Identify component on LCD inverter board

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  • rawdr
    New Member
    • Jun 2012
    • 5
    • USA

    #1

    Identify component on LCD inverter board

    Hi. I've located the damaged component on an LCD panel used in an industrial EDM wire machine. Need help identifying a viable replacement.

    The monitor: NEC NL6448AC30-10
    Inverter board part: NEC HBL015

    The chip itself looks like a DPAK type transistor and has "KI472 4H" on it... unless that I is actually a 1? Does anyone know how to track down this component, or know enough about lcd inverter circuitry to suggest a general replacement?

    This component is on the opposite side of the board from the two inductors and two capacitors, as you'll see in the picture. The damage is showing through, so I may end up replacing these components as well.

    Thanks for the help.

    -Dave
    Attached Files
  • jetadm123
    Badcaps Legend
    • Feb 2010
    • 2169

    #2
    Re: Identify component on LCD inverter board

    Possibly a 2SK1472 N-channel mosfet used in high speed switching applications.

    Comment

    • R_J
      Badcaps Legend
      • Jun 2012
      • 9514
      • Canada

      #3
      Re: Identify component on LCD inverter board

      I agree,
      Part number 2SK1472
      Category Discrete => Transistors => FETs (Field Effect Transistors) => MOSFETs
      Description N-channel MOS Silicon Fet, Very High-speed Switching Application
      Company Sanyo Semiconductor Corporation

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Identify component on LCD inverter board

        F1 fuse (with 50 on top) is OK?
        Can I see the pictures of the whole board, both sides? That MOSFET looks like it is used for PWM for variable B+ feeding the the MOSFETs that drive the Royer Oscillator circuit.
        Last edited by budm; 08-12-2013, 09:21 PM.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • spidey
          climbs
          • Dec 2012
          • 648
          • Cyprus

          #5
          Re: Identify component on LCD inverter board

          just replace that inverter with a universal one.

          Comment

          • rawdr
            New Member
            • Jun 2012
            • 5
            • USA

            #6
            Re: Identify component on LCD inverter board

            Thanks for the quick responses, guys. I uploaded more complete pictures... yes F1 is still passing current.

            Any tips on the important characteristics to match for a more modern replacement? 2SK1472 doesn't seem widely available - I'd rather get a newer equivalent.

            Thanks again.
            Attached Files

            Comment

            • jetadm123
              Badcaps Legend
              • Feb 2010
              • 2169

              #7
              Re: Identify component on LCD inverter board

              ON Semiconductor shows a NTD3055-094 as a possible sub.

              Comment

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