nvme and wifi error after liquid metal spill

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  • questore
    Badcaps Veteran
    • Dec 2015
    • 571
    • csongrád
    #1

    nvme and wifi error after liquid metal spill

    Someone brought me a liquid metal damaged motherboard.
    First I have removed alll liquid metal from the board.
    0,75V_ALW was burned, and had to be removed and I have separated the layers until no short was on the VIN (B+) line and the output is no longer shorted.
    Applying 0,77V on the output with my lab PSU make the laptop caming on and i running windows from USB drive SSD
    There are 2 things that not working.
    1. The WIFI card keeps turning off and on with an error code 43 and 10 abouth every 10 seconds
    2. nvme devices are not detected on either of the 2 slots.

    Is there a possibility that a liquid metal got under CPU or could it be something else?
    How should i start to diagnose the slots?
    Tags: None
    • Answer selected by questore at Yesterday, 03:27 PM.
      questore
      Badcaps Veteran
      • Dec 2015
      • 571
      • csongrád
      Turns out that the connection wires of the 0,75v was a bit loose, so every time it would started to pull more than 510 miliamps the wire not provided enough voltage. Changing the connection ends and soldering the wires directly made the laptop wifi and nvme slots working. 0.75V_ALW seems to affect a lot os things
        • Selected Answer

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        • questore
          Badcaps Veteran
          • Dec 2015
          • 571
          • csongrád
          #2
          Turns out that the connection wires of the 0,75v was a bit loose, so every time it would started to pull more than 510 miliamps the wire not provided enough voltage. Changing the connection ends and soldering the wires directly made the laptop wifi and nvme slots working. 0.75V_ALW seems to affect a lot os things
            • Selected Answer

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            • m1ch43lzm
              Badcaps Legend
              • Mar 2019
              • 1008
              • Peru
              #3
              https://www.badcaps.net/forum/docume...and-enable-pin

              Suggestion: Find donor laptop motherboard with Ryzen 4000-5000 CPU (anything with Ryzen 2000-3000 CPU uses 0.9V, you have to modify the reference voltage divider), cut that section and graft it somewhere, test it with bench PSU first that you get the expected voltage out
              As long as that donor motherboard has schematics/boardview available you should be able to figure out something

              Your 0.75VALW later becomes 0.75VS, in the NM-D562 they used a MOSFET (QX3) to pass 0.75VALW to 0.75VS
              But in another design such as DAG7HAMB8E0/8F0/8I0, they used 2 separate 0.75V supplies for 0.75V and 0.75VS5, copy/paste the same circuit 2 times, 2A max each, Vin=3.3V

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