Cpu_core signal missing. Lenovo g50. Help?

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  • Weelcup
    TopTech
    • Oct 2017
    • 300
    • UK

    #41
    Re: Cpu_core signal missing. Lenovo g50. Help?

    Originally posted by caspian
    do not solder PR9146 back on the board until you fix the CPU_VR_ON signal. Since there is no CPU_VR_ON, it seems the PCH is faulty. that is not good. to make sure, reprogram the Bios and the EC using the original dump while PR9146 is removed.
    I will caspian. But can I know what signals power on the PCH. In order for the PCH to be able to generate the CPU_VR_ON?

    I will get back soon. And tell the result of the reprogramming.

    Comment

    • caspian
      Badcaps Legend
      • Oct 2015
      • 1589
      • Laptop

      #42
      Re: Cpu_core signal missing. Lenovo g50. Help?

      that is a good idea. Before reprogramming, make sure all the power rails connected to PCH are present. Those power rails are the ones mentioned in page3-13 of the schematics except CPU_Core and VGA rails. If one of the rails is missing, the PCH will not work.

      Comment

      • Weelcup
        TopTech
        • Oct 2017
        • 300
        • UK

        #43
        Re: Cpu_core signal missing. Lenovo g50. Help?

        I done reprogramming and nothing new..
        I will check the rails as soon as I get back.

        Comment

        • SMDFlea
          Super Moderator
          • Jan 2018
          • 20299
          • UK

          #44
          Re: Cpu_core signal missing. Lenovo g50. Help?

          Where did you get the bios and ec dumps,can you post them here .
          All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

          Comment

          • Weelcup
            TopTech
            • Oct 2017
            • 300
            • UK

            #45
            Re: Cpu_core signal missing. Lenovo g50. Help?

            Originally posted by SMDFlea
            Where did you get the bios and ec dumps,can you post them here .
            YES SURE! Its My Pleasure>>>
            Actually I got two. each is from different websites....
            Here are they....

            both should work fine
            Attached Files

            Comment

            • aniladream
              New Member
              • Jul 2018
              • 1
              • India

              #46
              Re: Cpu_core signal missing. Lenovo g50. Help?

              Hi, I also have similar issue. Do you get any solution for this.

              Comment

              • Weelcup
                TopTech
                • Oct 2017
                • 300
                • UK

                #47
                Re: Cpu_core signal missing. Lenovo g50. Help?

                Originally posted by aniladream
                Hi, I also have similar issue. Do you get any solution for this.
                If you go through this post and still not have the signal then it is a cpu issue.
                I could not get it to work. And am believing the CPU was faulty.

                Comment

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