smd code 431

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  • chetreynolds
    chet
    • Aug 2010
    • 77

    #1

    smd code 431

    I have a model dps-475ap power supply from a vizio tv > It has several smd sot 23 devices marked 431h my code book lists it as a zener diode . But my compenent tester indicates that it is an npn transistor with non typical pin out outs ebc base the top single pin . It is also marked as ic... on the board other transistors are labelet q... and diodes are labeled d...
    Any sugestions on how to identify this device?
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: smd code 431

    Probably a TL431? Voltage reference, adjustable zener diode.
    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

    • chetreynolds
      chet
      • Aug 2010
      • 77

      #3
      Re: smd code 431

      Not likely the board has at least 10 of the devices and it is to small for any power smd sot23 package . Thanks for the response

      Comment

      • tw2005
        Badcaps Legend
        • Oct 2011
        • 6458
        • Australia

        #4
        Re: smd code 431

        Originally posted by chetreynolds
        Not likely the board has at least 10 of the devices and it is to small for any power smd sot23 package . Thanks for the response
        Really

        I found the following from a DPS-250 drawing.

        APL431HAAI-TRL (ANPEC)
        TLV431ASN1T1G (on-semi)

        Available as SOT-23, SOT-23-5, SOT-89, SO-8, TO-92, TO-92S etc
        Attached Files
        Last edited by tw2005; 03-07-2014, 10:42 PM.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: smd code 431

          What is the TV not doing?
          Is this the model you have?
          http://s807.photobucket.com/user/bud...?sort=3&page=1

          http://www.shopjimmy.com/vizio-0500-...upply-unit.htm
          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

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