Samsung PS42A457P1DA No picture just sound

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  • noledud
    Badcaps Veteran
    • Dec 2013
    • 413
    • united kingdom
    #1

    Samsung PS42A457P1DA No picture just sound

    Hi All

    Just wanted to confirm my diag of this set

    When powered up all comes on hear startup sound however no picture not even a glow

    VS / va votages correct with sticker on PS y ma ininput and xmain input

    No Test pattern when cntrl board jumped again just blank screen

    Checked y main

    VSCH jumps from 25.5 to 28 volts ( not stable jumpin up and down)

    VSCAN is -46v for a min then rises to -158 ( not stable jumpin up and down)

    No shorts on buffers or y / x main

    Correct me if im wrong but this tells me y main is bad my question is could it just be a cap charging problem ? - (all look ok to the eye )

    or could a bad panel cause the voltages to do that ?
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    • noledud
      Badcaps Veteran
      • Dec 2013
      • 413
      • united kingdom
      #2
      Re: Samsung PS42A457P1DA No picture just sound

      just tried it with panel disconnected from buffers and the voltages on the ymain VSCH / VSCAN still all over the show

        Comment

        • noledud
          Badcaps Veteran
          • Dec 2013
          • 413
          • united kingdom
          #3
          Re: Samsung PS42A457P1DA No picture just sound

          anyone ?

            Comment

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