Samsung np350v no data .

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  • mo000
    Badcaps Veteran
    • Nov 2017
    • 272
    • algeria

    #1

    Samsung np350v no data .

    hi
    Samsung np350v QCLA4 LA-8861P ,REV 2.0
    the laptop power up with led on and off nothing else .
    I found 3.3v and 5v
    but no voltage on bios

    vcc bios comes from +3VS
    i track +3vs on the schematic


    no +vsb on gate of q29 q30

    i track the +vsb



    here i can't find PQ1 AND PQ2 on motherboard .

    any help? .
    Last edited by mo000; 10-15-2019, 11:08 AM.
  • Techtiger
    Badcaps Legend
    • Oct 2014
    • 1601
    • france

    #2
    Re: Samsung np350v no data .

    try to find out PJP3 jumper its +19V when that voltage comes to R409 R410 but it will NOT cross untill SUSP hit's Q10 Q11 after Q30 Q29 gate voltage will be +15V to DC to DC convert

    Comment

    • mo000
      Badcaps Veteran
      • Nov 2017
      • 272
      • algeria

      #3
      Re: Samsung np350v no data .

      Originally posted by techtiger
      try to find out PJP3 jumper its +19V when that voltage comes to R409 R410 but it will NOT cross untill SUSP hit's Q10 Q11 after Q30 Q29 gate voltage will be +15V to DC to DC convert
      finally i found the pjp 3 and pq1 and pq2 next cmos battery
      but amazing something was happen
      first no voltage on pjp3
      PQ1 D=0 g=19v s=19v this mosphet should works and get the +VSBP after the voltage appears at the gate ; this voltag comes from pq2
      but after i check the pq2 by the multimeter the voltag appears on pjp3 and the laptop works and show data on the screen

      i don't know exactly what happen
      can someone explain that? .

      Comment

      • mo000
        Badcaps Veteran
        • Nov 2017
        • 272
        • algeria

        #4
        Re: Samsung np350v no data .

        any idea ?

        Comment

        • digitalpc
          Badcaps Veteran
          • Jun 2016
          • 305
          • .DLL

          #5
          Re: Samsung np350v no data .

          Originally posted by mo000
          any idea ?
          mabye track damaged

          Comment

          • peste
            Super Moderator
            • Dec 2016
            • 12274
            • ROMANIA

            #6
            Re: Samsung np350v no data .

            maybe bad soldering..
            Due to a lack of donations, server free space at a critical level, and possible closure of Bios Requests all donations are welcome, click:

            >>>>> https://www.badcaps.net/index.php?pageid=donate1 <<<<<

            Every donation made will go towards server fees and maintenance costs.

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