Dell E6540 laptop completely dead after dssasembly

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  • max-power
    New Member
    • Mar 2023
    • 6
    • Canada

    #1

    Dell E6540 laptop completely dead after dssasembly

    Hi, I disassemble my laptop to replace the speakers, to access them, you have to remove everything including the heat sink and fan, unscrew the motherboard, lift it up a bit to access the speaker wire.
    that was not the first time I dissasemble it, i did replace the same speaker a few year ago and I repaste it last year, so I had nothing to worry about. but when I put everything back together, its completely dead.

    After a bit of investigating, i found one pin of the status led ribbon cable that was unglued from the cable and bend touching another pin, I bend it back at his place but the laptop is still dead.

    i did try both the battery and power adaptor, same result with both.

    motherboard are crazy expensive for that model or untested when there not, so repairing it seem to be the way, I have some experience with SMD soldering but I have never done diagnostic on laptop.

    I did get the motherboard Valeo LA-9411 pdf manual here, but im not sure were to start.
  • pc_okay
    Badcaps Veteran
    • May 2022
    • 241
    • FRANCE

    #2
    Hello,

    so no light nothing?
    1rst Check voltage at D.C. jack in
    then if présent Check on PR701.
    then if présent Check 3.3v_alw

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