HDMI 2 & 3 will not work on UD-3900PDZ (have 3 monitors connected)


HDMI 2 & 3 will not work on my UD-3900PDZ. The HDMI Alt mode is functional.

Please advise.

Thank you…Franco

Hello there,

Thanks for reaching out on our forums! My name is Mychal and I’d be happy to help.

Based on some previous communications we’ve had, I believe you may be using a Windows-based system? If so, we can try a clean install of the DisplayLink software. Please follow the steps below:

Please follow the steps below to make sure that the dock’s DisplayLink driver is updated and working as we expect:

  1. Disconnect the dock from the system and please remove the power cable from the dock so it turns off completely (this is important so the unit resets). Please keep it disconnected until the last step

  2. Uninstall any and all software with ‘DisplayLink’ in the title that is present from within the Control Panel > Programs and Features. Don’t worry if these entries are not present or if the process does not work, just move onto the next step

  3. Download, extract and run the DisplayLink cleaner tool (https://plugable.s3.amazonaws.com/bin/DisplayLink/DisplayLink+Installation+Cleaner+10.1.2860.exe)

  4. Once the Cleaner has been run, reboot your computer (even if not prompted to)

  5. Download and install the 11.1 M1 DisplayLink software (https://plugable.s3.amazonaws.com/bin/DisplayLink/DisplayLink+USB+Graphics+Software+for+Windows11.2+M0-EXE.exe)

  6. Reattach the power cable to the dock first. Once the dock is powered on, reconnect the dock to your system

Let me know if these steps help at all.


Plugable Technologies

Process worked…will this happen often

Thank you

You’re very welcome!

We don’t expect this to happen often, but if it becomes a recurring problem please feel free to reach out to our team at support@plugable.com. We’ll take a deeper dive into what the issue might be from there.


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