Samsung UE32D4003BW Backlight problem.

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #21
    Re: Samsung UE32D4003BW Backlight problem.

    Originally posted by Gemat
    If the wire is not cut,
    when I turn on the TV it outputs 1volt and the leds lit full.
    after a second or two the voltage will drop to 0,3volts and the leds lit very low...

    If the wire is cut, the leds lit full all the time...
    I understand that but does the backlights level adjustment in the on screen user manual have any affect on the backlights level when you try to adjust it?
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #22
      Re: Samsung UE32D4003BW Backlight problem.

      Power supply board BN44-00472A, see schematic.
      You may be able to dim the the backlights down by installing the the 18K resistor in parallel with resistor OP5.
      Attached Files
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment

      • Gemat
        Member
        • Nov 2014
        • 23
        • Ελλάδα

        #23
        Re: Samsung UE32D4003BW Backlight problem.

        Originally posted by budm
        I understand that but does the backlights level adjustment in the on screen user manual have any affect on the backlights level when you try to adjust it?
        None....

        The odd thing is that the panel started showing horizontal lines after a few hours of testing....
        Maybe the mainboard is breaking down after all....

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: Samsung UE32D4003BW Backlight problem.

          Horizontal lines will be the LCD panel. Solid color lines?
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

          • Gemat
            Member
            • Nov 2014
            • 23
            • Ελλάδα

            #25
            Re: Samsung UE32D4003BW Backlight problem.

            Originally posted by budm
            Horizontal lines will be the LCD panel. Solid color lines?
            The picture was fine when I started the TV

            after half an hour is started showing some barely visible interlacing..

            After three hours the interlacing was clearly visible , but not every other line. there were 2 areas with problematic display...

            I will take a photo tomorrow and post it...

            Comment

            • Gemat
              Member
              • Nov 2014
              • 23
              • Ελλάδα

              #26
              Re: Samsung UE32D4003BW Backlight problem.

              Here is a picture of the Tv working

              https://i.imgur.com/sApzpaN.jpg

              Comment

              • vinceroger69
                Badcaps Legend
                • Mar 2012
                • 6714
                • uk

                #27
                Re: Samsung UE32D4003BW Backlight problem.

                Originally posted by Gemat
                Here is a picture of the Tv working

                https://i.imgur.com/sApzpaN.jpg
                does the image get any worse the longer its on or is this as bad as it gets?
                Attached Files

                Comment

                • Gemat
                  Member
                  • Nov 2014
                  • 23
                  • Ελλάδα

                  #28
                  Re: Samsung UE32D4003BW Backlight problem.

                  Originally posted by vinceroger69
                  does the image get any worse the longer its on or is this as bad as it gets?
                  This is as bad as it gets....or so...

                  Comment

                  • yohnsee
                    Semi-noob
                    • Dec 2017
                    • 198
                    • Hungary

                    #29
                    Re: Samsung UE32D4003BW Backlight problem.

                    Hello, just a wild guess.
                    Does your tv have separate t-con board? Or is it integrated on the main? I was thinking, that maybe the tcon drives the dimming signal, and if the tcon started failing, that would explain the dimming problem AND the lines.
                    But besides, you should do 2 things:
                    Make a few pictures of the whole set, without the back cover, and a few of the main board and tcon, if given sparate.
                    Your problem getting lines after some time means, that the set operates after a cold start, but as it is warming up, something goes sideways. It doesn't necessarily mean panel failure, but we should investigate the other possibilities first.
                    Cheers, Janos

                    Comment

                    • Gemat
                      Member
                      • Nov 2014
                      • 23
                      • Ελλάδα

                      #30
                      Re: Samsung UE32D4003BW Backlight problem.

                      Originally posted by yohnsee
                      Hello, just a wild guess.
                      Does your tv have separate t-con board? Or is it integrated on the main? I was thinking, that maybe the tcon drives the dimming signal, and if the tcon started failing, that would explain the dimming problem AND the lines.
                      But besides, you should do 2 things:
                      Make a few pictures of the whole set, without the back cover, and a few of the main board and tcon, if given sparate.
                      Your problem getting lines after some time means, that the set operates after a cold start, but as it is warming up, something goes sideways. It doesn't necessarily mean panel failure, but we should investigate the other possibilities first.

                      This model does not have a separate Tcon board.

                      Comment

                      • Gemat
                        Member
                        • Nov 2014
                        • 23
                        • Ελλάδα

                        #31
                        Re: Samsung UE32D4003BW Backlight problem.

                        I find the problem with the lines....
                        Accidentaly I have tear the flatcable between the panel and the t-con....

                        Bad luck.
                        After so much search and effort fixing the original problem, I created an unsolvable one.....

                        Anyway, the original problem was bypassed by cutting the dim line between the board and the psu.

                        Thanks for your input guys!

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #32
                          Re: Samsung UE32D4003BW Backlight problem.

                          Oops, I post in the wrong thread.
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                          Comment

                          • yohnsee
                            Semi-noob
                            • Dec 2017
                            • 198
                            • Hungary

                            #33
                            Re: Samsung UE32D4003BW Backlight problem.

                            Originally posted by Gemat
                            I find the problem with the lines....
                            Accidentaly I have tear the flatcable between the panel and the t-con....

                            Bad luck.
                            After so much search and effort fixing the original problem, I created an unsolvable one.....

                            Anyway, the original problem was bypassed by cutting the dim line between the board and the psu.

                            Thanks for your input guys!
                            Sorry to hear that.
                            Cheers, Janos

                            Comment

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