Felt compelled to comment on this old thread just to say thanks. My 6-year old LNT4661F started having black lines and a darkened section at the top of my screen. Bought this at $1500 back in the day, so it was annoying that it failed in only 6 years. Since it was my parent's TV at this point, we replaced it with a slightly bigger Vizio (for $350). And so that Samsung TV sat there.
I found this a few months ago, but didn't have the time to actually attempt this repair. After removing a bunch of screws to reveal the tab bonds, I was able to get rid of the lines by putting pressure on the center tabs.
I should point out that I screwed up during the disassembly process. There is a variable resistor on the top of the TV, right underneath the metal frame that hides the tab bonds. I managed to shear it right off the PCB when manipulating the frame. Without it, the screen turns completely white, but words are still slightly visible. Luckily, I was able to solder it back on and everything is fine now. I now have an extra 46" TV that I can put in my room!