ASUS N56VZ Black screen, wrong EDID ?

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  • mikkele86
    Senior Member
    • Apr 2017
    • 78
    • Danmark
    #1

    ASUS N56VZ Black screen, wrong EDID ?

    Hello.

    i have a ASUS N56VZ with black screen.
    Backlight is on and working. i can turn it on and off.
    intel HD 4000 working and driver up to date.

    I have tried all the classics, reinstall windows 1903 clean image.
    failsafe remove with DDU. etc. etc.
    the screen remains black.

    my screen is detected as "Flat Panel (1024x768 60Hz)".
    im suspecting it might be a EDID problem.

    I tried to read the EDID but im not sure if its done correctly.
    This is a first for me.

    The display is a "SAMSUNG LTN156HL01-101"

    Enyone who can help ?

    Thanks
    Attached Files
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: ASUS N56VZ Black screen, wrong EDID ?

      First thing would be to try with another panel.

      The attached EDID doesn't seem like it's the EDID from the panel, but rather some kind of "default" EDID.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • mikkele86
          Senior Member
          • Apr 2017
          • 78
          • Danmark
          #3
          Re: ASUS N56VZ Black screen, wrong EDID ?

          19v and 3.3v ok on both screen.
          Second display ok.

          Time for some diagnostics on the Samsung display ?
          Attached Files

            Comment

            • SMDFlea
              Super Moderator
              • Jan 2018
              • 20707
              • UK
              #4
              Re: ASUS N56VZ Black screen, wrong EDID ?

              What programmer did you use to read the EDID, and which chip was it. Was it the one marked 416WP
              Last edited by SMDFlea; 08-21-2019, 03:28 PM.
              All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                Comment

                • piernov
                  Super Moderator
                  • Jan 2016
                  • 4435
                  • France
                  #5
                  Re: ASUS N56VZ Black screen, wrong EDID ?

                  The EDID ROM is the one marked 402WP. I think the label on the board is "ICED", to the right of the LCD connector.
                  Fuse F2 may or may not be the fuse that supplies power to the EDID ROM chip.
                  Last edited by piernov; 08-22-2019, 02:46 AM.
                  OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                    Comment

                    • mikkele86
                      Senior Member
                      • Apr 2017
                      • 78
                      • Danmark
                      #6
                      Re: ASUS N56VZ Black screen, wrong EDID ?

                      So i plugged in the Samsung display and its working again :S
                      Could this just be connection gone bad ?

                      i tried to push gently around the LCD connection and cable, all seems good
                      Attached Files

                        Comment

                        • piernov
                          Super Moderator
                          • Jan 2016
                          • 4435
                          • France
                          #7
                          Re: ASUS N56VZ Black screen, wrong EDID ?

                          Yes, can be caused by a bad connection, that's why I said to try to clean the LCD connector.
                          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                            Comment

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