Asus Vivobook M3502Q, no power through USB-C, works on battery.

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  • Gregoriy Kim
    New Member
    • Mar 2024
    • 4
    • Республика Корея
    #1

    Asus Vivobook M3502Q, no power through USB-C, works on battery.

    Hello everyone!

    Need help with Asus Vivobook M3502Q, Ryzen 5.
    First time working with failed power supply via USB-C ports. no schematics available.
    Symptoms:
    suddenly turned off and does not turn on,

    Upon first observation, turned out both CSD87501 mosfets had unsoldered due to overheating.
    Manually charged battery and laptop works on battery

    Soldered 2 new CSD87501 on board, but it didn't solve the issue.

    there is 3.3V and 1.6V from TPS65994. and it talks to charger, so charger sends 20V, but no load. There is 20V present on supply side of CSD87501, but either 9V or 0V on gate.
    No 5V

    No shorts detected.

    As I mentioned before this is my first time working with this type of power delivery system.

    If anyone had same problem, could you please help?



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