hp 650 laptop does not run on battery

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  • ut-norm
    Senior Member
    • Nov 2019
    • 67
    • italia
    #1

    hp 650 laptop does not run on battery

    Hello everyone. I have a problem with a HP 650 laptop that does not work with the battery. This inserted is recognized by the PC but despite being fully charged (it was charged with a similar laptop) the PC does not turn on, while it turns on regularly with the original power supply. When I unplug the power supply everything turns off. Yet the charge icon shows 100%. I have updated the bios to the latest f39 version. I do not know what to do. I have found a diagram on this forum. : p / n 010170100-600-g but not really of this card. The U0901 QZ8681LN charging chip on the schematic is present on the motherboard. I would like to understand how the battery is activated. Can anyone help me?
    Thanks for the reply
    Attached Files
    Last edited by SMDFlea; 03-10-2021, 07:51 AM.
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: hp laptop does not run on battery

      https://www.badcaps.net/forum/showthread.php?t=90356

      First thing is to try another battery. Then try another battery. Finally try another battery. 99% of battery problems are the battery itself, even "new", market is filled with garbage batteries. A "new" battery should come charged at around 50%, at worst between 20% and 80%, and the machine should turn on from it. Some batteries need to be "kickstarted" by plugging in the AC adapter for a short while to turn them on.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • SMDFlea
          Super Moderator
          • Jan 2018
          • 20745
          • UK
          #3
          Re: hp laptop does not run on battery

          With no power attached check Q0904 S/G/D
          All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

            Comment

            • ut-norm
              Senior Member
              • Nov 2019
              • 67
              • italia
              #4
              Re: hp laptop does not run on battery

              Ok thanks The first thing I did after having found the schematic is the replacement of the mosfet q0904 -4435- (which was good) with a 4423 which has the same characteristics, without obtaining any results.
              The battery I inserted is brand new HP -mu06-100% charged with another same notebook. Unfortunately it is not possible (for me) to measure the voltage across it.

                Comment

                • SMDFlea
                  Super Moderator
                  • Jan 2018
                  • 20745
                  • UK
                  #5
                  Re: hp laptop does not run on battery

                  Test D1004
                  All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                    Comment

                    • ut-norm
                      Senior Member
                      • Nov 2019
                      • 67
                      • italia
                      #6
                      Re: hp laptop does not run on battery

                      On the motherboard there is no d1004 nor the tps51123 chip.
                      51225 is present

                        Comment

                        • SMDFlea
                          Super Moderator
                          • Jan 2018
                          • 20745
                          • UK
                          #7
                          Re: hp laptop does not run on battery

                          Oz8681ln
                          Last edited by SMDFlea; 03-09-2021, 03:41 PM.
                          All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                            Comment

                            • mcplslg123
                              Badcaps Legend
                              • Jun 2015
                              • 7262
                              • india
                              #8
                              Re: hp laptop does not run on battery

                              Look carefully for some rusted or shorted cap on battery output track. Does the battery voltage reaches mb??What is the voltage readings on Q0904 with only battery attached??

                                Comment

                                • ut-norm
                                  Senior Member
                                  • Nov 2019
                                  • 67
                                  • italia
                                  #9
                                  Re: hp laptop does not run on battery

                                  On the contacts of the battery, which is fully charged, I do not detect any voltage. Connected to the motherboard I do not detect any voltage
                                  .The battery was recharged with a similar laptop and runs smoothly.

                                    Comment

                                    • mcplslg123
                                      Badcaps Legend
                                      • Jun 2015
                                      • 7262
                                      • india
                                      #10
                                      Re: hp laptop does not run on battery

                                      Check the resistance on battery + pin. Another method to try- put black probe on battery + terminal and red probe on battery - terminal and check readings(in diode mode). reverse the polarity and check again and note the readings.

                                        Comment

                                        • ut-norm
                                          Senior Member
                                          • Nov 2019
                                          • 67
                                          • italia
                                          #11
                                          Re: hp 650 laptop does not run on battery

                                          With the tester in diode mode and with the positive probe on the negative terminal of the battery I detect 2.7 volts, with the probe on the positive 0 volts

                                            Comment

                                            • mcplslg123
                                              Badcaps Legend
                                              • Jun 2015
                                              • 7262
                                              • india
                                              #12
                                              Re: hp 650 laptop does not run on battery

                                              Something is shorted for sure. You need to check each and every component on battery discharge circuit. Do you have Lab PSU??

                                                Comment

                                                • ut-norm
                                                  Senior Member
                                                  • Nov 2019
                                                  • 67
                                                  • italia
                                                  #13
                                                  Re: hp 650 laptop does not run on battery

                                                  Unfortunately, I don't have the original laptop schematic ...
                                                  I just have to check every single component of the psu ...

                                                    Comment

                                                    • mcplslg123
                                                      Badcaps Legend
                                                      • Jun 2015
                                                      • 7262
                                                      • india
                                                      #14
                                                      Re: hp 650 laptop does not run on battery

                                                      But, Do you have lab PSU??

                                                        Comment

                                                        • ut-norm
                                                          Senior Member
                                                          • Nov 2019
                                                          • 67
                                                          • italia
                                                          #15
                                                          Re: hp 650 laptop does not run on battery

                                                          Yes, what should I do?

                                                            Comment

                                                            • Antonynl
                                                              Senior Member
                                                              • Apr 2021
                                                              • 74
                                                              • Nederland
                                                              #16
                                                              Re: hp 650 laptop does not run on battery

                                                              Have you resolved this problem? I have a similar problem on a 450 g6.

                                                                Comment

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