I ran into the same issue this morning. The power button would turn the TV on and off, but no other buttons responded. I power cycled the TV and repaired the remote but still nothing. After working with Samsung customer service (incredibly helpful), here's the fix: 1) turn the TV off; 2) take the batteries out of the remote; 3) point the remote at the TV and press and hold the power button on the remote (without batters) for at least 15 seconds; and 4) put the batteries back in and press the power button to turn the TV on. This resets the remote and restored it back to full use.
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