Dynabook Tecra A40-E - How to replace the CMOS RTC battery

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  • kordex35
    Member
    • Apr 2015
    • 49
    • Polska

    #1

    Dynabook Tecra A40-E - How to replace the CMOS RTC battery

    Hello
    I have a laptop dynabook tecra a40-e
    Motherboard model Dynabook Inc. 10 PCBA 7
    I have to enter the date and time every time
    I realize that the CMOS battery is dead, I can't locate it
    RTC backup is not working
    I kindly ask my esteemed colleagues for help, maybe a diagram
    Thank you very much in advanceโ€‹
  • mcplslg123
    Badcaps Legend
    • Jun 2015
    • 7262
    • india

    #2
    The mb is on your table and you cant locate the cmos battery-then how do you expect us to locate it for you friend?

    Comment

    • rogfanther
      Badcaps Veteran
      • Jul 2006
      • 458
      • Brazil

      #3
      Please, post pics of both sides of the motherboard.

      Comment

      • kordex35
        Member
        • Apr 2015
        • 49
        • Polska

        #4
        The board from the battery side, no BIOS battery, no battery on the other side either, please provide a diagram, it will be easier to locate
        Attached Files

        Comment

        • nosfay
          Senior Member
          • May 2024
          • 62
          • France

          #5
          BIOS battery is certainly built in the laptop battery, you should check if it's faulty or not.

          Comment

          • kordex35
            Member
            • Apr 2015
            • 49
            • Polska

            #6
            Any tips on how to check without a schematic it will be difficult

            Comment

            • nosfay
              Senior Member
              • May 2024
              • 62
              • France

              #7
              Just measure battery voltage with a multimeter. Or if you can boot in OS, you can check if battery is dead or not.

              Comment

              • kordex35
                Member
                • Apr 2015
                • 49
                • Polska

                #8
                Well, yes, but I don't know the main battery pinouts, so please send me the schematic

                Comment

                • nosfay
                  Senior Member
                  • May 2024
                  • 62
                  • France

                  #9
                  I don't have schematic, just remove battery and measure voltage between ground and all other pins.

                  Comment

                  • kordex35
                    Member
                    • Apr 2015
                    • 49
                    • Polska

                    #10
                    But there is still SDA SCL control, how to distinguish it from the cmos battery

                    Comment

                    • nosfay
                      Senior Member
                      • May 2024
                      • 62
                      • France

                      #11
                      If you have 0v at every pin, battery is certainly dead anyway.

                      Comment

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