Possible cause of coils no voltage after SIO swap because 19 V on middle pin Lenovo

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  • pischu7
    New Member
    • Mar 2022
    • 2
    • Germany
    #1

    Possible cause of coils no voltage after SIO swap because 19 V on middle pin Lenovo

    Hey guys,

    I am reading in here for years but have my own first questions just now. Thanks a lot for all the support so far!

    So here we go: Due to sheer stupidity I connected 19 Volts to the middle Pin on a Lenovo Laptop (Board NM-A361) and fried my SIO instantly. I know that because I had some smoke and a visual damage on the chip. So I bought a already to my board programmed replacement and soldert it in.

    However its not working just jet. I do have 19 V on all of the first Mosfet´s on the board but nothing at the coils. I do assume that the Super I/O is working since I do have a power-on LED when I press the Powerbutton and it goes out again on longpress; the power consumption is around 11 mA. The board is also charging the battery.

    I was under the impression that the Super I/O is starting up the different voltages on the board. So the obvious question is: Why not?

    Does anyone have a idea what I could check to investigate further?

    Thanks a lot in advance
    Markus
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