Point the Smart Remote at the remote control sensor on the TV. On most Samsung TVs, the remote control sensor is located on the lower right hand side of the TV. If not, it is directly in the bottom center.
Next, press and hold the Return and Play/Pause buttons simultaneously for at least 3 seconds. Your TV will begin syncing with the Smart Remote. Then a message will appear, indicating that the remote is now connected to your TV.
also fresh batteries if that does not work and then try again. my girlfriend's brothers tv remote does this all the time. idk why but it does. one time I had to take batteries out of remote unplug tv cord from tv and from wall wait 5 minutes connect everything back up and then it worked again.