More likely the backlight consists of RGB LEDs and R, G have failed for a reason or another. Or, the signal chain has failed regarding R and G.
Very unlikely this is due to using white LEDs with slowly failed phosphors to the point image is completely blue. But of course, that's possible, too.
The fact that others have seen the same failure to the point it's a very common issue is interesting, because it should indicate someone knows the likely cause. This should make your life easier; Google further until you find an explanation from someone who actually investigated what's wrong. But obviously if you refuse to investigate and fixate into the initial idea of white LED phosphors failing like in one documented case in an LED lightbulb with external phosphors, then there is nothing we can do.
Fixation is a bitch. Airplanes have crashed thanks to fixation. I feel sorry for you, but good luck.