Alienware LA-9331P - LCD work only when inserted HDMI

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  • ktmmotocross
    Boardkiller
    • Feb 2014
    • 3628
    • slovakia
    #1

    Alienware LA-9331P - LCD work only when inserted HDMI

    Hello.
    Have this Alienware LA-9331P, that have no video/only BKL/ and 8 beeps/LCD error/. But when insert HDMI, LCD works ok.

    Board is buyed as refurbished from aliexpress and i found bad soldering on ic UV31

    Can anybody point me to signal that can be bad? i think it is some LCD detection

    Link to Schematic https://www.badcaps.net/forum/troubl...331p-schematic
    Tags: None
    • Scotchmist
      Senior Member
      • Apr 2019
      • 60
      • United Kingdom
      #2
      Re: Alienware LA-9331P - LCD work only when inserted HDMI

      Check the LCD cable from the motherboard to the screen, could be loose, bad connection or broken wire

        Comment

        • dellxps15
          Badcaps Legend
          • Feb 2014
          • 1598
          • italy
          #3
          Re: Alienware LA-9331P - LCD work only when inserted HDMI

          Originally posted by ktmmotocross
          Hello.
          Have this Alienware LA-9331P, that have no video/only BKL/ and 8 beeps/LCD error/. But when insert HDMI, LCD works ok.

          Board is buyed as refurbished from aliexpress and i found bad soldering on ic UV31

          Can anybody point me to signal that can be bad? i think it is some LCD detection
          most of that notebook that had installed windows 10 + evga precision software got edp lcd bios panel corrupted.

          if internal lcd is working, make a dump of its internal edp and compare to others. with a live linux distro u can restore that firmware

            Comment

            • SMDFlea
              Super Moderator
              • Jan 2018
              • 21945
              • UK
              #4
              Re: Alienware LA-9331P - LCD work only when inserted HDMI

              It could be switching problem rather than the EDID.Check UV27,UV28,UV29,UV27.

              EDIT: just remembered about an old thread where that U27 chip gave some problems with a snowy screen

              https://www.badcaps.net/forum/showth...t=PI3LVD1012BE

              .
              Last edited by SMDFlea; 04-27-2021, 06:40 AM.
              All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                Comment

                • ktmmotocross
                  Boardkiller
                  • Feb 2014
                  • 3628
                  • slovakia
                  #5
                  Re: Alienware LA-9331P - LCD work only when inserted HDMI

                  what to check on it? what signal can be bad when display works ok

                    Comment

                    • ktmmotocross
                      Boardkiller
                      • Feb 2014
                      • 3628
                      • slovakia
                      #6
                      Re: Alienware LA-9331P - LCD work only when inserted HDMI

                      Originally posted by ktmmotocross
                      what to check on it? what signal can be bad when display works ok

                      try to replace UV31 but still the same

                        Comment

                        • ktmmotocross
                          Boardkiller
                          • Feb 2014
                          • 3628
                          • slovakia
                          #7
                          Re: Alienware LA-9331P - LCD work only when inserted HDMI

                          Ok so it is maybe my fault. i put in GTX970 which on older bios like this A14 dont work normally. i put in GTX770M and it work normally.

                          Try to put in never bios so that 970 can work

                            Comment

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