How long should a flat screen TV last?
Also asked, how long should an LED TV last?
Even though the typical lifespan of a LED TV is around 80,000 hours, in reality it should last much more, as long as no other technical issues come up. Let's say about 6-7 years in very good shape.
Also asked, how do you know when your TV is going bad?
Dead pixels are a sign that the LCD grid is reaching the end of its useful life. Dead pixels will appear as dark specks much the same on a cellular phone or portable music player. Some dead pixels can also appear as white specks on a dark background, and may even have some color to them.
On the average flat-screen TV, repair of a cracked screen is one of the highest-cost repairs. Usually, on all but the biggest screens, it is more than the cost of a replacement TV. The screen of a larger TV costs more to replace, but the TVs themselves are higher-priced as well, so it may still work to your advantage.