Backlight scanning and/or strobing does not completely solve ghosting issues on LCD TV. I've played some 60 fps games on a 2013 X9 series Sony TV (in Impulse mode) and there was clear double images present for many color transitions. The VA panels used in televisions are not fast enough in all cases to completely switch pixel states between the strobe intervals.
I will also note that Plasma doesn't do much better. It's actually worse in some cases because of the increase in dither noise and high phosphor lag during high-speed motion.
Plasma has a high framerate and fast response time. It sounds like your problem is with LED. Burn-in is the real problem-- it would seem to be.