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Lenovo X1 Carbon 2. Gen no Display!

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    Lenovo X1 Carbon 2. Gen no Display!

    Notebooks is powering on without post.
    All power rails present, only L1 (Vcc_CPU_Core) measurement 0,112 V (resistance on L1 120 ohm).

    Flashing New bios no different.

    Mainboard: LMQ-1 MB 12298-2 48.4LY07.021
    Last edited by Ariu; 04-06-2022, 06:45 AM.

    #2
    Re: Lenovo X1 Carbon 2. Gen no Display!

    Hi, have you checked all voltages on the U16 chip to see if they are all good?

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      #3
      Re: Lenovo X1 Carbon 2. Gen no Display!

      Originally posted by JaroTech View Post
      Hi, have you checked all voltages on the U16 chip to see if they are all good?
      Hi,

      L1 #pin2 CPU side one leg desoldered and u16 measurement are like this:
      Pin1: 0V
      Pin2: 0V
      Pin3: 1,8V
      Pin4: 1,8V
      Pin5: 0,8V
      Pin6: 1,8V
      Pin7: 1,7V
      Pin8,9,10,11: 5,1V
      Pin12,13,14,15: 0,5V

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        #4
        Re: Lenovo X1 Carbon 2. Gen no Display!

        reflow ram chips with a hot air station, had one doing the same thing and that was the only fix that worked for a while. the ram failing are a common issue with the gen2 x1 carbons

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          #5
          Re: Lenovo X1 Carbon 2. Gen no Display!

          Reflowing RAM usually won't fix it, it will fail again shortly after. Problem appears to be CPU-related.
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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