It needs to be Re-Paired to the TV.
First, fresh batteries, and clean battery contacts if needed.
Then, Try Pairing procedure:
Samsung remotes for LED / LCD TVs are generally RF, not IR.
Most Universal remotes do not generate RF signals, so disregard advice about codes for Universals.
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Good Luck !!
PAIRING and RESET buttons:
Within 3 feet of TV
SOURCE: my remote is not responding to the tv even i have changed the new baterry
Resetting the TV
If the buttons on the remote AND the buttons on the TV case do not work (channels do not change and you cannot open or navigate the menu), the TV has stopped responding. Reset the TV as follows:
NOTE:
Some TVs have a reset button. If available and accessible, try using the reset buttons before using the steps below. Using the reset buttons can save time. 
1. Unplug the TV power cord from the power outlet.
2. Unplug any connected devices (DVD, Set-top boxes, etc...)
3. Press and hold the TV power button for five seconds.
4. Plug the TV power cord back into the power outlet and turn on the TV.
5. Open the on-screen menu to confirm that the TV is responding again.
6. Turn off the TV and reconnect the devices.
7. Turn on the TV.
hope this may help;
Regards,
VOTIT
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