Royally blown caps

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  • Daize
    Dodgy Newbie
    • May 2013
    • 37
    • Australia

    #1

    Royally blown caps

    I stumbled upon a cheap Chinese "Konka" 37" LCD on my drive to work. No idea of it's condition and I believe it may have been there for a while (and rained on) , and has three blown caps on what I assume is the input side (not marked hot/cold) from the size and voltages of the caps. The power supply is made by a company called "speedy-tech". The fuses are fine, but not a drop of voltage is on the output header.

    What would cause this (apart from the CapXon brand) and is it reasonable to replace the caps or could this be a sign of potentially greater issues? I've never had big 450v caps blow before.

    Also, there are two separate CCFL inverters, one on each side. They are marked "LG. Phillips LCD Co ... YPNL-T010D" also one is "slave" the other is "master". They each only seem to have one wire going to the CCFL; the pink 'high'. What's the story there? Have they both been ripped out or are they meant to be like that (passing from one side to the other, perhaps?)?

    The blown caps are:
    2 x 10μf 450v
    2 x 100μf 450v (highest on shelf here is 400v, could I possibly use this? My supply is max 245vac)

    I can do higher-res photographs if desired.

    Thanks!
    Attached Files
    Last edited by Daize; 05-16-2013, 11:23 PM.
  • retiredcaps
    Badcaps Legend
    • Apr 2010
    • 9271

    #2
    Re: Royally blown caps

    Originally posted by Daize
    What would cause this (apart from the CapXon brand) and is it reasonable to replace the caps or could this be a sign of potentially greater issues? I've never had big 450v caps blow before.
    Capxon makes either the worst or second worst caps. They are terrible. Replace ALL your caps on the power board with quality brand name caps like Panasonic FR/FM/FC from digikey.com and you may have a working TV.

    In addition, check the bridge rectifier, power mosfet and diodes to for shorts on the power board.
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    Comment

    • Daize
      Dodgy Newbie
      • May 2013
      • 37
      • Australia

      #3
      Re: Royally blown caps

      Originally posted by retiredcaps
      Capxon makes either the worst or second worst caps. They are terrible. Replace ALL your caps on the power board with quality brand name caps like Panasonic FR/FM/FC from digikey.com and you may have a working TV.

      In addition, check the bridge rectifier, power mosfet and diodes to for shorts on the power board.
      Indeed, I have replaced plenty of CapXon caps.

      I don't know the history of this television and mainly don't know what the state of the LCD is so until then I don't really want to spend money on it. I've replaced all the visibly bad caps, but there's more problems.

      I made a proper thread as I realised this one wasn't really in the best place. My new thread's over here:
      https://www.badcaps.net/forum/showthread.php?p=338777

      Thanks for your help, by the way!

      Comment

      • japlytic
        Badcaps Legend
        • Oct 2005
        • 2086
        • Australia

        #4
        Re: Royally blown caps

        Originally posted by Daize
        The blown caps are:
        2 x 10μf 450v
        2 x 100μf 450v (highest on shelf here is 400v, could I possibly use this? My supply is max 245vac)
        This set is likely to have active power factor correction, so I recommend using 450V units.
        I recommend Chemi-Con KXG units (this series is rated at 100kHz) to replace these capacitors, and I also recommending replacing the other non-Japanese units on the power supply board with Chemi-Con KY, KZM or if you can get them, Chemi-Con KZN.
        Last edited by japlytic; 05-18-2013, 02:52 AM. Reason: Clarification
        My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

        Comment

        • cheapie
          null
          • Jul 2010
          • 849
          • USA

          #5
          Re: Royally blown caps

          Originally posted by japlytic
          I recommend Chemi-Con KXG units
          Just make sure you don't accidentally use KZG!

          Comment

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