Lenovo ideapad 710s-13isk no power

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  • koby058
    Badcaps Veteran
    • Jan 2017
    • 360
    • israel

    #1

    Lenovo ideapad 710s-13isk no power

    Hi

    Lenovo ideapad 710s-13isk i can see 5vALW but cannot see 3.3VALW

    i can see that EN1 present but EN2 is not

    Can you please help find fault ?

    attached schematics abd photo of board en2 area
    Attached Files
  • Sephir0th
    Badcaps Legend
    • Oct 2020
    • 1258
    • Germany

    #2
    Re: Lenovo ideapad 710s-13isk no power

    Please onfirm whether 5V_EN is indeed present or not
    FairRepair on YouTube

    Comment

    • koby058
      Badcaps Veteran
      • Jan 2017
      • 360
      • israel

      #3
      Re: Lenovo ideapad 710s-13isk no power

      Originally posted by Sephir0th
      Please onfirm whether 5V_EN is indeed present or not
      Yes, I have 20v on EN1 and 3.3v on EN2

      Comment

      • Sephir0th
        Badcaps Legend
        • Oct 2020
        • 1258
        • Germany

        #4
        Re: Lenovo ideapad 710s-13isk no power

        But at PU4501 Pin11 (3V_EN) is missing? Weird, but can't be hard to solve since it comes the missing enable comes from 5V_EN via PR4515. So find PR4515 and check voltage at both sides.

        Do you have a short to GND at 3V_EN by any chance?
        FairRepair on YouTube

        Comment

        • koby058
          Badcaps Veteran
          • Jan 2017
          • 360
          • israel

          #5
          Re: Lenovo ideapad 710s-13isk no power

          I think i made mistake in the problem description

          Please let me try again

          on PU4501 pin11 (EN2) is present 20v
          on pin12 (EN1) not present 0V

          I think I found PR4515 it has 3.3v on on side, its resistance is 0.33M ohm

          attached photo
          Attached Files

          Comment

          • Sephir0th
            Badcaps Legend
            • Oct 2020
            • 1258
            • Germany

            #6
            Re: Lenovo ideapad 710s-13isk no power

            I think I did a mistake too. So it seems like PR4515 is missing by factory and 3V_EN will be pulled up from S5_ENABLE, so probably only AFTER power button press and for this reason no issue at this point.
            Check whether S5_ENABLE is indeed not present, whether you have 3.3V at the power button and whether the power button itself works as supposed to be.
            FairRepair on YouTube

            Comment

            • koby058
              Badcaps Veteran
              • Jan 2017
              • 360
              • israel

              #7
              Re: Lenovo ideapad 710s-13isk no power

              the computer turns on for a few seconds then turns off (fan spinning)

              Also, can you please explain how did you understand from schematics that 3.3 will be available only after power on ?
              Last edited by koby058; 10-24-2022, 08:32 AM.

              Comment

              • Sephir0th
                Badcaps Legend
                • Oct 2020
                • 1258
                • Germany

                #8
                Re: Lenovo ideapad 710s-13isk no power

                Was just a shot into the blue, but since the board does power an with even the fan spinning, it seems like it is exactly like this.

                However, you have very likely a completely different issue then which has probably nothing to do with 3.3V.

                you should check the voltages which come up, while the board is on so we can look where it is stuck in the sequence. Also resistance to GND measurements of each power rail (at least of the coils) would be helpful at this point.
                FairRepair on YouTube

                Comment

                • koby058
                  Badcaps Veteran
                  • Jan 2017
                  • 360
                  • israel

                  #9
                  Re: Lenovo ideapad 710s-13isk no power

                  OK, this machine is tricky, I will share

                  today i played with it and when i removed the nvme ssd it turned on and post.
                  then when i re assembled it. again, it is powering on but no post.
                  some time it is post and most of the time it does not.

                  i can see that cpu is getting very hot and i saw now that when it powers on i see multiple color dots on the screen randomly flickering

                  Video

                  I will be glad to here any opinion
                  Last edited by koby058; 10-24-2022, 01:37 PM.

                  Comment

                  • Sephir0th
                    Badcaps Legend
                    • Oct 2020
                    • 1258
                    • Germany

                    #10
                    Re: Lenovo ideapad 710s-13isk no power

                    So it turns out to being a weird one, hm? we can forget the 3V_EN now I guess...

                    So we have either a display or a graphics issue. I guess we should able to exclude the display by checking whether the behaviour is the same with external screen. Try and report pls

                    Unfortunately my bets are on graphics issue
                    FairRepair on YouTube

                    Comment

                    • mcplslg123
                      Badcaps Legend
                      • Jun 2015
                      • 7262
                      • india

                      #11
                      Re: Lenovo ideapad 710s-13isk no power

                      EDP cable and screen checked??

                      Comment

                      • koby058
                        Badcaps Veteran
                        • Jan 2017
                        • 360
                        • israel

                        #12
                        Re: Lenovo ideapad 710s-13isk no power

                        The laptop work fine on external monitor also run furmark on it and it works, I will try another screen.

                        Comment

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