Again, I'm not experienced with that particular device.
My Sony Bravia TV just shows up as a device in...... Control Panel\All Control Panel Items\Devices and Printers when it is turned on.
And then I can browse to any video file on my computer, right click and choose "Cast to".
Have you check device manager you may have to use the View menu to show hidden devices. Scan for hardware changes.
Does the device show up there, under Digital Media Devices?
Does the device require a firmware update to function properly?
Have you ever had it working?