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Laptop voltages at coils and meanings?

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    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

    #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.

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      #3
      Re: Laptop voltages at coils and meanings?

      Originally posted by rielfreak View Post
      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?

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