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sony svf14 HK8 no power

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    sony svf14 HK8 no power

    hi . i have a sony svf14 da0hk8mb6e0 rev e .
    no power
    main have 3.3 and 5 pcu . bios pin 8 have 3.3 .
    kbc chipset have 3.3 pcu and other .
    but on pwrbtn (nbswon ) are 0.3 v
    on kbc pwrbtn out ok
    lid sw ok
    rsmrst ok .
    bios check
    why no any voltage on power btn ? laptop dont power
    Attached Files

    #2
    Re: sony svf14 HK8 no power

    Make a short circuit of the KBC leg 15 (EC_PWRBTN #) to ground and see if the motherboard starts.

    Comment


      #3
      Re: sony svf14 HK8 no power

      i have done this but no power . still on power btn no voltage .

      Comment


        #4
        Re: sony svf14 HK8 no power

        Remove D1 diode and test again.
        Attached Files

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          #5
          Re: sony svf14 HK8 no power

          d1 not on board . empty

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            #6
            Re: sony svf14 HK8 no power

            What is the resistance to ground for NBSWON# on the switch ? Red meter probe on NBSWON# and black meter probe to ground.

            Confirm with the meter, that the switch is working. When you close the on/off switch, does the meter show close to 0 ohms ? I am assuming that the ON/OFF function is a simple mechanical switch for this design. Not sure if there is a logic board with the on/off switch.

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              #7
              Re: sony svf14 HK8 no power

              resistance nbswon# with gnd are 7.6 m/ohm .

              Comment


                #8
                Re: sony svf14 HK8 no power

                What is the resistance when you press the on/off button ?

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