[UPDATE] Samsung repair technician cracked my TV and is refusing to take responsibility. They ended my warranty 4 months early due to the damage.
I had to get my 77" S90D (QN77S90DAFXZA) repaired after the power supply blew. Luckily, within the 12-month factory warranty. Turns out it got absolutely manhandled by the technician. Later that night, we noticed this black splotch on the display. To no surprise, the screen was cracked with the technician's greasy handprint right over the damage.
After two weeks of waiting, a technician came out and showed me a blurry picture of the home page that the first technician took on his way out. Because of that image they are not claiming responsibility, despite it being in 480p, with a chunk of the TV cropped out and being of the literal home page with a 75% black screen. (Image in video) Hence, canceling my manufacturers warranty due to physical damage and quoting me a $1700 repair bill.
I am waiting for calls back from supervisors at Samsung and Servicequick. I am genuinely tempted to file a civil lawsuit.