Dell Thunderbolt Dock WD22TB4 User Manual page 37

Table 18. Symptoms and solutions (continued)
Symptoms
18. When WD22TB4 dock has no power.
19. When WD22TB4 dock is not working even when BIOS,
firmware and drivers are up to date.
Suggested solutions
● Disconnect USB Type-C from the system and the
WD22TB4 power adapter.
● Re-plug the WD22TB4 AC adapter.
● WD22TB4 dock LED blinks 3 times.
Check BIOS/Firmware/Driver is updated.
If Yes:
● Restart the dock.
If Yes:
● Re-plug the docking AC adapter
● Restart the dock.
If Yes:
● Re-plug the docking AC adapter
● Restart the dock. If the dock does not respond
● Enable WD22TB4 display support matrix
● Restart the dock
Troubleshooting the Dell Thunderbolt Dock - WD22TB4 37