[dmos62]

Pretty cool, but you could instead replace the LEDs.

[1-6]

Sourcing the LEDs, disassembling the panel, and re-soldering each LED is not scalable. The solution mentioned in this article can be open-sourced and distributed to the masses.

[kasabali]

Leds are sold as plug in bars. there's no soldering involved. taking out the panel safely is tricky, though.

[MrBuddyCasino]

I did this once, was pretty easy. The backlight color had turned completely blue. The strips can be bought as spare parts and swapped easily without any soldering. The hard part is finding out the parts number of the LED strip for the particular TV.