To reset and arrange channels in the order, you must have its remote control. Check whether the remote control emits infrared emission. Check it with fresh batteries. Clean the battery contacts inside it batter compartment. If these contacts have any rust or dust accumulated, there will be no proper battery connection to remote's internal circuits, and won't work well. If all are found OK, check and replace the infrared sensor inside your TV. If you wish to get more details about how to check and replace a remote control,
check this link.
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