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TV Plasma LG 60PN5000 ZSUS 15v missing

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    TV Plasma LG 60PN5000 ZSUS 15v missing

    All Voltages are OK except ZSUS 15v.
    YSUS board disconnected still 15v missing.
    ZSUS was replaced: 15v missing.
    Any help will be appreciated
    Attached Files

    #2
    Re: TV Plasma LG 60PN5000 ZSUS 15v missing

    15V is produced by Y-SUS, so follow the traces on that 15V pin and see where it leads.
    Never power up a plasma with loosened or missing screws on any sustain boards.

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      #3
      Re: TV Plasma LG 60PN5000 ZSUS 15v missing

      I will check the Y-SUS

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        #4
        Re: TV Plasma LG 60PN5000 ZSUS 15v missing

        3ohm R251 Open, Replaced.
        Now I have 15v but fluctuating to 16v and 15v and a metallic sound like tin, tin tin. All other voltages fluctuating a little bit but in range.

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          #5
          Re: TV Plasma LG 60PN5000 ZSUS 15v missing

          There is not green light on the control board and the TV red light is blinking

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            #6
            Re: TV Plasma LG 60PN5000 ZSUS 15v missing

            Further inspection on y-sus is required, test every IGBT and gate drivers for shorts, big resistors (those green ones) cannot be open.
            The inductors on Z and Y buzz when working, but it's at a low frequency.

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              #7
              Re: TV Plasma LG 60PN5000 ZSUS 15v missing

              D603 shorted
              After replace D603 TV works well but instead of measuring 15v it measures 17.8v

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                #8
                Re: TV Plasma LG 60PN5000 ZSUS 15v missing

                If memory serves correct the 15V on LG plasmas is almost always close to 17V, so 17.8 is a small offset from the norm, no need to worry if nothing is overheating and the picture is fine. Is D603 at Y-SUS?

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                  #9
                  Re: TV Plasma LG 60PN5000 ZSUS 15v missing

                  Yes, it is. Thanks for your help.

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