Charging IC BQ25A troubleshooting help

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  • IamPritesh
    Badcaps Veteran
    • Aug 2017
    • 356
    • India
    #1

    Charging IC BQ25A troubleshooting help

    I have this HP 15-BS525UR,LA-E791P REV 2.0 laptop that has charging issue. Sometimes the battery is detected , other times it does not. And if it gets detected it does increase the charge percentage. While at times, it just works fine ( which is rare )

    The schematic for this is not available which is making it ore difficult for me to trace the issue.

    The charging IC used in this board is BQ25A , whose datasheet is available.
    Also the battery connector has 2.5volt on pin 1 when I plug in the AC adapter without the battery.
    If I connect the battery to the terminal, PIN 1 shows 12 volt.

    Thank you all of you.
    Tags: None
    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #2
      Re: Charging IC BQ25A troubleshooting help

      Post measurements of charging ic here. Then only one can think about it.

        Comment

        • IamPritesh
          Badcaps Veteran
          • Aug 2017
          • 356
          • India
          #3
          Re: Charging IC BQ25A troubleshooting help

          Originally posted by mcplslg123
          Post measurements of charging ic here. Then only one can think about it.
          Thanks I will do that in few minutes.. but just wanted to know what should be the "ideal" voltage on the Positive pin of the battery connector with AC plugged in and NO battery is connected ?

            Comment

            • luckydip
              Senior Member
              • Aug 2016
              • 159
              • uk
              #4
              Re: Charging IC BQ25A troubleshooting help

              Pin 1 voltage maybe ok. Have you tried another good working battery to rule out a battery problem?

                Comment

                • IamPritesh
                  Badcaps Veteran
                  • Aug 2017
                  • 356
                  • India
                  #5
                  Re: Charging IC BQ25A troubleshooting help

                  Originally posted by luckydip
                  Pin 1 voltage maybe ok. Have you tried another good working battery to rule out a battery problem?
                  Yeah checked with known good battery. Charging issue still not resolved

                    Comment

                    • luckydip
                      Senior Member
                      • Aug 2016
                      • 159
                      • uk
                      #6
                      Re: Charging IC BQ25A troubleshooting help

                      Not 100% familiar with this chip but there should be current sense resistors so the chip knows when to use the adaptor/battery. Measure resistance between pin1&2 and pin12&13. In macbooks this sort of issue would either be a current sense circuit/ISL chip or the SMC as it displays the battery status/charge % etc. Would the equivalent to the SMC be the super IO?
                      Last edited by luckydip; 09-30-2019, 07:41 AM.

                        Comment

                        • IamPritesh
                          Badcaps Veteran
                          • Aug 2017
                          • 356
                          • India
                          #7
                          Re: Charging IC BQ25A troubleshooting help

                          Removed the Charging IC and placed the same one back and now the laptop is charging fine.

                          However I see the CapsLock "LIGHT" is always ON. The keyboard works fine though. I am not sure what could have caused that.

                            Comment

                            • mcplslg123
                              Badcaps Legend
                              • Jun 2015
                              • 7262
                              • india
                              #8
                              Re: Charging IC BQ25A troubleshooting help

                              Originally posted by IamPritesh
                              Removed the Charging IC and placed the same one back and now the laptop is charging fine.

                              However I see the CapsLock "LIGHT" is always ON. The keyboard works fine though. I am not sure what could have caused that.
                              if it was a cracked solder joint, then issue is resolved but if was due to a resistor or the ic itself, it will come back again with same complaint-so keep your fingers crossed for a couple of days.

                                Comment

                                • IamPritesh
                                  Badcaps Veteran
                                  • Aug 2017
                                  • 356
                                  • India
                                  #9
                                  Re: Charging IC BQ25A troubleshooting help

                                  Originally posted by mcplslg123
                                  if it was a cracked solder joint, then issue is resolved but if was due to a resistor or the ic itself, it will come back again with same complaint-so keep your fingers crossed for a couple of days.
                                  Yes this has happened to me. I am not sure, how applying heat makes it to work and then in few days the same fault is witnessed again. What's the logic ?

                                    Comment

                                    • jasko_jacker
                                      Badcaps Legend
                                      • Oct 2014
                                      • 1137
                                      • italy
                                      #10
                                      Re: Charging IC BQ25A troubleshooting help

                                      The heat restores some internal connections which then detach quickly

                                        Comment

                                        • vitaliy415
                                          Member
                                          • Feb 2017
                                          • 12
                                          • Ukraine
                                          #11
                                          Re: Charging IC BQ25A troubleshooting help

                                          who found the cause of this problem?
                                          similar motherboard and problem

                                            Comment

                                            • tecnicojr
                                              New Member
                                              • May 2022
                                              • 0
                                              • nueva loja
                                              #12
                                              Re: Charging IC BQ25A troubleshooting help

                                              Originally posted by vitaliy415
                                              who found the cause of this problem?
                                              Similar motherboard and problem
                                              i have

                                                Comment

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                                                  Hello,


                                                  i have similar problem as https://www.badcaps.net/forum/showthread.php?t=37828
                                                  QUOTED
                                                  -It works on charger (without battery connected-only charger)
                                                  -It works on battery (without charger connected-only battery)
                                                  -& it also works when plugged in battery & charger, but it's not charging the battery
                                                  //Confirming, i have same issue, but problem started from charger, centre PIN is outputing 10V+ and jumping randomly 19V


                                                  and..


                                                  QUOTE
                                                  The IC cannot maintain the input current level                                                  ...
                                                  06-28-2022, 06:47 PM
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