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

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    #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
    #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

      #3
      Re: Alienware LA-9331P - LCD work only when inserted HDMI

      Originally posted by ktmmotocross View Post
      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

        #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

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          #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

            #6
            Re: Alienware LA-9331P - LCD work only when inserted HDMI

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

            try to replace UV31 but still the same

            Comment

              #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

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