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    Sony Bravia 40" - No Picture, Sound Works

    Hi All,

    I'm having a problem with a 2 year old Sony Bravia, 40" LCD TV. I read through all the boards, and did a bunch of testing, so here's a recap to make this as easy as possible:

    - MODEL: Bravia KDL-40EX523
    - ISSUE: One day, the TV just had no picture. It came out of nowhere. I tried plugging it in, resetting it, etc. But nothing works to bring the picture back. I have sound, but no picture. I can tune channels, hear them, but can't see a menu, or anything. The backlight works great.

    Troubleshooting so far:
    - I took apart the TV and checked for any bad caps, blown fuses, etc. anything obvious or burnt, nothing.
    - I took a multimeter to a few fuses on the power supply board, and everything looks good.
    - I checked the fuse on the T Con board, it is in good shape. Checked it with a multimeter, works good (~ 0 resistance, isn't burnt). (This is usually the 'F1' fuse. For me it was rated at 3A, 125V)
    - When I turn the TV on, there is a slight clicking... but I can't identify a source.

    TV repair guy said it's the main board; I read all similar threads on here; it seems like it's the T Con board.

    How should I proceed in troubleshooting it? Would it be best to bite the bullet, and buy a new T Con board, and test that? Or should I get a new main board (it's called a BAT V board AFAIK?)? Or am I overlooking something before continuing.

    Any help would be greatly appreciated. Thank you!

    #2
    Re: Sony Bravia 40" - No Picture, Sound Works

    Can you see the backlights on?
    Post Pictures of all the boards.
    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


      #3
      Re: Sony Bravia 40" - No Picture, Sound Works

      Yes, I can see the backlight on.

      I took a bunch of pictures of the boards. The photos include: the inverter board, an overall view of the whole back of the TV, the t con board, and two pictures of the main board.
      Attached Files

      Comment


        #4
        Re: Sony Bravia 40" - No Picture, Sound Works

        Have you checked the fuse on the tcon? I see a few fuses on your main boards pictures too.

        Comment


          #5
          Re: Sony Bravia 40" - No Picture, Sound Works

          Checked the fuse on the tcon, getting a reading of about 0.2 ohm with a multimeter. I checked the fuses on the main board, and I'm getting approximately the same readings too.

          Comment


            #6
            Re: Sony Bravia 40" - No Picture, Sound Works

            Check the voltage on each end of the T-con fuse, with the red lead on either end, and black lead on the chassis, and the TV in the powered on state.
            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


              #7
              Re: Sony Bravia 40" - No Picture, Sound Works

              Getting 12.54V

              Comment


                #8
                Re: Sony Bravia 40" - No Picture, Sound Works

                OK, that is good. I would suspect the T-con, but it could still be the main board.
                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


                  #9
                  Re: Sony Bravia 40" - No Picture, Sound Works

                  Which should I go about replacing first?

                  Comment


                    #10
                    Re: Sony Bravia 40" - No Picture, Sound Works

                    The T-con is usually the cheapest and easiest to replace.

                    Unless you have an oscilloscope, it's difficult to tell which board is causing no picture. The T-con tends to fail more often. The T-con is made by Samsung usually (as part of the LCD assembly Sony buys in to make the TV), and it carries with it Samsung reliability, which is not very good.
                    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


                      #11
                      Re: Sony Bravia 40" - No Picture, Sound Works

                      Oh, and there are a few things you can test on the T-con before you just swap it out, so if you want to do that it may end up cheaper or confirm the T-con is at fault.
                      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


                        #12
                        Re: Sony Bravia 40" - No Picture, Sound Works

                        Shop Jimmy has the tcon for $50 and the main board is on ebay for $54. Both parts will need a firmware update after installation.

                        Comment


                          #13
                          Re: Sony Bravia 40" - No Picture, Sound Works

                          Bill are you sure about the T-con needing a firmware update? Do they even have firmware?
                          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


                            #14
                            Re: Sony Bravia 40" - No Picture, Sound Works

                            that's what shop jimmys site is telling me. Here is the link.
                            http://www.shopjimmy.com/samsung-lj9...-con-board.htm

                            Comment


                              #15
                              Re: Sony Bravia 40" - No Picture, Sound Works

                              Ah, that may apply to the main board. Odd.
                              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

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