PS51D550C1KXXU, Samsung X-SUS rebuild

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  • zen
    Badcaps Veteran
    • Apr 2011
    • 511

    #1

    PS51D550C1KXXU, Samsung X-SUS rebuild

    Not expecting a schematic but would be helpful if available.

    PCB PART NO - LJ92-01763A

    PBA REVISION - AA4

    This board drives a full HD display.
    Attached Files
  • zen
    Badcaps Veteran
    • Apr 2011
    • 511

    #2
    Re: PS51D550C1KXXU, Samsung X-SUS rebuild

    First of many casualties, I'm sure.

    Q4101 & Q4104, BOTH TYPE 30G124

    D4103, TYPE SF10400H, replace as a precaution.
    Attached Files

    Comment

    • zen
      Badcaps Veteran
      • Apr 2011
      • 511

      #3
      Re: PS51D550C1KXXU, Samsung X-SUS rebuild

      Q4301 & Q4302, BOTH TYPE RJP30H1, S/C

      D4302, TYPE SF10A400H, replaced as a precaution.
      Attached Files

      Comment

      • zen
        Badcaps Veteran
        • Apr 2011
        • 511

        #4
        Re: PS51D550C1KXXU, Samsung X-SUS rebuild

        Q4202 & Q4503 (30G124) also faulty
        Attached Files

        Comment

        • zen
          Badcaps Veteran
          • Apr 2011
          • 511

          #5
          Re: PS51D550C1KXXU, Samsung X-SUS rebuild

          Replaced all the associated GATE drive chips for the blown FETS.

          U4301, U4201, U4411, U4412.All type FAN73711
          Attached Files

          Comment

          • zen
            Badcaps Veteran
            • Apr 2011
            • 511

            #6
            Re: PS51D550C1KXXU, Samsung X-SUS rebuild

            R4301, 15R

            Measured correct, although looked like it had cooked.
            Attached Files

            Comment

            • zen
              Badcaps Veteran
              • Apr 2011
              • 511

              #7
              Re: PS51D550C1KXXU, Samsung X-SUS rebuild

              After attending to many poor solder joints on X-SUS, Y-SUS & PSU, plus replacing thermal pads that had leaked out, I gradually applied power to TV using the variac.

              Set now starts up, with VS & VA supplies spot on.

              The VE according to screen label is high though, at 100V instead of 80V.

              Adjustment on X-SUS has absolutely no effect.

              Any ideas?
              Attached Files

              Comment

              • zen
                Badcaps Veteran
                • Apr 2011
                • 511

                #8
                Re: PS51D550C1KXXU, Samsung X-SUS rebuild

                Been working ok for days.

                Heatsinks on X-SUS, no warmer that Y-SUS.

                Kicking it out like this.

                Also noticed some sparkles at top end of display, especially on white screen.

                Guessed weakness of display over time, therefore increase VS volts by 3V which cleared sparkles.

                Comment

                • nomoresonys
                  Badcaps Legend
                  • Jan 2013
                  • 12081
                  • U.S.

                  #9
                  Re: PS51D550C1KXXU, Samsung X-SUS rebuild

                  that looked like an excellent job to me, you were careful and methodical and didn't rush it and blow anything up or have to redo anything.

                  Comment

                  • zen
                    Badcaps Veteran
                    • Apr 2011
                    • 511

                    #10
                    Re: PS51D550C1KXXU, Samsung X-SUS rebuild

                    Very kind of you to mention, thanks.

                    Comment

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