Samsung QX410 no power

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  • suiramix
    Senior Member
    • Mar 2011
    • 131
    • Canada
    #1

    Samsung QX410 no power

    Hi there,
    This forum is a great place to find answer and get some help… so I need some advice regarding this dead Samsung laptop model QX410 (refurbished) with no power. Removing the back panel and take a look at motherboard (BA92-07034A), it seems had repair attempt (reflow CPU and GPU) …I know , that is not a good sign!
    However moving forward, I removed the RAM, HDD, wireless card, KB when I noticed the first MOSFET AO4419 (source) connected to power adapter was overheated and melts the keyboard ribbon (see first photo). The continuity test reveals that is shorted out. Replacing with new one did not change the status…as soon you plug in the power adapter will smell burned plastic. The gate voltage is 9.5V….I don't see any damaged components on that area… so I am back to square one!
    The TI TPS51125 DC/DC converter chip has sign of reflow (replaced maybe?)…at this point I need your expertise: if is worth to get the schematics (even there is no components label on PCB?) and spend more time ??…
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    • Claudio Silva
      Senior Member
      • Feb 2013
      • 94
      • Portugal
      #2
      Re: Samsung QX410 no power

      You have to check DCIN circuit

        Comment

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