Dell ThunderDock WD22TB4 - Manual (Page 37)

Table 18. Symptoms and solutions (continued)
Symptoms Suggested solutions
18. When WD22TB4 dock has no power. ● Disconnect USB Type-C from the system and the
WD22TB4 power adapter.
● Re-plug the WD22TB4 AC adapter.
● WD22TB4 dock LED blinks 3 times.
19. When WD22TB4 dock is not working even when BIOS,
firmware and drivers are up to date.
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