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42PC3D No Prime

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    #1

    42PC3D No Prime

    I swore off these sets but here we are...

    Set wouldn't turn on until I disconnected the zsus. Powers on and stays on, can hear the static from the speakers on what must be Antenna input but there is no screen prime at all.

    I have VS, VA, Vsc but no -Vy. Have not removed the ysus to check components yet. Could shorted buffers pull down just -Vy ?

    Also the zsus has no blown fuses so why would it need to have the power harness disconnected for the tv to start ?

    And is it safe to run the panel with the x buffers disconnected ?
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    #2
    Re: 42PC3D No Prime

    At some point the zsus fulfilled its destiny as vs is now shorted to ground on it. I'm going to pull the ysus to see if I can find why -Vy is missing. Is -Vy generated straight from Vs on the little sub board ?

    I also took some measurements from the dc-dc converter and they don't look right. There are three what I thought were voltage regulators there but the measurements are off unless I'm doing it wrong. Are they not measured at pin 3 with respect to ground ?

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      #3
      Re: 42PC3D No Prime

      Should there be a blinking led on this control board ? I have three temp leds but there is another one at D11 (in a different board location) which never lights.

      Also -Vy is missing with buffers both connected and disconnected. If I remove the ribbon going to the control board it comes back rock solid at -200v.

      Does this sound like a control board issue ?

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        #4
        Re: 42PC3D No Prime

        Yes Led should blink common issue on these is the Ipm under Zmain failing.
        Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

        https://www.facebook.com/Telford-Tel...7894576335359/

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          #5
          Re: 42PC3D No Prime

          This happens with zsus removed. Thanks for the heads up on the blinking light, will order a control board.

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            #6
            Re: 42PC3D No Prime

            This one ended badly. The folding table it was on had a leg give out resulting in the screen cracking itself on the concrete floor. Off to plasma heaven lol.

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