There are multiple threads with many posts on the Miracast/WiDi problems on Windows 8.1.
Is there a wiki or similar page that summarizes the problems and potential solutions?
I'm also unable to get it to work on:
Windows 8.1 + Update 1
HD 4000 graphics
2230 WiFi
Latest drivers/software for the above
Sony W653 TV with latest firmware
The furthest I was able to get is to see "Add wireless display" in the Charms/Project menu. I could also find and add the TV from "Devices and Printers".
But when selecting the display in the Charms/Project menu I would get something like "Unable to connect".
I can't completely rule out a problem from the TV side because the setup process and usage there is also cryptic, as well as underdocumented, but since the TV hardware and software are fixed, and seeing all the problems reported here on the forum, I tend to believe the computer side is to blame.