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Lenovo E570 NM-B421 Turns on then off.

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    Lenovo E570 NM-B421 Turns on then off.

    Can I please get some help, I can't figure this out.

    Board: NM-B421
    Model: Lenovo ThinkPad E570

    Charger plugged in, flashes 3 times. Power button pressed, it turns on 2 seconds then off. Occasional fan spin slightly until it turns off again. Never more than 2 seconds.

    Attached PDF shows readings I gathered.

    Things tried:
    Flashed 5 different BIOS files, original bios dump + 5 others linked, schematics and board readings are all here:
    https://drive.google.com/drive/folde...US?usp=sharing

    Here is the video of the fault:
    https://youtu.be/OB6xf7211Mg

    Aditya11ttt says on a forum:
    'In this board u don't need to program io it will program auto , but still it's a theory u should try to program and update me it's done or not !!"

    Attached also the image of the board with readings.

    Anything else I can try? Thanks!
    Attached Files

    #2
    Re: Lenovo E570 NM-B421 Turns on then off.

    PQ301 Mosfet is playing weird. I've replaced the Mosfet already. The PU301 which is a RT8231AGQW is acting up I suspect. See measurements.
    Attached Files

    Comment


      #3
      Re: Lenovo E570 NM-B421 Turns on then off.

      Sorry this is the correct readings.
      Attached Files

      Comment


        #4
        Re: Lenovo E570 NM-B421 Turns on then off.

        I had similar experience with HP laptop, on 1-2 seconds and then off again. All voltages are present. Scratching head for a while before I discover the issue is due to faulty DRAM. Not sure if you have try replace the DRAM with known good DRAM.

        Comment


          #5
          Re: Lenovo E570 NM-B421 Turns on then off.

          You mean Dram controller? Ram is replaceable. Tried different ram.

          Comment


            #6
            Re: Lenovo E570 NM-B421 Turns on then off.

            Originally posted by sikocan View Post
            Can I please get some help, I can't figure this out.

            Board: NM-B421
            Model: Lenovo ThinkPad E570

            Charger plugged in, flashes 3 times. Power button pressed, it turns on 2 seconds then off. Occasional fan spin slightly until it turns off again. Never more than 2 seconds.

            Attached PDF shows readings I gathered.

            Things tried:
            Flashed 5 different BIOS files, original bios dump + 5 others linked, schematics and board readings are all here:
            https://drive.google.com/drive/folde...US?usp=sharing

            Here is the video of the fault:
            https://youtu.be/OB6xf7211Mg

            Aditya11ttt says on a forum:
            'In this board u don’t need to program io it will program auto , but still it’s a theory u should try to program and update me it’s done or not !!"

            Attached also the image of the board with readings.

            Anything else I can try? Thanks!
            anyone fixing this issue and stuck at this point of reading should check if the cpu pwm NP81218 is receiving the 5V (vcc) on pin#13, if not measure for short or replace ic.
            Last edited by ajbernasko; 06-09-2023, 01:35 PM.

            Comment

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