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Sony KD-65XD9305 - DPS fault

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    #1

    Sony KD-65XD9305 - DPS fault

    Hi,

    I'm due to remove a faulty DPS board for this TV today. I know they are a common fault in various Sony sets. I'm just wondering what actually goes faulty on these boards?

    I've read it's a certain IC, although I don't know which one it could be and that the fix is a different version of this chip.

    Any pointers?

    Many Thanks,

    Matt
    Tags: None
    #2
    Re: Sony KD-65XD9305 - DPS fault

    Do you know for sure it's the DPS board ? https://www.sony.co.uk/electronics/s...icles/00180172

    Comment

      #3
      Re: Sony KD-65XD9305 - DPS fault

      Not yet, but I know it's very common for a dead set.

      I've seen the free repair, but i've been asked to repair rather than get Sony involved - not sure the free repair works with second-hand units either.

      Comment

        #4
        Re: Sony KD-65XD9305 - DPS fault

        This might help ..

        but i think the chip is TPS54334DDA goes on these and a fuse..
        IC408 and an smd fuse, F404 fitted to the DPS board.
        These were the parts being sold for a repair kit.

        I tried it on a set but it did not work for me.
        and did not have time to investigate further
        maybe it will be better for you

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          #5
          Re: Sony KD-65XD9305 - DPS fault

          this may help too

          https://www.berlin-repariert.de/sony...eine-funktion/

          use translate read

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            #6
            Re: Sony KD-65XD9305 - DPS fault

            Originally posted by zomi View Post
            this may help too

            https://www.berlin-repariert.de/sony...eine-funktion/

            use translate read
            Many Thanks Zomi, that's excellent information.

            Much obliged

            Comment

              #7
              Re: Sony KD-65XD9305 - DPS fault

              No problem
              please update the thread to let us know how u get on

              thanks

              Comment

                #8
                Re: Sony KD-65XD9305 - DPS fault

                Quick update,

                Tested the DPS in-situ, 24volts present on both sides of Fuse F404. No output from the TPS54334. SW Output resistance to ground is 8 Ohms.

                Removed IC from the board, 8 Ohm resistance present between SW output and GND. Ordered replacement IC.

                Found another DPS board on eBay listed as new and appears to have a resistor mod. See attached photo. My guess is it's either a 12K or 82K Ohm resistor to strap the PGOOD pin on the TPS54334 to GND - A strange mod as the Datasheet suggests this pin should be pulled up to VDD (max 6v) using a 100K Ohm resistor. Would be interested to know how this mod works? On original board the PGOOD pin seems to be floating?

                Cheers,

                Matt
                Attached Files

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                  #9
                  Re: Sony KD-65XD9305 - DPS fault

                  TV is now fixed!

                  Replaced TPS54334, tied PGOOD pin to Ground via 100k resistor instead of leaving it floating.

                  Cheers,

                  Matt

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