dell 7240 motherboard no power

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  • sureshbobby
    Senior Member
    • Mar 2015
    • 137
    • India

    #1

    dell 7240 motherboard no power

    Hi friends
    i need help for dell 7240 laptop which motherboard is LA-9431p
    No power issue.
    i have checked for short not found but the PU100 ic is heating up.
    please help
  • Techtiger
    Badcaps Legend
    • Oct 2014
    • 1601
    • france

    #2
    Re: dell 7240 motherboard no power

    Is the PQ700 switching +19V ? Is 3/5 ALW ok if not Resistance to GND pl101 102 ?
    Last edited by Techtiger; 11-14-2019, 11:36 PM.

    Comment

    • sureshbobby
      Senior Member
      • Mar 2015
      • 137
      • India

      #3
      Re: dell 7240 motherboard no power

      Yes at PQ700 19v is ok. but how to check resistance and PL101 PL102

      Comment

      • Techtiger
        Badcaps Legend
        • Oct 2014
        • 1601
        • france

        #4
        Re: dell 7240 motherboard no power

        Put the multimeter in ohms mode and test so 3/5V not Present?

        Comment

        • andresi
          Senior Member
          • Nov 2020
          • 152
          • INDONESIA

          #5
          Re: dell 7240 motherboard no power

          help, my latitude 7240, after plug adapter cant booting, no display, just power led blinking in 1 x 20 sec and i cant turn off it, i test in 19 and 5,3v is normal, i check bios voltase is normal. i have already flash any bios but not working, any Solution? btw this my Bios Ori.
          Last edited by SMDFlea; 01-11-2021, 02:40 AM. Reason: Bios dumps have a seperate section. Removed bios

          Comment

          • SMDFlea
            Super Moderator
            • Jan 2018
            • 20731
            • UK

            #6
            Re: dell 7240 motherboard no power

            Originally posted by andresi
            help, my latitude 7240, after plug adapter cant booting, no display, just power led blinking in 1 x 20 sec and i cant turn off it, i test in 19 and 5,3v is normal, i check bios voltase is normal. i have already flash any bios but not working, any Solution? btw this my Bios Ori.
            bios requests go here: https://www.badcaps.net/forum/forumdisplay.php?f=40
            All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

            Comment

            • ravi_1617
              YY Solutions
              • Jan 2012
              • 343
              • India

              #7
              Re: dell 7240 motherboard no power

              Originally posted by techtiger
              Is the PQ700 switching +19V ? Is 3/5 ALW ok if not Resistance to GND pl101 102 ?
              Hi same problem ,
              PU100 heating up.
              +DC1_PWR_SRC power showing around 13.5 volts.

              Opened PJP101 showing resistance 23 Ohms

              Opened PJP102 showing resistance 15 Ohms

              Couldn't find any short .
              Anything I am missing
              Thanks

              Comment

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