PN50B430P2DXZA Sound Nothing Else Part Duex

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  • Michale32086
    New Member
    • Nov 2011
    • 1453
    • USA

    #1

    PN50B430P2DXZA Sound Nothing Else Part Duex

    Way way way back in Dec of 2014, I was working on a nice Sammy PN50...

    Being that I have learned a lot since then, I wanted to re-visit the unit and get confirmation on what I think is wrong..

    I am going to sum up the previous thread, but if anyone wants to refer back to it, it's here:

    https://www.badcaps.net/forum/showthread.php?t=42835

    What I have is a Samsung PN50B430P2DXZA. On plug-in/power-up, I get a relay click and I hear the Samsung startup tones..

    No picture on the display whatsoever...

    All voltages all check out per the label...

    The Control Board LED blinks the normal one-per-sec so it's not in protection mode.. But I replaced it anyways (got one cheep) but no luck..

    I get an audible power hum out of the X-Main board and a noticeable click-click-click-click (sounds like a BBQ Grill Igniter) from the Y-SUS board...

    Judging from the previous thread, my thinking is a bad Y-SUS board..

    Sound about right??
    Attached Files
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: PN50B430P2DXZA Sound Nothing Else Part Duex

    If you can find Vsc and Vsch on the Y-main check if those are steady. Maybe worth checking buffer ICs... do you have a meter that beeps?
    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

    • Michale32086
      New Member
      • Nov 2011
      • 1453
      • USA

      #3
      Re: PN50B430P2DXZA Sound Nothing Else Part Duex

      Yea, my meter beeps. I'll check Vsc and Vsch...

      Iffn ya don't hear from me in 10 mins, dial 911

      "If I'm not back in 5 minutes... Just wait longer"
      -Ace Ventura

      Comment

      • Michale32086
        New Member
        • Nov 2011
        • 1453
        • USA

        #4
        Re: PN50B430P2DXZA Sound Nothing Else Part Duex

        Vsch is all over the place...

        Can't find Vsc, but there is a Vscan

        Comment

        • Michale32086
          New Member
          • Nov 2011
          • 1453
          • USA

          #5
          Re: PN50B430P2DXZA Sound Nothing Else Part Duex

          If Vsc=Vscan, then it's also all over the place, but in the negative..

          Comment

          • JamesTV
            New Member
            • Nov 2014
            • 3
            • United States

            #6
            Re: PN50B430P2DXZA Sound Nothing Else Part Duex

            If you've really learned alot then you should have learned how to read the label on the panel which should clearly state that VSC/VSCAN is a negative voltage. If it's not correct you will get either a blank screen or what would apear to be black clouds of missing pixels either in blocks, lines or both which is what I have with VSCAN at -44VDC. It should be on this particular panel -193VDC. I as a technician will attempt to fix this board but you as just learning more will probably fare better by replacing the Y-Main board. If you don't you'll probably do more damage than good. If you've fixed it then good work. If not them keep pluggin'.

            Comment

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