Acer Aspire M5-481PT keyboard issue

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  • p1muserfan
    Senior Member
    • Apr 2014
    • 184
    • USA

    #1

    Acer Aspire M5-481PT keyboard issue

    Have an Aspire with a non-working keyboard. I have 3v at pins 19-26 of CN12 (p. 22) like I believe I'm suppose to. No shorted capacitors at CP1-6 (also p. 22). Power at CN12 is coming from the KBC, correct? Maybe I just need a bios flash? Keyboard itself is new.
    Attached Files
  • p1muserfan
    Senior Member
    • Apr 2014
    • 184
    • USA

    #2
    Re: Acer Aspire M5-481PT keyboard issue

    Have no voltage on U28 (p. 8) at pins 4 (ground), 5, or 6. Problem?

    Comment

    • p1muserfan
      Senior Member
      • Apr 2014
      • 184
      • USA

      #3
      Re: Acer Aspire M5-481PT keyboard issue

      Really need a bios dump now, was gonna upload the current file but my programmer can't even id the chip

      Comment

      • ala_borbe
        aka Donald
        • Apr 2011
        • 1625
        • Malta

        #4
        Re: Acer Aspire M5-481PT keyboard issue

        before all do clear cmos, remove batt and dc adaptor

        is your laptop operational? can it boot to win? try flashing from windows... what version of bios is currently on it?

        by looking at website and reading a little, this laptop is a little tricky, it has 3 versions v1.15 should be used on win7, v2.16 and v2.22 came with same laptop with preloaded win8

        maybe wrong verion is flashed, so thats why kbd is not working

        anyway, do not flash bios if you cannot id chip, probably you wont be able to flash properly, and always make backup of your current rom, it can save you a lot of troubles

        check your cables and connectors, maybe that why you dont get id :/
        Last edited by ala_borbe; 12-10-2014, 03:19 AM.
        Im Back... sort of...

        Comment

        • p1muserfan
          Senior Member
          • Apr 2014
          • 184
          • USA

          #5
          Re: Acer Aspire M5-481PT keyboard issue

          Originally posted by ala_borbe
          before all do clear cmos, remove batt and dc adaptor

          is your laptop operational? can it boot to win? try flashing from windows... what version of bios is currently on it?

          by looking at website and reading a little, this laptop is a little tricky, it has 3 versions v1.15 should be used on win7, v2.16 and v2.22 came with same laptop with preloaded win8

          maybe wrong verion is flashed, so thats why kbd is not working

          anyway, do not flash bios if you cannot id chip, probably you wont be able to flash properly, and always make backup of your current rom, it can save you a lot of troubles

          check your cables and connectors, maybe that why you dont get id :/
          Removed the cmos battery for a few minutes and now unit won't start at all. When laptop was operational, I would get Acer splash screen and then the message "no boot device detected, press any key to continue". Of course no key I pressed would get me any further so
          I thought I had a keyboard issue. Tried external usb keyboard to get into bios, F2 didn't work. So now I don't know if there was a keyboard issue or I just didn't input the correct button combo to get into the bios.
          When I removed the bios chip to upload the current file on the chip my programmer couldn't identify it. I've got the same chip I can take from another board but how do I get this thing to fire up again?

          Comment

          • dj_ricoh
            Badcaps Legend
            • Jan 2013
            • 2073
            • uk

            #6
            Re: Acer Aspire M5-481PT keyboard issue

            what does KBC stand for?
            Just cook it! It's already broken.

            Comment

            • p1muserfan
              Senior Member
              • Apr 2014
              • 184
              • USA

              #7
              Re: Acer Aspire M5-481PT keyboard issue

              Originally posted by dj_ricoh
              what does KBC stand for?
              Not sure but same as EC

              Comment

              • ala_borbe
                aka Donald
                • Apr 2011
                • 1625
                • Malta

                #8
                Re: Acer Aspire M5-481PT keyboard issue

                kbc=ec
                kbd = keyboard

                southbridge controls both usb and sata... maybe problem is there
                and it could also make laptop not boot


                sorry for bad english
                Im Back... sort of...

                Comment

                • p1muserfan
                  Senior Member
                  • Apr 2014
                  • 184
                  • USA

                  #9
                  Re: Acer Aspire M5-481PT keyboard issue

                  Removed cmos to check voltage of it (was only 2.5v, got a new one coming), reinstalled, and now board won't start. Can low voltage on cmos cause this?

                  Comment

                  • Th3_uN1Qu3
                    Believe in
                    • Jul 2010
                    • 6031
                    • Romania

                    #10
                    Re: Acer Aspire M5-481PT keyboard issue

                    Sometimes yes. But all boards should power up ok without CMOS battery installed.
                    Originally posted by PeteS in CA
                    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                    A working TV? How boring!

                    Comment

                    • p1muserfan
                      Senior Member
                      • Apr 2014
                      • 184
                      • USA

                      #11
                      Re: Acer Aspire M5-481PT keyboard issue

                      Originally posted by Th3_uN1Qu3
                      But all boards should power up ok without CMOS battery installed.
                      That's what I thought but removing and reinstalling the battery is the only thing I did between it starting and then not starting. Guess I'll know for sure when new battery shows up

                      Comment

                      • ktmmotocross
                        Boardkiller
                        • Feb 2014
                        • 3553
                        • slovakia

                        #12
                        Re: Acer Aspire M5-481PT keyboard issue

                        Originally posted by Th3_uN1Qu3
                        Sometimes yes. But all boards should power up ok without CMOS battery installed.
                        yes but when battery is low it cannot start. thats why i first check battery voltage

                        Comment

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