Lenovo s340-15-iwl

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  • ziko07
    Senior Member
    • Jun 2021
    • 93
    • Somewhere
    #1

    Lenovo s340-15-iwl

    I have this laptop, battery charge led ok,when press start button led goes ON for second and goes OFF
    Bios change not resolved problem
    I have ALW voltage 5v,3v3,1v05 and 1v8
    Any tips?
    Attached Files
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14028
      • Canada
      #2
      Re: Lenovo s340-15-iwl

      Remove all power / no battery. Check the resistance to ground of each and every coil = local power rail on the logic board. Checking for low resistance readings.

        Comment

        • ziko07
          Senior Member
          • Jun 2021
          • 93
          • Somewhere
          #3
          Re: Lenovo s340-15-iwl

          VCC_GT = 4R6
          VCC_CORE = 3R0
          VCC_SA = 16R
          1V2 = 129R

          Also connector in always voltage present and 1v3 present,for RAM I think,but no vcc core and vcc gt/sa
          Will see, enable signal to pwm ic same for all 3 rails

          Tnx

            Comment

            • ziko07
              Senior Member
              • Jun 2021
              • 93
              • Somewhere
              #4
              Re: Lenovo s340-15-iwl

              I go reverse from cpu core coil, no enable signal from rt3602 ic,but also rt3602 has all vcc but no enable signal VR_ON from kb9022q super IO chip
              Not know what condition should be IO chip to send this enable signal

                Comment

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