Ok, I've looked around, but can find an answer to my problem.
I have a Mitsubishi WS-65511. The TV has stopped responding to all remote commands, and the only button on the front control panel that works is the power. I can't change the input, channel, volume, etc. Once the TV is on, however, I have no other problems.
I took off the front screen to clean the lenses/mirror and noticed there was a small circuit board directly behind the affected buttons. What is this board, and can it be the culprit? Is this something that I can replace myself, or do I need a service tech?