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Lenovo Yoga 2 Pro Lenovo nm-a074 schematic and boardview

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    Lenovo Yoga 2 Pro Lenovo nm-a074 schematic and boardview

    Need the schematic of the laptop.
    Got a dead laptop.
    Thank you in advance
    Last edited by SMDFlea; 06-23-2021, 03:03 AM.

    #2
    Re: Lenovo Yoga 2 Pro schematic and boardview

    Hi, some information please ? sympthoms etc.

    Comment


      #3
      Re: Lenovo Yoga 2 Pro schematic and boardview

      Originally posted by tomodachi View Post
      Hi, some information please ? sympthoms etc.
      Cannot on, blank screen, keyboard backlight flash every few second.

      Comment


        #4
        Re: Lenovo Yoga 2 Pro schematic and boardview

        anyone can help ?

        Comment


          #5
          Re: Lenovo Yoga 2 Pro schematic and boardview

          Have you dissembled it yet? What are the etchings on the board to better identify and search for it...

          Comment


            #6
            Re: Lenovo Yoga 2 Pro schematic and boardview

            yes dissembled. main board is small with cpu n ram embedded.
            part number VIUU3 NM-A074 rev1.0
            ebay is selling but expensive.

            anyone got it, thanks

            Comment


              #7
              Re: Lenovo Yoga 2 Pro schematic and boardview

              Hi, I got the same laptop, and it doesn't start...Have you repaired yours?

              Comment


                #8
                Re: Lenovo Yoga 2 Pro schematic and boardview

                I have not repaired it yet.
                No idea what is wrong.

                Comment


                  #9
                  Re: Lenovo Yoga 2 Pro schematic and boardview

                  Try this bios..

                  https://www.badcaps.net/forum/showthread.php?p=1033593
                  Last edited by SMDFlea; 03-23-2021, 04:47 AM. Reason: Bios moved to "Bios Requests ONLY!"

                  Comment


                    #10
                    Re: Lenovo Yoga 2 Pro schematic and boardview

                    Lenovo Yoga 2 Pro schematic
                    Attached Files

                    Comment


                      #11
                      Re: Lenovo Yoga 2 Pro schematic and boardview

                      580s thanks for the file. its a great help looking into the motherboard.

                      wonder if u also have the boardview file

                      Comment


                        #12
                        Re: Lenovo Yoga 2 Pro schematic and boardview

                        Originally posted by spintop View Post
                        wonder if u also have the boardview file
                        I think right now not available, Hard to find boardview for LCFC-NM family.

                        Comment


                          #13
                          Re: Lenovo Yoga 2 Pro schematic and boardview

                          With ac adaptor n battery connected, I am only getting 8v at Vin (see diagram
                          Page 29). I m expecting 19v here. This is not normal isn't it ?

                          Btw I have already change the IC pu10.
                          Dcin at Pin 2 = 19v
                          Adet pin 3 = 3.5v
                          Acok pin 14 = 3.3v
                          Vdd pin 19 = 5.1v
                          Above voltage looks normal. Ie without switching on the laptop yet.
                          I also have 3.3v available. So pu6 is working.
                          But no 5v from pu5. Meaning system is not turn on yet.
                          At v_chg is 19v.

                          Comment


                            #14
                            Re: Lenovo Yoga 2 Pro schematic and boardview

                            what is the voltage on pin 4 of pq4 and pq33?

                            Comment


                              #15
                              Re: Lenovo Yoga 2 Pro schematic and boardview

                              at PQ4 -- pin4 =1.8v pin1=20.2v pin5=20.2
                              at PQ33 -- pin4 = 19.7v pin1=19.7v pin5=20.2

                              Comment


                                #16
                                Re: Lenovo Yoga 2 Pro schematic and boardview

                                can Vin be just 8.5V when ac adaptor and batt is present ?

                                Comment


                                  #17
                                  Re: Lenovo Yoga 2 Pro schematic and boardview

                                  Originally posted by spintop View Post
                                  at PQ4 -- pin4 =1.8v pin1=20.2v pin5=20.2
                                  at PQ33 -- pin4 = 19.7v pin1=19.7v pin5=20.2
                                  Make all measurements without battery. Remove pq33 and check it.

                                  Comment


                                    #18
                                    Re: Lenovo Yoga 2 Pro schematic and boardview

                                    with PQ33 removed, no batt. getting below readings

                                    at PQ4 -- pin4 =1.8v; pin1=20.2v; pin5=20.2
                                    at PQ33 -- pin4 = 1.2v pin1=1.1v; pin5=20.2

                                    at pu10, pin26 (sgate) =1.3v
                                    i checked pq33 (p-channel), in diode mode drain-source is 0.545
                                    pq33 seems normal.

                                    Comment


                                      #19
                                      Re: Lenovo Yoga 2 Pro schematic and boardview

                                      I am not able to fix the laptop. I have already sold it away. Are u getting Vin abt 8.5v ? My initial thought was 19v, but I think 8.5v should be normal for this laptop. Then the power ic is fine.
                                      I saw someone online heating up the CPU area, and it solved the blinking keyboard issue. So it could jus be some weak solder joints.

                                      Comment


                                        #20
                                        Re: Lenovo Yoga 2 Pro schematic and boardview

                                        hmm, sorry to hear that, yes i have 8,5 V Vin, mosfets looks okay, i tried reflowing cpu, but nothing, only that one chip is heating like hell. I accidentaly touch some resistors near it and one fan turned on
                                        im wondering, can i swap cpu to normal yoga 2 13? i know its soldered on i have usable equipment, in my yoga 2 13 is i5 4210u 3MB cache and only 4gb ram :/
                                        or LCD screen ? it have different cables, but eDP should be same on lcd pannel, swap 4k to yoga 2 with 1080p sreen
                                        i will wait for IC from ebay, Now i am only looking for what can be done.
                                        Last edited by flankerzo; 09-10-2018, 01:47 AM.

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