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insignia has audio but no sound

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    #1

    insignia has audio but no sound

    I have a insignia ns-39d400na14. I turn it on and there is only audio but no video. The back light comes on. If you push the menu,volume, and channel button nothing shows up on the screen. But it will change the channel and the volume will change. I guess at this point I'm not sure how to diagnose it any further. I attached a couple pictures if you need more let me know.
    Attached Files
    Last edited by shadetreetrader11; 01-23-2016, 04:06 PM.
    Tags: None
    #2
    Re: insignia has audio but no sound

    so you have audio, but no video? Check the T-Con board

    Comment

      #3
      Re: insignia has audio but no sound

      Is the t-con board part of the main board ? Maybe I should have taken some better pics
      Last edited by shadetreetrader11; 01-23-2016, 05:48 PM.

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        #4
        Re: insignia has audio but no sound

        no. It is underneath that metal shield bottom middle. follow that cable from the main board.

        Comment

          #5
          Re: insignia has audio but no sound

          Ok how in the world is a guy supposed to change out this board with all the ribbon cables intertwined everywhere? Or am I making a bigger deal out of it than it really is? Here is more pics
          Attached Files

          Comment

            #6
            Re: insignia has audio but no sound

            It is integrated T-CON to the panel, not replaceable. Do you see that very small green fuse F1 with 'O'? printed on top right next to the big black diode on the left of the connector? Check to see what DCV you have at both ends with ref to the chassis GND.
            https://www.badcaps.net/forum/attach...7&d=1453610978
            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

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              #7
              Re: insignia has audio but no sound

              Fuse is good. 12v on each side of fuse

              Comment

                #8
                Re: insignia has audio but no sound

                well... that thing is screwed. Only thing you could do now is to check the LVDS cable with the oscilloscope, while turning on and off the menu all the time. You should find the video signal and see if it changes. Then you know for sure the main board is good.

                Comment

                  #9
                  Re: insignia has audio but no sound

                  Yes sir. It had a video sig. So I guess I'll give up on this one and move on to the next. Wanted to comment on the new site. Very nice. Thanks for the help guys.

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