no hdmi image hp zso50-a944p

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  • mauareju
    Member
    • Oct 2019
    • 17
    • mexico
    #1

    no hdmi image hp zso50-a944p

    hello everyone
    i have a hp whit mobo zso50-a944p that dont detect hdmi when conect to a tv
    i measured all values in the schematic in hdmi cpu line output wich says that need 1v in hdmi data lines and 1.8 in hdmi hpd, ddclk & ddcdata wich i have
    attach the squematic
    what could it be
    thanks in advance
    Attached Files
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    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: no hdmi image hp zso50-a944p

      Sure it's not a software issue? GPU drivers up-to-date? Tried Linux LiveUSB?
      Make sure the HDMI port is not damaged.
      If everything is good, measure in diode mode to ground DDCCLK and DDCDATA, and check with the oscilloscope if you have a clock on DDCCLK and data being exchanged on DDCDATA.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • mauareju
          Member
          • Oct 2019
          • 17
          • mexico
          #3
          Re: no hdmi image hp zso50-a944p

          Originally posted by piernov
          Sure it's not a software issue? GPU drivers up-to-date? Tried Linux LiveUSB?
          Make sure the HDMI port is not damaged.
          If everything is good, measure in diode mode to ground DDCCLK and DDCDATA, and check with the oscilloscope if you have a clock on DDCCLK and data being exchanged on DDCDATA.
          Thanks for your response
          I already tried with live usb but no luck
          When connect the hdmi I have 2 different voltages for ddcclk and ddcdata is that normal?
          In other good working laptop hdmiport I measured and ddcclk & ddcdata have similar voltajes but in the defective laptop theres like .5 volts of difference betwen ddcdata and ddcclk
          Last edited by mauareju; 05-23-2020, 09:18 AM.

            Comment

            • piernov
              Super Moderator
              • Jan 2016
              • 4435
              • France
              #4
              Re: no hdmi image hp zso50-a944p

              Voltage measured with multimeter in DC voltage mode? What about diode mode to ground?
              OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                Comment

                • mauareju
                  Member
                  • Oct 2019
                  • 17
                  • mexico
                  #5
                  Re: no hdmi image hp zso50-a944p

                  yes voltage mode in dc get in ddcdata when its not conected the hdmi port is 3.81v,when is conected 3.51V diode mode gets 515
                  ddcclk gets 4.15v when its not conected, 3.60v when it is conected diode mode gets 515 to
                  this values are in hdmi port output in cpu lines get 1.8v both lines

                    Comment

                    • mauareju
                      Member
                      • Oct 2019
                      • 17
                      • mexico
                      #6
                      Re: no hdmi image hp zso50-a944p

                      Originally posted by piernov
                      Voltage measured with multimeter in DC voltage mode? What about diode mode to ground?
                      yes voltage mode in dc get in ddcdata when its not conected the hdmi port is 3.81v,when is conected 3.51V diode mode gets 515
                      ddcclk gets 4.15v when its not conected, 3.60v when it is conected diode mode gets 515 to
                      this values are in hdmi port output in cpu lines get 1.8v both lines

                        Comment

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