Solved! I have a new Samsung Smart TV and bought Sony WH-RF400 wireless headphones. Won't connect...

Solution
You wouldn't get sound if the TV wasn't sending any to the transmitter.
The transmitter for those headphones has an analog audio input. Does you TV have an analog audio output? Most don't and the connectors for an audio input are the same as for an output.
If there is a TV audio output you may need to turn it on in the TV menu system.
If you change the channel on the base do you have to also change it on the headphones?
You wouldn't get sound if the TV wasn't sending any to the transmitter.
The transmitter for those headphones has an analog audio input. Does you TV have an analog audio output? Most don't and the connectors for an audio input are the same as for an output.
If there is a TV audio output you may need to turn it on in the TV menu system.
If you change the channel on the base do you have to also change it on the headphones?
 
Solution