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Lenovo g70-70 AILG1 NM-A331 no power

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    Lenovo g70-70 AILG1 NM-A331 no power

    Hello have this Lenovo g70-70 AILG1 NM-A331 with no power. second p-mosfet have 20v on gate. i cannot find shematic. what to do?

    #2
    Re: Lenovo g70-70 AILG1 NM-A331 no power

    I found Lenovo g50-70 schematic maybe it does help as reference(?)
    Attached Files

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      #3
      Re: Lenovo g70-70 AILG1 NM-A331 no power

      NM-A271 could be somewhat similar.

      Comment


        #4
        Re: Lenovo g70-70 AILG1 NM-A331 no power

        First thing is to make sure both DC-in MOSFETs are not shorted.
        OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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          #5
          Re: Lenovo g70-70 AILG1 NM-A331 no power

          Originally posted by piernov View Post
          First thing is to make sure both DC-in MOSFETs are not shorted.
          if thez was shorted, i will get 19V after them

          second is P channel so some charging logic is bad

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            #6
            Re: Lenovo g70-70 AILG1 NM-A331 no power

            i have ACDET, VCC, but no ACOK on BQ737

            replaced but still the same
            Last edited by ktmmotocross; 09-07-2019, 12:57 AM.

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              #7
              Re: Lenovo g70-70 AILG1 NM-A331 no power

              i jumped second mosfet and voltages looks ok even after press power button. but no post and power just jump to 8W

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                #8
                Re: Lenovo g70-70 AILG1 NM-A331 no power

                MAYBE ite PROBLEM?

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                  #9
                  Re: Lenovo g70-70 AILG1 NM-A331 no power

                  Originally posted by ktmmotocross View Post
                  i have ACDET, VCC, but no ACOK on BQ737

                  replaced but still the same
                  BQ737-ACOK is supposed to be low.So nothing wrong there i beleive.

                  Comment


                    #10
                    Re: Lenovo g70-70 AILG1 NM-A331 no power

                    If first DC-in MOSFET is fully shorted, both gates will have DC-in voltage on them, second MOSFET will never be turned on.
                    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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                      #11
                      Re: Lenovo g70-70 AILG1 NM-A331 no power

                      looks like u have right. first mosfet shorted between base and source. after replace power is good, but still no post

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                        #12
                        Re: Lenovo g70-70 AILG1 NM-A331 no power

                        guys anyone can help with this?

                        after mosfet change, it self start. all voltages are good. cpu and gpu is heat, but no post. try to flash bios but no luck

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                          #13
                          Re: Lenovo g70-70 AILG1 NM-A331 no power

                          Hello. please help! Lenovo G70-80 NM-A331 does not turn on. 3.3V, 5V okay, bios okay. Charges the battery. When the power button is pressed, the power white LED flashes only once and does not turn on. has anyone encountered such an error?

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                            #14
                            Re: Lenovo g70-70 AILG1 NM-A331 no power

                            You can start by trying bios. Are the coil resistances and voltages normal, are there any heated parts.
                            I'm not happy to be so strong. because it's not humanly

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                              #15
                              Re: Lenovo g70-70 AILG1 NM-A331 no power

                              Originally posted by Sametbey View Post
                              You can start by trying bios. Are the coil resistances and voltages normal, are there any heated parts.
                              I experimented, heated a video chip, and started the machine, it works. Motherboard bga error

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                                #16
                                Re: Lenovo g70-70 AILG1 NM-A331 no power

                                I add schematic.

                                https://www.badcaps.net/forum/showthread.php?t=79220
                                Last edited by SMDFlea; 07-20-2021, 04:11 AM. Reason: Schematic moved to schematic requests section

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