compaq can power on batttery but not by charger

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  • sasser
    Badcaps Veteran
    • Dec 2012
    • 364
    • Malaysia

    #1

    compaq can power on batttery but not by charger

    hye need forumer help. i got 1 compaq v3000 intel model. when power on with battery the display come. but when pull out the battery and put adapter charger laptop can power on but no display. anyone had face with this problem too? already chekck u4 mosfet and u10 mosfet. pin 123 got 19v but pin 5678 no volt.
  • alihomee
    Badcaps Legend
    • Dec 2012
    • 1565
    • malaysia

    #2
    Re: compaq can power on batttery but not by charger

    see for charger ic

    Comment

    • sasser
      Badcaps Veteran
      • Dec 2012
      • 364
      • Malaysia

      #3
      Re: compaq can power on batttery but not by charger

      use maxim 8725e. i check voltage at pin 95v 10,11,12,13 no volt

      Comment

      • dj_ricoh
        Badcaps Legend
        • Jan 2013
        • 2073
        • uk

        #4
        Re: compaq can power on batttery but not by charger

        you need to focus on PIN 1 , 3 and 6
        post results from those pins
        Just cook it! It's already broken.

        Comment

        • sasser
          Badcaps Veteran
          • Dec 2012
          • 364
          • Malaysia

          #5
          Re: compaq can power on batttery but not by charger

          ok i will post results here Thanks dj . As i know from dj _ricoh said pin 1 for ACIN pin 3 for DCIN and pin 6 for ACOK. ACIN and DCIN from adapter input . and ACOK from LDO,what means LDO ? and . what are connection do here with display ? seem like shorted cap in that area ?when put adapter no display but ok with battery.

          Comment

          • dj_ricoh
            Badcaps Legend
            • Jan 2013
            • 2073
            • uk

            #6
            Re: compaq can power on batttery but not by charger

            post the result here
            Just cook it! It's already broken.

            Comment

            • dj_ricoh
              Badcaps Legend
              • Jan 2013
              • 2073
              • uk

              #7
              Re: compaq can power on batttery but not by charger

              LDO provide 3.3V for the chip it self in order to set REF voltage and gives voltage to mosfet that charge the battery.
              results first so we can see what is going on
              Just cook it! It's already broken.

              Comment

              • sasser
                Badcaps Veteran
                • Dec 2012
                • 364
                • Malaysia

                #8
                Re: compaq can power on batttery but not by charger

                i got 19.12v on pin1 , 3.08 on pin 3 and 3.27v on pin 6. when power on state pin1 drop to 18.77v , 3.08 on pin3 then 3.27v on pin 6.

                more info i measure volt on U4 mosfet pin 5678 no volt but present volt on gate , 1,2,3 all got 19v.

                u10 also same volt as U4 no volt on source.

                put battery+adapter back also got same reading.

                Comment

                • dj_ricoh
                  Badcaps Legend
                  • Jan 2013
                  • 2073
                  • uk

                  #9
                  Re: compaq can power on batttery but not by charger

                  i hope you get it.
                  IF PIN 3 ACIN its 3.3v over 1.5V , ACOK needs to be Low,
                  ACOK its high when there is no ACIN.
                  get it?
                  if ACIN High and ACOK high the max its FUBAR.
                  Attached Files
                  Just cook it! It's already broken.

                  Comment

                  • sasser
                    Badcaps Veteran
                    • Dec 2012
                    • 364
                    • Malaysia

                    #10
                    Re: compaq can power on batttery but not by charger

                    so solutions is need replace with the new one ?

                    Comment

                    • dj_ricoh
                      Badcaps Legend
                      • Jan 2013
                      • 2073
                      • uk

                      #11
                      Re: compaq can power on batttery but not by charger

                      yee
                      Just cook it! It's already broken.

                      Comment

                      • sasser
                        Badcaps Veteran
                        • Dec 2012
                        • 364
                        • Malaysia

                        #12
                        Re: compaq can power on batttery but not by charger

                        already replace but still the same. all volt also same

                        Comment

                        • dj_ricoh
                          Badcaps Legend
                          • Jan 2013
                          • 2073
                          • uk

                          #13
                          Re: compaq can power on batttery but not by charger

                          same voltage?
                          Just cook it! It's already broken.

                          Comment

                          • sasser
                            Badcaps Veteran
                            • Dec 2012
                            • 364
                            • Malaysia

                            #14
                            Re: compaq can power on batttery but not by charger

                            yes pin1 i 19.12v 3.08 on pin 3 and 3.27v on pin 6. on psu read current in 0.7200.

                            Comment

                            • dj_ricoh
                              Badcaps Legend
                              • Jan 2013
                              • 2073
                              • uk

                              #15
                              Re: compaq can power on batttery but not by charger

                              pfff
                              insert the bat in and check the pins from the battery(socket)
                              Just cook it! It's already broken.

                              Comment

                              • sasser
                                Badcaps Veteran
                                • Dec 2012
                                • 364
                                • Malaysia

                                #16
                                Re: compaq can power on batttery but not by charger

                                bat pin pin1 11.4v pin2 3.23 v pin 3 3.23v the rest no volt. the i check maxim chip not voltage at pin1 pin3 and pin6

                                Comment

                                • sasser
                                  Badcaps Veteran
                                  • Dec 2012
                                  • 364
                                  • Malaysia

                                  #17
                                  Re: compaq can power on batttery but not by charger

                                  current measured only 0.7200A when adapter plug in with laptop power on. this not normal reading.

                                  Comment

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