ASUS FX505GD shuts off after POST — no BIOS, power button unresponsive

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  • brav1ez
    New Member
    • Sep 2025
    • 1
    • turkey
    #1

    ASUS FX505GD shuts off after POST — no BIOS, power button unresponsive

    Hello everyone,
    I have an ASUS TUF Gaming FX505GD that's powering on, showing the ASUS logo for about 2 seconds with keyboard backlight, then immediately shuts off. After it shuts down, the power button does nothing until I unplug the laptop completely. No fans spin afterward either.

    I’ve tried:
    - CMOS reset
    - Removing the SSD/HDD
    - Reseating RAM (removing each stick individually stops boot completely)
    - Cleaning up recently applied thermal paste around CPU/GPU and nearby VRM components (issue persists)

    With no RAM installed, the laptop doesn’t power on at all, which seems unusual.

    Important note: I’ve had the internal battery unplugged for years because of a faulty BMS board, so I always run it on AC power only.

    It behaves like a power rail or VRM shutdown, possibly triggered by the embedded controller. I’d appreciate help narrowing down whether it's a shorted capacitor or MOSFET near the CPU/GPU VRM area, or something else entirely.

    Happy to share photos or boardview references if needed—any suggestions, component-level troubleshooting steps, or similar experiences would be greatly appreciated!

    Thanks in advance.
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