Hp 440 g4 charging

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • motanya
    Senior Member
    • Nov 2021
    • 159
    • Kenya
    #1

    Hp 440 g4 charging

    Someone Help! I have an hp 440 g4 laptop, powers on with battery and adapter, works with either or both. If I connect the battery it does not show if charger is connected, if I remove the battery it shows charger is connected, I have changed charging ic and mosfets along the charging line but the behaviour is same, does anyone know how I can solve this?
    Attached Files
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13954
      • Canada
      #2
      Re: Hp 440 g4 charging

      Hi.

      1) be sure you are using a suitable power adapter for this laptop.

      2) attach the adapter & confirm the voltage to ground of ACDET pin #6 on the charger IC.
      Attached Files

        Comment

        • motanya
          Senior Member
          • Nov 2021
          • 159
          • Kenya
          #3
          Re: Hp 440 g4 charging

          Originally posted by mon2
          Hi.

          1) be sure you are using a suitable power adapter for this laptop.

          2) attach the adapter & confirm the voltage to ground of ACDET pin #6 on the charger IC.
          Thank you for your response. I have used the correct power adapter that works fine with another laptop of the same model. The voltage reading is 2.7v. Is it okay?

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13954
              • Canada
              #4
              Re: Hp 440 g4 charging

              ACDET is ok.

              What is the voltage to ground of the ACDRV pin? You can measure at pin #4 of the 2*DCin mosfets.

              This voltage must be ~25v to enable the mosfets.

              Often, the 2nd DCin mosfet gets damaged.

                Comment

                • motanya
                  Senior Member
                  • Nov 2021
                  • 159
                  • Kenya
                  #5
                  Re: Hp 440 g4 charging

                  Originally posted by mon2
                  ACDET is ok.

                  What is the voltage to ground of the ACDRV pin? You can measure at pin #4 of the 2*DCin mosfets.

                  This voltage must be ~25v to enable the mosfets.

                  Often, the 2nd DCin mosfet gets damaged.
                  Interestingly enough the voltage is 25

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13954
                      • Canada
                      #6
                      Re: Hp 440 g4 charging

                      With only the battery connected (no power adapter), what is the voltage to ground at the ACDRV pin?

                        Comment

                        • motanya
                          Senior Member
                          • Nov 2021
                          • 159
                          • Kenya
                          #7
                          Re: Hp 440 g4 charging

                          Originally posted by mon2
                          with only the battery connected (no power adapter), what is the voltage to ground at the acdrv pin?
                          0v

                            Comment

                            • mon2
                              Badcaps Legend
                              • Dec 2019
                              • 13954
                              • Canada
                              #8
                              Re: Hp 440 g4 charging

                              That is correct for this case - since only the battery is used to power the logic board.

                              Remove all power. Meter in resistance mode.

                              Check the resistance across the DCin mosfets to see if they are leaking.

                              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. If the resistance check is low, the mosfet is leaking and must be replaced.

                              One meter probe to one pin to measure; other meter probe to other pin to measure. Also post the meter scale used for the check.

                                Comment

                                Previous template Next

                                Related Topics

                                Collapse
                                • flat-earther
                                  ASUS X54H laptop thinks it's always charging even with charger unplugged
                                  by flat-earther
                                  The charging indicator light on my ASUS X54H laptop is always on even when the charger is disconnected.

                                  Windows also shows ''Plugged in'' when charger is not connected.

                                  This problem started year ago gradually, when unplugging the charger the charging light took several seconds to disappear, then minutes, and now almost always on even when unplugged for an entire day.
                                  Strangely, before sometimes immediately when plugging in the charger the charging light went away, and later came back with it connected.
                                  If I let battery run out and say it has 3% Windows will...
                                  06-24-2025, 09:32 AM
                                • Thomasraud
                                  Dell Vostro 3550 (v A01 with BQ24707) Plugged in, Not Charging
                                  by Thomasraud
                                  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
                                • master_haze86
                                  820-01958-A no power sys led = white when charger is connected.
                                  by master_haze86
                                  Hi everyone.

                                  First, let me preface by saying that I do not have much experience with diagnosing damages in motherboards other than visual inspection and checking simple short to ground faults.
                                  But I do learn quickly, and really want to learn how to properly diagnose motherboard faults. If someone could have the patience to go over this board with me, it would be greatly appreciated.

                                  A customer came into my shop with a A2179 MacBook with an 820-01958-A logic board. The reason for bringing the laptop in is that the laptop stopped turning on.

                                  First thing...
                                  02-15-2024, 05:30 PM
                                • Scoff
                                  HP Probook 470 G4 - Power and Charging Problem
                                  by Scoff
                                  Looking for some help with this one if anybody can assist please? I have an HP Probook 470 G4 Laptop which recently started to intermittently failing to turn on, with intermittent white LED light(charging LED) by the charging port when it should have been charging and showing an orange LED instead. Definitely some sort of gradual failure. Now the laptop fails to power on at all, no charging LED, no Power Button LED either - seemingly dead.
                                  Stripped down to the bare motherboard. The original HP battery, when disconnected from the motherboard, is reading 0.00v - possibly some sort of protection...
                                  07-03-2023, 09:28 AM
                                • obelix24
                                  A1398 - 820-3663-A - not charging
                                  by obelix24
                                  I got macbook pro A1398 15" from my friend. He told me that he changed battery and macbook stopped charging.

                                  Boardnumber : 820-3662-A

                                  I've checked and when i connect charger it's recognized by MacOS but there is no light on charger and it's not charging battery (i've tried multiple chargers still the same behaviour), i've also tried 3 different magsafe ports.

                                  I've check U7100 and replaced it multiple times (from other donor boards that i have) (i've tried probably 7 different U7100) - i've also checked current resistors around this ISL (R7151, R7152,...
                                  05-05-2025, 12:53 PM
                                • Loading...
                                • No more items.
                                Working...