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Have you tried to unplug everything from your TV for a minute or so and changing the batteries in your remote? I had that problem once. After you do that, try to turn on the tv only with the remote and change the channel. If you are using more than one remote (i.e. a comcast cable remote and a tv remote at the same time the signals cross).
Is the remote a universal? Make sure you select TV as the the device you are trying to control. You can also fix a wonky remote by popping out the batteries and mashing down all the buttons. This rids the remote of any built up electricity that could be hampering functionality. Also, the remote sensor on the TV is controlled internally of course so a power drain of the TV wouldn't hurt:
1. Unplug the product's power cable so that the device is not grounded to the house. Do not simply turn off the power-bar if one is in use. 2. Press and hold in the products power button for 1 minute to release the retained electricity from the capacitors and circuit board.
3. Plug the product back into the wall outlet rather than a power-bar to rule it out of contributing to the problem and turn the device back on.
What do the buttons on the TV itself do? Do they work properly? If not, the problem is going hand-in-hand with the remote and again, the problem is internal and service or a firmware update, if available, may resolve this.
Bad filters on the main board or a bad AUX REMOTE jack on the back of the unit (also part of the main board) re the cause of this problem.
Try plugging in any jack that will fit into the AUX REMOTE jack on the back and then pulling it back out. This may fix the problem or remove any dust that may have collected in the jack. If this jack has something plugged into it (or goes bad) the TV will no longer have remote control operation (because it thinks an external remote box is being used). If this does not work then the main board will need replaced.
Note, many repair techs will think the IR board is bad (the Infra-Red Receiver board) at the front of the TV, but this is usually not the case with this model.