Samsung LN46D630 no picture

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  • Bloup101
    Member
    • Mar 2019
    • 15
    • Canada

    #1

    Samsung LN46D630 no picture

    Hello I'm by no means savvy but I can spot boldged caps and do basic soldering. I've fixed e few TVs but this one has me stomped. Visually everything look good. The TV has the same symptoms as the following post.
    https://www.badcaps.net/forum/showthread.php?t=53599
    Audio but no picture, if I disconnect the inverter board the LCDs come on for half a second.

    BLU_ON 5.05v
    PS_ON 4.87v
    CP802 158v should be 380-390v? 515 ohm
    CP803 158v should be 380-390v? 515 ohm
    DP810 445 ohm
    Inverters 841 ohm
    CP801 481 ohm
    CP802 481 ohm
    CI1818 0 ohm is this expected?
    CX802S 0 ohm
    CX802S 0 ohm
    Both fuse are good
    CM811 450 ohm
    CM809 199 ohm shouldn't it be the same as CM811 they are the same part?
    Last edited by Bloup101; 06-15-2019, 03:52 PM.
  • nomoresonys
    Badcaps Legend
    • Jan 2013
    • 12088
    • U.S.

    #2
    Re: Samsung LN46D630 no picture

    Test connector from mainboard to powerboard on powerboard side with all boards hooked up, test with tv plugged in but off then hit power, report both conditions here, give pin number, pin description/name and condition on and off, that is where you start in most cases, it gives the helpers a lot of info. to work with. When you get the audio no picture, can you see any text or anything on screen with a flashlight by pressing menu or anything?

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Samsung LN46D630 no picture

      Skip.
      Last edited by budm; 06-15-2019, 04:44 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

        #4
        Re: Samsung LN46D630 no picture

        Originally posted by Bloup101
        Hello I'm by no means savvy but I can spot boldged caps and do basic soldering. I've fixed e few TVs but this one has me stomped. Visually everything look good. The TV has the same symptoms as the following post.
        https://www.badcaps.net/forum/showthread.php?t=53599
        Audio but no picture, if I disconnect the inverter board the LCDs come on for half a second.

        BLU_ON 5.05v
        PS_ON 4.87v
        CP802 158v should be 380-390v? 515 ohm
        CP803 158v should be 380-390v? 515 ohm
        DP810 445 ohm
        Inverters 841 ohm
        CP801 481 ohm
        CP802 481 ohm
        CI1818 0 ohm is this expected?
        CX802S 0 ohm
        CX802S 0 ohm
        Both fuse are good
        CM811 450 ohm
        CM809 199 ohm shouldn't it be the same as CM811 they are the same part?
        Right now you do not have the PFC Boosted Voltage even though the PS-ON is present. Please upload good clear straight shot pictures of the power supply board top and bottom side of YOUR board, also pictures of the whole backside of the TV showing all the boards.
        Your power supply board is BN44-??????
        Last edited by budm; 06-15-2019, 05:05 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

        • nomoresonys
          Badcaps Legend
          • Jan 2013
          • 12088
          • U.S.

          #5
          Re: Samsung LN46D630 no picture

          .
          Last edited by nomoresonys; 06-15-2019, 05:28 PM.

          Comment

          • Bloup101
            Member
            • Mar 2019
            • 15
            • Canada

            #6
            Re: Samsung LN46D630 no picture

            Bn44-00463a i46f2_bhs
            Attached Files
            Last edited by Bloup101; 06-15-2019, 05:29 PM.

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12088
              • U.S.

              #7
              Re: Samsung LN46D630 no picture

              Look closely check for bad/cold solder joints.

              Comment

              • Bloup101
                Member
                • Mar 2019
                • 15
                • Canada

                #8
                Re: Samsung LN46D630 no picture

                Looks like I can only have one attachment per post
                Attached Files

                Comment

                • Bloup101
                  Member
                  • Mar 2019
                  • 15
                  • Canada

                  #9
                  Re: Samsung LN46D630 no picture

                  Is it normal I get 2 different readings for 2 identical caps? I'm measuring on the back of the board. I set my DVM to ohm 2k and get these readings.
                  CM811 543ohm
                  CM809 880ohm
                  Both caps are 105c 25v 1000uf
                  Last edited by Bloup101; 06-15-2019, 05:40 PM.

                  Comment

                  • nomoresonys
                    Badcaps Legend
                    • Jan 2013
                    • 12088
                    • U.S.

                    #10
                    Re: Samsung LN46D630 no picture

                    So what happens if you unplug cable from powerboard to mainboard, (tv power cord unplugged of course) then plug tv power cord in, see if backlights come on.

                    Comment

                    • nomoresonys
                      Badcaps Legend
                      • Jan 2013
                      • 12088
                      • U.S.

                      #11
                      Re: Samsung LN46D630 no picture

                      Originally posted by Bloup101
                      Is it normal I get 2 different readings for 2 identical caps? I'm measuring on the back of the board. I set my DVM to ohm 2k and get these readings.
                      CM811 543ohm
                      CM809 880ohm
                      Both caps are 105c 25v 1000uf
                      Hard to get an accurate reading in circuit.

                      Comment

                      • Bloup101
                        Member
                        • Mar 2019
                        • 15
                        • Canada

                        #12
                        Re: Samsung LN46D630 no picture

                        DMV set to 200k reading is 47.5 on DP810

                        Comment

                        • nomoresonys
                          Badcaps Legend
                          • Jan 2013
                          • 12088
                          • U.S.

                          #13
                          Re: Samsung LN46D630 no picture

                          Originally posted by Bloup101
                          DMV set to 200k reading is 47.5 on DP810
                          What do you get on DP810 with meter on diode mode?

                          Comment

                          • Bloup101
                            Member
                            • Mar 2019
                            • 15
                            • Canada

                            #14
                            Re: Samsung LN46D630 no picture

                            Main board disconnected from power board: I get no sound and LED strips light up for half a second. I did the flashlight test and I see no text or image. The low and high voltage pins going to the inventer board 0v.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Samsung LN46D630 no picture

                              Originally posted by Bloup101
                              DMV set to 200k reading is 47.5 on DP810
                              Your post #1 shows: DP810 445 ohm
                              Now it shows as: set to 200k reading is 47.5, that will be 47.5K Ohms which is much higher than 445 Ohms as reported in post #1. Are you 100% sure you reading the meter correctly?
                              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

                              • Bloup101
                                Member
                                • Mar 2019
                                • 15
                                • Canada

                                #16
                                Re: Samsung LN46D630 no picture

                                DMM in diode mode reads 442 on DP810

                                Comment

                                • Bloup101
                                  Member
                                  • Mar 2019
                                  • 15
                                  • Canada

                                  #17
                                  Re: Samsung LN46D630 no picture

                                  All my readings in post 1# were in diode mode. Sorry I'm learning...

                                  Comment

                                  • Bloup101
                                    Member
                                    • Mar 2019
                                    • 15
                                    • Canada

                                    #18
                                    Re: Samsung LN46D630 no picture

                                    All boards plugged in I get 4.86v on ps_on and 5.05v on blu_on
                                    Attached Files

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #19
                                      Re: Samsung LN46D630 no picture

                                      The control signals are fine but you do not have PFC boosted Voltage so you need to check and work in the PFC section first to get that 380 ~ 400VDC on the main cap first.
                                      So you need to get the P/N of the PFC IC ICP801 to look up the spec sheet to find out which pin is the VCC pin so you can verify if the VCC is present or not for the PFC IC to run.
                                      Samsung BN44-00463A (I46F2_BHS) Power Supply Unit
                                      https://www.shopjimmy.com/samsung-bn...upply-unit.htm

                                      Repair kit:
                                      https://www.shopjimmy.com/samsung-bn...repair-kit.htm
                                      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

                                      • R_J
                                        Badcaps Legend
                                        • Jun 2012
                                        • 9534
                                        • Canada

                                        #20
                                        Re: Samsung LN46D630 no picture

                                        In post #1 you said :
                                        Audio but no picture, if I disconnect the inverter board the LCDs come on for half a second.
                                        Can you explain? when you say the LCD comes on for half second, do you mean the backlights come on for half second?
                                        if that is true, disconnecting the inverter will NOT give you any backlights at all. Or did you dissconect the MAIN board from the power supply, and that gave you half second of backlight
                                        Last edited by R_J; 06-15-2019, 06:25 PM.

                                        Comment

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