Hp V6500 isue around charging circuit.

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  • Bisketti
    Badcaps Veteran
    • Oct 2013
    • 252
    • Ireland
    #1

    Hp V6500 isue around charging circuit.

    Hi folks any input on this is appreciated. I have a HP V6500 that has no sign of life. Its using the AT1 schematics (attached) , anyway on pins 5-8 of PQ30 Im getting 19v the gate is at 0V . PQ27 was damaged so it was replaced with same type.
    pin1 (DCin) on U5 has 19v however pin 10 (ACin) has 0v on one side of PR67 has 19v but 0v on the other side. PR67 and PR183 are a divider network so I presume I should be getting something here to indicate the adapter is present?.I checked both of these resistors and they are reading fine.
    I swapped out PU5 but still the same.PU5 pin 11 (ACOK) has 5v.


    Any help would be appreciated.
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    • Bisketti
      Badcaps Veteran
      • Oct 2013
      • 252
      • Ireland
      #2
      Re: Hp V6500 isue around charging circuit.

      I have a scrap at2 board thats similar and Im getting 3.85v on pin10 but on the other board I am getting 0v why would this resistor divider network not output? I have also changed both resistor and checked values and they are ok but still 0v to pin 10 PU5 (ACin)?

        Comment

        • khaahk
          Badcaps Veteran
          • Dec 2013
          • 763
          • Estonia
          #3
          Re: Hp V6500 isue around charging circuit.

          Resistance from ACIN to ground? Either you changed PU5 with another non-working one or you have something else on divider that eliminates the divider resistors... PC54 shorted? PQ57 ok?
          Last edited by khaahk; 05-01-2014, 01:25 PM.

            Comment

            • atsio
              Badcaps Veteran
              • Oct 2013
              • 819
              • Greece
              #4
              Re: Hp V6500 isue around charging circuit.

              What's the resistance to ground on pin 10?

                Comment

                • Bisketti
                  Badcaps Veteran
                  • Oct 2013
                  • 252
                  • Ireland
                  #5
                  Re: Hp V6500 isue around charging circuit.

                  Originally posted by atsio
                  What's the resistance to ground on pin 10?
                  Its reading as 17k

                    Comment

                    • Bisketti
                      Badcaps Veteran
                      • Oct 2013
                      • 252
                      • Ireland
                      #6
                      Re: Hp V6500 isue around charging circuit.

                      Originally posted by khaahk
                      Resistance from ACIN to ground? Either you changed PU5 with another non-working one or you have something else on divider that eliminates the divider resistors... PC54 shorted? PQ57 ok?
                      I had another dv board AT2 here with gpu missing its has the same charging Ic. I powered it up and it was getting 3.84v on pin 10, so I remove it and put it into the original AT1 board but still the same I also changed out PC54. Its really annoying because I havent found a component that was reading iffy. Im just basically swapping out components just to see.
                      PQ57 reads ok in circuit Im going to swap it out now

                        Comment

                        • Bisketti
                          Badcaps Veteran
                          • Oct 2013
                          • 252
                          • Ireland
                          #7
                          Re: Hp V6500 isue around charging circuit.

                          I removed PQ58 from circuit and voltage at pin 10 rose to 3.8v. Unit switches on when PQ58 is out of circuit. Tried a different Fet and laptop doesnt start.

                            Comment

                            • atsio
                              Badcaps Veteran
                              • Oct 2013
                              • 819
                              • Greece
                              #8
                              Re: Hp V6500 isue around charging circuit.

                              What is the voltage on pin 2 of PD12?

                                Comment

                                • Bisketti
                                  Badcaps Veteran
                                  • Oct 2013
                                  • 252
                                  • Ireland
                                  #9
                                  Re: Hp V6500 isue around charging circuit.

                                  Originally posted by atsio
                                  What is the voltage on pin 2 of PD12?
                                  I think its sorted now. There was 18.3v on both pin2 and 4 of Pq27 so I swapped it (Again PQ27) and PC88. The Pq27 I swapped it for was probably faulty.

                                    Comment

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