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Lenovo G480 can't be turned on

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    Lenovo G480 can't be turned on

    hi everyone, I am working on lenovo G480 code board = LG4858L UMA MB 12206-1
    measurement results:

    32MHz is ok
    ACOK# = 0
    5V Alw = 5 V
    3.3 Alw = 3.2
    PGood = 3.2
    Ac_in_kbc = 3.2
    ACPresent – 0 V

    did I correctly mark the image as signal path?
    Attached Files
    Last edited by fauzanmint; 07-26-2022, 09:07 PM.

    #2
    Re: Lenovo G480 can't be turned on

    Post the voltage reading from this ic.
    Attached Files
    I don't provide help for people using CH341A and a clip.

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      #3
      Re: Lenovo G480 can't be turned on

      In some mobo ACPRESENT will available after RSMRST#
      Ad_id available on KBC?
      Check KBC requirements lid_swicth, vcc, ec_rst# etc then check the trigger logic and see if RSMRST# is available and the SLP signal generating

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