sony VGN-G2 no USB drives

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  • guy_fixit
    New Member
    • Oct 2023
    • 2
    • USA
    #1

    sony VGN-G2 no USB drives

    I have here a Japanese market Sony VGN-G2ABNS. By the specs this ultaportable laptop is very similar to a Sony VGN-TZ series but with a 12 inch XGA display. U7700 cpu, 945GMS chipset, 1 to 2 GB DDR2 RAM, 1.8" pata-ZIF hdd, etc. As received it came with windows 10 - Japanese language. After I noticed my problem I swapped in a TZ hdd with winows 7 pro 32 bit.

    The problem I have with it is most USB devices do not work on it. Plug in a mouse or keyboard to either external port and that works fine. Any other device, either internal or plugged in will not work. Windows says "there is a problem with the unknown device" and "windows has stopped this device because it has reported a problem- code 43".

    This affects the internal USB optical DVD drive, finger print reader, and any (known good) external USB such as a flash drive, camera, external powered DVD drive, cell phone,etc. The internal (or my external) DVD will spin up with a disc in it but doesn't appear in Explorer or device manager. Again, an external mouse or keyboard does work OK.

    The internal DVD shows as "applicable" in Phoenix (trusted platform) BIOS, and "external boot device" is selected, but I can't boot from the DVD or any usb flash drive. The status LED on a flash drive does not blink - ever.

    The G2 main board is MBX-180, and visually looks like a revision of the VGN-TX850/TXN series (MBX-153). I can't find schematics or anything for MBX-180. I measure 5.1V at both external USB port (power) pins. Unplugging any (all) USB cables from the board doesn't affect this problem.

    I tested the USB data lines with DVOM in diode mode. All data lines read about 500mV (black lead) to ground (red lead). That's the same as my TZ.

    CLK_USB48 circuit at the clock generator ( ICS 9LPR321BKLF) pin reads 48MHz.

    I installed a 2 port USB 2.0 PC card in the card bus slot and that works normally for any device plugged into it - but I can't boot from it.

    Any suggestions or ideas would be appreciated.

    thanks
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14228
      • Canada
      #2
      Perhaps the usb cables being tested are not fully loaded? Suggest to purchase a known good usb 2.0 high speed (or usb 3.0 rated) data cable. This cable will offer vbus, D+, D-, ground lines for the usb 2.0 interface. You may be using only a usb charging cable with vbus and ground lines only. Amazon should have these but recommend a good branded cable and keep it short.

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