Sharp LC-40LE812E fuses blown

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  • gozotto
    New Member
    • Aug 2018
    • 3
    • Germany

    #1

    Sharp LC-40LE812E fuses blown

    Hello,
    I repaired a Sharp LC-40LE812E TV with the main power board DPS-126CP B.
    All fuses blown and the capacitor C7813 (220pF 1KV) was cracked. After replacing both, the TV works again without any problems. After 2 weeks the same problem apears with the same symptoms. What can the C7813 blown again and again? The schematic can be found here.

    Thanks in Advance
    gozotto
  • Diah
    Badcaps Legend
    • Feb 2013
    • 6343
    • Germany

    #2
    Re: Sharp LC-40LE812E fuses blown

    with out looking to the manual-- if yours repair was on the primary section at PCB. then need complete circuit parts to replace at once..( Netzteil Set )

    Comment

    • gozotto
      New Member
      • Aug 2018
      • 3
      • Germany

      #3
      Re: Sharp LC-40LE812E fuses blown

      Did you mean the rectifier and the filter caps? I checked both and the filter caps have a low ESR.

      Comment

      • Diah
        Badcaps Legend
        • Feb 2013
        • 6343
        • Germany

        #4
        Re: Sharp LC-40LE812E fuses blown

        not rectifier .. upload clear photo to see C7813 in circuit

        Comment

        • dskall
          Badcaps Legend
          • Oct 2016
          • 2905
          • usa

          #5
          Re: Sharp LC-40LE812E fuses blown

          I would replace it with a 2k and check all components in pfc circuit. Also check voltage at cap.
          I assume no responsibility for any stupid suggestions I might post.

          Comment

          • gozotto
            New Member
            • Aug 2018
            • 3
            • Germany

            #6
            Re: Sharp LC-40LE812E fuses blown

            I replaced the C7813 with a 3kV one and now I hear some noise from board (transformer). Imeasured the voltage on the caps C7800A/B => 328V. I desolderd the MOSFET and checked it outside with the component tester. All good.
            The C7813 can only blown with a voltage to high? But why?

            Comment

            • dskall
              Badcaps Legend
              • Oct 2016
              • 2905
              • usa

              #7
              Re: Sharp LC-40LE812E fuses blown

              328v in standby? What is it when powered on?
              I assume no responsibility for any stupid suggestions I might post.

              Comment

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