Asus G712L laptop does not charge, does turn on with battery.

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  • SarcasticOP
    Wildly Mediocre
    • Oct 2023
    • 33
    • United States

    #1

    Asus G712L laptop does not charge, does turn on with battery.

    I have a laptop that does not charge, but will turn on, so I believe this is in the charging circuit. I see not heat under thermal camera so no obvious shorts that are easily detectable from that. I am not too familiar with schematics and how to read them.

    I know it is taking 20v in at the barrel jack connector, but since I am not familiar with this motherboard, not too sure how to follow power rails to nail down the problem.

    Sorry I cannot provide more info, but I can answer questions if you have any.

    Board: G532LWS Rev 1.3

    Boadview and Schematic
  • Answer selected by SarcasticOP at Yesterday, 03:45 PM.
    SarcasticOP
    Wildly Mediocre
    • Oct 2023
    • 33
    • United States

    Originally posted by Sephir0th

    It should be somehow possible to test whether the jack is broken inside before making the next step ordering a replacement jack. When it isn't at fault, you will make a long face...
    And even at this point it is somewhat hard to believe for me that this massive Jack has failed like that without obvious signs.
    Hey, I got really sick so sorry for the late reply. I did go ahead and swap out the charging port and it did resolve the issue. Not sure why, but it works now! Thanks for all of the help, I really appreciate you!

    Comment

    • Sephir0th
      Badcaps Legend
      • Oct 2020
      • 1250
      • Germany

      #2
      Picture of the area with the DC-IN Mosfets and of the charging controller including surrounding circuit please.

      Or are you able to find and measure everything on the base of the designations in the schematics?
      FairRepair on YouTube

      Comment

      • SarcasticOP
        Wildly Mediocre
        • Oct 2023
        • 33
        • United States

        #3
        Originally posted by Sephir0th
        Picture of the area with the DC-IN Mosfets and of the charging controller including surrounding circuit please.
        Click image for larger version

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        Originally posted by Sephir0th
        Or are you able to find and measure everything on the base of the designations in the schematics?
        Not super strong with reading schematics, I get lost pretty quickly.
        Attached Files

        Comment

        • Sephir0th
          Badcaps Legend
          • Oct 2020
          • 1250
          • Germany

          #4
          Then picture of the charging controller and surrounding circuit too please. Should be a BQ24780S iirc.

          Edit: And resistance between these two points please (Source and Gate) to start with.
          Attached Files
          Last edited by Sephir0th; 06-06-2025, 12:25 PM.
          FairRepair on YouTube

          Comment

          • SarcasticOP
            Wildly Mediocre
            • Oct 2023
            • 33
            • United States

            #5
            Originally posted by Sephir0th
            Then picture of the charging controller and surrounding circuit too please. Should be a BQ24780S iirc.
            Click image for larger version

Name:	Screenshot 2025-06-06 15-22-49.png
Views:	36
Size:	3.71 MB
ID:	3653745

            Originally posted by Sephir0th
            Edit: And resistance between these two points please (Source and Gate) to start with.
            2.176Mohms

            Comment

            • Sephir0th
              Badcaps Legend
              • Oct 2020
              • 1250
              • Germany

              #6
              So the DC-IN Mosfets are most likely fine.

              Plug the charger and measure voltage at the following 4 points: ACDET, VCC, REGN and ACDRV. Pay attention to not slip with the probes.
              Attached Files
              FairRepair on YouTube

              Comment

              • SarcasticOP
                Wildly Mediocre
                • Oct 2023
                • 33
                • United States

                #7
                Originally posted by Sephir0th
                So the DC-IN Mosfets are most likely fine.

                Plug the charger and measure voltage at the following 4 points: ACDET, VCC, REGN and ACDRV. Pay attention to not slip with the probes.
                All are showing 0v, everyone other than 3 is showing OL in diode mode.

                Comment

                • Sephir0th
                  Badcaps Legend
                  • Oct 2020
                  • 1250
                  • Germany

                  #8
                  Originally posted by SarcasticOP

                  All are showing 0v, everyone other than 3 is showing OL in diode mode.
                  If the charger was plugged as advised then there is something wrong at the very beginning of the power path.

                  Measure voltage and resistance to GND of these two points please. Resistance to GND measurements always without power.

                  Is the charger known good, of correct voltage and current?
                  Attached Files
                  FairRepair on YouTube

                  Comment

                  • SarcasticOP
                    Wildly Mediocre
                    • Oct 2023
                    • 33
                    • United States

                    #9
                    Originally posted by Sephir0th
                    If the charger was plugged as advised then there is something wrong at the very beginning of the power path.

                    Measure voltage and resistance to GND of these two points please. Resistance to GND measurements always without power.
                    Both sides are reading 1.715 in diode mode, no voltage on either side. It is plugged in and can verify 20v at barrel jack.

                    Originally posted by Sephir0th
                    Is the charger known good, of correct voltage and current?
                    Yes, known good. I have two chargers that both work on my laptop.

                    EDIT: Test points start at 4.7Mohms and drop down to 0, and then the process resets.

                    The R005 resistor below the leftmost mosfet does have continuity from side to side.

                    Comment

                    • Sephir0th
                      Badcaps Legend
                      • Oct 2020
                      • 1250
                      • Germany

                      #10
                      Originally posted by SarcasticOP

                      Both sides are reading 1.715 in diode mode, no voltage on either side. It is plugged in and can verify 20v at barrel jack.

                      When I say "resistance" or "resistance to GND" then you are supposed to take measurements in Ohms mode please. Not diode mode. Next time please.

                      You are saying there isn't voltage at any side of theae inductors when charger is plugged? Confirm please!
                      FairRepair on YouTube

                      Comment

                      • SarcasticOP
                        Wildly Mediocre
                        • Oct 2023
                        • 33
                        • United States

                        #11
                        Originally posted by Sephir0th

                        When I say "resistance" or "resistance to GND" then you are supposed to take measurements in Ohms mode please. Not diode mode. Next time please.
                        Sorry about that, I added it into the edit afterward, I normally work in diode mode, so that is what I defaulted to.

                        Originally posted by Sephir0th
                        You are saying there isn't voltage at any side of theae inductors when charger is plugged? Confirm please!
                        No voltage at all. I can send a picture to confirm if you would like.

                        Comment

                        • Sephir0th
                          Badcaps Legend
                          • Oct 2020
                          • 1250
                          • Germany

                          #12
                          Originally posted by SarcasticOP
                          Sorry about that, I added it into the edit afterward, I normally work in diode mode, so that is what I defaulted to.


                          No voltage at all. I can send a picture to confirm if you would like.
                          Using diode mode for resistance measurements is bad practice, since each multimeter works with a different test current which will result in different values who are not really comparable anymore. When you work with me, we will always work in Ohms mode, even if it is a MacBook...

                          However, when you say, the charger is working, then the DC-IN Jack must be faulty (Broken/Loose Pins/something else)

                          You are absolutely sure about that? Double-checked your GND, etc.?
                          FairRepair on YouTube

                          Comment

                          • SarcasticOP
                            Wildly Mediocre
                            • Oct 2023
                            • 33
                            • United States

                            #13
                            Originally posted by Sephir0th

                            Using diode mode for resistance measurements is bad practice, since each multimeter works with a different test current which will result in different values who are not really comparable anymore. When you work with me, we will always work in Ohms mode, even if it is a MacBook...

                            However, when you say, the charger is working, then the DC-IN Jack must be faulty (Broken/Loose Pins/something else)

                            You are absolutely sure about that? Double-checked your GND, etc.?
                            I will order and replace the DC-IN jack and we can go from there. I think that is the best case scenario

                            Comment

                            • SarcasticOP
                              Wildly Mediocre
                              • Oct 2023
                              • 33
                              • United States

                              #14
                              Thank you for your help btw, I hope I can get this good some day ha ha

                              Comment

                              • Sephir0th
                                Badcaps Legend
                                • Oct 2020
                                • 1250
                                • Germany

                                #15
                                Originally posted by SarcasticOP

                                I will order and replace the DC-IN jack and we can go from there. I think that is the best case scenario
                                It should be somehow possible to test whether the jack is broken inside before making the next step ordering a replacement jack. When it isn't at fault, you will make a long face...
                                And even at this point it is somewhat hard to believe for me that this massive Jack has failed like that without obvious signs.
                                FairRepair on YouTube

                                Comment

                                • SarcasticOP
                                  Wildly Mediocre
                                  • Oct 2023
                                  • 33
                                  • United States

                                  #16
                                  Originally posted by Sephir0th

                                  It should be somehow possible to test whether the jack is broken inside before making the next step ordering a replacement jack. When it isn't at fault, you will make a long face...
                                  And even at this point it is somewhat hard to believe for me that this massive Jack has failed like that without obvious signs.
                                  I will do some probing around today or tomorrow, once I am done with everything that came in over the weekend while I was off work. I will let you know if I find anything else.

                                  Comment

                                  • SarcasticOP
                                    Wildly Mediocre
                                    • Oct 2023
                                    • 33
                                    • United States

                                    #17
                                    Originally posted by Sephir0th

                                    It should be somehow possible to test whether the jack is broken inside before making the next step ordering a replacement jack. When it isn't at fault, you will make a long face...
                                    And even at this point it is somewhat hard to believe for me that this massive Jack has failed like that without obvious signs.
                                    Hey, I got really sick so sorry for the late reply. I did go ahead and swap out the charging port and it did resolve the issue. Not sure why, but it works now! Thanks for all of the help, I really appreciate you!

                                    Comment

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