RetailMeNot, a company that collates online deals for consumers, has released a report indicating that this month is a good time to buy a new TV, along with some other appliances - second only to the Black Friday weekend, in fact. This mainly applies to the US, as it cites factors such as President's Day sales and Super Bowl promotional events.
https://www.notebookcheck.net/February-is-one-of-the-best-times-of-year-to-get-a-new-TV-in-the-US-online-deals-company.402886.0.html