TUF505DT : No charge

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  • kurtspirit
    Senior Member
    • Feb 2019
    • 112
    • France

    #1

    TUF505DT : No charge

    Good morning,

    I currently have an Asus TUF505DT PC that refuses to charge the batteries.
    I have 3 different batteries, two of which come from Asus Accessories and are official, but nothing works.

    The PC starts fine on mains or on battery.

    If I connect the charger, the battery remains at its level but does not charge.
    So I searched and finally found the battery management component which seems to be: bq24780S .

    I changed this famous component without more result. I don't understand where the problem could come from...
    Do you have any leads please?

    Thank you.
    Good day
  • mcplslg123
    Badcaps Legend
    • Jun 2015
    • 7262
    • india

    #2
    Re: TUF505DT : No charge

    Measure below mentioned pins of BQ247780s charging IC:
    01.ACP
    02.ACN
    03.CMSRC
    04.ACDRV
    05ACOK
    06.ACDET
    07.VCC
    08.REGN

    Measure voltage on pin1/4/8 of dc-in mosfets(there will be two mosfets).

    Comment

    • kurtspirit
      Senior Member
      • Feb 2019
      • 112
      • France

      #3
      Re: TUF505DT : No charge

      Hi,

      Thank you.

      Here are the measures :

      01.ACP 19.41V
      02.ACN 20.23V
      03.CMSRC 20.02V
      04.ACDRV 25.30V
      05ACOK 3.141V
      06.ACDET 2.741V
      07.VCC 3.197V
      08.REGN 0.015V

      The mosfet seems to have 10V approx on 1 and 0 on 4 and 8.

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 14085
        • Canada

        #4
        Re: TUF505DT : No charge

        Confirm the voltage on the VCC pin. Confirm it is truly the VCC pin on this device.

        The VCC value is too low. Often there will be 3 pin dual diode that powers the VCC pin.

        Search for it and then check the voltage to ground of each pin on this diode.

        Suspecting that the diode is defective. This is resulting in the wrong voltage for REGN and ACDRV pins.

        Update...think you are checking a different pin. ACDRV is ok. REGN pin should be 6v since ACDRV is ok.

        Comment

        • kurtspirit
          Senior Member
          • Feb 2019
          • 112
          • France

          #5
          Re: TUF505DT : No charge

          It's possible. I'll check the datasheet to confirm values. Thank

          Comment

          • kurtspirit
            Senior Member
            • Feb 2019
            • 112
            • France

            #6
            Re: TUF505DT : No charge

            Ok. So if i follow the datasheet, it's different :

            01 :ACN : 20.23V
            02 : ACP : 19.41V
            03 : CMSRC :20.02V
            04 : ACDRV : 25.30V
            05 : ACOK : 3.141V
            06 : ACDET : 2.741V
            07 : VCC: 19.90V
            08 : REGN : 6.029V

            SOrry for my error...

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14085
              • Canada

              #7
              Re: TUF505DT : No charge

              Much better. It will be a good idea to also post the pin # that you are measuring for others to review. This list is all good.

              If the logic board is not charging, the fault may be a detection one of the battery.

              Continue to measure the other pins on this charger IC for a review.

              Specifically, interested in the SDA & SCL pins on this charger IC but list each.

              Then, measure the voltage to ground of each pin on the battery connector. The SDA & SCL pins will also be present on this connector.

              These interface pins should be ~3v3 for each (SDA & SCL) if all is ok.

              Comment

              • kurtspirit
                Senior Member
                • Feb 2019
                • 112
                • France

                #8
                Re: TUF505DT : No charge

                1 - ACN : 19,41V
                2 - ACP : 20,23V
                3 - CMSRC : 20,02V
                4 - ACDRV : 25,29V
                5 - ACOK : 3,140V
                6 - ACDET : 2.741V
                7 - IADP : 3,196V
                8 - IDCHG : 0.01V
                9 - PMON : 0.04V
                10 : PROCHOT : 0.00V
                11 - SDA : 3.25V ~
                12 - SCL : 3.25V ~
                13 : CMPIN : 2.00V
                14 : CMPOUT : 4.92V
                15 : BATPRES : 0.00V
                16 : TB_STAT : 0.04V
                17 : BATSRC : 10.64V
                18 : BATDRV : 10.64V
                19 : SRN : 10.64V
                20 : SRP : 10.65V
                21 : ILIM : 3.14V
                22 : GND : 0.00V
                23 : L0DRV : 0.00V
                24 : REGN : 6,029V
                25 : BTST : 10.37V
                26 : HIDRV : 10.64V
                27 : PHASE : 10.64V
                28 : VCC : 19.90V

                For the battery connector (battery is plugged) :

                10.65V - 10.65V - 10.65V - 3.65V~ - 3.65V~ - 0V - 0V - 0V

                I don't know what happened but i have tried three different batteries and none of them charge...

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 14085
                  • Canada

                  #9
                  Re: TUF505DT : No charge

                  The voltage values look good for most of the charger pins except for HIDRV pin #26.

                  Does the laptop function with the pre-charged battery pack? (without the power adapter)

                  The gate voltage is almost the same as the battery voltage so suspecting that the high side charging mosfet is leaking.

                  Being a N-channel mosfet, the GATE voltage (HIDRV pin) must be HIGHER than the voltage being passed between source / drain pins to enable. At the same voltage as the input (19v), the mosfet will remain off.

                  Remove all power. Meter in resistance mode.

                  Measure the resistance across the high side mosfet pins as follows:

                  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 there is a low reading, the mosfet is defective and needs to be replaced.

                  Comment

                  • kurtspirit
                    Senior Member
                    • Feb 2019
                    • 112
                    • France

                    #10
                    Re: TUF505DT : No charge

                    Yes, the laptop start with battery pack only.
                    When you talk about mosfet, it's the twice near the BQ , right ?

                    https://ibb.co/5hBC3Zx
                    Last edited by kurtspirit; 03-14-2023, 11:39 AM.

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 14085
                      • Canada

                      #11
                      Re: TUF505DT : No charge

                      Can you post a pic of the area?

                      Yes, the HIDRV pin should be linked to this mosfet.

                      Then LODRV pin will be linked to the low side mosfet.

                      The 2 of these mosfets toggle ON / OFF to dial down the high input voltage of 19v.

                      The PCB trace should be simple to follow -> perhaps a resistor between the charger pin and the mosfet.

                      Also, the PHASE pin will have an inductor to monitor the final voltage for the battery charging.

                      Comment

                      • kurtspirit
                        Senior Member
                        • Feb 2019
                        • 112
                        • France

                        #12
                        Re: TUF505DT : No charge

                        Here is a "complete" pic :
                        https://ibb.co/bJJTHXx

                        Thank you
                        (I follow the thread but i have to go get my son )
                        Last edited by kurtspirit; 03-14-2023, 11:59 AM.

                        Comment

                        • mon2
                          Badcaps Legend
                          • Dec 2019
                          • 14085
                          • Canada

                          #13
                          Re: TUF505DT : No charge

                          If I am following the pcb layout correctly, the high side and low side charging mosfets are the ones above and to the left of the inductor with the 3R3 marking.

                          The mosfet above the 3R3 inductor appears to be the high side mosfet.

                          Remove all power and check the resistance of these mosfets.

                          From my understanding,

                          Left mosfet = low side charging mosfet
                          Top mosfet = high side charging mosfet
                          Right mosfet = battery mosfet

                          Comment

                          • kurtspirit
                            Senior Member
                            • Feb 2019
                            • 112
                            • France

                            #14
                            Re: TUF505DT : No charge

                            Originally posted by mon2
                            If I am following the pcb layout correctly, the high side and low side charging mosfets are the ones above and to the left of the inductor with the 3R3 marking.

                            The mosfet above the 3R3 inductor appears to be the high side mosfet.

                            Remove all power and check the resistance of these mosfets.

                            From my understanding,

                            Left mosfet = low side charging mosfet
                            Top mosfet = high side charging mosfet
                            Right mosfet = battery mosfet

                            Hi ,
                            How are you ?

                            If I take the measurement on the Mosfet, the resistance value never fixes. I don't understand how I should measure reliably?
                            Do you have a method for that?
                            There, I get values that start from 0.5MOHM and go down to 250K between S and D for example, but it moves all the time.
                            THANKS

                            Comment

                            • mon2
                              Badcaps Legend
                              • Dec 2019
                              • 14085
                              • Canada

                              #15
                              Re: TUF505DT : No charge

                              That is ok. More concerned with lower resistance values than this one. Just note the approximate range.

                              Continue to check the other pins and mosfets.

                              Post each measurement.

                              Comment

                              • kurtspirit
                                Senior Member
                                • Feb 2019
                                • 112
                                • France

                                #16
                                Re: TUF505DT : No charge

                                Hi,

                                Sorry for being late...
                                Here are the measurements:

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

                                Left : 8.36K
                                Top : 8.44K
                                Right : 8.46K

                                source (1-2-3) & gate (4)

                                Left :65K
                                Top : OL
                                Right : OL

                                gate (4) & drain (5-6-7-8)[/B]

                                Left : 160K
                                Top : OL
                                Right : OL

                                Maybe the left is burned ?

                                Thank you

                                Comment

                                • mon2
                                  Badcaps Legend
                                  • Dec 2019
                                  • 14085
                                  • Canada

                                  #17
                                  Re: TUF505DT : No charge

                                  They each look low but remove mosfet to the left.

                                  Then test the removed mosfet when it is on your work table.

                                  Also measure the resistance again of the top and right mosfets while the left mosfet is removed.

                                  Post the measurements.

                                  Comment

                                  • Sephir0th
                                    Badcaps Legend
                                    • Oct 2020
                                    • 1280
                                    • Germany

                                    #18
                                    Re: TUF505DT : No charge

                                    Does the board recognize the charge level of the batteries correct or do you have a random value like 0% or 255% shown in the task bar?
                                    FairRepair on YouTube

                                    Comment

                                    • kurtspirit
                                      Senior Member
                                      • Feb 2019
                                      • 112
                                      • France

                                      #19
                                      Re: TUF505DT : No charge

                                      With left removed, here are the measurements:

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

                                      Left : 0.90K
                                      Top : 0.90K
                                      Right : 0.90K

                                      source (1-2-3) & gate (4)

                                      Left :OL
                                      Top : OL
                                      Right : OL

                                      gate (4) & drain (5-6-7-8)[/B]

                                      Left : OL
                                      Top : OL
                                      Right : OL

                                      Comment

                                      • kurtspirit
                                        Senior Member
                                        • Feb 2019
                                        • 112
                                        • France

                                        #20
                                        Re: TUF505DT : No charge

                                        Originally posted by Sephir0th
                                        Does the board recognize the charge level of the batteries correct or do you have a random value like 0% or 255% shown in the task bar?
                                        The level seems to be ok. Actually, i have 11% with a battery at 10.65V.

                                        I see something strange i think : if i test the resistance between SRP and SRN, i must have 10 ohm or actually, i have 0. Is it normal ?
                                        Last edited by kurtspirit; 03-16-2023, 06:52 AM.

                                        Comment

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