Acdrv not genarating

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  • RATIM SIDDIQUE
    New Member
    • May 2024
    • 7
    • bangladesh
    #1

    Acdrv not genarating

    Lenovo fs44a&fs54a nm-c171 rev:1.0 board
    charging ic bg24780s
    Dc in-19v
    Regn-6v
    Acdetect-2.8v
    Acok low
    No volt in acdrv pin
    laptop running fine with battery
    no power without battery
    help me plz

    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13850
      • Canada
      #2
      Remove all power. Meter in resistance mode.

      Measure the resistance across the DC-in mosfets (full details in the sticky above by @Piernov).

      Measure:

      source (1-2-3) & drain (5-6-7-8)
      source (1-2-3) & gate (4)
      gate (4) & drain (5-6-7-8)

      Post each measurement of each DCin mosfet. If ACDRV is low, the fault is likely a defective mosfet which is being driven by this charger pin. In series with ACDRV is often a ~4k ohm resistor. You can flux and carefully remove this resistor. Do not lose the part.

      Then power up again to check if ACDRV is ~25v without this resistor driving the mosfets. Best to check the resistance without power on the same mosfets.

        Comment

        • RATIM SIDDIQUE
          New Member
          • May 2024
          • 7
          • bangladesh
          #3
          Thank u so much
          pq202 was faulty
          I repalaced it,now working fine
          Again thanks for your advice

            Comment

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