I just got my Samsung replacement LCD, I swapped it, and I too have the pinched vertical black line, and I have a centered horizontal lighter area, as well.
The sparklies are not as bad on this one however, and the ability to jump between those two dim settings that the LG could not, is much more of an advantage.
I do have some light leakage on the bottom and lower corners...
Again, I'm not really sure what to do with this as of yet, but I think I'll give it a week or so, and see how it feels.