Hacking the keyboard connector on my thinkpad X1 tablet Gen 3

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  • Devicemodder
    New Member
    • Jul 2023
    • 2
    • Canada
    #1

    Hacking the keyboard connector on my thinkpad X1 tablet Gen 3

    I recently discovered that the dock connector on the Thinkpad X1 tablet Gen 3 uses USB for the keyboard on the POGO pins, I want to use that connector to add a USB 2.0 hub to my tablet case (lenovo medical case for the X1 tablet)

    Can't find much info on that bit online, but found lots of info for converting the Keyboards to USB. I wired up a USB port following https://sharktastica.co.uk/resources/im ... ogo-6p.jpg

    If i connect a 10K resistor between ground/pin1 and pin5 (NC) i get a USB ding and then i see voltage on the 5V pin, but it drops to 2-3V when i plug in a flash drive and windows gives me a "USB device not recognized". but... if i supply external 5V to the flash drive, with the power disconnected from the tablet 5v pin, the tablet recognized and mounts the flash drive. there's gotta be a way to keep the USB pin voltage stable. unless it's going overcurrent trying to run a flash drive...​

    Dunno if anyone has done what i am trying to attempt before. Basically, need to somehow trick the tablet into thinking a keyboard is attatched, so i can activate and use the USB port without an external power supply on the USB.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13829
      • Canada
      #2
      Not sure I am following your experiment but suggest the following:

      Mate only the D+ / D- and ground (3 wires) to your external hub controller. Power the external hub using another power adapter so that the downstream devices can be powered by the hefty USB hub power supply.

      That is all that should be required. The D+/D- are the USB signals. Try this idea and post your updates.

        Comment

        • Devicemodder
          New Member
          • Jul 2023
          • 2
          • Canada
          #3
          Originally posted by mon2
          Not sure I am following your experiment but suggest the following:

          Mate only the D+ / D- and ground (3 wires) to your external hub controller. Power the external hub using another power adapter so that the downstream devices can be powered by the hefty USB hub power supply.

          That is all that should be required. The D+/D- are the USB signals. Try this idea and post your updates.
          That is how i discovered originally that the flash drive mounts over USB from the keyboard connector. IIRC, said keyboard is also powered from the pogo port. I'm trying to get that power to run a hub self contained on the back of my tablet case and powered from the tablet.

          But to get the tablet to recognize anything on the connector, i have to use a 10K resistor on ground and pin 5.

          Last edited by Devicemodder; 01-13-2025, 05:16 PM.

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