[futhey]

I'm being pedantic but I liked your comment. Most TVs today are giant ARM computers, ~95% of TVs ship with ARM Cortex but only about 35% have some variant of Android.

Most LED backlights are wired in such a way that when one LED fails it bricks a significant portion of the panel backlight. You'll knock out entire rows or huge portions of neighbor backlight LEDs when one fails. Basically it's a cheap way to ensure a whole row of LEDs are the same brightness but the tradeoff is one LED fails and it looks like 5% of your screen went dark.

It seems like a good beginner-intermediate thing that'd be approachable to learn with a basic multimeter and beginner level soldering skills.