LG C8 screen uniformity
In the process of returning an LG C8 55", the second set I've tried. First one had a bright stuck pixel, or possibly several, the size of a pinhead, that could be seen in almost any scene at 15' away. Returned the next day after a manual pixel refresh did nothing. Sent it back before I knew of any uniformity issues, but certainly nothing noticeable like the second C8. Besides the very annoying stuck pixel(s) the picture was impressive, so I went for another one.
Just over 200 hours on this second set (no gaming, no news channel, streaming is main content) noticed very early some picture quality issues, but wanted to let it settle, as advised here and other places. The uniformity issues never changed enough to notice from coming out of the box. Tested on all inputs with multiple sources (including B-Ray disc) and internal apps with no change. Followed the settings from the first post in a dark room for the second set:
First three pictures of factory pattern IRE 5, 10, and 15 respectively pretty clearly shows uniformity issues to me, with black/dark cloudiness in the upper right corner. Also has that strange circle/bug artifact at the bottom (but not seen in content,) right of center, and there's a faint one in the same position but left of center, maybe lost in the lighter part of the screen during a picture. Almost looks like something from manufacturing? There's some banding in there which I don't seem to notice in nearly any content, but the uniformity issues may be hiding it.
The brightness in the lower left creates weird artifacts at 50 brightness in normal viewing like pictured in the the last two photos (Dark Knight, 6:22 and 6:33.) Notice the "double ladder" of brighter pixels in the left side of the letterbox, this goes all the way up the screen to the top. In addition there is noticeable noise in darker scenes in this corner, and dark scenes can show some stage lighting (?) from the left side of the screen as well. Meanwhile, very limited definition of shadows in the upper right, and increasing brightness has the obvious effect of washing out the rest of the screen.
I fell like I'm crazy to go for a third but that picture I saw on the first one (minus stuck pixel) and on a friend's C8 (such depth in the picture compared to LCD) makes me want to spin the wheel...