1-10-2020
I had the same problem. I bought it when it was released and have always kept it clean and in a safe spot on top of my dresser. It was untouched for months until I wanted to replay BotW. I went to the game and the only button that worked was Home. So I researched and came here for answers.
After I cleaned the screen the only buttons that worked were, Home, TV, Power, and B.
So I unscrewed the back of the gamepad, removed the battery for 30 secs, unplugged the power cord to the console, but nothing worked…UNTIL after trying to touch the BotW thumbnail for like 30 times, it finally reopened the game, and I was able to use all of the buttons.
My only problem now is that the gamepad keeps switching back and forth from the TV. I kinda gave the screen a massage with my fingers and it stopped switching.