[SOLVED] J-Link Pro not working - LED flashing differently on different PCs

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  • [SOLVED] J-Link Pro not working - LED flashing differently on different PCs


    we have a J-Link Pro here that we bought a few weeks ago.

    Today a colleague attached it to his laptop and target and connected successfully with Ozone. Then the colleague went away for 20 minutes and when he came back, his laptop had gone into sleep mode. When he woke it up, the J-Link Pro status LED was flashing quickly but regularily and the LED with the arrow pointing towards the target connector was lit all the time. Conneting to the target was not possible anymore.

    Unplugging both target and USB didn't change the LEDs. After connecting the USB, the status LED is still flashing and the "out" LED is still lit even without a target connected.

    Connecting the same J-Link Pro to another laptop shows the status LED on with very short off-flashing each second. The "out" LED is still lit all the time.

    Plugging the J-Link Pro back into the first laptop shows it flashing again.

    Is there a way to find out what the problem is? Why is the LED behaving differently on two laptops. Both laptops are the same model with the same hardware configuration.

    Update: J-Link Commander shows:

    Source Code

    1. SEGGER J-Link Commander V6.62 (Compiled Jan 24 2020 16:32:43)
    2. DLL version V6.62, compiled Jan 24 2020 16:32:09
    3. Connecting to J-Link via USB...O.K.
    4. Firmware: J-Link Pro V4 compiled Jan 7 2020 16:52:59
    5. Hardware version: V4.00
    6. S/N: xxxxxxxxx
    7. License(s): RDI, FlashBP, FlashDL, JFlash, GDB
    8. IP-Addr: DHCP (no addr. received yet)
    9. VTref=0.000V
    10. Type "connect" to establish a target connection, '?' for help
    11. J-Link>
    Display All
    ... so it soes not seem to see a problem with the J-Link? Still. The LEDs are weird even without a target connector plugged in.


    The post was edited 2 times, last by icwiener ().

  • Hello,

    If the J-Link was purchased recently it is eligible for email support. Could you open a ticket as explained in my signature? My engineer colleagues will then provide you with further information.
    This thread will be closed now to avoid duplicate information or information loss.

    Best regards,
    Please read the forum rules before posting: Forum Rules

    Keep in mind, this is not a support forum. Its main purpose is user to user interaction.
    Our engineers will try to answer your questions between their projects if possible but this can be delayed by longer periods of time.
    Should you be entitled to support you can contact us via our support system: segger.com/ticket/

    Or you can contact us via e-mail.