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Acer E1-532 LA-9532P wont work without charged battery

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    Acer E1-532 LA-9532P wont work without charged battery

    Hello.
    HAve this Acer E1-532 LA-9532P that wont work without charged battery. if battery and power removed and attach power, forst two mosfet not work. if attach discharged battery its the same story.
    when i short first mosfet for second with attached battery everything work, like when i connect charged battery

    its the third laptop with same symptoms. have somebody clue why it behave like this?

    charger ic is BQ24735

    attached readings
    Attached Files
    Last edited by ktmmotocross; 09-17-2020, 03:05 AM.

    #2
    Re: Acer E1-532 LA-9532P wont work without charged battery

    check resistor of first mosfet if they are ok and what voltage they have.

    post voltage on : pq302, pq303, pr303, pq304, pq305

    measure volts with charger only, and with battery and charger .

    Comment


      #3
      Re: Acer E1-532 LA-9532P wont work without charged battery

      PQ101/PU102 Working checked?? 51ON# circuit probed??

      Comment


        #4
        Re: Acer E1-532 LA-9532P wont work without charged battery

        Originally posted by mcplslg123 View Post
        PQ101/PU102 Working checked?? 51ON# circuit probed??
        none of them are on board

        Comment


          #5
          Re: Acer E1-532 LA-9532P wont work without charged battery

          Originally posted by dellxps15 View Post
          check resistor of first mosfet if they are ok and what voltage they have.

          post voltage on : pq302, pq303, pr303, pq304, pq305

          measure volts with charger only, and with battery and charger .
          WITHOUT BATTERY:

          pq302: 123-short pulses up to 5V
          4 - short pulses up to 5V
          5678 - 19.5V

          pq303: 123 - short pulses up to 5V
          4 - short pulses up to 5V
          5678 - 2.5V with short pulses to 5V

          pr303: 2.5V with short pulses to 5V

          pq304: 5 - 2.5V with short pulses to 5V
          4 - 2.5V with short pulses to 5V
          123 - 2.5V

          pq305 - same as pq304


          WITH CHARGED BATTERY:

          pq302: 123- 20V
          4 - 26V
          5678 - 20V

          pq303: 123 - 20V
          4 - 26.6V
          5678 - 20V

          pr303: 20V both side

          pq304: 5 - 20V
          4 - 16.8V
          123 - 16.8V

          pq305 - 123- 16.76V
          4- - 21V
          5 - 20V

          Comment


            #6
            Re: Acer E1-532 LA-9532P wont work without charged battery

            remove pr303 and measure pq302 with charger only.

            then remove also pq303 and check pq303 voltage with charger only.

            battery nominal voltage ?

            Comment


              #7
              Re: Acer E1-532 LA-9532P wont work without charged battery

              Originally posted by dellxps15 View Post
              remove pr303 and measure pq302 with charger only.

              then remove also pq303 and check pq303 voltage with charger only.

              battery nominal voltage ?
              Without PR303 all works normal even without battery

              Comment


                #8
                Re: Acer E1-532 LA-9532P wont work without charged battery

                with all works normal what do you mean ? pq302 volt is 19 , 5 and 19 output ?

                is so put back pr303, remove pq304 and post result

                edit: before removing pq304, read voltage pins. then remove and read again voltage pins of pq304
                Last edited by dellxps15; 09-22-2020, 05:41 AM.

                Comment


                  #9
                  Re: Acer E1-532 LA-9532P wont work without charged battery

                  without it have same measures like without battery

                  without pr303 i have 20V on its pad

                  Comment


                    #10
                    Re: Acer E1-532 LA-9532P wont work without charged battery

                    i write not perfect. without pr303 and without battery u have 20volt on pr303 first pad?

                    if so put back pr303 and remove pq304. stil l20 volt on pr303 charger only ?

                    Comment


                      #11
                      Re: Acer E1-532 LA-9532P wont work without charged battery

                      "without pr303 and without battery u have 20volt on pr303 first pad?" - YES

                      if so put back pr303 and remove pq304. stil l20 volt on pr303 charger only ? - NO

                      Comment


                        #12
                        Re: Acer E1-532 LA-9532P wont work without charged battery

                        remove pq305 and put back pq304... without battery u have 20 volt on pr303 ?

                        Comment


                          #13
                          Re: Acer E1-532 LA-9532P wont work without charged battery

                          Originally posted by dellxps15 View Post
                          remove pq305 and put back pq304... without battery u have 20 volt on pr303 ?
                          without charged battery i have 2.5V on pr303

                          without battery and pr303 i have 20V on its pad

                          Comment


                            #14
                            Re: Acer E1-532 LA-9532P wont work without charged battery

                            that lead to me to a bad pq305.... (if u put back all component except pq305) and u have volts on pr303.

                            without pq305 try powering on the laptop. it should work without battery.

                            Comment


                              #15
                              Re: Acer E1-532 LA-9532P wont work without charged battery

                              Originally posted by dellxps15 View Post
                              that lead to me to a bad pq305.... (if u put back all component except pq305) and u have volts on pr303.

                              without pq305 try powering on the laptop. it should work without battery.
                              pq305 cannot be bad when normally charging

                              Comment


                                #16
                                Re: Acer E1-532 LA-9532P wont work without charged battery

                                monitor pu301 pin 11 voltage with psu only, with low charge battery and with full battery

                                Comment


                                  #17
                                  Re: Acer E1-532 LA-9532P wont work without charged battery

                                  it is in pq304 measurements

                                  Comment


                                    #18
                                    Re: Acer E1-532 LA-9532P wont work without charged battery

                                    edit: sorry didnt remember first post.

                                    pr316 resistor value ?
                                    also pr307, pr308, pr304

                                    pc301, pc302,

                                    i suspect one of these
                                    Last edited by dellxps15; 09-22-2020, 04:42 PM.

                                    Comment


                                      #19
                                      Re: Acer E1-532 LA-9532P wont work without charged battery

                                      now for me it is looks like battery must be attached, but not flat dischaged. i discharged battery, leave it out for a day and when i attach charger it work normally

                                      Comment


                                        #20
                                        Re: Acer E1-532 LA-9532P wont work without charged battery

                                        it should work without battery. ive read the datasheet of BQ24735RGRR and on first picture on #1 post we have:

                                        vcc in is 19 volt, , so pd302 works.
                                        acdet is 2.65 volt.... it's in range between 2.4 and 3.15 volt so it is ok as vin+ [r2/ (r1+r2) ] = 19.7*[64.9/(422+64.9)]= 2.62...
                                        acok 0volt, so something is not happy with the carger circuit
                                        acdrv should be over 6 volt..... i suppose it to be 8-9 volt.

                                        would be curious why without battery and withour pr303 mosfet are turned on. i would like to inspect with that, pu301 voltagepin without battery and withour pr303 ?. also maybe ec need to be reprogrammed ?

                                        acok is generated by VLP i would also inspect with this.... some value is not happy here

                                        about vlp, check r494 and r495.... pu301 is told to set ac on with: +3vlp when on battery and +3valws with ac only.

                                        check also r24 and r236 (0805 0m resistor near ec.)

                                        with psu only check if 3.3 rail is working

                                        edit: is rtc battery fully charged ?
                                        Last edited by dellxps15; 09-23-2020, 06:51 AM.

                                        Comment

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