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It could be the remote itself or it could be something inside the TV. If you have an AM radio handy, tune it to a dead spot on the dial and turn the volume up. Place the remote next to the radio and press buttons on the remote. If the remote is putting out a signal, you will hear a constant, loud "pop-pop-pop" sound from the radio speaker.
If the remote is found to be working; the trouble will be in the TV. The most likely cause is the IR sensor inside the TV, the absence of B+ voltage to the sensor, or a problem with the system control IC.
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