HP 8440P strange problem

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  • sonunigam
    Senior Member
    • Aug 2013
    • 151
    • Pakistan
    #1

    HP 8440P strange problem

    Hello all guys,
    I'm checking an Elitebook 8440P which is not turning on but the charging light blinking with blue and orange when i connect the charger.
    I thought that it is the problem bad controller so i replaced with new one KBC1098NU. But same, So i changed TPS 51125 and BQ 24740 but all is vain.
    When i closely look the voltages on PQ101 Pin Numbers 5,6,7,8 and there are no voltages. But on a working Motherboard there are 19 Volts here. Again when i check PQ 101 Pin # 4, There are 19 Volts but when i check on a working Motherboard there are 8.65 Volts.
    Anybody can tell me what should i do?
    Attached Files
    Last edited by sonunigam; 08-15-2015, 05:15 AM. Reason: wrong attachment
    Tags: None
    • sonunigam
      Senior Member
      • Aug 2013
      • 151
      • Pakistan
      #2
      Re: HP 8440P strange problem

      Hey all,
      There's nobody who can tell me what is the fault? or guide me how to check the problem?
      Amazing! Is this a forum for Professionals?????

        Comment

        • dj_ricoh
          Badcaps Legend
          • Jan 2013
          • 2073
          • uk
          #3
          Re: HP 8440P strange problem

          Originally posted by sonunigam
          Hey all,
          There's nobody who can tell me what is the fault? or guide me how to check the problem?
          Amazing! Is this a forum for Professionals?????
          YES! this is for PRO!
          you know why i know that?

          1. all the pro techs they got a life you know? SUNDAY!
          2. they all got jobs(some of them related with the theme of the website.
          3. PRO techs don`t bother to reply when you ask for help like that!

          and where are the photos of the board? full model mobo and where is the schematic you print screen it?
          Just cook it! It's already broken.

            Comment

            • sonunigam
              Senior Member
              • Aug 2013
              • 151
              • Pakistan
              #4
              Re: HP 8440P strange problem

              Okay dear, Thanks for correction. Now, i'm gonna send you the schematic diagram. . .
              This is HP Elitebook 8440P.
              Attached Files

                Comment

                • sonunigam
                  Senior Member
                  • Aug 2013
                  • 151
                  • Pakistan
                  #5
                  Re: HP 8440P strange problem

                  Hey all,
                  Any professional have some moments for me. . . I'm stuck in HP 8440P, Please help me out. . . . Pleaseeeeeeeeeeeeeeeeeeeeeeeeee

                    Comment

                    • dj_ricoh
                      Badcaps Legend
                      • Jan 2013
                      • 2073
                      • uk
                      #6
                      Re: HP 8440P strange problem

                      Take out pc101 and pr101 and test them.
                      One of them is shorted or leaking. Thats why you got 19v.

                      You can take them out connect charger and inject voltage on pin 4 with 8v like you got on working motherboard
                      Just cook it! It's already broken.

                        Comment

                        • sonunigam
                          Senior Member
                          • Aug 2013
                          • 151
                          • Pakistan
                          #7
                          Re: HP 8440P strange problem

                          I already checked PC101 and PR101, I checked them with multi-meter. PR101 shows 199.4 Kohms and with capacitor or without capacitor same situation. No change. . .

                            Comment

                            • dj_ricoh
                              Badcaps Legend
                              • Jan 2013
                              • 2073
                              • uk
                              #8
                              Re: HP 8440P strange problem

                              pr111 its ok?
                              Just cook it! It's already broken.

                                Comment

                                • sonunigam
                                  Senior Member
                                  • Aug 2013
                                  • 151
                                  • Pakistan
                                  #9
                                  Re: HP 8440P strange problem

                                  Yes dear,
                                  This is okay. . .

                                    Comment

                                    • dj_ricoh
                                      Badcaps Legend
                                      • Jan 2013
                                      • 2073
                                      • uk
                                      #10
                                      Re: HP 8440P strange problem

                                      Take that pq101 and do a diode test on it.

                                      After find out where that 19v its coming.

                                      You got a resitor pr101 and a cap pc101 coming from adapter
                                      And a resistor from KBC pr111
                                      Eder way you got 4 options here 2 resistors one cap or the fet internal shot and leaking to gate.
                                      Just cook it! It's already broken.

                                        Comment

                                        • Speedzion
                                          New Member
                                          • Apr 2019
                                          • 1
                                          • Nigeria
                                          #11
                                          Re: HP 8440P strange problem

                                          Thanks dear

                                            Comment

                                            • ktmmotocross
                                              Boardkiller
                                              • Feb 2014
                                              • 3570
                                              • slovakia
                                              #12
                                              Re: HP 8440P strange problem

                                              on gate of first mosfet u must have lover voltages than 19V because it is P-channel mosfet. ADP_EN# must be grounded to have that lower woltage so both gates of PQ1007 must have positive signals

                                              u cannot see that easy thing?
                                              Last edited by ktmmotocross; 04-23-2019, 03:46 PM.

                                                Comment

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