Lenovo Z50-70 problem with chgarging

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  • sopik78
    Badcaps Veteran
    • Nov 2013
    • 517
    • Czech Republic
    #1

    Lenovo Z50-70 problem with chgarging

    Dear friends,

    I have a problem with MB NM-A271 from Lenovo Z50-70, which can't charge.

    There are measured values on IC BQ737 on attached picture, I think there is no problem, but please check it with me. KBC changed for the new one, BIOS and EC flashed, BQ 737 changed as well to be sure, but still not charging at all and charging LED doesn't light up. EC_SMB_CA1 and EC_SMB_DA1 checked on battery and on KBC with osciloscope. Battery changed.

    Any advice what to check?

    Many thanks.
    Attached Files
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    • sopik78
      Badcaps Veteran
      • Nov 2013
      • 517
      • Czech Republic
      #2
      Re: Lenovo Z50-70 problem with chgarging

      Nobody

        Comment

        • Sephir0th
          Badcaps Legend
          • Oct 2020
          • 1262
          • Germany
          #3
          Re: Lenovo Z50-70 problem with chgarging

          1,89V on Highdrv, Lowdrv and Phase Looks Like These three Pins are shorted together (Mosfets or IC). Did you checked that?
          Last edited by Sephir0th; 01-24-2021, 05:01 PM.
          FairRepair on YouTube

            Comment

            • mcplslg123
              Badcaps Legend
              • Jun 2015
              • 7262
              • india
              #4
              Re: Lenovo Z50-70 problem with chgarging

              check pq309/311 and specially pq306 working or not.

                Comment

                • sopik78
                  Badcaps Veteran
                  • Nov 2013
                  • 517
                  • Czech Republic
                  #5
                  Re: Lenovo Z50-70 problem with chgarging

                  Sephir0th: no short together

                  mcplslg123:pq309/311 changed for sure and still the same. pq306 I can't find.

                    Comment

                    • sopik78
                      Badcaps Veteran
                      • Nov 2013
                      • 517
                      • Czech Republic
                      #6
                      Re: Lenovo Z50-70 problem with chgarging

                      No idea what to check?

                        Comment

                        • Sametbey
                          Badcaps Veteran
                          • Jan 2021
                          • 229
                          • Turkey
                          #7
                          Re: Lenovo Z50-70 problem with chgarging

                          The PU301 should be 19v on 20 pins and 3v on 5 pins. Check the PQ301, PQ302 and PQ303 mosfet. and check the DC_IN ADPTER_IN entry.
                          I'm not happy to be so strong. because it's not humanly

                            Comment

                            • sopik78
                              Badcaps Veteran
                              • Nov 2013
                              • 517
                              • Czech Republic
                              #8
                              Re: Lenovo Z50-70 problem with chgarging

                              Pin 20 VCC 19V
                              Pin 5 ACOK 0V is OK for BQ737
                              PQ301, PQ302 and PQ303 were changed for sure but with the same result

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