Knowledge Base

USB Port on Flat Panel Monitor Non-Functional

Article Summary: This article explains how to troubleshoot the USB ports on a flat-panel monitor.

Make Sure the Upstream USB Cable is Connected

  1. Make sure there is a USB cable connecting the monitor to the computer in addition to the video cable.
  2. Make sure one end of the USB cable (Figure 1) is connected to the USB connector next to the other connectors on the monitor (Figure 2).

    Figure 1: Upstream USB cable showing the end that plugs into the monitor.

    Figure 2: EXAMPLE: P2314T LCD Display USB Type 2 USB uplink connection from computer to enable USB ports on the display,
  3. Make sure the other end of the USB cable is connected to the computer.
  4. Try a different USB cable to ensure the issue is related to the cable.

Restart the Computer and Monitor

  1. Restart the computer.
  2. Turn the monitor off and then back on.
  3. Before checking the USB connection, make sure the monitor has been on for at least 15 seconds.

Run the Diagnostic Test on your USB Ports

Browse to the Dell USB Diagnostics page and follow the prompts, to help identify and fix issues with your computer.

Make Sure the Monitor is Powered On

Verify that the monitor power light is on and shows your computer display.

Try a Different USB Port on the Monitor

Unplug the USB device you are trying to use and plug it into a different USB port on the monitor. If another port works, check the port for damage. Inserting a USB device backwards will damage the connection and the plastic spacer may get knocked out of the port. Port damage is not a warranty support issue unless the device is has active accidental damage coverage.

Try the USB Device in a USB Port on the Computer

Plug the device directly into a USB port on the computer to verify that it works.

Connect the USB Uplink Cable to Another System

The last test for the display itself is to connect the USB uplink to another system and see if the USB port is recognized and works on that system. If the USB uplink works on another system then the issue is likely a USB issue with the original system.

Troubleshoot the USB Input to your System

One issue you can easily test is to check the USB Root Hub properties of your system to ensure that Windows is not turning off the port to save power.

  1. Open Device Manager then click the arrow next to USB Serial Bus Controllers
  2. At the bottom of the list will be at least 2 and as many as 10 USB Root Hubs
  3. Right click each hub, click Properties on the drop down list then click the Power Management Tab
  4. Uncheck the box "Allow the computer to turn off this device to save power. (repeat on all USB Root Hubs) (Figure 1)
  5. Reboot the system and see is the USB ports on the Display now work.

Figure 1

Article ID: SLN145032

Last Date Modified: 06/26/2018 04:24 PM

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