Frank bought a Sony XBR 800e. Three weeks after his warranty expired, it started having trouble. Leo says that while the warranty is expired, it's close enough that if he calls them and pleads his case, Sony may be willing to extend the coverage and fix it, and it's likely just a tuner that's gone bad. The other option is to use a third-party tuner. Leo recommends a TiVo or Channel Master product.
From the Chatroom - The FCC has mandated that some local channels will need to change their frequencies. So you'll have to rescan your tuner to find the channels again. https://www.fcc.gov/TVrescan