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Sony Bravia KDL26L5000 no power

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    #1

    Sony Bravia KDL26L5000 no power

    sony bravia will not power up, when i plug it in i hear a relay click but no light on the front and pressing the power button has no effect. Checked for any bulging caps none are obvious.
    I have attached some photos for you guys to look at any help would be greatly appreciated.
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    #2
    Re: Sony Bravia KDL26L5000 no power

    You can start by checking the DC voltages on the connectors and comparing them to the legend.
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      #3
      Re: Sony Bravia KDL26L5000 no power

      checking the voltages on cn6201 starting at the top
      reg 12v blk brwn red i get 12vdc
      then on the orange yellow green blue purple 0 vdc (This can't be good)
      grey ,white 16.5vdc
      blk labeled stby 3.3vdc
      brown ac-det 2.86vdc
      red p on 2.72vdc

      on the cn6202 connector i get 24.8vdc.

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        #4
        Re: Sony Bravia KDL26L5000 no power

        Originally posted by fonthillhdtv View Post
        checking the voltages on cn6201 starting at the top
        reg 12v blk brwn red i get 12vdc
        then on the orange yellow green blue purple 0 vdc (This can't be good)
        grey ,white 16.5vdc
        blk labeled stby 3.3vdc
        brown ac-det 2.86vdc
        red p on 2.72vdc

        on the cn6202 connector i get 24.8vdc.
        i hope these are the values you were looking for

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          #5
          Re: Sony Bravia KDL26L5000 no power

          If the rainbow wires are ground then they'll be zero. What does the main board look like?

          Comment

            #6
            Re: Sony Bravia KDL26L5000 no power

            Originally posted by fonthillhdtv View Post
            checking the voltages on cn6201 starting at the top
            reg 12v blk brwn red i get 12vdc
            then on the orange yellow green blue purple 0 vdc (This can't be good)
            grey ,white 16.5vdc
            blk labeled stby 3.3vdc
            brown ac-det 2.86vdc
            red p on 2.72vdc

            on the cn6202 connector i get 24.8vdc.
            All those voltages above look like they match the legend including the 0V for GND.

            The only one I'm not 100% sure about is the ac-det pin. Tom66 is the expert on how it works there.
            Last edited by retiredcaps; 09-10-2012, 12:01 PM.
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            We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

            Please do not post inline and offsite as they slow down the loading of pages.

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              #7
              Re: Sony Bravia KDL26L5000 no power

              AC-DET lets the motherboard know that the TV's plugged in and the power isn't going to cut out any time soon. It looks good to me.
              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

                #8
                Re: Sony Bravia KDL26L5000 no power

                Originally posted by tom66 View Post
                AC-DET lets the motherboard know that the TV's plugged in and the power isn't going to cut out any time soon. It looks good to me.
                Bookmarked!
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                If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                Please do not post inline and offsite as they slow down the loading of pages.

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                  #9
                  Re: Sony Bravia KDL26L5000 no power

                  BTW, the only TV I've ever definitively seen an AC detect failure on is the LG 42PC1D plasma. It seems to be related to a bad series of "KA431" chips - the same as a TL431, basically a voltage detector. The fix of disabling it isn't ideal, but it is a simple way to fix it, and the LG TVs work fine with it - it only appears to affect things such as the audio "clicking" when the set turns off.

                  On some TVs, the AC detect is 50, 60, 100 or 120 Hz square wave signal with a 5V level, so will appear to be about 2.5V. On others, it is a simple HIGH signal, and going LOW indicates a problem.
                  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.

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                    #10
                    Re: Sony Bravia KDL26L5000 no power

                    from your responses then i gather the power board is functioning properly but alas the tv still will not turn on . any suggestions where to look next
                    Thanks for the help

                    Comment

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