Hi,
Please do refer to this Microsoft Document on how to connect your TV to your laptop wireless.
http://windows.microsoft.com/en-ph/windows-8/project-wireless-screen-miracast
If these doesn't work, do try to uninstall/reinstall the graphics card driver first.
- Go to Device Manager and uninstall the graphics driver.
- Open Programs and Features and uninstalling anything related to your graphics card.
- Next is to download and install the latest driver from the manufacturers site.
- Once installed reboot your laptop then test it again after it reboots.