HP laptop does not charge the battery, the light turns amber and then changes to white.

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  • stevenallauca
    New Member
    • Sep 2024
    • 5
    • Ecuador
    #1

    HP laptop does not charge the battery, the light turns amber and then changes to white.

    Hello everyone. I have a problem with an HP laptop, when connecting the charger the amber light comes on for 6 seconds, changes to white and does not charge, I have checked all the components with the multimeter and the values seem correct, I was guided by the diagram, I do not know if it is a problem with the BQ24728H charge controller, investigating it seems that the voltages given by the charge controller are correct, I made the measurements connected to the power source and without the battery:
    - ACN (BQACN) 19.6v
    - ACP (BQACP) 19.6v
    - CMSRC (BQCMSRC) 19.6v
    - ACDRV (BQACDRV) 26v
    - ACPRES (ACIN) 3v
    - ACDET 3v
    - IOUT (BQIOUT) 0v
    - SDA (BQDATA) 3.6v
    - SCL (BQCLK) 3.6v
    - ILIM 1v
    - BATDRV (BQBATDRV) 3v
    - SRN (BQSRN) 3v
    - SRP (BQSRP) 3v
    - GND 0v
    - LODRV (BQLODRV) 0v
    - REGN (REGN6V) 6v
    - BTST 6v
    - HIDRV (BQHIDRV) 3v
    - PHASE (BQPHASE) 3v
    - VCC (BQVCC) 19.6v

    The battery is healthy, I even tried with a new battery.
    If someone can help me by telling me which are the important components for charging and I can check them again, if possible to know the voltage that must cross in a healthy charging system without problems. Attached schematic is page 27.

    https://www.badcaps.net/forum/troubl...atic-boardview
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13840
      • Canada
      #2
      Review the sticky above by piernov on charger circuits.

      Each mosfet in the power path is a suspect. The battery srn/srp should not be at 3v. Something is wrong here. Too many 3v.

      Remove all power. Meter in resistance mode. Test the resistance across each mosfet:

      source (1-2-3) & drain (5-6-7-8)
      source (1-2-3) & gate (4)
      gate (4) & drain (5-6-7-8)

      Post each measurement. Test the usual dc-in mosfets and also the battery charger mosfets.

        Comment

        • stevenallauca
          New Member
          • Sep 2024
          • 5
          • Ecuador
          #3
          Hi, thank you very much for your reply, the error was pq13, I replaced it and now it charges.
          But now I have the beep problem, it gives me 2 short beeps in 5 series, can you tell me what is the cause?
          I did some research but I can't find any information.
          Thank you for your help.​

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13840
              • Canada
              #4
              May be defective ram.

              https://h30434.www3.hp.com/t5/Notebo...0the%20modules.

                Comment

                • stevenallauca
                  New Member
                  • Sep 2024
                  • 5
                  • Ecuador
                  #5
                  Hello, I have already changed the RAM but the problem continues, it does not give an image to the screen.
                  The sound is 2 short beeps (sb) with 3 seconds, it does it like this:
                  2 (sb) - 3 sec - 2 (sb) - 3 sec - 2 (sb) - 3 sec - 2 (sb) - 3 sec - 2 (sb)
                  After this it does not beep anymore. The Caps Lock light stays on with 2 short blinks every 3 seconds, it does this indefinitely, the fan also stays on only until I remove the power from the power supply.
                  I tested what happens if I turn it on without RAM, the beep is 3 short times.
                  I also tested putting in a new CR2032 battery.
                  I don't know if it has anything to do with changing the mosfet, but I doubt it. The change I made was from a 6414A to a 6428. I couldn't find the 6414A, but I investigated the 6428 and it could be adapted to the 6414A work system. I changed it and it works without any problem regarding charging.​

                    Comment

                    • mcplslg123
                      Badcaps Legend
                      • Jun 2015
                      • 7262
                      • india
                      #6
                      Give us the voltage on all coils after pressing power switch. There may be a missing rail.
                      Observe the mb under microscope/magnifier for corrossion etc.

                        Comment

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