How to Fix HDMI Display Issues on a USB Hub

If your monitor doesn't display video or frequently disconnects when connected through a USB Hub, the problem may involve the source device, HDMI cable, monitor, power supply, or compatibility settings. This guide walks you through common troubleshooting steps to restore a stable display connection.

Key Takeaways

• Verify that all HDMI, USB, and power connections are securely connected before troubleshooting further.
• Confirm that the source device supports DisplayPort Alternate Mode (DP Alt Mode) when using a USB-C connection.
• Use appropriate power delivery and HDMI cables to ensure stable video output.
• Reduce display resolution or refresh rate if the monitor disconnects intermittently.
• Test with alternative devices, cables, and monitors to isolate the source of the problem

Scenario 1: HDMI Display Is Not Working at All

Step 1. Check Basic Connections and Peripherals

1. Disconnect the video source device, USB Hub, HDMI cable, and monitor, then reconnect them firmly.

2. If possible, connect the HDMI cable directly to the video source device to verify that the cable is working properly.

3. If available, try using a different monitor, computer, or HDMI cable to determine whether the issue is related to a specific device or accessory.

Step 2. Verify Device Compatibility and Power Requirements

1. If the source device is a laptop, please make sure that the USB-C port on the laptop supports DisplayPort Alternate Mode (DP Alt Mode). You may contact the laptop manufacturer to confirm this capability.

2. If the source device is a Nintendo Switch or PlayStation, please ensure that a power adapter is connected to the PD (Power Delivery) port of the USB Hub. These devices require external power for video output through the Hub. It is recommended to use a power adapter that supports PD 3.0 or above.

Step 3. Check HDMI Cable Length and Type

1. Avoid using excessively long HDMI cables. Use an HDMI cable shorter than 2 meters.

2. If a long HDMI cable is required, please use an active HDMI cable. The Active cables are usually labeled “Source” and “Display” on each end. Please note that active HDMI cables support signal transmission in one direction only, from “Source” to “Display”.

Notes:

1. The HDMI port on the USB Hub supports video output only and cannot be used for video input.

2. The USB-C port on the USB Hub does not support video output.

3. Most HDMI ports on laptops also support video output only.

Scenario 2: The Monitor Intermittently Disconnects

Step 1. If a monitor intermittently disconnects and reconnects when using the HDMI port of a USB Hub, the issue may originate from the video source device, the USB Hub, the HDMI cable, or the monitor. You may troubleshoot the issue using the steps below to check whether the display returns to normal.

• Unplug and re-plug all cables and devices to ensure a stable connection.
• Make sure the monitor uses the original power adapter or a power adapter with sufficient voltage.
• Try lowering the monitor's resolution and refresh rate.

Step 2. If the above methods still don't solve the problem, please perform the following steps to determine the scope of the issue.

• Try the USB Hub with another laptop that is confirmed to support USB-C DP Alt (Display Alternate) Mode.
• Try the USB Hub with a different HDMI cable. If possible, plug your HDMI cable directly into your video source device and see if you get a stable connection.
• Try the USB Hub with a different monitor.
• If possible, try a different USB Hub to see whether you can get a display on your laptop.

Q&A

Q1: Can I Display Video from the USB Hub on My Laptop Screen?

No. Most laptops support video output only and do not accept video input to the built-in display. The USB Hub HDMI port is intended for external displays only.

Q2: The HDMI Display Works, but the Resolution or Refresh Rate Is Lower Than Expected.

Please confirm that the selected resolution and refresh rate are within the supported range of the USB Hub, the monitor, and the HDMI cable. And don’t forget to adjust these parameters on your video source device

Q3: Does the USB Hub Support Other Resolutions and Refresh Rates?

Yes. Maximum resolution up to 4K@60Hz with backward compatibility, supporting 1080p@60/120/144Hz, 1440p@60/100/120Hz, and 4K@50/60Hz.

Q4: The HDMI Port Worked Before but Is Not Working Now.

Disconnect the USB Hub and HDMI cable, then reconnect them firmly and select the correct input source on the display.

Still Does Not Work After All Checks?

Please contact TP-Link Technical Support via phone or email for further assistance.