When I reviewed the Panasonic TC-PVT50 series
I was annoyed to see that the latest software update caused a banner ad to appear whenever I turned on the TV. It disappeared quickly and only popped up upon power-on, but it was still obnoxious. The first thing I wondered was whether I could turn it off.
Happily, Panasonic built in a way to disable the advertising. It's a simple, albeit buried, menu command. Here it is in a nutshell.