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LENOVO 100-15ibd NM-A681 Doesn't detect battery

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    #1

    LENOVO 100-15ibd NM-A681 Doesn't detect battery

    Hello everyone I ask for your help with this laptop already honestly don't know what to do...
    The problem is that the battery didn't charge, or rather, it wasn't even visible, I had the same 100-15ibd, I took the battery from there and connected it, but the problem remained, I already put its battery in a working 100-15ibd and immediately started charging, then I changed the 8682L pu911 charger chip and that didn't help, after I flashed the BIOS from the site and firmware for the EC 128kb from there, but it didn't work ...
    then I changed ite8586e, the problem remained that the battery is not detected and is not charging ...
    But there is such a trick if you just connect a charged battery but the board does not start, but if you connect the power supply, the board turns on and if you immediately turn off the power supply, then the board continues to work from the battery ... but it also does not charge, but it works from it if only at first the board is turned on from the power supply and disconnect it, it continues to work from the battery... I decided to change the charging mosfets pq311 and pq309 but also nothing works, please help me solve this problem ... thanks.
    Tags: None
    #2
    Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

    Post the schematic that you are working with.
    Post the voltage of the charging IC.
    Post the voltages of the 2 first mosfets

    Comment

      #3
      Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

      https://www.badcaps.net/forum/showthread.php?t=90356
      2.2.2. Battery not detected
      Issue on charging circuit SMBUS.
      Check voltage and diode mode to ground on charging circuit SMBUS SDA and SCL lines
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

      Comment

        #4
        Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

        EC_SMB_CK1=2.398v-2.598v, EC_SMB_DA1= 3.3v with only adapter power.
        EC_SMB_CK1=0.026v, EC_SMB_DA1= 3.3v with only battery.

        Comment

          #5
          Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

          Remove all power. Meter in resistance mode.

          Check the resistance across the mosfet pins on the known good logic board.

          Compare the measurements of the same mosfet on the defective logic board.

          Review for the dc in mosfets. Most likely there is a fault in this area.

          Comment

            #6
            Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

            Check voltage and diode mode to ground on charging circuit SMBUS SDA and SCL lines
            .
            OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

            Comment

              #7
              Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

              PQ301 PQ302 Good I tested them on gates 4.80v as well on a good board... The problem is not the DC input mosfets.The problem is that EC_SMB_CK1=2.398v-2.598v should be 3.3v but it is low than needed.
              Attached Files
              Last edited by misha97123; 07-08-2022, 06:10 AM.

              Comment

                #8
                Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

                Originally posted by piernov View Post
                .
                Charger chip 8682L pin10SCL=EC_SMB_CK1=2.398v-2.598v, pin11SDA=EC_SMB_DA1= 3.3v
                with only adapter

                Comment

                  #9
                  Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

                  Your last post are voltage checks - they are not in DIODE mode.

                  Place meter in DIODE mode.

                  Red lead (yes RED) to GROUND.

                  Black lead to the pin to test. Confirm the DIODE mode readings of the SMBUS (I2C) interface lines (SDA & SCL).

                  Post your measurements.

                  Comment

                    #10
                    Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

                    Originally posted by mon2 View Post
                    Your last post are voltage checks - they are not in DIODE mode.

                    Place meter in DIODE mode.

                    Red lead (yes RED) to GROUND.

                    Black lead to the pin to test. Confirm the DIODE mode readings of the SMBUS (I2C) interface lines (SDA & SCL).

                    Post your measurements.
                    Diode mode on photo
                    about pin 10 scl with adapter jumps every 2-3sec 0.300-0.500 diode mode and voltage jumps 2.4v-2.6v
                    Attached Files
                    Last edited by misha97123; 07-08-2022, 06:53 AM.

                    Comment

                      #11
                      Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

                      DIODE mode = measured always without power.

                      RESISTANCE mode = measured always without power.

                      Comment

                        #12
                        Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

                        The photo shows measurements without power.
                        I changed another Ite8586e but the problem remained, the laptop works if you connect the battery and the adapter the laptop turns on and immediately disconnect the adapter, then the laptop continues on the battery but does not see and does not charge.

                        Comment

                          #13
                          Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

                          Originally posted by mon2 View Post
                          DIODE mode = measured always without power.

                          RESISTANCE mode = measured always without power.
                          This
                          Attached Files

                          Comment

                            #14
                            Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

                            Still need to review the DC-in mosfets.

                            Remove all power. Meter in resistance mode.

                            Check the resistance across the mosfet pins to check if it is defective.

                            Source (1-2-3) & Drain (5-6-7-8)
                            Source (1-2-3) & Gate (4)
                            Gate (4) & Drain (5-6-7-8)

                            Post the above readings (and the meter scale) for PQ301 and then again for the next mosfet PQ302 that follows. A low reading = defective mosfet.

                            reference:
                            http://electronicsbeliever.com/how-t...0good%20MOSFET.

                            See the resistance table on this webpage.

                            Comment

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