Laptop LCD display brightness issue

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  • andyred
    Member
    • Aug 2012
    • 13
    • USA

    #1

    Laptop LCD display brightness issue

    Hello All,

    I encountered these days an issue which I've never seen before and I've repaired a couple of computers so far.
    The LCD display on a Asus N76VZ laptop is always on maximum brightness. Replaced the video cable with a new one, checked if this isn't an OS issue by reinstalling the same OS, another OS (Windows 10, Win 8, Win 7), in neither the brightness cannot be adjusted. Is like the OS is seeing the LCD doesn't have adjustable brightness. There is no OS setting either which is causing this.
    So it remains the hardware. I know when a display or inverter are going bad, display usually gets dim not stuck on maximum brightness.
    Perhaps some of you encountered this before and can provide some advice how to fix it.
    Thanks in advance
  • ktmmotocross
    Boardkiller
    • Feb 2014
    • 3574
    • slovakia

    #2
    Re: Laptop LCD display brightness issue

    did u have brightness slider in power control page?
    Last edited by ktmmotocross; 04-02-2019, 10:01 AM.

    Comment

    • caspian
      Badcaps Legend
      • Oct 2015
      • 1589
      • Laptop

      #3
      Re: Laptop LCD display brightness issue

      find (Fn + key) for brightness adjustment in this laptop. then try to check whether it can decrease brightness or not.

      Comment

      • andyred
        Member
        • Aug 2012
        • 13
        • USA

        #4
        Re: Laptop LCD display brightness issue

        Nothing works, it's not settings/OS related (combo keys, sliders do not work).
        OS was reinstalled as well and it's the same

        Comment

        • caspian
          Badcaps Legend
          • Oct 2015
          • 1589
          • Laptop

          #5
          Re: Laptop LCD display brightness issue

          enter the Bios page and see how is the brightness.

          Comment

          • andyred
            Member
            • Aug 2012
            • 13
            • USA

            #6
            Re: Laptop LCD display brightness issue

            maximum brightness in bios as well

            Comment

            • SMDFlea
              Super Moderator
              • Jan 2018
              • 20551
              • UK

              #7
              Re: Laptop LCD display brightness issue

              Did you install the ATK ACPI driver .
              All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

              Comment

              • andyred
                Member
                • Aug 2012
                • 13
                • USA

                #8
                Re: Laptop LCD display brightness issue

                Yes it is installed (latest version .40). Again this is not software related since I have the maximum brightness in BIOS as well

                Comment

                • caspian
                  Badcaps Legend
                  • Oct 2015
                  • 1589
                  • Laptop

                  #9
                  Re: Laptop LCD display brightness issue

                  It might be a great help if you ask the laptop owner when the problem started to happen. I mean: after what operation on the laptop.

                  Comment

                  • SMDFlea
                    Super Moderator
                    • Jan 2018
                    • 20551
                    • UK

                    #10
                    Re: Laptop LCD display brightness issue

                    Did you replace the screen,or have you tried another one ,have you tried a bios update .
                    All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                    Comment

                    • ktmmotocross
                      Boardkiller
                      • Feb 2014
                      • 3574
                      • slovakia

                      #11
                      Re: Laptop LCD display brightness issue

                      did u have brightness slider in power control page?

                      Comment

                      • andyred
                        Member
                        • Aug 2012
                        • 13
                        • USA

                        #12
                        Re: Laptop LCD display brightness issue

                        @caspian a week ago out of the sudden, the display stopped working, it was the vga cable (two wires broken). I've replaced the cable with a new one but I have this issue. Tested with another known working cable and it's the same.

                        @SMDFlea latest BIOS available installed, screen was not replaced don't have another screen to test with

                        @ktmmotocross Windows 10 v1809 doesn't have a brightness slider in power control page as per design
                        Last edited by andyred; 04-02-2019, 01:02 PM.

                        Comment

                        • Jesse James
                          Senior Member
                          • Sep 2018
                          • 95
                          • Canada

                          #13
                          Re: Laptop LCD display brightness issue

                          I know you said its not os problem but this worked for me in the past

                          go to display adapters. open the tab and right click on the graphics card thing that comes up update driver software browse my computer let me pick select basic display adapter do the same thing again but revert it back to the previous graphics card Basically resetting it, it worked for me. Good luck.

                          Comment

                          • andyred
                            Member
                            • Aug 2012
                            • 13
                            • USA

                            #14
                            Re: Laptop LCD display brightness issue

                            @Jesse James tried absolutely eveything software related...no go

                            Comment

                            • andyred
                              Member
                              • Aug 2012
                              • 13
                              • USA

                              #15
                              Re: Laptop LCD display brightness issue

                              Any other ideas guys?

                              Comment

                              • SMDFlea
                                Super Moderator
                                • Jan 2018
                                • 20551
                                • UK

                                #16
                                Re: Laptop LCD display brightness issue

                                Originally posted by andyred
                                @caspian a week ago out of the sudden, the display stopped working, it was the vga cable (two wires broken). I've replaced the cable with a new one but I have this issue. Tested with another known working cable and it's the same.

                                @SMDFlea latest BIOS available installed, screen was not replaced don't have another screen to test with

                                @ktmmotocross Windows 10 v1809 doesn't have a brightness slider in power control page as per design
                                So, 2 wires were broken, they may have shorted together and damaged something. To see if the fault is on the motherboard you need the Boardview, check the LVDS/PWM area. Try another screen or check the screens PCB for any obvious burnt parts,shorts .
                                All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                                Comment

                                • andyred
                                  Member
                                  • Aug 2012
                                  • 13
                                  • USA

                                  #17
                                  Re: Laptop LCD display brightness issue

                                  Unfortunately I could not find any complete Boardview for the Asus N76VZ model. I could not see any obvious burnt parts or shorts neither on the motherboard, neither on the screen.

                                  Comment

                                  • SMDFlea
                                    Super Moderator
                                    • Jan 2018
                                    • 20551
                                    • UK

                                    #18
                                    Re: Laptop LCD display brightness issue

                                    You can ask for a boardview in the Schematic Requests sub-forum, hopefully someone will have it and post it,if not ,you will have to buy one.
                                    All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                                    Comment

                                    • raajkumar
                                      Badcaps Veteran
                                      • Mar 2015
                                      • 354
                                      • Srilanka

                                      #19
                                      Re: Laptop LCD display brightness issue

                                      Is it responding or showing OSD when you press the hotkeys for Brightness ?
                                      Last edited by raajkumar; 04-03-2019, 08:17 AM.

                                      Comment

                                      • andyred
                                        Member
                                        • Aug 2012
                                        • 13
                                        • USA

                                        #20
                                        Re: Laptop LCD display brightness issue

                                        @raajkumar it's the same on windows 7 or in the bios. It shows the brightness control when you press the keys, but min or max makes no difference, is still maximum brightness
                                        Last edited by andyred; 04-03-2019, 09:24 AM.

                                        Comment

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