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    asus x55A no power

    Hello.
    Have this asus X55A and i have 19V before the first power mosfet and 0.89V after the mosfet.

    i cannot find schematic so any help would be needed

    #2
    Re: asus x55A no power

    find the qfn chips!

    model and see what they do.
    first is first did you find any fets broken or caps?
    Just cook it! It's already broken.

    Comment


      #3
      Re: asus x55A no power

      i measure the charger ic bq24725
      Attached Files
      Last edited by ktmmotocross; 10-17-2014, 04:15 PM.

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        #4
        Re: asus x55A no power

        maybe this can help you;
        Attached Files

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          #5
          Re: asus x55A no power

          already have it but its totally different hw

          Comment


            #6
            Re: asus x55A no power

            when i inject 19V to base of first mosfet system works. there must be something that prevents ic to launch full 19V signal to that mosfet.

            charging led is on but no voltage goes to battery, but i dont know the life of battery
            Last edited by ktmmotocross; 10-18-2014, 12:31 AM.

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              #7
              Re: asus x55A no power

              Swap then.
              That ic opens with gate the fet for battery and adapter.
              Just cook it! It's already broken.

              Comment


                #8
                Re: asus x55A no power

                i agree to dj_ricoh, try to swap these mosfet

                Comment


                  #9
                  Re: asus x55A no power

                  mosfet is good. ricoh means swap ic

                  Comment


                    #10
                    Re: asus x55A no power

                    Originally posted by ktmmotocross View Post
                    Hello.
                    Have this asus X55A and i have 19V before the first power mosfet and 0.89V after the mosfet.

                    i cannot find schematic so any help would be needed
                    Hello friend.
                    That means your second PQ´s not activating, the first Mosfet is a Díode Mosfet and it doesn´t need the voltage on gate to activate, i may need 0v on pin 4 of second Mosfet to activate.


                    It looks like you don´t have +/- 6V gate sinal on second PQ.
                    Last edited by Claudio Silva; 10-19-2014, 05:14 PM.

                    Comment


                      #11
                      Re: asus x55A no power

                      i order some of these charger is because 5 laptops with DDR3 IN A ROW have bad this ic.

                      or if customer wont pay for replace i just inject 19V to ACDRV signal rail to have system work but without battery and charger.

                      Comment


                        #12
                        Re: asus x55A no power

                        Originally posted by ktmmotocross View Post
                        i order some of these charger is because 5 laptops with DDR3 IN A ROW have bad this ic.

                        or if customer wont pay for replace i just inject 19V to ACDRV signal rail to have system work but without battery and charger.
                        I´d inject 6v to 9v on second PQ, that´s a PNP Mosfet injecting 19v may be too high.

                        Comment


                          #13
                          Re: asus x55A no power

                          Originally posted by dj_ricoh View Post
                          find the qfn chips!

                          model and see what they do.
                          first is first did you find any fets broken or caps?

                          may i know the qnf?

                          Comment


                            #14
                            Re: asus x55A no power

                            Originally posted by lorins_core View Post
                            may i know the qnf?
                            What is a QFN?

                            Comment


                              #15
                              Re: asus x55A no power

                              This is it QFN quad-flat no-leads
                              The bit that controls the charging/ input chip

                              Comment


                                #16
                                Re: asus x55A no power

                                Originally posted by cyberhack View Post
                                This is it QFN quad-flat no-leads
                                The bit that controls the charging/ input chip
                                Thanks for your answer, but can you please explain a bit more?
                                QFN is a enable pin that turns on or off the Charge IC?

                                Comment


                                  #17
                                  Re: asus x55A no power

                                  my computer does not come apart in wolt. 3v 5v I can not. I changed ıt8517. I changed the bq25. still no wolt

                                  Comment


                                    #18
                                    Re: asus x55A no power

                                    I find second mosfet ,from dc_in konektor, shorted almost always...
                                    Last edited by Djosla; 03-11-2015, 10:26 AM.

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                                      #19
                                      Re: asus x55A no power

                                      you fixed you laptop ?
                                      I have the same similar problem

                                      Comment


                                        #20
                                        Re: asus x55A no power

                                        i have asus x55A
                                        my laptop completely is dead not even one LED all is off What is broken on my laptop
                                        can someone help me

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