Lenovo BYG40 NM A411 No power

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  • psdavid65
    Member
    • Dec 2021
    • 24
    • Ghana
    #1

    Lenovo BYG40 NM A411 No power

    Quick question please.
    Does anyone have an idea what voltage is supposed to be on VUSB, and PD7, VUSB_OPEN and drain of PQ12.
    The schematic for the motherboard is BYG40 NM A411
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14024
      • Canada
      #2
      Re: Lenovo BYG40 NM A411 No power

      Vusb is based on the USB specification and should be about +5 volts. Often this power rail is enabled by a USB load switch which defines the max current draw of the mating downstream USB device. If the current draw is exceeded, the switch is expected to turn off and report this fault to the upstream USB host controller. This event then raises a pop up balloon flag in the windows task bar.

      If you are missing this vusb rail, look for a damaged USB load switch nearby.

        Comment

        • psdavid65
          Member
          • Dec 2021
          • 24
          • Ghana
          #3
          Re: Lenovo BYG40 NM A411 No power

          Thank you for the speedy reply. I'm grateful.

            Comment

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