Asus TUF won’t run off battery

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  • rob777
    Member
    • Apr 2016
    • 12
    • Australia
    #1

    Asus TUF won’t run off battery

    I have an Asus TUF machine that doesn't run off battery. Runs off charger ok, shows orange battery charging light and shows battery is at 96%. Battery voltage is less than 0.5v though. It had a short on the 20v rail from a dead cap. Pic attached. Removed cap and replaced a dc in mosfet. Machine now powers and runs fine.
    I have also replaced all 3 battery mosfets with no change. The 1st battery mosfet has 20v going in. Pic attached.
    Does it sound like a battery ic problem, it has bq2470. Not sure if I should replace that as well at this stage as I'd need to order one.
    Thanks.

    update I think the battery is bad. It’s does not pull any current when I put power supply probes on it.
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    • mon2
      Badcaps Legend
      • Dec 2019
      • 13832
      • Canada
      #2
      Yes, test with a known good battery. The battery bms may be locked from a deep discharge state.

        Comment

        • mcplslg123
          Badcaps Legend
          • Jun 2015
          • 7262
          • india
          #3
          Please mention the original part number and replacement part number for dc-in mosfet.

            Comment

            • rob777
              Member
              • Apr 2016
              • 12
              • Australia
              #4
              Originally posted by mcplslg123
              Please mention the original part number and replacement part number for dc-in mosfet.
              QM3100M6 was original mosfet found on board and it was replaced with SiRA14DP.

              I have ordered a new battery in, will update once that is fitted.

                Comment

                • mcplslg123
                  Badcaps Legend
                  • Jun 2015
                  • 7262
                  • india
                  #5
                  Replacement mosfet is not suitable and has much lower specs.
                  QM31006-Continious Drain Current=160/Pulsed Drain Current=300
                  SiRA14DP-Continious Drain Current=58/Pulsed Drain Current=130

                  Btw, what is the voltage on pin4 of replacement dc-in mosfet?

                    Comment

                    • rob777
                      Member
                      • Apr 2016
                      • 12
                      • Australia
                      #6
                      Originally posted by mcplslg123
                      Replacement mosfet is not suitable and has much lower specs.
                      QM31006-Continious Drain Current=160/Pulsed Drain Current=300
                      SiRA14DP-Continious Drain Current=58/Pulsed Drain Current=130

                      Btw, what is the voltage on pin4 of replacement dc-in mosfet?
                      well that sucks. I used ChatGPT to find out if they were similar and it said better specs..
                      pin 4 was less than 1v from memory. Customer took laptop back and is using from charger only until I get replacement battery so I can’t measure to be sure right now. Maybe I need to order new mosfets as well then.

                        Comment

                        • mcplslg123
                          Badcaps Legend
                          • Jun 2015
                          • 7262
                          • india
                          #7
                          Pin4(Gate) should ve 25V and it cant be 1V as 19V flows too mb and you can turn it on with adapter only.

                          However, if the mosfet is shorted,the pin4 voltage may be 19V and thats a problem.

                          just confirm whenever its possible.

                            Comment

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