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
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