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Asus STRIX GL703GE keyboard issue

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    #1

    Asus STRIX GL703GE keyboard issue

    I need help in troubleshooting an Asus STRIX GL703GE. This laptop has no working keyboard and keyboard lights. Device Manager does not show any keyboard at all (it shows a USB keyboard if connected, but not built in). The touchpad and ON/OFF button are ok. I checked keyboard circuitry on a motherboard, and everything seems to be good except there is no KBL_EN signal on pin #64 of IT8296E120A Keyboard Controller (U23, +3V_S5 is present). Pin #63 LED_PWR#_KB has 3.6V. Pin #1 on KCN1 KB CONN has 5.1V, pins #7-30 have 2.5V. G524 Power Distribution Switch (U24) is not shorted: pin #5 - 5v, pin #4 - 0V, pin #1 - 0V.
    KBID1 not present (pin#36 - KCN1 KB CONN and pin#8 - U23), KR133 and KR91 are ok. Replacement keyboard brings the same issue.

    Does that mean U23 IT8296E_LQFP-64 chip is faulty? If so, is it necessary to program new IT8296E chip?
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    #2
    Re: Asus STRIX GL703GE keyboard issue

    Does the keyboard work in the bios?

    Comment

      #3
      Re: Asus STRIX GL703GE keyboard issue

      No. But the keyboard itself is good.

      Comment

        #4
        Re: Asus STRIX GL703GE keyboard issue

        Remove all power. Measure the resistance to ground of KBL_EN.

        Also check in DIODE mode.

        Meter in diode mode. Red meter lead, yes red to ground.

        Black meter probe to KBL_EN.

        What is the reading?

        Comment

          #5
          Re: Asus STRIX GL703GE keyboard issue

          98.2kOhm

          0.564V

          Comment

            #6
            Re: Asus STRIX GL703GE keyboard issue

            Ok readings.

            What is the voltage to ground of pin #13 (wrst#) on the EC? (U23)

            The KBL_EN is for the keyboard backlight leds.

            The keyboard will be a detection of passive keys being scanned in x&y directions. Is U23 warmer than usual?

            Is it being powered on every rail.

            Comment

              #7
              Re: Asus STRIX GL703GE keyboard issue

              pin #13 - 0.12V

              KR43 - 99kOhm
              KC44 not shorted

              U23 is not warmer as usual.

              P.S. I've motherboard removed from the laptop --> +5V_S5, +3V_S5 are missing. Let me assemble it.
              Last edited by macbook1967; 01-04-2023, 07:39 AM.

              Comment

                #8
                Re: Asus STRIX GL703GE keyboard issue

                +3V_S5 are missing
                Yes and this is causing this EC controller to remain in reset state.

                WRST# = active low signal and pin #13 - 0.12V = RESET state.

                Confirm again after this line is ~3 volts = out of reset state.

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                  #9
                  Re: Asus STRIX GL703GE keyboard issue

                  OK, the laptop is on: pin #13 - 3.28V

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