BA733S IC replacement

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  • Jooo
    Badcaps Veteran
    • Oct 2011
    • 222
    • Finland
    #1

    BA733S IC replacement

    Hi, I have this laptop, when I connect the power adapter to it, the green light on the power adapter starts blinking rapidly. PSU is known good.

    I noticed this BA733S IC gets burning hot within seconds of plugging the laptop in - and so it is my suspect for the fault.
    I was unable to find any info on this IC, let alone finding a replacement for it. Any clues?
    Btw, that electrolytic cap is just a temporary, that cap was missing when I got the laptop, didn't have 47uF 25V SMD on hand.
    Attached Files
    Last edited by Jooo; 03-11-2014, 04:18 PM.
    Tags: None
    • dj_ricoh
      Badcaps Legend
      • Jan 2013
      • 2073
      • uk
      #2
      Re: BA733S IC replacement

      see the dot on the chip?
      that`s pin 1, pin 4 its gate.
      test the chip in diode mode 1,2,3 to 5,6,7,8 and back(change the probe position)

      to have good readings on it i suggest to take it of
      Just cook it! It's already broken.

        Comment

        • khaahk
          Badcaps Veteran
          • Dec 2013
          • 767
          • Estonia
          #3
          Re: BA733S IC replacement

          Info:

            Comment

            • trebo
              Badcaps Veteran
              • Feb 2010
              • 514
              • Wales, UK
              #4
              Re: BA733S IC replacement

              you are looking at the wrong part of the ic, its not BA733s, its AO4407 that you are looking at

                Comment

                • Sparks88
                  Senior Member
                  • Sep 2011
                  • 110
                  #5
                  Re: BA733S IC replacement

                  Power supply is blinking rapidly because it can sense a short circuit. I would start by looking nearer the power jack and checking for shorts there first.

                    Comment

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