I replaced my lcd panel today on my 1520, and I noticed that the keys weren't vibrating. So I went back to the settings to check if I had it was turned on, and it was. Is the lcd panel to blame, or it something else?
Since I kept getting my display to freeze every few minutes, I'm going to assume that it's the display's fault for the vibration on the keys. I'm going to be returning the display. Thanks for the info guys.