/Sharp Aquos LC-37D43U - backlight failed?

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  • FerndaleTech
    New Member
    • Jul 2014
    • 6
    • USA
    #1

    /Sharp Aquos LC-37D43U - backlight failed?

    Hi all, thanks for the help in advance!
    I have read and used info from the forum to solve problems with a few TV's over the years, this is my first time posting a question.

    I have this Sharp Aquos LC-37D43U that will not show a picture. I have read the other aquos forum posts witht he same model line, LC-xxD43U and they all seem to have a different issue i think.

    SYMPTOMS: When the main is attached the green power led lights up and you can turn on the tv with its power button, the white sharp logo will light up like it is supposed to, the screen lights up and shows a picture of whatever input you are sending it for approximately 1 second, then the backlight shuts down and the screen seems black.

    DIAGNOSTICS: removed the case and inspected the boards, I cannot find any obvious bad components. Using a multimeter I can find 5v standby, but I am having trouble finding a spot to check the 24v to the inverter boards.

    Pics of all boards attached.

    I'm hoping you can point me in the right direction as to where the bad board is. I can find several replacements available on ebay, and I have everything I need to replace a cap if I can find out which piece is bad.
    Thanks Again!
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: /Sharp Aquos LC-37D43U - backlight failed?

      "Pics of all boards attached." ?
      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

        • steviewonder
          Senior Member
          • Dec 2013
          • 183
          • england
          #3
          Re: /Sharp Aquos LC-37D43U - backlight failed?

          Probably a faulty transformer on the inverter boardQuite common.

            Comment

            • vinceroger69
              Badcaps Legend
              • Mar 2012
              • 6714
              • uk
              #4
              Re: /Sharp Aquos LC-37D43U - backlight failed?

              As budm says no pictures are attached?

                Comment

                • FerndaleTech
                  New Member
                  • Jul 2014
                  • 6
                  • USA
                  #5
                  Re: /Sharp Aquos LC-37D43U - backlight failed?

                  Dont know why the pics did not upload, maybe it will go thru this time...

                  oh, Im getting an error message from the server:


                  ERROR 500 - Internal Server Error!

                  The following error occurred:

                  The requested URL caused an internal server error.

                  If you get this message repeatedly please contact the webmaster.




                    Comment

                    • FerndaleTech
                      New Member
                      • Jul 2014
                      • 6
                      • USA
                      #6
                      Re: /Sharp Aquos LC-37D43U - backlight failed?

                      LINK to Dropbox album for pics of boards

                      https://www.dropbox.com/sc/k3m57iijv...zyBpwXYHGHfHPa


                      Thanks for all the fast replies!!

                        Comment

                        • FerndaleTech
                          New Member
                          • Jul 2014
                          • 6
                          • USA
                          #7
                          Re: /Sharp Aquos LC-37D43U - backlight failed?

                          According to what you guys have helped me figure out, one of the inverter transormers is bad. I am having trouble testing them because I can't find a diagram of their connectors to the board. Does anyone have or can anyone point me to a schematic or diagram for the NMB0001 inverter transformer for sharp aquos LC-37d43u from boards RUNTKA216WJZZ, or a diagram of the board or tv?

                            Comment

                            • vinceroger69
                              Badcaps Legend
                              • Mar 2012
                              • 6714
                              • uk
                              #8
                              Re: /Sharp Aquos LC-37D43U - backlight failed?

                              This is the nearest i can find after a quick search it may be good enough for a quick test etc http://www.lcdparts.net/TransformerD...ProductID=2802

                                Comment

                                • ammarben
                                  Senior Member
                                  • May 2013
                                  • 63
                                  • algeria
                                  #9
                                  Re: /Sharp Aquos LC-37D43U - backlight failed?

                                  http://preher-tech.com/documents/tes...ormersinlcdtvs

                                    Comment

                                    • FerndaleTech
                                      New Member
                                      • Jul 2014
                                      • 6
                                      • USA
                                      #10
                                      Re: /Sharp Aquos LC-37D43U - backlight failed?

                                      Thank you!!
                                      Will post results once I test them.

                                        Comment

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