Recently I bought 2 UD-3900 docks for my laptop:
- 1 for the office
- 1 at home
Both worked great for 2 months, until one of them stopped working 2 days ago.
- 1 is working OK
- 1 is not working OK (video output)
Exchanged the docks with the monitors attached:
- same not working dock: no video output anymore
- when I attach the dock with the video out problem: Windows 8.1 device manager reports an USB problem
- when I attach the good working dock, device manager does NOT reports an USB problem
My conclusion is a defect video chip.