Request for Help – ASUS G531GW Rev 1.6 – No Power On

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  • conghuyms
    Member
    • Apr 2022
    • 29
    • Vietnam

    #1

    Request for Help – ASUS G531GW Rev 1.6 – No Power On

    Request for Help – ASUS G531GW Rev 1.6 – No Power On

    Hello everyone,

    I need your support with an ASUS G531GW Rev 1.6 laptop.

    When I plug in the charger, the battery charging LED turns on, but the board does not power on when pressing the power button.

    Here’s what I’ve checked so far:
    • Motherboard has been removed for inspection.
    • 3V and 5V always-on rails are present (3V/5V_ALW).
    • 1.8V and 1.09V at the PCH are present.
    • I don’t have the boardview/schematic, so troubleshooting is limited.
    • I tried checking the power button signal from the keyboard connector (embedded power button design).
      • Only two pins show voltage:
        • Pin 4 from the left has 2.47V
        • Pin 5 from the left has 3.2V
        • Upon applying power, the measured current consumption is 0.04 A
      • All other pins have no voltage.

    I'm unsure what to check next from here. Could this be an EC (Embedded Controller) or PCH issue? Or is there something else I should verify?

    Any guidance would be greatly appreciated. Thank you in advance!
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14047
    • Canada

    #2
    Remove all power. Meter in resistance mode. Measure the resistance to ground of each inductor. Checking for low resistance which may indicate a short on that buck regulator power rail. Post any suspects.

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