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Samsung UN48J6300AF TV - no power, no standby

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    Samsung UN48J6300AF TV - no power, no standby

    I'm not getting any power and there is no stand by light - it went out after a lightening storm. I figured the power supply board is the first place to start, but I'm not sure how to test for standby. At the very top of the board it shows: STB:8V ON:13V (see 1st pic below), but where exactly do I take those readings? I've already pulled the power board out so when I take the readings is it OK to test it outside of the TV?

    I'd also like to check the mainboard but I'm not sure where to start with that one.
    Attached Files
    Last edited by mildew; 11-05-2018, 10:24 AM.

    #2
    Re: Samsung UN48J6300AF TV - no power, no standby

    Those exposed ODD number 1, 3, 5, 7 pins of the connector CNM803 you can see on the top of the board are the Standby pins for the power supply.
    The MOV is not blown on the power supply board, Is the fuse still good?
    More likely the surge came through the main board via the connected devices to the TV.
    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


      #3
      Re: Samsung UN48J6300AF TV - no power, no standby

      Thanks for the quick reply.

      The power board fuse has continuity. So I need to measure voltage across pins 1 and 9 (see new pic of CNM803 below) and should I be expecting 8V or 13V? The legend makes me think 13V but it shows at the top of the board standby is 8V.

      Do I need to reconnect the power board to the TV before testing this?

      The strike did take out the cable box connected to the TV, but the DVD player was unharmed. I've also attached a pic of the mainboard.
      Attached Files

      Comment


        #4
        Re: Samsung UN48J6300AF TV - no power, no standby

        Pin 1, 3, and 5 are all connected together. You can run the power supply board by itself and it should shows about 8VDC, when the board receives the PS-ON control Voltage from the main board then it will kick up to 13VDC. So without power supply board connected to main you should see 8VDC between pin 1 and pin 9 (gnd).
        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


          #5
          Re: Samsung UN48J6300AF TV - no power, no standby

          I just checked and with board not connected to the TV:
          pins 1, 3, 5, 7 all had 12.72V


          I guess this indicates the power board isn't completely dead like I originally thought. What should i try next?

          Comment


            #6
            Re: Samsung UN48J6300AF TV - no power, no standby

            So connected the main board back in place and see if the Voltage will be at 8V or not, if it is still at 8V then you need to check the control Voltage pins, I.E. PS-ON, BLU-ON pins, it should change state when you turn the TV power switch on and off, you will need skinny probe tip to probe the EVEN number pins from the back side of the famale connector.
            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


              #7
              Re: Samsung UN48J6300AF TV - no power, no standby

              I put the power board back into the TV and the results are listed below. I noticed when i leave the ribbon cable going from the power board to the main board unplugged I get backlight, but when the ribbon cable is connected no backlight.

              Pressing the power button doesn't seem to doesn't seem to change any of the readings.

              1) 8.78v
              3) 8.78v
              5) 8.78v
              7) 8.78v

              2) 1.0v
              4) .01v
              6) .09v

              Comment


                #8
                Re: Samsung UN48J6300AF TV - no power, no standby

                You need new main 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


                  #9
                  Re: Samsung UN48J6300AF TV - no power, no standby

                  Thanks for all the help. Is there any hope of tracking down the exact point of failure on the main board? Maybe it's possible just to replace the bad component?

                  When I went order the new main board I discovered that this Samsung TV has 2 versions (TS01 and US02) - see attachment below. The TS01 main board in my TV is much less common - only the authorized Samsung Parts website seems to carry it. And the TS01 main board costs 4 times more ($220) than the US02 main board.

                  What's the likelihood the US02 main board would work in my TV? The US02 main board seems to be available everywhere (ebay, shopjimmy, etc).
                  Attached Files
                  Last edited by mildew; 11-08-2018, 10:00 PM.

                  Comment


                    #10
                    Re: Samsung UN48J6300AF TV - no power, no standby

                    What are the differences between the TS01 and the US02?? Do you have photos to share??

                    Comment


                      #11
                      Re: Samsung UN48J6300AF TV - no power, no standby

                      When I bought this TV, the only difference I knew of was the TS01 used a Samsung panel. All the other features/specs are identical. You could find the TS01 on the shelf next to the US02 - both sold as model UN48J6300AF.

                      If you look at the attachment in my previous post it lists the parts for both versions.
                      Panels: different part numbers
                      Main board: different part numbers
                      Power supply: same part numbers
                      TCon: different part number

                      See link below for a pic of the 2 main boards side by side. There are additional pics of my TS01 main board in my earlier posts.

                      https://www.badcaps.net/forum/attach...1&d=1587352351
                      Attached Files

                      Comment


                        #12
                        Re: Samsung UN48J6300AF TV - no power, no standby

                        You need the correct mainboard. Mainboard, tcon, and panel all go together. Usually.

                        Comment


                          #13
                          Re: Samsung UN48J6300AF TV - no power, no standby

                          Originally posted by tvtimmy View Post
                          you need the correct mainboard. Mainboard, tcon, and panel all go together. Usually.
                          +100

                          Comment


                            #14
                            Re: Samsung UN48J6300AF TV - no power, no standby

                            https://www.shopjimmy.com/samsung-bn...j6300afxza.htm

                            Comment

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