you would have to remove the back cover and look for the sticker in the screen with its model and then look for a new screen by model. When you have the back cover removed, you have about 40% of the screen replacement behind you, only the frame remains (sometimes the frames are integrated and come with a new screen), the motherboard and the power supply to be translated.
Ask an authorized service center. A few years ago, I exchanged 42 inches in LG. And contrary to appearances, the price was very decent. I do not remember exactly, but probably PLN 550 (with labor), without losing the warranty.