Green Line Appears Suddenly on Samsung 55RU7400 TV

I bought a Samsung TV with the model number 55RU7400 about three years ago, and a long green line appeared on the screen without any physical impact. Customer service informed me that a technical service could be sent, but that it would be charged. If a three-year-old TV suddenly develops this problem with no apparent cause, it's clear that there's a brand or panel issue. My father's Vestel TV, which he had for 7 years, and my LG TV, which he had for 5 years, had no such issues. I did some research and discovered a slew of complaints about Samsung TVs experiencing the same problem—a green line on the screen! Despite their higher price, Samsung TVs fail to inspire confidence in quality, leaving me disappointed.