Another affected owner, LG C8 65", October 2018 assembly date. Personally, I think this overshoot affects the whole range, not just black to near-black, and has the side effect of greatly exaggerating content grain and noise. One of the first things I noticed about the C8 was that it seemed much grainier than the C7 I exchanged for it. I see another side-effect of this overshoot, sometimes eg a uniform wall in the background of a shot will be flickering. Most of the time though it's like a micro-flicker that you wouldn't even notice, unless you're specifically looking for it rather than focusing on the characters.
Regarding the near-black flashing specifically, I saw this on the second night. I then went to the avsforum owners thread, and into a barrage of criticism for bringing it up ('stop looking for issues', 'it's the content', 'you're just here to complain' etc). I'm well aware of tech and process limitations so my expectations were adjusted accordingly (I knew there may be some dark vertical banding and some tinting). However, this is an actual defect, which is something else entirely. After reading back through that thread, it had been brought up numerous times over many months. Some people in that thread were treated quite poorly for trying to discuss this very real issue.
Personally. the two most effective ways to mitigate this issue is with the use of madVR. The first is applying extra dithering - dithering to a bit-depth of 5bit practically eliminates this issue, at a cost of an almost imperceptible increase in noise. The second is the use of a 'fake' 3dlut, created with Displaycal. It's not quite as effective as the extra dithering (some minor flashing still in some scenes) but it is greatly reduced. The biggest benefit to the fake 3dlut is I can use a fake black level and apply a bt.1886 curve to overcome some black crush without using any of the TV controls (and therefore not raising the black level).
I haven't found an acceptable solution for streaming apps, other than to turn on a room light, so you can't see into the dark areas.
I have a meter and will calibrate properly, but I'm holding off in case LG have to swap my panel, or if they implement a firmware fix that would mean having to redo it.
Last edited by iSeries; 12-27-2018 at 05:24 AM.