Laptop voltages at coils and meanings?

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  • paulyboy
    Senior Member
    • Mar 2020
    • 130
    • New Zealand
    #1

    Laptop voltages at coils and meanings?

    I've recently started learning repairs reading YouTube etc


    My question is I have a few Asus and hps that don't have any boardviews or schematics so I was wondering if there's a best sequence to follow in troubleshooing a laptop that isn't powering on.

    I see there's various coils on most boards and I'm sure there realitive to 3v 5v memory? Cpu?

    I guess I'm asking is what would one expect to find traditionaly on most motherboards and look to measure values from.

    Kind regards

    Paul
    Tags: None
    • rielfreak
      Member
      • Jul 2017
      • 23
      • Philippines
      #2
      Re: Laptop voltages at coils and meanings?

      I usually start with the main +19V (voltage rail after the 2 mosfets from DC in jack) then power button 3V pullup then the main 3V/5V regulator. HPs should have a white light in the DC in jack when plugged in without battery.

        Comment

        • paulyboy
          Senior Member
          • Mar 2020
          • 130
          • New Zealand
          #3
          Re: Laptop voltages at coils and meanings?

          Originally posted by rielfreak
          I usually start with the main +19V (voltage rail after the 2 mosfets from DC in jack) then power button 3V pullup then the main 3V/5V regulator. HPs should have a white light in the DC in jack when plugged in without battery.
          Thankyou for your reply, is there a sequence in how they turn on to know when a power rail is missing?

            Comment

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