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Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

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    #1

    Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

    LAPTOP: IDEAPAD 3 14IIIL05
    MODEL NAME: 81WD
    SERIAL NUMBER: PF2K713H
    BAORD: GS454/GS554/GV450/GV550 REV 1.0 NM-D031 2019-12-06
    PROCESSOR: i3-1005G1
    GRAPHICS: NO GFX
    ONBOARD RAM
    ISSUE: NO DISPLAY


    taking 30milliamp

    ALW_PWRGD-3.1v on and off state
    EC_RSMRST#- 3.0v
    PCH_PWROK- 0v onstate and off state 9.9k ohms
    PM_SLP_S3#- onstate 0v off state 0v
    PCH_DPWROK-3.0v on state and off state
    VCCST_PWRGD_R- 0v on/off state
    +VCCIN_AUX -0.8v
    +VCCIN- 0v
    +1.8VALW_P- 1.5v on and off state - 460 ohms going up
    +VDDQ_OUT- 0v on and off state - 182 ohms

    hope someone can help thanks in advance
    I also tried flashing types of bios but nothing had change .
    Attached Files
    Last edited by SMDFlea; 04-11-2023, 01:58 AM. Reason: IDEAPAD 3 14IIIL05
    Tags: None
    #2
    Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

    Page 3 of schematic has power sequence block diagram. Why not follow it? Does it makes sense to measure PM_SLP_S3 when PCH_PWROK is not correct?

    Measure resistance on all coils on ohms mode.

    Comment

      #3
      Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

      Originally posted by mcplslg123 View Post
      Page 3 of schematic has power sequence block diagram. Why not follow it? Does it makes sense to measure PM_SLP_S3 when PCH_PWROK is not correct?

      Measure resistance on all coils on ohms mode.
      ill update it sir tommorow

      Comment

        #4
        Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

        Originally posted by mcplslg123 View Post
        Page 3 of schematic has power sequence block diagram. Why not follow it? Does it makes sense to measure PM_SLP_S3 when PCH_PWROK is not correct?

        Measure resistance on all coils on ohms mode.
        +3VLP-3.3v
        +3VALW-3.3v
        +3VL_EC -3.3v
        +3VL -3.3v
        3VALW_PCH_EN -0v on and off state 99k to gnd
        EC_ON_1.8V -3.3v
        SUSP# -0v
        PLT_RST# -0v
        VCC_FSPI -3.3v

        +5VALW- 5V
        EC_ON-3.3v
        PCH_RSMRST#_R-3.0v
        SYS_PWROK-0v
        PCH_PWROK-0v on and off state
        +3VS-0V- on and off state 28k to gnd
        +5VS-0v on and off state 3.1mohms to gnd
        +1.8VALW -1.5v on and off state 450ohms to gnd


        VCCRTC-3,0V
        SRTC_RST#-3.0V
        RTC_RST#-3.0V
        +3VALW_PCH-3.3V
        EC_RSMRST#-3.0V

        coil.
        PL9801 -146ohms
        PL3400 -57ohms
        PL3401 -57ohms
        PL1101 -6kohms
        PL1601 -605ohms
        remove PJ406 - pin 1 -has 2megaohms pin 2 has 6kohms
        if PJ406 is connected together it has 602ohms without the PL1601 remove.
        PL9802- 153ohms
        PL9800- 445ohms
        pl100- 1.4megaohms

        Comment

          #5
          Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

          PL1601 -605ohms
          remove PJ406 - pin 1 -has 2megaohms pin 2 has 6kohms
          if PJ406 is connected together it has 602ohms without the PL1601 remove.

          Re-measure resistance to GND on PJ406,pin2(jumper being open). I strongly doubt your measurement here.

          Comment

            #6
            Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

            Originally posted by mcplslg123 View Post
            PL1601 -605ohms
            remove PJ406 - pin 1 -has 2megaohms pin 2 has 6kohms
            if PJ406 is connected together it has 602ohms without the PL1601 remove.

            Re-measure resistance to GND on PJ406,pin2(jumper being open). I strongly doubt your measurement here.
            i recheck again sorry it didnt have low resistance reading now is 0.662k from PJ406 to gnd

            Comment

              #7
              Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

              This reading is with PJ406 open or closed? If open, the reading is on which pad?

              If the reading is 0.662K on pin2 while jumper is open, then you have some short on consumer side. The resistance should be atleast few kilo ohms.

              Comment

                #8
                Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

                Originally posted by mcplslg123 View Post
                This reading is with PJ406 open or closed? If open, the reading is on which pad?

                If the reading is 0.662K on pin2 while jumper is open, then you have some short on consumer side. The resistance should be atleast few kilo ohms.
                yes its on pin 2 but Im having stable 5v, why?

                Comment

                  #9
                  Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

                  You always reply partially adding to the confusion. No mention of whether 5V is present with jumper in place or open.

                  To me, resistance og PJ406(jumper closed) should be few kilo ohms and usually 5V line has resistance of 10K or higher-so i've my doubt.

                  Wait for others comment.

                  Comment

                    #10
                    Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

                    Originally posted by mcplslg123 View Post
                    You always reply partially adding to the confusion. No mention of whether 5V is present with jumper in place or open.

                    To me, resistance og PJ406(jumper closed) should be few kilo ohms and usually 5V line has resistance of 10K or higher-so i've my doubt.

                    Wait for others comment.
                    Resistance to GND of +1.8VALW sounds low also, maybe a bad pchh?

                    Comment

                      #11
                      Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

                      Unit as been fixed it was just a shoorted SY6288D20AAC. UI4302 -Was the issue.Thanks for point the 5v line maybe the issue

                      Comment

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