How to make your hotel television, like LG TV, allow you to change inputs. Work around. Hack.

So many times, when I'm in a hotel, and I want to send a movie from my iPhone, iPad or laptop to the television set with an HDMI input, the input button on the side of the LG Television (maybe other brands?) doesn't work. Then, I've got to call down to the front desk, they send a maintenance man up to the room, to get the input button to work. A total pain in the neck. Here's what to do to get the "input" button to become operational. This is a "hack" and/or workaround.