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Problem with asus x541

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    #1

    Problem with asus x541

    Good people, how are you? They can give me a hand. I got an Asus X541 that does not turn on. I started checking and the entry mosfet was short. It was replaced, but the 19v did not pass to the other side. Looking a bit at the Boardview, I realized that I have no voltage in ACOK (0.5v) according to the datasheet it has to be high, I have 18.55v in VCC and 2.4v in ACDET. Any way to go? Thanks!
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    #2
    Re: Problem with asus x541

    Try replacing the charging IC.

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      #3
      Re: Problem with asus x541

      Originally posted by Titoo73 View Post
      Good people, how are you? They can give me a hand. I got an Asus X541 that does not turn on. I started checking and the entry mosfet was short. It was replaced, but the 19v did not pass to the other side. Looking a bit at the Boardview, I realized that I have no voltage in ACOK (0.5v) according to the datasheet it has to be high, I have 18.55v in VCC and 2.4v in ACDET. Any way to go? Thanks!
      ACDET must be above 2.4V. mostly 2.7V. so check resistor divider
      Last edited by ktmmotocross; 05-02-2021, 10:47 PM.

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        #4
        Re: Problem with asus x541

        Originally posted by Titoo73 View Post
        2.4v in ACDET
        2,5-2,7v

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          #5
          Re: Problem with asus x541

          Originally posted by DarkMooon View Post
          2,5-2,7v
          no. 2.5-2.9V. 2.7 is normal

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            #6
            Re: Problem with asus x541

            Originally posted by ktmmotocross View Post
            no. 2.5-2.9V. 2.7 is normal

            replace the ic, ACDET is 2.5v. I had to change one of the resistors. Will it have a difference from 2.5v to 2.7v?

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              #7
              Re: Problem with asus x541

              Originally posted by ktmmotocross View Post
              no. 2.5-2.9V. 2.7 is normal
              in the boardview it appears that it has a divisor of 127k 1% and 20k 1%

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                #8
                Re: Problem with asus x541

                acdet AT 2.5v is not a problem as its very close to the desired value. In my experience it works at 2.5-2.7v range without much issues. Try replacing the charging IC first as your acok at 0.5V is the real issue.

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                  #9
                  Re: Problem with asus x541

                  Originally posted by mcplslg123 View Post
                  acdet AT 2.5v is not a problem as its very close to the desired value. In my experience it works at 2.5-2.7v range without much issues. Try replacing the charging IC first as your acok at 0.5V is the real issue.
                  I already replaced it twice. The truth is that I find it strange

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                    #10
                    Re: Problem with asus x541

                    raise the resistor that joins acok with the rest of the board and now I have 1.2v, on the other side I have a mosfet (pq8905) I'm going to leave the boardview in case someone can give it a look

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                      #11
                      Re: Problem with asus x541

                      Boardview
                      Attached Files

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                        #12
                        Re: Problem with asus x541

                        ok, I put it back together because I remembered the Asus screw and it turned on. The point is that the joy lasted 15sec. I am suspecting a Schottsky diode that is linked to the load IC

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                          #13
                          Re: Problem with asus x541

                          I think the motherboard is cursed. It had started after changing the diode in a stable way. The battery is bad, it was replaced, but now I have no image

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