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Hp V6500 isue around charging circuit.

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    #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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    #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)?

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      #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.

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        #4
        Re: Hp V6500 isue around charging circuit.

        What's the resistance to ground on pin 10?

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          #5
          Re: Hp V6500 isue around charging circuit.

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

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            #6
            Re: Hp V6500 isue around charging circuit.

            Originally posted by khaahk View Post
            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

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              #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.

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                #8
                Re: Hp V6500 isue around charging circuit.

                What is the voltage on pin 2 of PD12?

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                  #9
                  Re: Hp V6500 isue around charging circuit.

                  Originally posted by atsio View Post
                  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.

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