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Lenovo Yoga 2 Pro Lenovo nm-a074 schematic and boardview

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    #21
    Re: Lenovo Yoga 2 Pro schematic and boardview

    i have been too optimistic with swapping lcd
    and i now know story behind yoga 2 pro death, previous owner ,,repaired,, adapter and notebook died on over voltage, it lived short on battery, then died

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      #22
      Re: Lenovo Yoga 2 Pro schematic and boardview

      THANKS

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        #23
        Re: Lenovo Yoga 2 Pro schematic and boardview

        Originally posted by snsent View Post
        try this..
        thank you
        Last edited by SMDFlea; 10-14-2020, 08:38 AM.

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          #24
          Re: Lenovo Yoga 2 Pro schematic and boardview

          hi all im dealing with a dead board on a Yoga 2 Pro i5 8gb Ram model that i accidentally tried to plug in the little "connector" that connects the motherboard to the daughterboard while i still had the AC power adapter plugged in (newbie mistake!) i was rushing, and tired.

          luckily this is a personally device and not a customers device.

          im hoping to repair it, not sure i have the same board posted in the archive or PDF on page 1 however.

          can someone help me identify if this is the correct board as posted in the literature above or if i'm SOL?

          Here's the set of images:
          https://imgur.com/a/HZ0Woju

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            #25
            Re: Lenovo Yoga 2 Pro schematic and boardview

            thanks

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              #26
              Re: Lenovo Yoga 2 Pro schematic and boardview

              Voir cpu

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                #27
                Re: Lenovo Yoga 2 Pro schematic and boardview

                Originally posted by snsent View Post
                Try this..
                Thank you!

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                  #28
                  Re: Lenovo Yoga 2 Pro schematic and boardview

                  Originally posted by 580shahzad View Post
                  Lenovo Yoga 2 Pro schematic
                  thank you!

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                    #29
                    Re: Lenovo Yoga 2 Pro schematic and boardview

                    HiThere,

                    I'm new for the forum, I got the same problem with the Lenovo 2 pro.

                    Do you still have the solutions?

                    For my case same problem mile yours but the fan start and stop for every 2 mins.

                    Thank you so much for your feedback

                    Regards

                    Lind

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                      #30
                      Re: Lenovo Yoga 2 Pro schematic and boardview

                      Originally posted by snsent View Post
                      Try this..
                      thanks in advance

                      from new member

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                        #31
                        Need Lenovo Yoga 2 pro 13 NM-A074 boardview

                        Hello, I have Lenovo Yoga 2 pro 13 with i7 4500U processor and 8GB RAM. I do have the schematic KONA NM-A074.
                        The laptop is working fine with bluetooth keyboard and mouse, but not with attached ones. At the startup The backlit LED of keyboard is ON, but later is not working. I have tried all windows based setting and now looking for HW debug.

                        I am looking for boardview file for KONA NM-A074, as unable to find the resistor locations. Please share if any one have.

                        If any one resolved similar issue, suggest the way forward. Thanks.

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                          #32
                          Re: Need Lenovo Yoga 2 pro 13 NM-A074 boardview

                          Which resistors ?

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                            #33
                            Re: Need Lenovo Yoga 2 pro 13 NM-A074 boardview

                            Trying to find R313, which is supplying 3V to the keyboard matrix at JP9 connector.

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                              #34
                              Re: Need Lenovo Yoga 2 pro 13 NM-A074 boardview

                              Do you have the boardview? The board silk print only have very few components listed.

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                                #35
                                Re: Need Lenovo Yoga 2 pro 13 NM-A074 boardview

                                Only the top and bottom silk screen files.

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                                  #36
                                  Re: Need Lenovo Yoga 2 pro 13 NM-A074 boardview

                                  By chance, do you have any resistors listed? If possible please share. Many thanks.

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                                    #37
                                    Re: Lenovo Yoga 2 Pro Lenovo nm-a074 schematic and boardview

                                    Unable to locate it on the silk screens but check near the JP9 connector.

                                    To the right side - since the R313 mates with pin # 2, it should be close by.

                                    Otherwise, post clear and zoomed up pics of the JP9 connector and nearby parts.
                                    Attached Files

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                                      #38
                                      Re: Lenovo Yoga 2 Pro Lenovo nm-a074 schematic and boardview

                                      I have checked all the near by parts. I have tried to check continuity with PIN2 and surrounded components. None of them is show-up. The test pads near J9 connector show the connection. The other way I have tried to check the resistance between PIN2 and +3V on connector JP26 PIN15. No success. Any idea, which +3V rail might have connected?

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                                        #39
                                        Re: Lenovo Yoga 2 Pro Lenovo nm-a074 schematic and boardview

                                        ..post clear and zoomed up pics of the JP9 connector and nearby parts.

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                                          #40
                                          Re: Lenovo Yoga 2 Pro Lenovo nm-a074 schematic and boardview

                                          Here are the closer look at J9 and the other side of the PCB at J9.
                                          Attached Files

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