mother board for lenovo T400 turn on normal but....

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  • karim011
    Senior Member
    • Nov 2016
    • 121
    • Morocco

    #1

    mother board for lenovo T400 turn on normal but....

    Hi. i've a mother board for lenovo T400 turn on normal but backlight's black (shaded), I measured on inveter & LCD CONNECTOR All voltage present except 20V not available on F7 for alimentation pins 86 & 88 & 90. i removed it for measure But 20V not found on place i Replace it their last but without result. pls someone help me.
    Attached Files
    Last edited by karim011; 03-16-2017, 05:29 PM.
  • ktmmotocross
    Boardkiller
    • Feb 2014
    • 3580
    • slovakia

    #2
    Re: mother board for lenovo T400 turn on normal but....

    what about fuse in front of LVDS connector?

    Comment

    • karim011
      Senior Member
      • Nov 2016
      • 121
      • Morocco

      #3
      Re: mother board for lenovo T400 turn on normal but....

      it's good

      Comment

      • karim011
        Senior Member
        • Nov 2016
        • 121
        • Morocco

        #4
        Re: mother board for lenovo T400 turn on normal but....

        Pls guys help me.

        Comment

        • ktmmotocross
          Boardkiller
          • Feb 2014
          • 3580
          • slovakia

          #5
          Re: mother board for lenovo T400 turn on normal but....

          u must have vinnt20 for notebook start. and there is fuse to VBL20 /F7/

          Comment

          • mlefebvre
            New Member
            • Apr 2017
            • 5
            • Colombia

            #6
            Re: mother board for lenovo T400 turn on normal but....

            Hi Karim, did you check the caps C313, C310 and C307 to ensure they're not shorted to GND?

            Comment

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