LG 50PK350N does not startup

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  • PowerAmpFreak
    Badcaps Veteran
    • Feb 2010
    • 977
    • Sweden

    #1

    LG 50PK350N does not startup

    Hello!
    I'm investigating a LG 50PK350N which does not startup. Voltages from PSU seems OK, both lowvoltage and VS and VA.
    It does not even give a brief flash of picture (as when the PSU resistors are bad)

    Brief measurements on Y-SUS does not reveal any failures. What next?
    Could this dude be put on testmode from Logic?
  • tw2005
    Badcaps Legend
    • Oct 2011
    • 6458
    • Australia

    #2
    Re: LG 50PK350N does not startup

    probably check out the buffers and see if shorted. It may be possible to fully isolate each buffer and see if you get half a screen. On the 50PK550 I did once I could. Funny thing the bottom buffer was shorted out by a cockroach.

    https://www.badcaps.net/forum/showthread.php?t=21677
    Attached Files

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    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: LG 50PK350N does not startup

      Check fuse for Vs/Va tract of power board.. I have a LG 42PQ3000 with same fault.
      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

      • PowerAmpFreak
        Badcaps Veteran
        • Feb 2010
        • 977
        • Sweden

        #4
        Re: LG 50PK350N does not startup

        All voltages are within spec from PSU. All fuses OK on PSU. All fuses OK on Y-SUS and X-MAIN.
        BUT, the led "D1" on logic board does not light or flash.
        Power seems to enter logic board, IC's get warm.
        Still, could it be put in testmode?

        Comment

        • PowerAmpFreak
          Badcaps Veteran
          • Feb 2010
          • 977
          • Sweden

          #5
          Re: LG 50PK350N does not startup

          Howdy boys!
          Is there any pattern generating testmode available in these sets, like shorting a jumper?

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: LG 50PK350N does not startup

            Yes, jumper pins EXT AUTO GEN on CTRL board with LVDS cable removed.
            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

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