Chapter 4. Troubleshooting - Lenovo ThinkPad Universal Thunderbolt 4 Dock User Manual

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Chapter 4. Troubleshooting

General
1. The dock does not work after connected to my computer.
Ensure that:
• You use the accompanying ac power adapter, power cord, and Thunderbolt 4 cable.
• The dock is powered by its power adapter. The dock always needs the power adapter for operation.
• The dock driver is installed on your computer.
• The USB-C connector or Thunderbolt connector on your computer works well.
2. The function of wireless keyboard or mouse (2.4 GHz) is interrupted. The mouse pointer lags or
does not move. Some characters are lost when I input by the keyboard.
Connect the wireless device receiver to one of the following connectors on the dock:
• USB 3.2 connector Gen 2 on the front panel
• Right-most USB 3.2 connector Gen 2 on the rear panel
3. The mouse and keyboard cannot wake up my computer when connected to the Always On USB
3.2 connector Gen 2 on the dock.
Connect the mouse or keyboard to another USB connector on the dock.
4. The charging speed for my device, such as a smartphone, is slow.
Connect your device to an Always On USB 3.2 connector Gen 2 on the dock.
5. My computer cannot be charged by the dock.
Ensure that you use the accompanying ac power adapter, power cord, and Thunderbolt 4 cable to set
up the dock.
Video output
1. The external display is blank.
Ensure that:
• The external display is connected to ac power and turned on.
• Your computer is running correctly and not in standby or hibernation mode. When the computer is in
standby or hibernation mode, the external monitor display is always blank.
• The dock is securely connected to ac power, computer, and external display.
• The dock driver is installed on your computer.
If the problem persists, disconnect all cables from the dock, and uninstall the dock driver. Then, reinstall
the dock driver and reconnect all cables to the dock. See Chapter 2 "Set up the dock" on page 5.
2. The external DisplayPort or HDMI display has no display after I connect a Thunderbolt display to
the dock.
a. Disconnect all external displays from the dock.
b. Connect the DisplayPort or HDMI display to the dock.
c. Connect the Thunderbolt display.
3. The images on the external display flutter.
Ensure that the display cable is securely connected to the dock.
Disconnect and reconnect the display cable.
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