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Insignia NS-LCD47HD-09 no picture

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    Insignia NS-LCD47HD-09 no picture

    I have come to a dead end on this and would like some help. Most of the repair I have done has been bad caps, so I don't know where to go with this one. When I check the voltages at the power board and at the main board they are all OK. I did the flashlight test and did not see an image. So I replaced the T-con board with a used one that I believe to be good and still no picture. Any help would be appreciated.
    Attached Files

    #2
    Re: Insignia NS-LCD47HD-09 no picture

    Do you get backlights ? Common issue with this chassis is the mobo not sending the Blon signal meaning backlights wont fire on.
    Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

    https://www.facebook.com/Telford-Tel...7894576335359/

    Comment


      #3
      Re: Insignia NS-LCD47HD-09 no picture

      The screen never lights up.

      Comment


        #4
        Re: Insignia NS-LCD47HD-09 no picture

        Ok do you have a DMM ? No point just throwing boards at it, you need to diagnose this properly.
        Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

        https://www.facebook.com/Telford-Tel...7894576335359/

        Comment


          #5
          Re: Insignia NS-LCD47HD-09 no picture

          I do have a digital multimeter. I assume that is DMM?

          Comment


            #6
            Re: Insignia NS-LCD47HD-09 no picture

            Since I am not getting back lights I did some checking on the board. It seems as if the fuse located at C55 in the attached picture. On one side I get 24 volts, on the other side 0. So what would have caused this fuse to blow?
            Attached Files

            Comment


              #7
              Re: Insignia NS-LCD47HD-09 no picture

              The test points at the end of the ribbon cable have no voltage. All of the white fuses on this board have 24v and are good. I did not find voltage at any black fuse.
              Attached Files
              Last edited by rod30; 02-09-2016, 06:55 PM.

              Comment


                #8
                Re: Insignia NS-LCD47HD-09 no picture

                You need to check the BL-ON signal on the inverter board, you need to remove that black cover so you can see if the pins of those two big white connectors are labeled or not.
                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: Insignia NS-LCD47HD-09 no picture

                  Thank you for the reply. Yes, voltages are as follows.....

                  VBL-24.4v VBL-24.4v
                  VBL-24.4v VBL-24.4v
                  VBL-24.4v VBL-24.4v
                  VBL-24.4v VBL-24.4v
                  VBL-24.4v VBL-24.4v
                  GND GND
                  GND GND
                  GND GND
                  GND GND
                  STATUS-not used
                  E_PWM-not used
                  I_PWM-3v
                  BLON-3v
                  Attached Files

                  Comment


                    #10
                    Re: Insignia NS-LCD47HD-09 no picture

                    OK, you do have all the needed signal for the inverter board to function, so I need to see good clear picture of the inverter board.
                    Thanks for the nice and clear picture in post 9.
                    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


                      #11
                      Re: Insignia NS-LCD47HD-09 no picture

                      BTW, that small black fuse with '20' printed on top shows < 1 Ohms of resistance?
                      https://www.badcaps.net/forum/attach...3&d=1455065642
                      Attached Files
                      Last edited by budm; 02-10-2016, 10:02 AM.
                      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


                        #12
                        Re: Insignia NS-LCD47HD-09 no picture

                        Originally posted by rod30 View Post
                        Since I am not getting back lights I did some checking on the board. It seems as if the fuse located at C55 in the attached picture. On one side I get 24 volts, on the other side 0. So what would have caused this fuse to blow?
                        Can you please point out to the fuse? What is printed on the fuse? I see C55 but I do not see any black fuse close by.
                        https://www.badcaps.net/forum/attach...1&d=1455064479
                        Attached Files
                        Last edited by budm; 02-10-2016, 10:04 AM.
                        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


                          #13
                          Re: Insignia NS-LCD47HD-09 no picture

                          "It seems as if the fuse located at C55 in the attached picture"
                          The label is a giveaway, not a fuse rather a ceramic capacitor
                          You can see the label for the fuse on the inverter board pic but not the fuse are those fuses good?
                          Last edited by Caleb; 02-10-2016, 10:06 AM.
                          Liberating magic smoke one part at a time

                          Comment


                            #14
                            Re: Insignia NS-LCD47HD-09 no picture

                            Originally posted by Caleb View Post
                            "It seems as if the fuse located at C55 in the attached picture"
                            The label is a giveaway, not a fuse rather a ceramic capacitor
                            Ah I see what he is saying now, he thinks C55 is a fuse. I also wonder what he means by this also in post 7: I did not find voltage at any black fuse.).
                            There is only one black fuse with '20' printed on top.
                            Last edited by budm; 02-10-2016, 10:09 AM.
                            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


                              #15
                              Re: Insignia NS-LCD47HD-09 no picture

                              I think he didn't test that fuse yet even though you circled it
                              Liberating magic smoke one part at a time

                              Comment


                                #16
                                Re: Insignia NS-LCD47HD-09 no picture

                                You are correct, some things I thought were fuses were not. I have tested both of the large white fuses located near the capacitors and have 24v on both sides. Also I have 24v at the + leg of each capacitor. I am somewhat new at this and will try to do better. Please don't give up on me.
                                Attached Files
                                Last edited by rod30; 02-10-2016, 01:54 PM.

                                Comment


                                  #17
                                  Re: Insignia NS-LCD47HD-09 no picture

                                  You need to test that small black fuse I show in the picture in post 11.
                                  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


                                    #18
                                    Re: Insignia NS-LCD47HD-09 no picture

                                    The black fuse with "20" on the top. Has 24v on the side toward the connector and 1.2 on the other side. Wow, that is small. I have never replaced anything that small. Please give me some idea where I get a fuse like that and how is the best way to replace it. Also, it blew for a reason. Have you had good results just replacing one and not being to concerned why it's blown?
                                    Last edited by rod30; 02-10-2016, 02:30 PM.

                                    Comment


                                      #19
                                      Re: Insignia NS-LCD47HD-09 no picture

                                      That black fuse is the common failure fuse used in CMO inverter board, I use PICOII through hole fuse in its place, done so many of them without having the TVs come back with the same blown fuse.
                                      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


                                        #20
                                        Re: Insignia NS-LCD47HD-09 no picture

                                        You can test (in ohms) from the side that gets no voltage to ground and reply back.

                                        Sometimes fuses fatigue over time and there is no fault just an open connection. If the ohm reading is in kohms you probably just have a failed fuse, if its in tens or hundreds of ohms you have a fault that blew the fuse.

                                        btw sorry budm you replied as I was typing : )
                                        Liberating magic smoke one part at a time

                                        Comment

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