Just for the record this is a standalone post, not in response to any others in the thread, and is my own experience with more details to follow. This post is NOT intended to fan any flames.
I purchased my 55C7P from Best Buy in August 2017, calibrated it to my room using the 'Cinema' 'Technicolor' and/or 'ISF...' modes, have used it for regular TV and movie viewing and some gaming since then (lots of varied channels and content, no static logos/tickers) and have been very happy with it. It's got about 5000 hours on it, give or take.
In December I noticed what appeared to be the tv's mute icon clearly displayed on the right side of the screen during the red opening title screen of a Marvel movie. I paused the title screen to give it a closer look and discovered that all 3 "floating" mute icons were visible, the top and bottom being much more faint than the center one but still clear enough to see against the red background. And just to be clear I don't "watch the tv on mute" - I use mute over commercials and any other 'normal' time the tv needs to be muted for a minute or three. I also can't really get a clear photo of the issue, sorry.
I immediately ran the Pixel Refresh manually and checked again after it was finished. All 3 logos were still present so I repeated the PR
and again all logos were still present against red, orange and darker yellow backgrounds.
I called LG support today and they told me to run the PR
2 more times and if it didn't fix the issue to call them back. I'll be running the two PR
cycles today and I'll post follow-ups here as updates warrant.
EDIT: Added a photo. Did the best I could to capture what I'm seeing but I don't know much about photography or digital photo editing so while you can only barely see the top and bottom icons in the pic they are all much more pronounced IRL - I've outlined them with black circles in the pic. The photo was taken after another two PR
cycles (four total now, not counting any auto cycles that have run in the month since I first noticed the issue) and I'm going to call LG back in a while.