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USB3.0 Loopback Plugs

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  • USB3.0 Loopback Plugs

    Hello ,

    I am using the same PC , same USB3.0 port from PC and same test app(USB3.0Test) to perform test .
    Some USB3.0 Loopbak Plug devices could be executed but some devices were not.
    The devices which could not be executed would show USB3.0 Enumerated in the screen and test PC could not detect the device (as attached pics).
    How can I fix the devices which could not be detected by PC?

    Best Wishes
    Joshua
    PC could not detect device NG Device / The screen shows USB3 Enumerated
    Last edited by Smartmatic; 04-10-2018, 08:41 AM.

  • #2

    It is very likely that the USB3 lines that goes into the microcontroller are physically damaged. There are three possibilities:
    - The USB connector is worn. In most cases it is repairable unless the PCB is damaged.
    - The ESD protection circuits are dead. In most cases it is repairable.
    - The main chip is dead. In this case, it isn't really cost effective to repair the plug.

    There is a post here about common failure causes.
    https://www.passmark.com/support/usb_device_failure.htm


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    • #3
      Hello ,

      We have check our device for above three possibilities , the result are shown as below ~

      - The USB connector is worn. In most cases it is repairable unless the PCB is damaged.
      We observed the USB connector and did not found any USB worn.

      - The ESD protection circuits are dead. In most cases it is repairable.
      We do not have the schematic neither the information to compare.

      - The main chip is dead. In this case, it isn't really cost effective to repair the plug.
      We have check all of the device and they are working on USB2.0 test condition but not USB3.0 . In this situation we assume the main chip is fine.

      We also read the Common failure modes in the link and do not think we have done the cases.
      https://www.passmark.com/support/usb_device_failure.htm

      We bought more than 30 devices a month ago and now there are six devices with the issue on USB3.0 condition , could you please offer some help to fix the devices ?

      Best Wishes
      Joshua

      Comment


      • #4
        In all USB cables and in our USB3 device, There are separate lines for USB2 and USB3, if the USB3 lines are damaged, then it could be why the unit is still working via USB2. If they are working at USB2 speeds that means the main chip is partially damaged. Unfortunately it is not cost effective to repair the main chip.
        Given that you have six faulty plugs, it is highly likely you have (or had) a bad machine. e.g. it could be shorts in the wiring, ESD or missing ground connections.

        You might want to review your testing activities and investigate possible faults with the devices under test, or your methodology.

        You can also contact us via Email if you need some help.

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