Lenovo Ideapad 100 NM-A681 no display

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  • ruletero
    Senior Member
    • Nov 2018
    • 182
    • Mexico

    #1

    Lenovo Ideapad 100 NM-A681 no display

    Hi everyone

    Please help me with this laptop:

    brand: lenovo Ideapad 100
    Mobo: NM-A681 Rev 1.0
    Fail: It turn on without video

    It consumes 128 mA with or without Ram, SOC stays cold, have programmed several bios, not success, doesn't release PM_DRAM_PWRGD (CPU_DRAMRST# in schematic.

    This is the power secuence measurements:

    PCH_PWR_EN 3.3
    +3VALW_PCH 3.3
    EC_RSMRST# 3.3
    PBTN_OUT# 3.3
    PM_SLP_S3# 3.3
    PM_SLP_S4# 3.3
    PM_SLP_S5# 3.17
    SYSON 3.3
    SUS_VCCP 3.3
    SUSP# 3.3
    VR_ON 2.83
    VR_READY 3.3
    PCH_PWROK 3.3
    SYS_PWROK 3.36
    PM_DRAM_PWRGD 0.123
    H_CPUPWRGD (VR_CPU_PWROK) 1.05
    PLT_RST# 0


    And this general measurements:

    PL501 1.35 +1.35V
    PL303 3.38 +3VALW
    PL304 5.07 +5VALW
    PL9 1.7 CPU_CORE
    PL701 1.05 +1.05VS
    PL302 0.6 BAT+
    PJ712 1.5 +1.5VS

    DDR 3L ram section voltage check list at ram slot (in red my measurements)

    DDR3L operating voltage VDD (at coil )= 1.35V PINs 75,76 ram slot 1.35V
    VRef_DQ = 0.67 V at PIN 1 0.69
    VTT/Termination voltage= 0.67V PINs 203,204 0.66 pin 204 0.67
    VRef_CA. = 0.67V PIN 126 0.67 pin 126 0.67
    VDD SPD = 3.3V PIN 199 3,32 pin 199 (without ram) 3.3
    SDA data = 3.3V PIN 200 3.30 pin 200 3.38
    SCL clock = 3.3V PIN 202 3.30 pin 202 3.38
    DRAM_RST# = 1.35V PIN 30 0v pin 30 0.112


    KBC

    SYS_PWROK 30 3.36
    PM_SLP_S3# 18 3.3
    PM_SLP_S4# 21 3.3
    PM_SLP_S5# 106 3.17
    VR_CPU_PWROK 70 1.05
    EC_RTCRST#_ON 73 0
    MAINPWON 79 2.64
    PCH_PWR_EN 97 3.3
    PCH_PWROK 99 3.3


    What other thing could I check?

    Please and thank you for your support
    Attached Files
    Last edited by ruletero; 02-09-2022, 12:19 PM.
  • Techtiger
    Badcaps Legend
    • Oct 2014
    • 1601
    • france

    #2
    Re: Lenovo Ideapad 100 NM-A681 no display

    Thé voltage in DRAM_RST# is +1.35V or 0.112 ! If 0.112V trace it back
    Last edited by Techtiger; 02-09-2022, 12:47 PM.

    Comment

    • ruletero
      Senior Member
      • Nov 2018
      • 182
      • Mexico

      #3
      Re: Lenovo Ideapad 100 NM-A681 no display

      DRAM_RST# (CPU_DRAMRST# in schematic) is only 0.112v and comes directly from PCH.

      Comment

      • mcplslg123
        Badcaps Legend
        • Jun 2015
        • 7262
        • india

        #4
        Re: Lenovo Ideapad 100 NM-A681 no display

        If you have a scope observe the pulse in VDD_SPD/SDA/SCL pins on ram slot.

        Comment

        • ruletero
          Senior Member
          • Nov 2018
          • 182
          • Mexico

          #5
          Re: Lenovo Ideapad 100 NM-A681 no display

          mmm no, I don't have scope . I'm going to try to get one

          thank you

          Comment

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