Asus P5G41T-MLX Keyboard error

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  • dicky96
    Sun Seeker
    • Mar 2017
    • 1825
    • Spain

    #1

    Asus P5G41T-MLX Keyboard error

    Hi guys
    I have a P5G41T-MLX motherboard

    It boots but stops with POST code 81 - Keyboard reset error or stuck key

    This is with or without a PS2 keyboard attached.

    I have the datasheet for the SIO W83627DHG or at least I think this is the same, mine is W83627DHG-AC
    file:///C:/Users/Logger/Downloads/w83627dfg.pdf

    I have the boardview (attached here)

    On the KBC pins of the SIO I have

    Pin 59 (GA20) 3.3V
    Pin 60 KBRST 3.3V
    Pin 62 (KCLK) 0V
    Pin 63 (KBRST) 5V
    Pin 65 (MCLK) 0V
    Pin 66 (MDAT) 5V

    So ther eis no visible clock or data to the PS2 port

    There are some little resistor networks RORN8, RORN9 on boardview near the Keyboard port and these read OK. There is a funny white thing with 8 legs by those resistors. What is this? COCN1 on boardview, It reads 5.5K across each pair of pins.

    I washed the motherboard, dried overnight then I removed the SIO because there was still corrosion or deposits especially on the side pins 59-64. I then cleaned the board and SIO and resoldered it as I don't have that type in stock.

    After removing cleaning and resoldering the SIO I still have the same error 81

    Do I simply have a faulty SIO here or is there more to it than that. Is the BIOS maybe looking for a USB keyboard and I am barking completely up the wrong tree?

    Rich
    Attached Files
    Last edited by dicky96; 03-16-2020, 07:22 AM.
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  • dicky96
    Sun Seeker
    • Mar 2017
    • 1825
    • Spain

    #2
    Re: Asus P5G41T-MLX Keyboard error

    As no one seems to know if it could be something else or not, I've ordered a few W83627DHG-AC as they were only €1 each

    No idea how long they will take as we are on lockdown here, but post is still operating so who knows
    Follow me on YouTube
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    Learn Electronics Repair
    https://www.youtube.com/channel/UCFX...R8UZ2vg/videos

    Comment

    • SMDFlea
      Super Moderator
      • Jan 2018
      • 20709
      • UK

      #3
      Re: Asus P5G41T-MLX Keyboard error

      Those funny white things could be a capacitor array,according to RJ https://www.badcaps.net/forum/showthread.php?t=66318
      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

      Comment

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