After 4 Years, My Samsung 49-Inch 4K LED TV Started Getting White Spots

I bought a Samsung 49-inch 4K LED TV four years ago, and recently I noticed white spots on the screen. I put it on the wall the day I bought it and haven't moved it since. When I called the service center, they charged me 250 TL up front and then told me the repair would cost 3100 TL. This is almost a third of how much the TV costs on its own. I can't afford to pay so much money every four years to fix things. Even if I fix it, I'm sure it will start acting up again in a few months. Should I have enough money to buy a new TV every three or four years? I need to be able to use it for at least 7–8 years without any problems. It's frustrating to have to pay so much to fix my TV, and it looks like I have no choice but to buy a new one.