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Lenovo L15 Gen2 Not Booting

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    #1

    Lenovo L15 Gen2 Not Booting

    My L15 doesnt power on. When I connect charger, charging light lights up, and Power LED blinks 3 times, then nothing... When I press power button nothing... I tried everything, remove batteries, checking fuses...

    Maybe BIOS is corrupt?

    Mainboard is: NM-D271 HL4A0 / HL5A0 REV2.0
    Last edited by chick0n; 11-28-2023, 06:24 AM.
    Tags: None
    #2
    Bios dump
    Last edited by Vesko356; 01-24-2024, 06:15 AM. Reason: Attached bios removed.

    Comment

      #3
      Originally posted by chick0n View Post
      Bios dump
      Do not post a bios dump in this section please.

      Reminder: rules and organization of this section
      https://www.badcaps.net/forum/troubl...f-this-section

      BIOS guides, methods, resources and tools -> https://www.badcaps.net/forum/troubl...rces-and-tools

      All bios related requests/replies goes to dedicated sub-forum only -> BIOS Requests ONLY!

      All bios related requests/replies rules are posted here -> RULES UPDATE for BIOS requests/offers *AVOID BANNING, READ BEFORE POSTING*
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      Comment

        #4
        sorry

        Comment

          #5
          Carefully measure the voltage to ground of each pin on dual dcin mosfet at PQ0204. Post each measurement. Schematics are available in the schematics forum.

          Comment

            #6
            Pin1 0V
            Pin2 0.443V
            Pin3 0V
            Pin4 0V

            Comment

              #7
              You do not have the power coming from the external power adapter (based on the measurement on pin # 2 of this dual mosfet).

              Carefully measure the voltage to ground at both sides of the fuse @ F6001.

              Click image for larger version Name: F6001.png Views: 112 Size: 58.2 KB ID: 3203465

              Comment

                #8
                I testet without poweradapter, just with batterie. I will test again tomorrow, with adapter.

                Comment

                  #9
                  Now measured with batterie and power adapter (batterie is charging)

                  Pin1 16.26V
                  Pin2 20V
                  Pin3 0V
                  Pin4 1.767V

                  When I connect the power adapter, the power led blinks three times. When i press power button, nothing happens.
                  When I disconnect cmos batterie and connect power adapter the power led stays on, fan spins up, cpu gets warm, but no picture. sometimes I even get a error code over speakers.

                  Comment

                    #10
                    Connect the power adapter. What is the voltage to ground at capacitor c6002?

                    what is the voltage at the fuse f6001?

                    Comment

                      #11
                      c6002 20V
                      f6001 0V (Fuse is good)

                      Comment

                        #12
                        It works:
                        https://www.badcaps.net/forum/troubl...n2-not-booting

                        SD-Card Controller was burned, and BIOS was Corrupt.

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