Samsung UN40ES6100 no backlight

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #21
    Re: Samsung UN40ES6100 no backlight

    http://www.electronica-usa.com/product_BN96-21460A.html
    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

    • dsc
      Senior Member
      • Aug 2015
      • 53
      • USA

      #22
      Re: Samsung UN40ES6100 no backlight

      As always thank you Bud, a quick question though.
      I was attempting to source a scavenged part locally. One of the very few repair guys remaining on the cape questioned the fact that the right string of lights was fine and didn't flash when I powered up the set, nor did it illuminate when I had the main board disconnected. He said that I should be looking for other problems still as he has seen some sets with just half the pic illuminated. Any thoughts?
      As a side note, he has been doing a large amount of warranty work on LG's as they are experiencing backlight trouble and even has successfully replaced a set where the customer threw the remote at the tv and cracked the screen because of the premature failure.

      Comment

      • dsc
        Senior Member
        • Aug 2015
        • 53
        • USA

        #23
        Re: Samsung UN40ES6100 no backlight

        So for further advancement, I now get a quick flash of the led's when I plug in the PS, main disconnected.
        Any advice where to look now?

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: Samsung UN40ES6100 no backlight

          Originally posted by dsc
          So for further advancement, I now get a quick flash of the led's when I plug in the PS, main disconnected.
          Any advice where to look now?
          So now all the LED strings do flash on for second?
          On post 19 you indicated 'I found that the left string of led's was fine but the right side had no less than 10 not functioning at all.'
          What did you do?
          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

          • dsc
            Senior Member
            • Aug 2015
            • 53
            • USA

            #25
            Re: Samsung UN40ES6100 no backlight

            I removed the bad string, right side less tested ok individually. Located a known working left string that I borrowed for testing. I installed the PS only and plugged it in. All leds flashed once. Tried again and a few less flashed, third time only a few on each side flashed. Allowed it to sit for a while and tried again with the same results.
            In all I have replaced the IC, two surface caps.
            When I first got the set the leds did not flash at all. They only flashed after surface caps were replaced.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #26
              Re: Samsung UN40ES6100 no backlight

              So the bottom line is that each LED on all the strips tested OK, right?
              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

              • dsc
                Senior Member
                • Aug 2015
                • 53
                • USA

                #27
                Re: Samsung UN40ES6100 no backlight

                Yes, all of the ones on my original right side tested good, though a couple were slightly dimmer.
                The left side I borrowed were all good and even in illumination. I had to return the left one so I am now back to just one good side, which by the way does the same single flash.

                Comment

                • dsc
                  Senior Member
                  • Aug 2015
                  • 53
                  • USA

                  #28
                  Re: Samsung UN40ES6100 no backlight

                  Sorry for the confusion, in post 19 I incorrectly listed the strings. When I pulled them I noticed what I had done (my having thought as a mechanic) and then started to reference them correctly.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #29
                    Re: Samsung UN40ES6100 no backlight

                    Can you leave the meter probes on the two legs of the cap C9110, then plug the TV into the outlet and turn it on and observe what you see on the meter (meter should be set to 200Vdc scale or higher)?
                    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

                    • dsc
                      Senior Member
                      • Aug 2015
                      • 53
                      • USA

                      #30
                      Re: Samsung UN40ES6100 no backlight

                      I'll do that tonight, I haven't looked at the cap, do I need to be concerned about polarity?

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #31
                        Re: Samsung UN40ES6100 no backlight

                        Black on negative leg, red on positive leg.
                        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

                        • dsc
                          Senior Member
                          • Aug 2015
                          • 53
                          • USA

                          #32
                          Re: Samsung UN40ES6100 no backlight

                          Ah, just looked at the photo of the board and see the cap you are instructing me on, easy enough.
                          Sorry for the daft question, I was picturing a board mount cap for some reason.
                          Will post the results later.
                          Thank you again for your guidance.

                          Comment

                          • dsc
                            Senior Member
                            • Aug 2015
                            • 53
                            • USA

                            #33
                            Re: Samsung UN40ES6100 no backlight

                            I came up with 260, it was bouncing around a bit, 257 to 263 then settled to the 260.3 range

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #34
                              Re: Samsung UN40ES6100 no backlight

                              If you look at the chart on the power supply board, the LED Voltage is printed as 191V 367mA, so to me the load (LED strings) is no good and allow the Voltage to go up very high.
                              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

                              • dsc
                                Senior Member
                                • Aug 2015
                                • 53
                                • USA

                                #35
                                Re: Samsung UN40ES6100 no backlight

                                I get the same voltage with the LED disconnected too, from what I have read that should be correct?
                                Last edited by dsc; 12-09-2015, 08:36 PM. Reason: didn't finish

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #36
                                  Re: Samsung UN40ES6100 no backlight

                                  No load Voltage (LEDs string not connected) will be higher then when the Load is connected. Some circuit will go into protection mode when it detect higher Voltage than it should be. In your case, 260VDC is not normal.
                                  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

                                  • dsc
                                    Senior Member
                                    • Aug 2015
                                    • 53
                                    • USA

                                    #37
                                    Re: Samsung UN40ES6100 no backlight

                                    Seems as if everyone, including Electronica, is sold out on the LED strips.
                                    Trying to source out the LED's themselves is proving to be frustrating too.

                                    Comment

                                    • flocko
                                      Badcaps Legend
                                      • Nov 2012
                                      • 1121
                                      • uk

                                      #38
                                      Re: Samsung UN40ES6100 no backlight

                                      I think I have the LED edge boards that you need But I am in the UK? they come from a UE40ES6300 and show part numbers R20491 40DBTF+ L20217 40DBTF. do they sound like the right ones?. I dont think you will find replacement LEDs as they are side mounted and these are the first of this kind I have come across , unlike the LEDs fitted to LG/Sony edge lights you find in most sets

                                      Comment

                                      • dsc
                                        Senior Member
                                        • Aug 2015
                                        • 53
                                        • USA

                                        #39
                                        Re: Samsung UN40ES6100 no backlight

                                        @ flocko
                                        The part numbers that comes up for my set is BN96-21460A and BN96-21461A.
                                        I looked up the numbers you listed, they look similar but the connection wiring is different.
                                        I have two blue and one white on one side and two black and one white on the other.
                                        These LEDs are interesting, side tang surface mounted.

                                        Comment

                                        • flocko
                                          Badcaps Legend
                                          • Nov 2012
                                          • 1121
                                          • uk

                                          #40
                                          Re: Samsung UN40ES6100 no backlight

                                          Yes see they look the same ( did you see my listing on ebay UK) but have now seen you have a BN44-00502A supply, the set that these come out of has a BN44-00518A so LED output connector not the same, I have not seen any other set that has these side mounted LEDs, the norm is back mount. Good luck the search goes on Flocko

                                          Comment

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