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Sharp LCD LC-70LE660U

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    #1

    Sharp LCD LC-70LE660U

    Powers up back lights flash, I replaced the Tcon Board
    First power up worked great turned it off then back on no picture again.
    Unplug and reset ribbon cables powers up and works fine, Power down and
    back on nothing.

    Any idea where to start on this?
    Tags: None
    #2
    Re: Sharp LCD LC-70LE660U

    Need good clear straight on pictures of back of tv with cover off and each board.
    I assume no responsibility for any stupid suggestions I might post.

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      #3
      Re: Sharp LCD LC-70LE660U

      Here they are, Thank you for the assist!
      Attached Files

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        #4
        Re: Sharp LCD LC-70LE660U

        No picture as in no backlights. No image on screen
        I assume no responsibility for any stupid suggestions I might post.

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          #5
          Re: Sharp LCD LC-70LE660U

          The back lights flash then go off with no image on the screen.
          But if I disconnect and reconnect the Tcon board the back lights come on and I get picture
          As soon as I power it down and back on the back lights flash and no image

          Comment

            #6
            Re: Sharp LCD LC-70LE660U

            Not clear on what cables you are referring to on t con are they screen or main board ?

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              #7
              Re: Sharp LCD LC-70LE660U

              The 2 flat ribbon cables that goto what I'm guessing is the led drivers

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                #8
                Re: Sharp LCD LC-70LE660U

                As far as I know those ribbons just build the picture. If so your actions must be acting as a switch to affect something else. Have you tried disconnecting main board lead to t con to see what that does to backlights. I understand LED turn on voltage has to reach a certain figure then drop back a bit - guys is this correct?. These circuits today can affect one another. Check voltage going to t con usually about 12v. What happens to that voltage when ribbons disconnected I.e. load reduced. Hopefully the people with real knowledge will comment.

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                  #9
                  Re: Sharp LCD LC-70LE660U

                  on the connector that goes to your main board, can you take some measurements.
                  list it as

                  pin no, pin desc, v in stby, v when powered on, v when it faults




                  also v on the t-con fuse when running and when in fault mode as max has requested.
                  WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                  Comment

                    #10
                    Re: Sharp LCD LC-70LE660U

                    https://www.youtube.com/watch?v=MVGt7pV1-_E

                    http://www.avsforum.com/forum/166-lc...-thread-2.html

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