Samsung UN46D6000SFXZA Standby Light Flashing

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  • BrunoHJD
    New Member
    • May 2015
    • 5
    • USA

    #1

    Samsung UN46D6000SFXZA Standby Light Flashing

    I picked up a Samsung UN46D6000SFXZA recently, I did so knowing it didn't work and needed to be diagnosed and repaired.

    When the TV is plugged in the standby light does a double flash 5 times then goes solid for a few seconds and the cycle repeats. If I put my ear close to the power supply board I can hear what sounds like 5 clicks. The clicks happen while the standby light is solid red and the clicking stops while the light is flashing.
    I did a bit of research and have taken the TV apart and performed some of the tests in this document. http://www.toms-service-manuals.com/...df&mfg=Samsung

    When I disconnect the cable from the power supply board to the mainboard the back lighting does NOT light up. It acts in the exact same manner with the cable plugged in or unplugged.

    I figured I would start by testing the two 5v pins. When I tested pin 4 of the power supply I had an intermittent reading. It would sit around 0.1v then spike to 3.1v and it seems as though the spikes were in time with the clicking sound coming from the power supply but its hard to say for sure because of how fast the readings were changing. So I went down the list and tested some of the low voltage pins too

    Pin 1 shows no power

    Pin 2 rests at .012v and spikes to 0.3v

    Pin 3 shows no power

    Pin 7 rests at 0.1v and spikes to 2.9v

    Pin 9 rests at 0.6v and spikes to 1v

    Pin 10 rested at 0.6v and would spike to 1v

    I also tried disconnecting the T-con board and still had the same clicking sound and flashing standby light but I didn't check the power supply pin voltages at the time.

    All the components on the board physically appear to be in OK condition, no discoloration or ballooned out capacitors. While I know this doesn't mean those components aren't bad, I just figured I would point it out. The model number on the power supply board is BN44-00423A.

    Any help would be greatly appreciated and please let me know of any additional information I should provide.

    -Harry
    Last edited by BrunoHJD; 07-05-2015, 02:13 PM.
  • sordids999
    Badcaps Legend
    • May 2013
    • 2152
    • uk

    #2
    Re: Samsung UN46D6000SFXZA Standby Light Flashing

    Posting pictures of the back of your tv showing the boards with clear pictures may help you more with fixing your problem

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Samsung UN46D6000SFXZA Standby Light Flashing

      Without the connector designator number and no pin names for each pin then the Voltage readings report does not help since we have no ideas what each pin of the connector are for.
      Last edited by budm; 07-05-2015, 04:49 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

      • BrunoHJD
        New Member
        • May 2015
        • 5
        • USA

        #4
        Re: Samsung UN46D6000SFXZA Standby Light Flashing

        I took some photos with the back panel off and got in for a close shot on each board. I can take more zoomed in shots if they are needed.

        The connector I am testing is designated CN201. In The file I hyperlinked there is a "Power-Up Sequence" section on page 2. it lists the following for connector CN201

        Power-Up Sequence (CN201):
        1.Standby Voltage: Pin 4 (5Vdc)
        2.Power-ON:Pin 2 (Low-Hi voltage transition)
        3.Low Voltages:Pin 1, 3, 7, 9, 11, 12, 13
        4.Backlight On:Pin 10 (5Vdc)

        The results I listed are the readings I obtained from checking those pins.
        Attached Files

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Samsung UN46D6000SFXZA Standby Light Flashing

          So right now your standby Voltage is not stable "It would sit around 0.1v then spike to 3.1v"
          And if you disconnect the cable between power supply and main board, is the standby Voltage stable?
          At this point, it looks like you do have problem with the power supply/LED driver board.
          There is repair kit for this board.
          http://www.shopjimmy.com/catalogsear...?q=BN44-00423A
          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

          • BrunoHJD
            New Member
            • May 2015
            • 5
            • USA

            #6
            Re: Samsung UN46D6000SFXZA Standby Light Flashing

            I just tried unplugging the cable from the mainboard to the power supply and the clicking becomes constant. The voltage is now continuously bouncing between 3.3v and 3.8v on pin 4. If I reconnect the cable it returns to a cycle of 5 clicks and the voltage returns to 0.1v constant with a 3.1v spike while its clicking.

            Do you think that repair kit would fix this particular problem or should I just go for a new power supply board?

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Samsung UN46D6000SFXZA Standby Light Flashing

              "Do you think that repair kit would fix this particular problem or should I just go for a new power supply board?" I have no idea, you need to look at the parts in the kit to see what section of the board is being repaired. We do not have the diagram for the board so you will have to trace out the connections on the board, get the spec sheet of the parts so you can start checking the Voltage feeding each section of the board. I hope you are good at drawing up diagram after tracing out the board, I would look at the standby power supply section first.
              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

              • BrunoHJD
                New Member
                • May 2015
                • 5
                • USA

                #8
                Re: Samsung UN46D6000SFXZA Standby Light Flashing

                I just wanted to post a quick follow up for anyone that owns this model and is experiencing the same issue with similar test results. I replaced the power supply board and the TV powered up and is working without any issues.

                Comment

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