This is not an issue with your MWTV3 kit. If the following does not resolve your issue, please contact Apple.
With the Apple TV powered On, plug the Apple TV’s HDMI cable directly into the 1080P TV.
Wait until the 1080p TV shows the normal home screen for the Apple TV.
With Apple TV powered on, unplug the Apple TV’s HDMI cable from the TV.
Plug the Apple TV’s HDMI cable into the Transmitter’s Input Port (Do not power the Apple TV off).