Hello!
You should check first if the IR sensor (Infrared sensor) of your TV is still working. It is beside the pilot lamp to where you point the remote to control your TV.
Use the camera of your phone or your digicam to check if IR sensor is still working.
Looking on the IR sensor of your TV via the camera of your phone or digicam, if the IR sensor is working you should see it illuminates. If not, then IR sensor or its sensor board is deffective.
The best way to fix it is to bring it to a certified technician to replace the whole IR sensor board.
Good Luck!
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