HP DV6000 DA0AT6MB8E2 no power led flashes half second

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  • Dimitrios
    Senior Member
    • Nov 2013
    • 127
    • Greece
    #1

    HP DV6000 DA0AT6MB8E2 no power led flashes half second

    Hello, I have HP DV6000 DA0AT6MB8E2 Rev: E motherboard and experiencing a short 25Ω on 1.05V rail which is mostly MCH power voltage.
    Symptoms: As soon as I press power button led lights up and immediately closes and powers off.

    I have replaced nvidia GPU with a new one, reflowed MCH 945 but still same symptoms.

    Also removed PQ33, PC34 and PC33 (PC32 is already missing) but still that rail is shorted. What do you think? Should I replace Intel 945 MCH?
    Tags: None
    • dj_ricoh
      Badcaps Legend
      • Jan 2013
      • 2073
      • uk
      #2
      Re: HP DV6000 DA0AT6MB8E2 no power led flashes half second

      PQ30 out and PQ33 and remove PL23.
      do you still have short on the PQ pads?
      Just cook it! It's already broken.

        Comment

        • Dimitrios
          Senior Member
          • Nov 2013
          • 127
          • Greece
          #3
          Re: HP DV6000 DA0AT6MB8E2 no power led flashes half second

          I haven't removed PQ30 because on pins 5-8 there is 19V VIN so that line is correct. I haven't removed the coil PL23 yet, wouldn't that cut the circuit in half?
          . However I have already completely removed PQ33 but short remains.

            Comment

            • dj_ricoh
              Badcaps Legend
              • Jan 2013
              • 2073
              • uk
              #4
              Re: HP DV6000 DA0AT6MB8E2 no power led flashes half second

              you need to remove the coil to see if the short goes in the line.
              then you can check if the pq pads are ok.
              that max its ok? PU7
              Just cook it! It's already broken.

                Comment

                • Dimitrios
                  Senior Member
                  • Nov 2013
                  • 127
                  • Greece
                  #5
                  Re: HP DV6000 DA0AT6MB8E2 no power led flashes half second

                  You are right because +1.05V signal gets to some big 330UF caps near CPU and some small caps under CPU and also is the main power supply for MCH 945. I need to remove the coil to see if it stills has the line a shortage. And I will also check thoroughly PU7.

                    Comment

                    • dj_ricoh
                      Badcaps Legend
                      • Jan 2013
                      • 2073
                      • uk
                      #6
                      Re: HP DV6000 DA0AT6MB8E2 no power led flashes half second

                      the problem i don`t know and will really like to know what is the purpose for those pins.
                      like what each pin does
                      Just cook it! It's already broken.

                        Comment

                        • dj_ricoh
                          Badcaps Legend
                          • Jan 2013
                          • 2073
                          • uk
                          #7
                          Re: HP DV6000 DA0AT6MB8E2 no power led flashes half second

                          PU7. some i can see like VDD supply ,DL1 gate DH1
                          Just cook it! It's already broken.

                            Comment

                            • Dimitrios
                              Senior Member
                              • Nov 2013
                              • 127
                              • Greece
                              #8
                              Re: HP DV6000 DA0AT6MB8E2 no power led flashes half second

                              Removed coil PL23 and the short goes on the right side of the coil to PC34, PC33 etc.

                              PU7 MAX 8743EEI+ has (with coil removed):
                              VCC: 5V
                              VDD: 5V
                              V+: 19V
                              PGOOD: 0V (NOT grounded)
                              DH1: 1.9-3.3V Variable ? Gate of PQ30
                              DL1: 0V GND Gate of PQ33
                              LX1: 2.3V path to coil PL23 is not shorted now that it has been removed.

                                Comment

                                • Tiagho
                                  Member
                                  • Feb 2014
                                  • 10
                                  • Brazil
                                  #9
                                  Re: HP DV6000 DA0AT6MB8E2 no power led flashes half second

                                  I need this schematic please DA0AT6MB8E2

                                    Comment

                                    • drdyzio
                                      Senior Member
                                      • Apr 2014
                                      • 74
                                      • UK
                                      #10
                                      Re: HP DV6000 DA0AT6MB8E2 no power led flashes half second

                                      this might be it its all i could find
                                      Attached Files

                                        Comment

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