Samsung UE46D6500 doesn't turn on and clicks

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  • voxahbc
    Member
    • Mar 2020
    • 10
    • Turkey

    #1

    Samsung UE46D6500 doesn't turn on and clicks

    Hello guys. I have a problem with my Samsung LED Tv UE46D6500 and hope to find a cheaper soultion with your helps.

    Here is the situation. I have this tv since 2011 and never had any problem, never got repaired and even cover opened. Recently it's started to not turn on. When I plug the cord stand by led lights steady. When push to button to turn on "Smart TV" logo shows up and turns off with an endless cycle.

    I opened the back cover to control the boards as general symptoms shared by people led me to check the capacitors. During the cycle the power board clicks. All capacitors are in very good physical condition, no burn or color change visible. No cracked or bad solder joints visible.

    With a multimeter I checked the fuses and they're all good. To identify which board has problems I removed 22pin (to the main board) cable and cables to the led panel then did some measures. Here are the readings:

    1 OD_LEVEL 5.3V Max - fluctuating
    3 OD_ON/OFF 5V Max - fluctuating
    5 GND Continuity checked - OK
    7 B13V 12.8V Max- fluctuating
    9 B13V 12.8V Max- fluctuating
    11 Vamp 13V - constant
    13 Vamp 13V - constant
    15 GND Continuity checked - OK
    17 B5V 0V
    19 B5V 5.4V - constant
    21 N. C 5.4V - constant

    2 P_DIM4 0V
    4 P_DIM3 0V
    6 P_DIM2 0V
    8 P_DIM1 0V
    10 B13V 12.8V Max - fluctuating
    12 BLU 4.8V - constant
    14 GND Continuity checked - OK
    16 GND Continuity checked - OK
    18 A5V 0V
    20 POWER 5.4V - constant
    22 N. C 3.4V - constant

    Fluctuations are between 0V and the max reading.

    There are two high voltage (450V) capacitors and they gave me around 380V



    With the results above I assume power board has problem, so any idea, experience or helps to identify where the problem is, are appreciated. I also attached the photos of the power board. Thanks
    Attached Files
    Last edited by voxahbc; 03-29-2020, 12:42 PM. Reason: Spelling
  • Hamie
    Badcaps Legend
    • Apr 2014
    • 1383
    • UK

    #2
    Re: Samsung UE46D6500 doesn't turn on and clicks

    Mainboard likely.
    Unplug the mainboard and test voltages again.
    With mainboard unplugged backlight should come on and stay on.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Samsung UE46D6500 doesn't turn on and clicks

      "17 B5V 0V
      19 B5V 5.4V - constant

      21 N. C 5.4V - constant
      18 A5V 0V"
      Are you sure you count the pins correctly? Look at some of your readings, they do not look right.
      Without Standby A5 power supply then you cannot have ANY control Voltages, i.e. PS-ON, BLU, etc. but you are showing you do have them. The Standby power supply output is connected to the pull-up resistors to simulate control signals when power supply is not connected to the main board to perform power supply board self-test.
      Power supply board BN44-00427A
      https://www.shopjimmy.com/samsung-bn...upply-unit.htm
      Last edited by budm; 03-29-2020, 03:26 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

      • voxahbc
        Member
        • Mar 2020
        • 10
        • Turkey

        #4
        Re: Samsung UE46D6500 doesn't turn on and clicks

        Originally posted by budm
        "17 B5V 0V
        19 B5V 5.4V - constant

        21 N. C 5.4V - constant
        18 A5V 0V"
        Are you sure you count the pins correctly? Look at some of your readings, they do not look right.
        Without Standby A5 power supply then you cannot have ANY control Voltages, i.e. PS-ON, BLU, etc. but you are showing you do have them. The Standby power supply output is connected to the pull-up resistors to simulate control signals when power supply is not connected to the main board to perform power supply board self-test.
        Power supply board BN44-00427A
        https://www.shopjimmy.com/samsung-bn...upply-unit.htm
        You're right. Somehow, I think in an absence of mind I included pins 21 and 22 and made a shifting in both reading and the table. Anyway I redid the measurement with same conditions (like I did in the previous, all cables except 220V power are disconnected). Here are new readings:

        1 OD_LEVEL 5.3V Max - fluctuating
        3 OD_ON/OFF 5V Max - fluctuating
        5 GND Continuity checked - OK
        7 B13V 12.8V - fluctuating
        9 B13V 12.8V- fluctuating
        11 Vamp 12.5V - fluctuating
        13 Vamp 12.9 V - fluctuating
        15 GND Continuity checked - OK
        17 B5V 5.4V - fluctuating
        19 B5V 5.4V - fluctuating

        2 P_DIM4 0V
        4 P_DIM3 0V
        6 P_DIM2 0V
        8 P_DIM1 0V
        10 B13V 12.8V- fluctuating
        12 BLU 4.8V - fluctuating
        14 GND Continuity checked - OK
        16 GND Continuity checked - OK
        18 A5V 5.4V - constant
        20 POWER 3.4V - constant
        Last edited by voxahbc; 03-30-2020, 03:33 AM. Reason: Spelling

        Comment

        • nomoresonys
          Badcaps Legend
          • Jan 2013
          • 12085
          • U.S.

          #5
          Re: Samsung UE46D6500 doesn't turn on and clicks

          Ok, now do the same test with everything hooked up and connected, example of testing in #2 below.
          Last edited by nomoresonys; 03-30-2020, 08:53 AM.

          Comment

          • voxahbc
            Member
            • Mar 2020
            • 10
            • Turkey

            #6
            Re: Samsung UE46D6500 doesn't turn on and clicks

            Originally posted by nomoresonys
            Ok, now do the same test with everything hooked up and connected, example of testing in #2 below.
            Here are the readings for two conditions:

            1- All the cables connected and TV in stand-by mode (not pushed the power button):

            1 OD_LEVEL 0V
            3 OD_ON/OFF 0V
            5 GND Continuity checked - OK
            7 B13V 0V
            9 B13V 0V
            11 Vamp 0V
            13 Vamp 0V
            15 GND Continuity checked - OK
            17 B5V 0V
            19 B5V 0V

            2 P_DIM4 0V
            4 P_DIM3 0V
            6 P_DIM2 0V
            8 P_DIM1 0V
            10 B13V 0V
            12 BLU 0V
            14 GND Continuity checked - OK
            16 GND Continuity checked - OK
            18 A5V 5.4V - constant
            20 POWER 0.25V - constant


            2- All the cables connected, pushed the power button to turn on and TV started to cycle and click:

            1 OD_LEVEL 4.8V Max - fluctuating
            3 OD_ON/OFF 4.8V Max - fluctuating
            5 GND Continuity checked - OK
            7 B13V 12.8V - fluctuating
            9 B13V 12.8V- fluctuating
            11 Vamp 12.8V - fluctuating
            13 Vamp 12.8V - fluctuating
            15 GND Continuity checked - OK
            17 B5V 5.4V - fluctuating
            19 B5V 5.4V - fluctuating

            2 P_DIM4 3.3V- fluctuating
            4 P_DIM3 3.3V- fluctuating
            6 P_DIM2 3.3V- fluctuating
            8 P_DIM1 3.3V- fluctuating
            10 B13V 12.8V- fluctuating
            12 BLU 5V - fluctuating
            14 GND Continuity checked - OK
            16 GND Continuity checked - OK
            18 A5V 5.4V - constant
            20 POWER Either 0.25 or 3.3V with the cycle

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12085
              • U.S.

              #7
              Re: Samsung UE46D6500 doesn't turn on and clicks

              Maybe weak/bad startup caps or voltage regulating diode??

              Comment

              • diif
                Badcaps Legend
                • Feb 2014
                • 6978
                • England

                #8
                Re: Samsung UE46D6500 doesn't turn on and clicks

                I've had a couple of almost identical Samsung TVs from the same year that showed the Smart TV logo and restarted over and over.
                It was bad blocks on the Samsung NAND on the mainboard.

                Comment

                • voxahbc
                  Member
                  • Mar 2020
                  • 10
                  • Turkey

                  #9
                  Re: Samsung UE46D6500 doesn't turn on and clicks

                  Thanks for replies. So what do you think guys? Is it power suplly board or mainboard issue? From the readings, I don't think it's mainboard, I assume it's power supply board because it flactuates while mainboard cable disconnected. But the crtitical point with the given conditions (readings and no visible defects) what could be the actual problem to address? capacitors or any other components? I'm asking this because if it's something easy (desolder/solder and change components etc.) I'll go by myself. Otherwise I'll look for a power supply board replacement. Thanks.

                  Comment

                  • nomoresonys
                    Badcaps Legend
                    • Jan 2013
                    • 12085
                    • U.S.

                    #10
                    Re: Samsung UE46D6500 doesn't turn on and clicks

                    Easy test, with tv unplugged from power, check all the diodes on powerboard, try diode mode, should get a reading in one direction, reverse meter probes, should read 1 or OL if any read off, take out of circuit and test again.
                    Last edited by nomoresonys; 04-07-2020, 10:27 AM.

                    Comment

                    • nomoresonys
                      Badcaps Legend
                      • Jan 2013
                      • 12085
                      • U.S.

                      #11
                      Re: Samsung UE46D6500 doesn't turn on and clicks

                      Good testing video there: https://www.youtube.com/watch?v=ocqnqmBxiqY

                      Comment

                      • nomoresonys
                        Badcaps Legend
                        • Jan 2013
                        • 12085
                        • U.S.

                        #12
                        Re: Samsung UE46D6500 doesn't turn on and clicks

                        Guess the question is, should the voltages be stable with the mainboard unplugged or should they fluctuate if they should be stable then there's a problem on powerboard side.

                        Comment

                        • MANNOFSTEEL
                          New Member
                          • Dec 2019
                          • 2
                          • United States

                          #13
                          Re: Samsung UE46D6500 doesn't turn on and clicks

                          can you post a pic of the mainboard ( back)

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: Samsung UE46D6500 doesn't turn on and clicks

                            Can we see good clear pictures of the whole backside of the TV showing all the boards?

                            18 A5V 5.4V - constant
                            20 POWER Either 0.25 or 3.3V with the cycle Right now the standby power supply is steady but the main board is not sending out solid HI command signal (PS-ON/POWER) to turn on the rest of the power supply.
                            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

                            • voxahbc
                              Member
                              • Mar 2020
                              • 10
                              • Turkey

                              #15
                              Re: Samsung UE46D6500 doesn't turn on and clicks

                              Thhanks for replies again. I'm sending detailed photos of all the boards.
                              Attached Files

                              Comment

                              • nomoresonys
                                Badcaps Legend
                                • Jan 2013
                                • 12085
                                • U.S.

                                #16
                                Re: Samsung UE46D6500 doesn't turn on and clicks

                                Well did you check al the diodes per post #10??

                                Comment

                                • voxahbc
                                  Member
                                  • Mar 2020
                                  • 10
                                  • Turkey

                                  #17
                                  Re: Samsung UE46D6500 doesn't turn on and clicks

                                  Originally posted by nomoresonys
                                  Well did you check al the diodes per post #10??
                                  I just did. I got a bad diode shorted. It blinks red on the multimeter either way. The others passed the diode test.
                                  Attached Files
                                  Last edited by voxahbc; 04-09-2020, 02:25 PM.

                                  Comment

                                  • nomoresonys
                                    Badcaps Legend
                                    • Jan 2013
                                    • 12085
                                    • U.S.

                                    #18
                                    Re: Samsung UE46D6500 doesn't turn on and clicks

                                    Ok, easy way to verify is just clip a leg in the middle so it will be easy to re-solder if it's ok and retest out of circuit.
                                    Last edited by nomoresonys; 04-09-2020, 02:44 PM.

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #19
                                      Re: Samsung UE46D6500 doesn't turn on and clicks

                                      Originally posted by voxahbc
                                      I just did. I got a bad diode shorted. It blinks red on the multimeter either way. The others passed the diode test.
                                      The diode D9601 tested bad in the circuit because it is connected in parallel with LOW Ohms resistor R960, you can look at the bottom side of the board to see how the Diode and the resistor are connected together.

                                      Samsung BN44-00427A
                                      https://www.shopjimmy.com/samsung-bn...pply-unit.htm#

                                      BTW, we never get to see what Voltages you have (you power up just the power supply board) on the power supply connector when the connector from the power supply NOT connected to the main board.
                                      Last edited by budm; 04-09-2020, 04:30 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

                                      • neilc6
                                        Badcaps Legend
                                        • Nov 2015
                                        • 1550
                                        • Canada

                                        #20
                                        Re: Samsung UE46D6500 doesn't turn on and clicks

                                        Have seen lots of main board issues with the D series. Try freezing the NAND with upside can of duster and see if it turns on.

                                        Comment

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