All trouble shooting suggestions in manual
If the selector button on the unit AND the corresponding button on remote has no effect, then the problem lies with the digital circuit responsible for changing inputs and not the Remote or the selector knob on unit.. I am assuming that the other functions do work.
That puppy needs to be repaired unless you can live with the input that it is stuck on. U might try unplugging the unit for a while and then replugging it. On some newer models this "reboots" the electronics and restores operation
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