SAMSUNG NP300E5V BA41-02209A PIOTEK. Power/ short

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  • ravi_1617
    YY Solutions
    • Jan 2012
    • 343
    • India
    #1

    SAMSUNG NP300E5V BA41-02209A PIOTEK. Power/ short

    Hi Merry Christmas
    I have this board not starting ,not charging when arrived.
    Found no power at source of 2nd mosfet Q503 AON7410 .on CRO i can see a spike (like mountain) every 1-2 seconds. Was approx 2-3 volts
    so suspect short somewhere.
    Didn't find any defective component in charging section ,but replaced BQ24735.
    So bypassed 1st mosfet Q502 AON7200 ,Than applied power increased bench power starting from 0 volt @ 2 to 4volts Aps increased .50-1Amps.
    Found Q568 AP4232 Heating, replaced it ,u529 TPS51219 too was heating .
    should i replace and check ,or am i missing some thing to check

    Thanks
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