Dead Lenovo V-15 ADA

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  • doncius85
    Member
    • Feb 2022
    • 10
    • DE
    #1

    Dead Lenovo V-15 ADA

    Hello,
    Need help. I‘m working with dead Lenovo V-15 ADA (motherboard GV451&GV551 NM-D151). The laptop is quite new, mfg date 2020-10. Can‘t find any schematics for it. One of the chip LV5028 had a burned spot on it. Before ordering it from China, decided to do some measurements with chip removed. And now I‘m not sure will the new chip solve the problem. There are suspicious readings (chip desoldered):
    Pin 5 – 0.4Ohm
    Pins 7+8 – 5Ohm
    Pins 17+18 – 0.5Ohm
    Pins 12+13+14+15 - 4.6Ohm
    Found some datasheet of this chip (attached). Are theese readings normal? Or the problem is not only the chip?
    Attached Files
    Tags: None
    • doncius85
      Member
      • Feb 2022
      • 10
      • DE
      #2
      Re: Dead Lenovo V-15 ADA

      Any thoughts?

        Comment

        • mcplslg123
          Badcaps Legend
          • Jun 2015
          • 7262
          • india
          #3
          Re: Dead Lenovo V-15 ADA

          Remove PL500 & PL502 and re-measure the resistance on pins you mentioned. If resistance improves significantly, the ic is likely ok and problem is on the load side.

            Comment

            • doncius85
              Member
              • Feb 2022
              • 10
              • DE
              #4
              Re: Dead Lenovo V-15 ADA

              Originally posted by mcplslg123
              Remove PL500 & PL502 and re-measure the resistance on pins you mentioned. If resistance improves significantly, the ic is likely ok and problem is on the load side.
              Nothing changes with 500 and 502 removed. These lines are feeding the CPU, right? Maybe then such a low resistance is normal?

                Comment

                • doncius85
                  Member
                  • Feb 2022
                  • 10
                  • DE
                  #5
                  Re: Dead Lenovo V-15 ADA

                  Originally posted by doncius85
                  Nothing changes with 500 and 502 removed. These lines are feeding the CPU, right? Maybe then such a low resistance is normal?
                  By saying nothing changes I mean there is low resistance on the load side.

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13897
                      • Canada
                      #6
                      Re: Dead Lenovo V-15 ADA

                      Post the measured resistance values from your testing.

                        Comment

                        • doncius85
                          Member
                          • Feb 2022
                          • 10
                          • DE
                          #7
                          Re: Dead Lenovo V-15 ADA

                          All values are at the first post. Measured with chip removed:
                          Pin 5 – 0.4Ohm
                          Pins 7+8 – 5Ohm
                          Pins 17+18 – 0.5Ohm
                          Pins 12+13+14+15 - 4.6Ohm
                          Removing jumpers doesn't change anything all values remain the same to the load side.

                            Comment

                            • reformatt
                              Badcaps Legend
                              • Feb 2020
                              • 1399
                              • Australia
                              #8
                              Re: Dead Lenovo V-15 ADA

                              When I see a simultaneous short on +1V and +3V rails, the PCH section of the CPU is usually the cause. Confirm with 1V voltage injection and thermal camera. Board will be good as a donor only.

                                Comment

                                • mcplslg123
                                  Badcaps Legend
                                  • Jun 2015
                                  • 7262
                                  • india
                                  #9
                                  Re: Dead Lenovo V-15 ADA

                                  @reformatt is 100% right in assuming that.

                                    Comment

                                    • doncius85
                                      Member
                                      • Feb 2022
                                      • 10
                                      • DE
                                      #10
                                      Re: Dead Lenovo V-15 ADA

                                      Injected 1V, it draws 1.8Amps and one corner of the CPU gets slightly warm (only visible with thermal cam, can't feel with the finger). So, it's dead CPU

                                        Comment

                                        • koby058
                                          Badcaps Veteran
                                          • Jan 2017
                                          • 360
                                          • israel
                                          #11
                                          Re: Dead Lenovo V-15 ADA

                                          Hi,

                                          working on v14-ADA (same MOBO as this post)

                                          it turns on include fan but no post, try to flash bios from the bios forum but still same.

                                          any one can advise ?

                                            Comment

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