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ASUS Zephyrus GA401I Severe Lag, Suspect Motherboard/Power Issue - Need Help Diagnosing

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    #1

    ASUS Zephyrus GA401I Severe Lag, Suspect Motherboard/Power Issue - Need Help Diagnosing

    Hi everyone,

    I'm having a serious issue with my ASUS Zephyrus GA401I (4 years old, worked perfectly until recently). The system is lagging heavily, even in the BIOS, and is charging extremely slowly (a few percent in hours), making it nearly unusable. I suspect a motherboard or power delivery issue.

    Symptoms:
    • Severe lag across the system, including BIOS navigation.
    • Slow boot times and unresponsive performance in Windows.
    • Battery charges very slowly (e.g., ~5% in 2–3 hours).
    • No error messages or BSODs, just extreme sluggishness.

    What I've Tried:
    • Replaced the charger – no improvement in lag or charging speed.
    • Replaced the battery – no change in symptoms.
    • Tested running on adapter only (no battery) – same lag issue.
    • Verified charger pin voltage – it's good.
    • Reformatted the system (clean Windows install) – no effect.
    • Tested RAM with MemTest86 – no errors detected.
    • Visually inspected the motherboard – no obvious signs of damage (e.g., burnt components, bulging caps), but I'm not an expert.
    Tags: asus, motherboard repair, schematics request, troubleshooting
    #2
    Charging controller is a BQ24780S? If yes, resistances between ACN and ACP pins at the controller?
    FairRepair on YouTube

    Comment

      #3
      Originally posted by Sephir0th View Post
      Charging controller is a BQ24780S? If yes, resistances between ACN and ACP pins at the controller?
      I am not at home right now. Give me some time then I will try this. This has to be done with the laptop not plugged in, right?

      Comment

        #4
        Originally posted by MakNCheese View Post

        I am not at home right now. Give me some time then I will try this. This has to be done with the laptop not plugged in, right?
        Correct, no power at all
        FairRepair on YouTube

        Comment

          #5
          Another thing to look for is PROCHOT#

          Comment

            #6
            Originally posted by Sephir0th View Post
            Charging controller is a BQ24780S? If yes, resistances between ACN and ACP pins at the controller?
            Yes, it is BQ24780S. I tried this using my multiple probes, but they are not thin enough. So, couldn't get a perfect reading. One time it was 80 ohms, and the next time, I tried it was 4.60 k ohms. I have ordered new fine probes and will get readings again

            Comment

              #7
              Originally posted by mcplslg123 View Post
              Another thing to look for is PROCHOT#
              Thanks for the response. Could you please let me know how to do that?

              Comment

                #8
                Originally posted by MakNCheese View Post

                Yes, it is BQ24780S. I tried this using my multiple probes, but they are not thin enough. So, couldn't get a perfect reading. One time it was 80 ohms, and the next time, I tried it was 4.60 k ohms. I have ordered new fine probes and will get readings again
                Share a picture of the charging controller and surrounding circuit please. We will find suitable measurement points.
                FairRepair on YouTube

                Comment

                  #9
                  Ryzen CPU? You can download HWINFO64
                  https://www.hwinfo.com/download/
                  Get the portable version, open it and select "Sensors only"
                  Then scroll down until you get something like this

                  Click image for larger version Name: prochot.jpg Views: 17 Size: 89.0 KB ID: 3652505
                  If it shows PROCHOT_EXT as "yes", that's the issue
                  Another thing to look for is the CPU will be stuck at 400MHz
                  It happened to me on a HP laptop, could be anything like a bad pull-up resistor on that line, to an IC pulling down the line for whatever reason

                  Comment

                    #10
                    Originally posted by m1ch43lzm View Post
                    Ryzen CPU? You can download HWINFO64
                    https://www.hwinfo.com/download/
                    Get the portable version, open it and select "Sensors only"
                    Then scroll down until you get something like this

                    Click image for larger version Name: prochot.jpg Views: 17 Size: 89.0 KB ID: 3652505
                    If it shows PROCHOT_EXT as "yes", that's the issue
                    Another thing to look for is the CPU will be stuck at 400MHz
                    It happened to me on a HP laptop, could be anything like a bad pull-up resistor on that line, to an IC pulling down the line for whatever reason
                    Do you think that PROCHOT could be the reason? I'm asking because the battery is also not charging properly and very slowly. If prochot is the issue, the battery should charge at normal speed when the pc is off?
                    I formatted the SSD but couldn't install Windows on it because of system running very slow to check prochot I will have to install another SSD on it.

                    Comment

                      #11
                      Schematics for the GA401IH, may be close https://www.badcaps.net/forum/troubl...-ga401iv-br9n6

                      From the schematics the charger IC PU8900 has a connection to PROCHOT#, and there's a circuit for HW throttle on the same page that also goes to PROCHOT#, so yes, it may be related to a fault in the charge circuit
                      SN2867 = BQ24780S

                      Comment

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