Okay, I have some more information. Here's what I recently posted in the dedicated thread. I'm posting it here so someone searching the topic can find it more easily:
I should update you all about the intermittent thin red vertical line on my 65LW6500. It would appear some variable time after the TV warmed up. If you recall, I was able to make it stop by putting slight pressure on the rear of the set at the bottom of the line (the set was wall-mounted and tilted down). The line was a couple inches from the right side, facing the set.
I did some research and it seemed likely that it was TAB bond failure. It's a solder-less connection between a data cable and the panel. I even saw a few videos illustrating the problem on YouTube.
First of all, I'm sorry I don't have any pictures, but my wife had the camera that day.
Anyway, I took the TV down and laid it flat on the carpet. Removed the back, then attached the stand and stood it up. Then removed the bezel. Under the bezel are four metal angle bars, one each for top, bottom, sides. I removed the top and right side one before realizing that if I removed any more, the panel would fall out.
So I screwed the top one back on, since the data cables were not at top or right side.. The side angles wrap around top and bottom, overlapping the horizontal members. Anyway, removing just the right side angle reveals the rightmost data cable at the bottom. Very thin and gold colored. At this time I took off the bottom, just to see the other cables. There are 12 of them, each evidently passing data for 165 vertical lines of pixels. It looked to me that the rightmost cable was slightly longer than the others, and had a little crease in it, probably from the bezel pressing on the over-long cable.
I put the bottom angle back on for safety's sake, and turned on the TV. Then hooked up and turned on an external drive with MKVs, and played one.
Here's the thing: Just like in one of the YouTube vids I saw, putting a little pressure on the suspect cable (with the non-conductive handle end of a screwdriver) caused the vertical red line to appear. So, again as in the video, I made a little pad out of electrical tape and placed it behind the cable, just below where it connects to the panel and directly behind the crease in the cable. There's a narrow space there. Now, pressing against the cable did *not* make the line appear. Fingers crossed, I re-assembled the TV. I ran it constantly all weekend and it was fine.
The TV has been running with no problems whatsoever for a few weeks now. It is now in the living room (not wall-mounted). I confess the mirror-like screen finally annoyed me enough to put a 70" matte-screen Sharp in my HT. (My wife is much less annoyed by the mirror screen, and the lighting there is less conducive to reflections).
Anyway, there you are. I'd call this a band-aid rather than a repair, although from what I've been able to gather, in many cases it seems to be a permanent fix. Actual TAB bond repairs are so expensive it makes more sense to just replace the panel.