Samsung ps42a457 showing bad image

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  • Liam.25
    Senior Member
    • Feb 2011
    • 107
    • Uk

    #1

    Samsung ps42a457 showing bad image

    First check
    Vs should be 205, it's at 150
    Va should be 54 it's at 41

    Unplug x main and y main

    All voltages are perfect out of psu

    If I plug either boards in, I get the above incorrect voltage

    Usually only 1 board has caused this

    Does it mean x and y main are both bad??
  • Liam.25
    Senior Member
    • Feb 2011
    • 107
    • Uk

    #2
    Re: Samsung ps42a457 showing bad image

    No x and y connected
    Vs205 va54

    Just with x
    Vs154 va43

    Just with y
    Vs146 va41

    With x and y
    Vs140 va39

    Comment

    • Liam.25
      Senior Member
      • Feb 2011
      • 107
      • Uk

      #3
      Re: Samsung ps42a457 showing bad image

      Anybody??

      Comment

      • freakaftr8
        Badcaps Legend
        • Oct 2012
        • 3743
        • USA

        #4
        Re: Samsung ps42a457 showing bad image

        I would look into power supply area. Somethings wrong in the high voltage output section. It has no problem outputtinng the supply but once put under a load it looses its ability to keep up. Look to capacitors being the prob. Any swollen or bulged?
        Did I leave the soldering iron on?

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: Samsung ps42a457 showing bad image

          Could be film cap on primary side going bad too.
          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

          • freakaftr8
            Badcaps Legend
            • Oct 2012
            • 3743
            • USA

            #6
            Re: Samsung ps42a457 showing bad image

            Originally posted by tom66
            Could be film cap on primary side going bad too.
            Agreed, I had a 42" AKAI plasma with a mylar film cap go bad.. Changed 6 of them.

            These are red or orange in color or green with 2 leads off the bottom.
            Did I leave the soldering iron on?

            Comment

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