Samsung LE32B455 intermittent loss of power

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  • PowerAmpFreak
    Badcaps Veteran
    • Feb 2010
    • 977
    • Sweden

    #1

    Samsung LE32B455 intermittent loss of power

    Hello all,
    According to owner, it would sometimes appear all dead. Not even the standby light is on. Can't get the fault to show up, and a check of standby supply didn't give any clues.
    Is there any known issues with this supply?
    All caps looks good,
  • PowerAmpFreak
    Badcaps Veteran
    • Feb 2010
    • 977
    • Sweden

    #2
    Re: Samsung LE32B455 intermittent loss of power

    Check the attached picture if your memory can come up with something
    I touched up the soldering on power components, replaced the secondary caps just to be sure they're ok. But this SMPS has worked every time for me, but the customer is sure it won't.
    Over time it was harder and harder to start it up (like typical cap problem).
    Attached Files

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: Samsung LE32B455 intermittent loss of power

      Replace the startup cap if encounters further issues.
      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

      • mtoivanen
        New Member
        • Sep 2014
        • 9
        • Finland

        #4
        Re: Samsung LE32B455 intermittent loss of power

        Hi! I have same TV, with same problem. It's totally dead, standby line shows up 0.2V. Any clue what could be broken, both of fuses are good? PSU model is BN44-00261B.

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8130
          • Canada

          #5
          Re: Samsung LE32B455 intermittent loss of power

          Check if you have power on the primary filter cap

          Comment

          • mtoivanen
            New Member
            • Sep 2014
            • 9
            • Finland

            #6
            Re: Samsung LE32B455 intermittent loss of power

            Originally posted by CapLeaker
            Check if you have power on the primary filter cap
            Checked, there is power going to primary filter cap But nothing is coming out from PSU

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 8130
              • Canada

              #7
              Re: Samsung LE32B455 intermittent loss of power

              O.k. you have power to the big 400V filter cap, that's good. Now look if you are getting 5V on the 5V rail. The 5V should be always on, with the TV on or off. If there is nothing there, check the diode and caps right after the transformer (see schematic, p1 top right).
              Attached Files

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Samsung LE32B455 intermittent loss of power

                Also check voltage across Vcc cap for PSU controller.
                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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