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Yes, the back needs to be removed and the main board slides out to gain access to the IR sensor. Usually, the sensor itself is fine, the connections can get broken. Try resoldering the 3 pins for the sensor first. That alone may resolve the problem.
it is easy to replace the remote if you are in the warranty ............the procedure is simlple take the serial number, make ,model number from the bill send it to the company and also scan and send the warranty card
I don't know of any adjustments for the IR receiver but the receiver itself could have gone bad or something may be blocking the IR lens not letting the IR signal get through.
Maybe (but unusual) there may be a cold solder joint in the IR circuit.
Sometimes dust will collect on the inside of the IR lens causing this problem.
You can verify the operation of your remotes by
holding them close to an AM radio receiver and pushing the buttons. You'll hear a popping sound through the radio speaker whenever a button is pushed. You may have to tune the radio up or down the band to pick up the remote's signal.