HP 840 G5 shows orange charging LED and shows charging icon in windows without battery connected.

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  • Zibbo
    Badcaps Veteran
    • Mar 2017
    • 201
    • Zimbabwe

    #1

    HP 840 G5 shows orange charging LED and shows charging icon in windows without battery connected.

    HP 840 G5 board number 6050A2945601 says "charging" in windows without battery connected. The motherboard looks clean visually, no signs of liquid damage no burnt or missing parts. I have not come across such an issue and I am requesting assistance on where to start troubleshooting.
  • mon2
    Badcaps Legend
    • Dec 2019
    • 13865
    • Canada

    #2
    On the battery connector is a pin that alerts the battery charger that the battery is attached or is not. Usually is an active low signal so if this pin is ‘0’ state or 0 volts, battery IS attached. Vice-versa is battery is absent.

    Confirm the voltage to ground of the pin on the battery connector. Maybe this pin is missing the pull-up resistor to park this signal line to ‘1’ state when the battery is absent.

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    • Zibbo
      Badcaps Veteran
      • Mar 2017
      • 201
      • Zimbabwe

      #3
      Originally posted by mon2
      On the battery connector is a pin that alerts the battery charger that the battery is attached or is not. Usually is an active low signal so if this pin is ‘0' state or 0 volts, battery IS attached. Vice-versa is battery is absent.

      Confirm the voltage to ground of the pin on the battery connector. Maybe this pin is missing the pull-up resistor to park this signal line to ‘1' state when the battery is absent.
      Thank you mon2 but on this particular model the battery connector only has 4 connections, positive, negative and smbus.
      There is 12v on positive and 3.3v on the 2 smbus lines.
      Last edited by Zibbo; 11-03-2024, 07:06 AM.

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      • piernov
        Super Moderator
        • Jan 2016
        • 4435
        • France

        #4
        Battery is internal, it is not supposed to be removed, so that's a non-issue to me.
        OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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        • Zibbo
          Badcaps Veteran
          • Mar 2017
          • 201
          • Zimbabwe

          #5
          Originally posted by piernov
          Battery is internal, it is not supposed to be removed, so that's a non-issue to me.
          I have also noticed that it says "53 minutes remaining to full charge" with or without battery and the battery volatge does not increase.

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          • Prosatanosz
            Senior Member
            • Nov 2015
            • 108
            • Hungary

            #6
            Battery is dead. Asus, Dell, the same thing.

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            • Zibbo
              Badcaps Veteran
              • Mar 2017
              • 201
              • Zimbabwe

              #7
              Originally posted by Prosatanosz
              Battery is dead. Asus, Dell, the same thing.
              Its a good battery, I have tested it on another laptop

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