Samsung LN40C630 won't turn on

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  • gingerbreadman
    Member
    • Sep 2013
    • 36
    • United States

    #1

    Samsung LN40C630 won't turn on

    I have a Samsung LN40C630 LCD tv that won't turn on. I have replaced both the main board and the power supply.
    There is a red light on the front the goes off when I push the power button on the remote, but after that the tv is unresponsive.
    What should I do next?
  • freakaftr8
    Badcaps Legend
    • Oct 2012
    • 3743
    • USA

    #2
    Re: Samsung LN40C630 won't turn on

    Take a flashlight and look into the screen. See anything?
    Did I leave the soldering iron on?

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Samsung LN40C630 won't turn on

      Pictures of the board? Power supply board P/N BNXX-XXXXX?
      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

      • gingerbreadman
        Member
        • Sep 2013
        • 36
        • United States

        #4
        Re: Samsung LN40C630 won't turn on

        Thank you for your replies. I looked at the screen with a flashlight, I couldn't see anything.

        Attached is some pictures as requested. There is a picture of the part number also.
        Attached Files

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: Samsung LN40C630 won't turn on

          Schematic of power board


          Across two yellow 450V capacitors, check the voltage before & after power button pressed. Expect 160V~170V in standby, 380~400V run.

          Unplug T-con and check if set powers on.

          Do not rule out the chance of a dud main board. Very common on these sets.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

          • gingerbreadman
            Member
            • Sep 2013
            • 36
            • United States

            #6
            Re: Samsung LN40C630 won't turn on

            I checked the voltages on the 2 yellow capacitors. They were right at what you said they should be. I was checking some of the voltages going out of the power supply though. I only found 3.6 volts on some of the pins, not the 5v, 12v or 13v it specifies.

            Unplugging the T-con board didn't seem to do much. But one of the times the red led light wouldn't go off when I pushed the power button on the remote (meaning I don't think the set powered up) and unplugging the T-con seemed to help that. But then after that with it still plugged in it powered up. The buttons on the tv don't seem to work, the only thing that works is the remote.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: Samsung LN40C630 won't turn on

              What you are saying is you did get it to rise from 160V to about 390V±15V when you press the power button?
              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

              Comment

              • gingerbreadman
                Member
                • Sep 2013
                • 36
                • United States

                #8
                Re: Samsung LN40C630 won't turn on

                The voltages went from 160v to 387v when turned on.

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: Samsung LN40C630 won't turn on

                  OK, and the 13V doesn't appear?
                  That is unexpected, because the one transformer generates all the power rails, all the power board does is switch them on using QM851,852.
                  Last edited by tom66; 10-10-2013, 04:57 PM.
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                  Comment

                  • gingerbreadman
                    Member
                    • Sep 2013
                    • 36
                    • United States

                    #10
                    Re: Samsung LN40C630 won't turn on

                    I just rechecked it. On the pins that are supposed to be 13v it only reads about 3.6v.

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: Samsung LN40C630 won't turn on

                      Can you see diode DM852 on the heatsink near the 13V, 5.3V, etc. output connector? Test the voltage on both ends with red probe, and black probe on chassis.
                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                      Comment

                      • gingerbreadman
                        Member
                        • Sep 2013
                        • 36
                        • United States

                        #12
                        Re: Samsung LN40C630 won't turn on

                        I attached a photo with a red circle around the one I think you're talking about.
                        If that's the one I can't see how to reach it with my test probe.
                        Attached Files

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #13
                          Re: Samsung LN40C630 won't turn on

                          You're right. Looks difficult. You might have to solder a lead to that pin to measure it while the board is attached to the chassis.
                          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                          Comment

                          • gingerbreadman
                            Member
                            • Sep 2013
                            • 36
                            • United States

                            #14
                            Re: Samsung LN40C630 won't turn on

                            Do you mean to solder a lead to the under side of the board and then re-install the power supply to test it?

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #15
                              Re: Samsung LN40C630 won't turn on

                              Yes, probably best to do both leads at once so you can test both.
                              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                              Comment

                              • gingerbreadman
                                Member
                                • Sep 2013
                                • 36
                                • United States

                                #16
                                Re: Samsung LN40C630 won't turn on

                                I removed the board to solder the leads on it and found out that both DM852 and DM853 were pushed through the board and the circuit board was broken around them. So I guess I'll be looking for another power supply.

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #17
                                  Re: Samsung LN40C630 won't turn on

                                  Not necessarily. Such damage is often repairable. If you show us a picture, we may be able to judge if that is the case.
                                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                  Comment

                                  • gingerbreadman
                                    Member
                                    • Sep 2013
                                    • 36
                                    • United States

                                    #18
                                    Re: Samsung LN40C630 won't turn on

                                    Okay, here is a couple pictures of the damage. Let me know if you need different pictures.
                                    Thank you for all your help so far. I appreciate it.
                                    Attached Files

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: Samsung LN40C630 won't turn on

                                      Looks quite fixable.

                                      First of all identify why that occurred, the only reason it could have occurred is the heatsink was pushed down, but this is not normally possible due to solder tabs. Check they are all soldered in place and that none have slipped or broken.

                                      Then, solder wire links to the respective copper areas. To get a good place to solder you will need to remove the solder mask from the board. This is what gives the board its green colour. A small blade or flatheaded screwdriver works well. Just scrape lightly on the appropriate area and you will reveal the inner copper. Once you have a bit of copper exposed, solder as indicated in the diagram.

                                      Blue areas: expose the copper
                                      Red areas: solder a wire
                                      Attached Files
                                      Last edited by tom66; 10-11-2013, 06:20 PM.
                                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                      Comment

                                      • gingerbreadman
                                        Member
                                        • Sep 2013
                                        • 36
                                        • United States

                                        #20
                                        Re: Samsung LN40C630 won't turn on

                                        I soldered those wires on. The tv powered on and seems to work great! Thank you so much for your help Tom66!
                                        Attached Files

                                        Comment

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