Samsung UN46ES6100 / no backlight

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  • Plaxus
    New Member
    • Nov 2019
    • 7
    • Canada

    #1

    Samsung UN46ES6100 / no backlight

    I am trying to diagnose/repair a Samsung UN46ES6100 LED TV with no backlight. I have done the flashlight test and there is an image on the screen. Audio works fine as well.

    Testing the voltage from the BN44-00502a power supply to the LED backlight strips, (see attached photo) - the readings are as follows:

    both R+ = fluctuating between 250-265V

    R- and L+ = fluctuating, around 1-2V

    both L- fluctuating between 1-3V

    My understanding is that these should be steady DC voltage, not fluctuating. I suppose the fact that it's only reading 1V in the Left side of the circuit is the problem. How would I go about further isolating the problem?
    Attached Files
  • CapLeaker
    Leaking Member
    • Dec 2014
    • 7976
    • Canada

    #2
    Re: Samsung UN46ES6100 / no backlight

    probably bad backlights. The LEDs are current controlled, not voltage controlled.

    Comment

    • Plaxus
      New Member
      • Nov 2019
      • 7
      • Canada

      #3
      Re: Samsung UN46ES6100 / no backlight

      I'll admit I'm a noob, but just for my understanding should the voltage from the board not be identical through left and right? I forgot to mention I have the same dissimilar readings with the cable disconnected as well.

      So there are the backlight parts: https://www.tvparts.ca/tvdetail.php?id=10707

      There are no LED bulbs, that I can see, only the left and right strips.
      Part #s BN96-21462A, and 63A

      Comment

      • R_J
        Badcaps Legend
        • Jun 2012
        • 9514
        • Canada

        #4
        Re: Samsung UN46ES6100 / no backlight

        If you look at the bottom of the board you will see your answer.
        pins 2,3 (R+) are the supply voltage for the led string, pins 5,7 are connected together, only to join the two led strings. pins 9,10 are the return line. You have an open led string, thats why you have the high fluctuating voltage on pins 2,3 and not any others.

        If the leds were all working you would have about 190v on pins2,3. approx 90v on pins 5,7 and likely 10~15v on the return pins 9,10.
        What do you mean you can see no "LED bulbs" what did you expect?
        The LED'S are mounted to the LED strips.
        Last edited by R_J; 11-10-2019, 06:17 PM.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Samsung UN46ES6100 / no backlight

          Are you testing those Voltages with the LED connector in place?
          What did you for meter ground probe?
          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

          • Plaxus
            New Member
            • Nov 2019
            • 7
            • Canada

            #6
            Re: Samsung UN46ES6100 / no backlight

            Originally posted by budm
            Are you testing those Voltages with the LED connector in place?
            What did you for meter ground probe?
            Those reading are with the connector in place, but I have tested with the connector unplugged as well.
            I have my multimeter black probe on the tv chassis.

            Comment

            • Plaxus
              New Member
              • Nov 2019
              • 7
              • Canada

              #7
              Re: Samsung UN46ES6100 / no backlight

              Originally posted by R_J
              What do you mean you can see no "LED bulbs" what did you expect?
              The LED'S are mounted to the LED strips.
              I was expecting to see strips running horizontally across the tv, similar to the ones in this image.
              Attached Files

              Comment

              • R_J
                Badcaps Legend
                • Jun 2012
                • 9514
                • Canada

                #8
                Re: Samsung UN46ES6100 / no backlight

                In this panel the screen is edge lit. It could be a simple as a bad connection or likely one of the led's is open.
                Attached Files

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Samsung UN46ES6100 / no backlight

                  Based on the Voltage reading on post 1, it has open circuit in the LED string.
                  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

                  • neilc6
                    Badcaps Legend
                    • Nov 2015
                    • 1550
                    • Canada

                    #10
                    Re: Samsung UN46ES6100 / no backlight

                    The ES series are slim edge lit models and tricky to replace the backlights. First one I did, a 55", I damaged the panel in the corner by forcing the frame in place and it was probably not sitting flush. It was tolerable but some double sided tape on the edges had floated into the screen area and I cracked the screen lifting the corner up by the weakened area to move the tape back. Was planning to keep the TV for myself.

                    Here are your strips from a trusted seller. Looks like it could be 2D with 6 pin connector https://ebay.us/HoYUef or 3D with 10 pin connector https://ebay.us/x0ssiG

                    Some tips -

                    The small Philips screws holding the panel edge cover and bezel strip very easily. You will need to drill out if you do.

                    There is double sided tape/rubber on the edges holding the panel to the plastic bezel.

                    There is very little edge to the bezel holding the lcd panel. Make sure it is sitting flush before replacing the outer frame. Do not force the frame in place which is how I cracked my screen.

                    Comment

                    • Plaxus
                      New Member
                      • Nov 2019
                      • 7
                      • Canada

                      #11
                      Re: Samsung UN46ES6100 / no backlight

                      I appreciate the help from everyone.

                      I opened it up the TV to get to the LED strips I see a black spot on one of the LEDs.

                      I have access to a bench power supply at work, so I'll take it in to try to confirm.

                      I see that there are individual LEDs available, but this style looks difficult to work with. Does anyone have any instructions or videos that would help with this?
                      If I'm unable to do it on my own I will eventually look into buying a whole replacement strip.
                      Attached Files

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Samsung UN46ES6100 / no backlight

                        I would replace the whole set of the strip, one LED already failed so it is better to replace all the strips at once instead of taking panel apart again when other LED's fail.
                        Then turn down the backlights level to as low as you can on all inputs to extend the life of the LED's.
                        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

                        • Plaxus
                          New Member
                          • Nov 2019
                          • 7
                          • Canada

                          #13
                          Re: Samsung UN46ES6100 / no backlight

                          Originally posted by budm
                          I would replace the whole set of the strip, one LED already failed so it is better to replace all the strips at once instead of taking panel apart again when other LED's fail.
                          Ok thanks, I can see why that would be a good plan.

                          Comment

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