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    #1

    Asus K555U taking extra current


    Dear Members,
    This laptop used to work with a 19v 3.4A adapter.
    After 4 years of using it, now, the adapter's output voltage drops to 17v when windows loads up. Then the laptop suddenly turns off.
    Today, I have connected a 19.8v 4.5A adapter to this laptop. Then the adapter's output voltage dropped to 19.4v but the laptop worked fine.
    In addition, I noticed that the cpu power coils get warm to about 50'C but the mosfets are cool.
    All the voltage rails on the mainboard are fine without any reduction except for the 19v rail. All the ICs and coils on the mainboard are cool except for the CPU coils. If I connect more components (such as hard drive or screen) to the laptop, the voltage drop is increased. The laptop charges the battery properly. The temperatures of CPU and GPU are fine under 50'C. the input mosfets are fine and not shorted.
    In general, what may happen in a laptop so that the laptop has to take more input current from the adapter?

    Regards
    Tags: None
  • Answer selected by caspian at 05-31-2024, 04:34 AM.
    Originally posted by caspian View Post
    After 4 years of using it, now, the adapter's output voltage drops to 17v when windows loads up.
    That's a bad AC adapter.
    Originally posted by caspian View Post
    Today, I have connected a 19.8v 4.5A adapter to this laptop. Then the adapter's output voltage dropped to 19.4v but the laptop worked fine.
    That's normal.
    • Selected Answer

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      #2
      From what I know the current increases depending on the work load, peripherals connected, if the battery is charging or not... Have you tried to plug your original charger with the battery disconnected? Maybe your battery is faulty, this can cause a raise in the consumption.

      Comment

        #3
        the extra current is taken by pure mainboard without battery, screen, and other peripherals connected.
        However, if I connect battery or peripherals, the drawn current is increased.
        HWInfo shows that CPU is taking between 1A to 8A of current. with a typical current of 4A.
        The maximum current is taken when Windows is loading.
        I do not know what takes this extra current.

        Comment

          #4
          Originally posted by caspian View Post
          After 4 years of using it, now, the adapter's output voltage drops to 17v when windows loads up.
          That's a bad AC adapter.
          Originally posted by caspian View Post
          Today, I have connected a 19.8v 4.5A adapter to this laptop. Then the adapter's output voltage dropped to 19.4v but the laptop worked fine.
          That's normal.
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView
          • Selected Answer

          Comment

            #5
            Originally posted by piernov View Post
            That's a bad AC adapter.

            That's normal.

            OK, thank you
            Your answer makes sense according to the symptoms that I observed.

            Comment

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