Dell Precision Dual USB Type-C Thunderbolt 3 Dock User Manual page 32

Symptoms
9. USB port has no function in a pre-OS environment.
10. PXE boot on dock does not function.
11. USB Boot does not function.
12. AC Adapter is displayed as "Not Installed" in the Battery
Information page of the Dell BIOS Setup when the Thunderbolt 3
(Type-C) cable is connected.
13. Peripherals connected to the docking station do not work in a
pre-OS environment.
14. Alert message "You have attached an undersized power adapter
to your system" is displayed when the docking station is connected
to your computer.
15. Undersized power adapter warning message displayed and cable
LED is off.
16. No external display. USB or data and cable LED is off.
32 Troubleshooting the Dell Precision Dual USB Type-C Thunderbolt 3 Dock-TB18DC
Suggested solutions
• If your BIOS has an USB/Thunderbolt Configuration page,
please make sure the following options are checked:
• 1. Enable USB Boot Support
• 2. Enable External USB Port
• 3. Enable Thunderbolt Boot Support
• If your BIOS has an integrated NIC page, please select Enabled
w/PXE.
• If your BIOS Setup on your computer has an USB/Thunderbolt
Configuration page, please make sure the following options are
checked:
• 1. Enable USB Boot Support
• 2. Enable Thunderbolt Boot Support
• If your BIOS has an USB/Thunderbolt Configuration page,
please make sure the following options are checked:
• 1. Enable USB Boot Support
• 2. Enable External USB Port
• 3. Enable Thunderbolt Boot Support
• 1. Make sure the Dell Thunderbolt Dock TB18DC is connected
properly to its own adapter (240 W).
• 2. Make sure the cable LED of your docking station is ON.
• 3. Disconnect and then re-connect the Thunderbolt 3 (Type-C)
cable to your computer.
• Thunderbolt Boot Support is by default disabled in BIOS Setup
on your Dell computer. With such default setting the docking
station and the peripherals connected to the docking station do
not work in a pre-OS environment.
• If the BIOS Setup on your computer has an USB/Thunderbolt
Configuration page, check the following options to enable
docking station function in a pre-OS environment:
• Enable External USB Port
• Enable Thunderbolt Boot Support
• Make sure the docking station is connected properly to its own
power adapter. Computer requiring more than 130 W power
input must also be connected to their own power adapter for
charging and operating at full performance.
• First power off the docking station by disconnecting the Type-C
cable and then removing power adapter from the dock. Then,
power on the docking station by connecting the power adapter
to the dock before connecting the Type-C cable to your
computer.
• The docking connector has become unseated from the
system's Thunderbolt ports. Please disconnect the docking
cable from the system, wait for 15 seconds or more, and then
dock again.
• The docking connector has become unseated from the
system's Thunderbolt ports. Please reseat docking connector.