HP 15-ec2531nd switching off

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  • dr.thodt
    Senior Member
    • Apr 2016
    • 80
    • Netherlands
    #1

    HP 15-ec2531nd switching off

    Hi,

    I have an HP 15-ec2531nd here which does the following:
    - Turns on. One of both fans goes full throttle. Other doesn't spin up.
    - BIOS works.
    - All self tests pass, except smart pin. Not even with another adapter connected.
    - RAM is ok.
    - RAM slot pins are ok.
    - Battery is ok.

    Whenever I want to boot Windows from m2 SSD system switches off.
    I have a USB stick with several tools on it, including Windows PE. I can browse this stick's menu, but when I start Windows PE, the laptop switches off at the same point where it would when booting Windows from m2.

    Is the EC a suspect? Are there other things I could think of?

    Thanks for your attention.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14148
      • Canada
      #2
      Smart pin = power adapter ID pin? What is the exact error?

        Comment

        • dr.thodt
          Senior Member
          • Apr 2016
          • 80
          • Netherlands
          #3
          Self diagnose says the pin might be bent, which it isn't. Will check tomorrow for the exact message.
          The laptop's behavior is no different with the adapter unplugged.

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14148
              • Canada
              #4
              HP uses an analog voltage to identify the power adapter rating. This voltage is sampled by an analog to digital converter by the EC. Perhaps this voltage is missing.

                Comment

                • dr.thodt
                  Senior Member
                  • Apr 2016
                  • 80
                  • Netherlands
                  #5
                  Perhaps, and something I will investigate. But as said, the issue occurs as well when running from battery. The smart pin should not be an issue then. Unless it is.

                    Comment

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