Asus STRIX GL703GE keyboard issue

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  • macbook1967
    New Member
    • Feb 2022
    • 9
    • US
    #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?
    Attached Files
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    • mon2
      Badcaps Legend
      • Dec 2019
      • 13867
      • Canada
      #2
      Re: Asus STRIX GL703GE keyboard issue

      Does the keyboard work in the bios?

        Comment

        • macbook1967
          New Member
          • Feb 2022
          • 9
          • US
          #3
          Re: Asus STRIX GL703GE keyboard issue

          No. But the keyboard itself is good.

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13867
              • Canada
              #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

                • macbook1967
                  New Member
                  • Feb 2022
                  • 9
                  • US
                  #5
                  Re: Asus STRIX GL703GE keyboard issue

                  98.2kOhm

                  0.564V

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13867
                      • Canada
                      #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

                        • macbook1967
                          New Member
                          • Feb 2022
                          • 9
                          • US
                          #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

                            • mon2
                              Badcaps Legend
                              • Dec 2019
                              • 13867
                              • Canada
                              #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.

                                Comment

                                • macbook1967
                                  New Member
                                  • Feb 2022
                                  • 9
                                  • US
                                  #9
                                  Re: Asus STRIX GL703GE keyboard issue

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

                                    Comment

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