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asus ux305ca was dead, now works, but battery is not charging

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    asus ux305ca was dead, now works, but battery is not charging

    hello guys,
    i fixed an asus ux305ca which was not turning on at all. gate-vcc was missing on the first fet (check picture), i removed it and bridged source and drain with a wire (finding the gate-regulator is a rabbit hole...). the battery of the device was completely dead and i think it fried the mainboard. i just bought a new battery (aftermarket, but ok) and this would not charge at all. if the battery is not plugged in, i can measure around 0.845 v on the coil (check picture with mark). i think the battery ic is bad or/and there is more missing than the first gate-vcc of the first fet after the charging port. if the battery is plugged, the laptop ist starting, but the charger voltage would not pass through the dcdc-step down for the right battery charging voltage. laptop is otherwise totally fine. thanks in advance! any ideas?
    Attached Files

    #2
    Re: asus ux305ca was dead, now works, but battery is not charging

    That wont work. The gate of the first mosfet will be equal to souce voltage in this arrangement whereas it should be higher or lower then source depending on whether its n channel or p channel mosfet. Without the correct gate voltage at dc in mosfet, charging circuit will never work whatever you do.

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      #3
      Re: asus ux305ca was dead, now works, but battery is not charging

      Originally posted by mcplslg123 View Post
      That wont work. The gate of the first mosfet will be equal to souce voltage in this arrangement whereas it should be higher or lower then source depending on whether its n channel or p channel mosfet. Without the correct gate voltage at dc in mosfet, charging circuit will never work whatever you do.
      so there are missing multiple gate-vccs on the board? or do you think the charger AND charging gate are coupled? i don't have any schematics, it's a waste of time to search for the gate-elements...

      Comment


        #4
        Re: asus ux305ca was dead, now works, but battery is not charging

        Boardview: https://www.badcaps.net/forum/showpost.php?p=818861
        All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

        Comment


          #5
          Re: asus ux305ca was dead, now works, but battery is not charging

          Originally posted by SMDFlea View Post
          thanks man, but which program do i have to use (openboardview cant open the file)

          Comment


            #6
            Re: asus ux305ca was dead, now works, but battery is not charging

            openboardview can open it with the .fz key.
            All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

            Comment


              #7
              Re: asus ux305ca was dead, now works, but battery is not charging

              Originally posted by SMDFlea View Post
              openboardview can open it with the .fz key.
              do you know another free software then? would help me a lot, thanks

              Comment


                #8
                Re: asus ux305ca was dead, now works, but battery is not charging

                Read your PM .
                All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                Comment


                  #9
                  Re: asus ux305ca was dead, now works, but battery is not charging

                  Originally posted by rediii View Post
                  so there are missing multiple gate-vccs on the board? or do you think the charger AND charging gate are coupled? i don't have any schematics, it's a waste of time to search for the gate-elements...
                  You need to have some patience in trouble shooting a laptop mobo. That's all i want to say.

                  Comment


                    #10
                    Re: asus ux305ca was dead, now works, but battery is not charging

                    Originally posted by mcplslg123 View Post
                    You need to have some patience in trouble shooting a laptop mobo. That's all i want to say.
                    already solved the problem, thank you guys! sry, but i have a lot of work to do, so no time

                    Comment


                      #11
                      Re: asus ux305ca was dead, now works, but battery is not charging

                      So what was the solution then?

                      Comment


                        #12
                        Re: asus ux305ca was dead, now works, but battery is not charging

                        Originally posted by brew99 View Post
                        So what was the solution then?
                        battery ic was faulty and i replaced n-channel mosfet near charging port!

                        thank you guys!

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