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

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    #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.
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    Last edited by karim011; 03-16-2017, 05:29 PM.
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    #2
    Re: mother board for lenovo T400 turn on normal but....

    what about fuse in front of LVDS connector?

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

      it's good

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

        Pls guys help me.

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          #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/

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            #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?

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