Zenith Plasma Z42PJ240 has sound but No picture

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  • aasnowskate
    Senior Member
    • Jan 2013
    • 118
    • usa
    #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
    • aasnowskate
      Senior Member
      • Jan 2013
      • 118
      • usa
      #2
      Re: Zenith Plasma Z42PJ240 has sound but No picture

      Here are the pics of the boards.
      Attached Files

        Comment

        • tw2005
          Badcaps Legend
          • Oct 2011
          • 6458
          • Australia
          #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.

            Comment

            • tw2005
              Badcaps Legend
              • Oct 2011
              • 6458
              • Australia
              #4
              Re: Zenith Plasma Z42PJ240 has sound but No picture

              this guide may help
              Attached Files

                Comment

                • newtothis
                  Badcaps Legend
                  • Mar 2013
                  • 1556
                  • england
                  #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

                    Comment

                    • aasnowskate
                      Senior Member
                      • Jan 2013
                      • 118
                      • usa
                      #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?

                        Comment

                        • Alastair E
                          Chief Womble
                          • Mar 2013
                          • 1963
                          • U.K.
                          #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!

                            Comment

                            • aasnowskate
                              Senior Member
                              • Jan 2013
                              • 118
                              • usa
                              #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.

                                Comment

                                • aasnowskate
                                  Senior Member
                                  • Jan 2013
                                  • 118
                                  • usa
                                  #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

                                    Comment

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