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

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  • misha97123
    Member
    • Feb 2021
    • 36
    • Qazaqstan
    #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
    • lapfix
      Badcaps Legend
      • Mar 2020
      • 2715
      • my workshop
      #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

        • piernov
          Super Moderator
          • Jan 2016
          • 4435
          • France
          #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

            • misha97123
              Member
              • Feb 2021
              • 36
              • Qazaqstan
              #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

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 14011
                  • Canada
                  #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

                    • piernov
                      Super Moderator
                      • Jan 2016
                      • 4435
                      • France
                      #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

                        • misha97123
                          Member
                          • Feb 2021
                          • 36
                          • Qazaqstan
                          #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

                            • misha97123
                              Member
                              • Feb 2021
                              • 36
                              • Qazaqstan
                              #8
                              Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

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

                                Comment

                                • mon2
                                  Badcaps Legend
                                  • Dec 2019
                                  • 14011
                                  • Canada
                                  #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

                                    • misha97123
                                      Member
                                      • Feb 2021
                                      • 36
                                      • Qazaqstan
                                      #10
                                      Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

                                      Originally posted by mon2
                                      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

                                        • mon2
                                          Badcaps Legend
                                          • Dec 2019
                                          • 14011
                                          • Canada
                                          #11
                                          Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

                                          DIODE mode = measured always without power.

                                          RESISTANCE mode = measured always without power.

                                            Comment

                                            • misha97123
                                              Member
                                              • Feb 2021
                                              • 36
                                              • Qazaqstan
                                              #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

                                                • misha97123
                                                  Member
                                                  • Feb 2021
                                                  • 36
                                                  • Qazaqstan
                                                  #13
                                                  Re: LENOVO 100-15ibd NM-A681 Doesn't detect battery

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

                                                  RESISTANCE mode = measured always without power.
                                                  This
                                                  Attached Files

                                                    Comment

                                                    • mon2
                                                      Badcaps Legend
                                                      • Dec 2019
                                                      • 14011
                                                      • Canada
                                                      #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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