Samsung LED TV UE40C5100QWXXU fuses blown

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  • dynomo
    New Member
    • Oct 2012
    • 6
    • uk

    #1

    Samsung LED TV UE40C5100QWXXU fuses blown

    Samsung UE40C5100QWXXU led tv. PSU BN44-00353A.

    Both fuses on the mains input open circuit. T6.3AH ceramic fuses. No shorts found in circuit at all? Rectifier tested fine. Any idea's?
  • ben7
    Capaholic
    • Jan 2011
    • 4059
    • USA

    #2
    Re: Samsung LED TV UE40C5100QWXXU fuses blown

    Could be a secondary side short, although mostly that will cause the switching transistors to explode.

    The switching transistors could be open circuit too. Not only the switching transistors could be broken though! The current sense resistor(s), diodes, even transformer windings!

    Pictures?
    Muh-soggy-knee

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: Samsung LED TV UE40C5100QWXXU fuses blown

      A secondary short will not cause a primary failure on a well designed PSU.

      The switching transistor, PFC transistor, or the controller ICs could be at fault here.
      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

      • ben7
        Capaholic
        • Jan 2011
        • 4059
        • USA

        #4
        Re: Samsung LED TV UE40C5100QWXXU fuses blown

        Originally posted by tom66
        A secondary short will not cause a primary failure on a well designed PSU.

        The switching transistor, PFC transistor, or the controller ICs could be at fault here.
        Ok, correction accepted
        Muh-soggy-knee

        Comment

        • dynomo
          New Member
          • Oct 2012
          • 6
          • uk

          #5
          Re: Samsung LED TV UE40C5100QWXXU fuses blown

          I have found the problem. Found 8.5k ohms across bridge rectifier + - After some investigation found CP818 / 100pf at 1KV burnt on the side
          Last edited by dynomo; 02-04-2013, 02:15 PM.

          Comment

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