Lenovo 320 no backlight

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  • lapfix
    Badcaps Legend
    • Mar 2020
    • 2659
    • my workshop
    #1

    Lenovo 320 no backlight

    Hello Folks
    Lenovo 320 -15AST
    Motherboard = NM-B321
    AMD with DDR 4

    Lenovo no backlight , Fan not turning on even the CPU get hot after a moment , not display at extern too.

    PSU =0.300 amp and increase !
    PL601/602 = 3/5 valaw ok
    Pl 2201 = +APU_CORE_NB = 0.897 v
    Pl 2202 = +APU_CORE = 0.897 v
    Bios Pin 8 = 1.8 V
    8/3 VS ok / 1.8VS ok / 0.95VS ok / 0.6 VS ok /

    PLT_RST = UL1 =Pin 19= 3.4v

    UE =
    pin 34 = EC_APU_ALWEN = 3.4V .

    Ram = +1.2V ok / +VDDSPD = 3.4V ok / +2.5V OK

    Flashed bios from web site /other site same issue , changing Screen same thing

    U7 = +3VS ok but no PCH_ENVDD.

    So , what i miss to check else !!
    Attached Files
    Tags: None
    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #2
      Re: Lenovo 320 no backlight

      Check QC9 Working or not. Btw, is mb posting?? Usb KBD numlock glows??

        Comment

        • lapfix
          Badcaps Legend
          • Mar 2020
          • 2659
          • my workshop
          #3
          Re: Lenovo 320 no backlight

          Thank you mcplslg
          No QC9 at this mobo ( @ ). not posting from HDMI too ,i try keyboard too nothing

            Comment

            • mcplslg123
              Badcaps Legend
              • Jun 2015
              • 7262
              • india
              #4
              Re: Lenovo 320 no backlight

              So you confirm your mb is not posting. Why bother about the backlit issue? You are not supposed to get it unless the mb posts. So better check all rails.

                Comment

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