ASUS TUF FA506IV-AS76 vram mosfet short, then battery cant charge

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  • Bonzas
    Badcaps Veteran
    • Jan 2018
    • 471
    • Indonesia

    #21
    I have question about MBCLK & MBDATA voltage, i got this board today. short 19v on tiny caps. Laptop turn on now but problem with charging, battery not detect, tried 2 good battery.

    Then i measure all voltage on BQ24780S, what missing is MBCLK voltage, is this voltage appear/standby when battery or charger connected or after switch on ? BQ was replace 2 times and without success

    Sorry for hijacking people thread, i think it's ok cause i got same board

    Thanks

    Comment

    • mon2
      Badcaps Legend
      • Dec 2019
      • 14190
      • Canada

      #22
      Does MBDATA have a voltage to ground? If yes then check if MBCLK is missing a pull up resistor to the same power rail. It is required.

      Comment

      • Bonzas
        Badcaps Veteran
        • Jan 2018
        • 471
        • Indonesia

        #23
        yes i have 3.3v on mbdata, on Charging IC, ITE and battery connector. Pull up resistor not missing,both present on MBDATA and MBCLK. Both resistor 4.7Kohm from 3cvpu to to ITE. only missing MBCLK, no short when i remove pull up resistor, already try remove 2 sensor ic that connected to mbdata & mbclk but no luck, still missing mbclk. could it be bad ITE or EC firmware ?

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 14190
          • Canada

          #24
          You can check if the pin is defective in diode mode. Meter in diode mode. Remove all power. Red meter probe, yes red to ground.
          black meter probe to mbdata. What is the measurement?
          repeat for Mbclk. Post each measurement.

          Comment

          • Bonzas
            Badcaps Veteran
            • Jan 2018
            • 471
            • Indonesia

            #25
            i'll continue tomorrow give update

            Comment

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