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Zenith Plasma Z42PJ240 has sound but No picture

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    #1

    Zenith Plasma Z42PJ240 has sound but No picture

    I have a Zenith Plasma M# Z42PJ240 that has sound, but no picture. I replaced the Y SUS board and still has the same problem.
    On the logic board, the D101 is not lit up at all.
    I did the test on the logic board that involves putting a resistor on the EX AUTO GEN and it did not change anything.
    Does anyone know if not having a blinking D101 is evidence that the logic board is not working?
    Thanks for any help. I will get some pics uploaded.
    Tags: None
    #2
    Re: Zenith Plasma Z42PJ240 has sound but No picture

    Here are the pics of the boards.
    Attached Files

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      #3
      Re: Zenith Plasma Z42PJ240 has sound but No picture

      would appear it needs to be blinking. My understanding is auto-gen is shorted not a resistor for the test patterns?
      Attached Files
      Last edited by tw2005; 04-27-2015, 03:39 PM.

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        #4
        Re: Zenith Plasma Z42PJ240 has sound but No picture

        this guide may help
        Attached Files

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          #5
          Re: Zenith Plasma Z42PJ240 has sound but No picture

          TW is right, I resistor will not allow the test patterns to show.. Simply a wire or similar is needed

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            #6
            Re: Zenith Plasma Z42PJ240 has sound but No picture

            Thanks for the response. I did a wire first, then read in another thread that it needed a resistor. The wire and resistor had the same result: no test pattern.
            Does anyone think that it may be the logic board?

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              #7
              Re: Zenith Plasma Z42PJ240 has sound but No picture

              VERY common fault with this LG based chassis is No Vs caused by the SUS_Up and SUS_Dn IGBT's on the Y-SUS board gone short. Quick check with DVM will tell you

              You probably got a dead YSUS from whoever you got it from....
              TELEFIX

              How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
              http://www.irf.com/technical-info/appnotes/an-1088.pdf
              PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

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                #8
                Re: Zenith Plasma Z42PJ240 has sound but No picture

                I have voltage coming from VS on YSUS. It is about 175 VDC that cycles down to 0 and then back to 175 and keeps cycling. I hope that makes sense. That is on the new board.

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                  #9
                  Re: Zenith Plasma Z42PJ240 has sound but No picture

                  Well after putting a YSUS and a ZSUS in, and having no difference, I put the logic board in. That was the fix. $29.99 on ebay. I should have stuck with my first instincts. Thanks for the help. TW2005

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