budm
        Those standoff I turn it 90 degree and pull out.
        True. Now I have to remove white plastic frame that holds reflective sheet.

        Comment

        • bbccbb
          Senior Member
          • Jan 2017
          • 53
          • Croatia

          #24
          Re: Samsung UE55JU6872UXXH - Lower third darker

          Removed the reflective sheet, moved LED strips up and down where these connect to the vertical power strip...
          And it works now.

          Now I have a different problem... loud 50Hz buzz from the power board...
          Attached Files

          Comment

          • chrismurphy
            Badcaps Veteran
            • May 2014
            • 251
            • australia

            #25
            Re: Samsung UE55JU6872UXXH - Lower third darker

            just turn on the TV with the screen removed , you will see if any of the LED's are faulty

            Comment

            • R_J
              Badcaps Legend
              • Jun 2012
              • 9515
              • Canada

              #26
              Re: Samsung UE55JU6872UXXH - Lower third darker

              Looks like that is what he did, look at the post above yours.

              Comment

              • Diah
                Badcaps Legend
                • Feb 2013
                • 6343
                • Germany

                #27
                Re: Samsung UE55JU6872UXXH - Lower third darker

                Originally posted by bbccbb
                Removed the reflective sheet, moved LED strips up and down where these connect to the vertical power strip...
                And it works now.

                Now I have a different problem... loud 50Hz buzz from the power board...
                the noise you hear because u still have bad contact at BL strips sockets. you need to re solder them all

                Comment

                • bbccbb
                  Senior Member
                  • Jan 2017
                  • 53
                  • Croatia

                  #28
                  Re: Samsung UE55JU6872UXXH - Lower third darker

                  Originally posted by Diah
                  the noise you hear because u still have bad contact at BL strips sockets. you need to re solder them all
                  You think that I should check the sockets on the vertical power strip?
                  Or to check the socket that connects power strip with power board?

                  I still have the whole TV disassembled.

                  Comment

                  • Diah
                    Badcaps Legend
                    • Feb 2013
                    • 6343
                    • Germany

                    #29
                    Re: Samsung UE55JU6872UXXH - Lower third darker

                    Originally posted by bbccbb
                    You think that I should check the sockets on the vertical power strip?
                    Or to check the socket that connects power strip with power board?

                    I still have the whole TV disassembled.
                    thought you just move sockets with hand and they power on..
                    also re soldering all sockets on the vertical BL strip even the sockets on PSU to be sure this will never happen again

                    Comment

                    • bbccbb
                      Senior Member
                      • Jan 2017
                      • 53
                      • Croatia

                      #30
                      Re: Samsung UE55JU6872UXXH - Lower third darker

                      Originally posted by Diah
                      thought you just move sockets with hand and they power on..
                      also re soldering all sockets on the vertical BL strip even the sockets on PSU to be sure this will never happen again
                      No... I moved lower horizontal strips (those that did not light up) 2mm up and then down just to reconnect with vertical power strip. After doing that BL lit up.
                      Maybe I should do that with all horizontal strips.

                      I can also hear popping sounds from power board when I connect the power cable. Not turning the TV on... just plugging it into socket.
                      Popping sound originates from transformers with multiple leads, packed in black plastic, located in the middle of the board.

                      And a bit strange question... I think I can hear sound from the BL strips. 50Hz with something in the higher frequencies. How can LED produce sound?!?!
                      I'll try to record what I hear.
                      Last edited by bbccbb; 04-14-2019, 04:09 PM.

                      Comment

                      • bbccbb
                        Senior Member
                        • Jan 2017
                        • 53
                        • Croatia

                        #31
                        Re: Samsung UE55JU6872UXXH - Lower third darker

                        Ok... here are the recorded sounds.
                        First one is sound recorded at the central transformers after switching the TV off. This popping sound is audible at the moment TV receives power (stand by also).

                        The second sound is recorded near LED strips while turning the TV on from standby.

                        Sounds placed inside a .zip file.
                        Attached Files

                        Comment

                        • bbccbb
                          Senior Member
                          • Jan 2017
                          • 53
                          • Croatia

                          #32
                          Re: Samsung UE55JU6872UXXH - Lower third darker

                          Does this mean I have to change power board?

                          Comment

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