Samsung UN60D6000 LED Backlight flashing

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  • ljintexas
    LJinTexas
    • Jan 2015
    • 669
    • USA

    #21
    Re: Samsung UN60D6000 LED Backlight flashing

    When I unplug the main board cable and apply AC power to the SMPS, I have one click, and 211 volts DC to each of the LED arrays. The board says it should be 333 volts DC. If I leave it plugged in for say an hour, the two large transformers with the silver heatsinks in the center of the board get what I would term Hot.

    Thanks to All

    LJ

    Comment

    • ljintexas
      LJinTexas
      • Jan 2015
      • 669
      • USA

      #22
      Re: Samsung UN60D6000 LED Backlight flashing

      Is it safe to say that thus far, the smps has issues as it does not fire the LEDs with the Main Board cable disconnected and AC supplied to the board??

      Thanks

      LJ

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #23
        Re: Samsung UN60D6000 LED Backlight flashing

        I would like to verify the DCV between the two legs of the main filter cap CP804 in the primary side, then the DCV between the two legs of the caps CM851, 852 LED driver power supply in the cold side, this done with just the power supply board by itself.
        The next test you need to leave the two probes of the meter on cap C9155 legs then apply the power to the board to see how high the Voltage goes up to and then wait a few seconds to see how low the Voltage drops down too, then do the same again on cap C9255.
        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

        • ljintexas
          LJinTexas
          • Jan 2015
          • 669
          • USA

          #24
          Re: Samsung UN60D6000 LED Backlight flashing

          Thank you Bud. I will perform the tests and post back the results this evening. To clarify, should the LED feeds be plugged into the PS board or unplugged when performing these tests?

          I appreciate your help very much.

          LJ
          Last edited by ljintexas; 06-13-2016, 12:18 PM.

          Comment

          • ljintexas
            LJinTexas
            • Jan 2015
            • 669
            • USA

            #25
            Re: Samsung UN60D6000 LED Backlight flashing

            I see where you say to do the tests with just the PS board by itself..sorry for the stupid question!

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #26
              Re: Samsung UN60D6000 LED Backlight flashing

              Originally posted by ljintexas
              Thank you Bud. I will perform the tests and post back the results this evening. To clarify, should the LED feeds be plugged into the PS board or unplugged when performing these tests?

              I appreciate your help very much.

              LJ
              Try both.
              Opps, I have your board mixed up with another OP so disregard as to what I said about the 25V and the tabs.
              Last edited by budm; 06-13-2016, 12:31 PM.
              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

                #27
                Re: Samsung UN60D6000 LED Backlight flashing

                BTW, I need good clear straight shot pictures of the bottom side of the power supply board, shopjimmy does not have the pictures I need to trace out the board.
                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

                • ljintexas
                  LJinTexas
                  • Jan 2015
                  • 669
                  • USA

                  #28
                  Re: Samsung UN60D6000 LED Backlight flashing

                  Thanks Bud... I will try both

                  I am charging up my 16 mp camera for a shot of the bottom of the board.

                  Will post tonight.

                  Thank You Sir

                  Comment

                  • ljintexas
                    LJinTexas
                    • Jan 2015
                    • 669
                    • USA

                    #29
                    Re: Samsung UN60D6000 LED Backlight flashing

                    There is no difference in the readings whether the LED harnesses are plugged in or not:
                    CP804 390.6 Volts DC leg to leg
                    CM851 217 Volts DC
                    CM852 217 Volts DC

                    Both C9155 and C9255 measured 216.7 Volts DC very stable..no drop off

                    Thanks

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #30
                      Re: Samsung UN60D6000 LED Backlight flashing

                      OK, so the PS-ON is OK because you do have the 390VDC on the main cap.
                      In the LED driver power supply, the input Voltage to the LED boost converter circuit is 217V (CM851), the output of the Boost converter is also 217V (C9155) so the Boost converter is not working.
                      So we need to verify for sure if you do have BL-ON (BLU-ON) signal at the power supply board connector or not.
                      BTW, did you leave the probes on this cap when you power up the board? I want to make sure IF you see the Voltage jumps up above 217vdc or not.
                      If the BL-ON is present and you did not see the Voltage on cap C9155/9255 jumps up above 217V then for sure the Booster circuit is not active and we need to find out why.
                      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

                      • ljintexas
                        LJinTexas
                        • Jan 2015
                        • 669
                        • USA

                        #31
                        Re: Samsung UN60D6000 LED Backlight flashing

                        I did leave the probes on and it did not jump up above 217 volts.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #32
                          Re: Samsung UN60D6000 LED Backlight flashing

                          OK, I will wait to see the pictures of the bottom side of the board to locate the LED driver/controller IC.
                          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

                          • ljintexas
                            LJinTexas
                            • Jan 2015
                            • 669
                            • USA

                            #33
                            Re: Samsung UN60D6000 LED Backlight flashing

                            I will verify BLU_ON at connector with main board disconnected.. I did see 5.3 volts on that pin when main board was connected.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #34
                              Re: Samsung UN60D6000 LED Backlight flashing

                              Originally posted by ljintexas
                              I will verify BLU_ON at connector with main board disconnected.. I did see 5.3 volts on that pin when main board was connected.
                              If you did have DCV of >2.5V on the BL-ON, then more likely something in the LED driver circuit is the problem.
                              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

                              • ljintexas
                                LJinTexas
                                • Jan 2015
                                • 669
                                • USA

                                #35
                                Re: Samsung UN60D6000 LED Backlight flashing

                                Here is back side of board
                                Attached Files

                                Comment

                                • ljintexas
                                  LJinTexas
                                  • Jan 2015
                                  • 669
                                  • USA

                                  #36
                                  Re: Samsung UN60D6000 LED Backlight flashing

                                  Would that be the 16 leg IC on center right side of board?

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #37
                                    Re: Samsung UN60D6000 LED Backlight flashing

                                    https://www.badcaps.net/forum/attach...8&d=1465875250
                                    Bottom left, 20-pin SMD in the section where the two LED connectors are.
                                    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

                                    • ljintexas
                                      LJinTexas
                                      • Jan 2015
                                      • 669
                                      • USA

                                      #38
                                      Re: Samsung UN60D6000 LED Backlight flashing

                                      Slc4011m
                                      bt9l 13gu

                                      Comment

                                      • ljintexas
                                        LJinTexas
                                        • Jan 2015
                                        • 669
                                        • USA

                                        #39
                                        Re: Samsung UN60D6000 LED Backlight flashing

                                        Thanks Bud for helping me find the source of the problem!

                                        Comment

                                        • ljintexas
                                          LJinTexas
                                          • Jan 2015
                                          • 669
                                          • USA

                                          #40
                                          Re: Samsung UN60D6000 LED Backlight flashing

                                          I can only find this IC from China.. Aaaargh!

                                          Comment

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