However, a demonstration suggests that the underlying problem in some sets could be surprisingly small. UK repair technician Allen Fleckney, who runs the YouTube channel TV Repair Community , claims one faulty light in an LCD backlight can leave the entire screen unusable. LCD televisions need LEDs behind the panel to illuminate the picture. According to Fleckney, software in certain models can detect a fault in that lighting system and prevent the backlight from remaining on. The owner gets a...