Asus k43u no power

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  • String2016
    Badcaps Legend
    • Nov 2015
    • 2230
    • philippines

    #1

    Asus k43u no power

    I have this Asus k43u PBL50 LA-7321P REV:1A, 19v is present but on power button and on JBTN1 pin 1 ON/OFFBTN# has 17v instead of 3.3v.on the bios chip there is no 3.3 on pin 8, anyone can help on this please
  • Techtiger
    Badcaps Legend
    • Oct 2014
    • 1601
    • france

    #2
    Re: Asus k43u no power

    One of the components are faulty PU301 PQ303 PQ304

    Comment

    • String2016
      Badcaps Legend
      • Nov 2015
      • 2230
      • philippines

      #3
      Re: Asus k43u no power

      I check pq303 pin 1 and pin4 are beeping does this short?

      Comment

      • Techtiger
        Badcaps Legend
        • Oct 2014
        • 1601
        • france

        #4
        Re: Asus k43u no power

        Originally posted by Mulong2019
        I check pq303 pin 1 and pin4 are beeping does this short?
        remove PQ303 out of the bed & test S D G if short replace RT8202 check voltage pin 16 13 17 3 8 14

        Comment

        • String2016
          Badcaps Legend
          • Nov 2015
          • 2230
          • philippines

          #5
          Re: Asus k43u no power

          @Techtiger thanks for the response, replaced pq303 mosfet now no beeping on the pin1 and pin 4 and here is the measurement of RT chip pu301

          pin 13= 3v
          pin16= 19v
          pin17=5v
          pin14=2v
          pin3=2v
          pin8=3.3v

          Comment

          • String2016
            Badcaps Legend
            • Nov 2015
            • 2230
            • philippines

            #6
            Re: Asus k43u no power

            On PQ303 no voltage on S and G on drain it has 1.5v fluctuating voltage

            Comment

            • Techtiger
              Badcaps Legend
              • Oct 2014
              • 1601
              • france

              #7
              Re: Asus k43u no power

              Originally posted by Mulong2019
              On PQ303 no voltage on S and G on drain it has 1.5v fluctuating voltage
              do you get B+ on PL301 19V ?

              Comment

              • Techtiger
                Badcaps Legend
                • Oct 2014
                • 1601
                • france

                #8
                Re: Asus k43u no power

                Originally posted by Mulong2019
                @Techtiger thanks for the response, replaced pq303 mosfet now no beeping on the pin1 and pin 4 and here is the measurement of RT chip pu301

                pin 13= 3v
                pin16= 19v
                pin17=5v
                pin14=2v
                pin3=2v
                pin8=3.3v
                the voltage on RT is fine what is the voltage on PL305?

                Comment

                • String2016
                  Badcaps Legend
                  • Nov 2015
                  • 2230
                  • philippines

                  #9
                  Re: Asus k43u no power

                  PL301 have B+ 19v but PL305 both sides 0v

                  Comment

                  • String2016
                    Badcaps Legend
                    • Nov 2015
                    • 2230
                    • philippines

                    #10
                    Re: Asus k43u no power

                    PQ305 pin1 S and pin4 G beeping

                    Comment

                    • String2016
                      Badcaps Legend
                      • Nov 2015
                      • 2230
                      • philippines

                      #11
                      Re: Asus k43u no power

                      replaced PQ305 still same issue PL305 no voltage

                      Comment

                      • Techtiger
                        Badcaps Legend
                        • Oct 2014
                        • 1601
                        • france

                        #12
                        Re: Asus k43u no power

                        check resistance to GND on PL303 PL305 left one PAD of each coil & try if the voltage is back if not replace PC305 PC303

                        Comment

                        • String2016
                          Badcaps Legend
                          • Nov 2015
                          • 2230
                          • philippines

                          #13
                          Re: Asus k43u no power

                          PL303 Pullout 1 side= 11omhs PL305 pullout 1side =2.2ohms tried plugged in with 1 side pullout still no voltage on PL303 and Pl305

                          Comment

                          • Techtiger
                            Badcaps Legend
                            • Oct 2014
                            • 1601
                            • france

                            #14
                            Re: Asus k43u no power

                            Originally posted by Mulong2019
                            PL303 Pullout 1 side= 11omhs PL305 pullout 1side =2.2ohms tried plugged in with 1 side pullout still no voltage on PL303 and Pl305
                            11 & 2.2 Ohms is very less can you check ENTRIP 1/2 it's connected to GND with 133k & 162K Résister make sure no leak & PQ307 pin 2/5 voltage check if PQ307 for any faulty

                            Comment

                            • String2016
                              Badcaps Legend
                              • Nov 2015
                              • 2230
                              • philippines

                              #15
                              Re: Asus k43u no power

                              I check pc305 is shorted beeping when i pulled it out same its beeping pc303 is not shorted, I cannot find same value on this cap on my scrapboard

                              Comment

                              • String2016
                                Badcaps Legend
                                • Nov 2015
                                • 2230
                                • philippines

                                #16
                                Re: Asus k43u no power

                                Problem solved!!! replacd PC305 laptop is now turns on and working fine @techtiger thank you for your help

                                Comment

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