Originally Posted by VBB
Dave, that post is outdated. We have since come to the conclusion that Vizio TVs (going back to at least the 2014 P-series) simply cannot do a proper 4:4:4, no matter what. The EDID says they're capable, so you get it as an option in your video card driver, but the output always ends up being 4:2:2. Slightly blurrier than 4:4:4. That's what you're seeing with the test patterns. Black on white text won't look any worse, but certain other combinations will. Overall, this is not a big deal. It would be nice to have an explanation as to why the Vizios just aren't capable, though. Even the brand new P-series with its updated HDMI chips and newer panel can't do it.
Yeah, something strange is going on. I got the full screen, 1 pixel width test image from Post 6 of:
I've settled on this pattern as is is full resolution, pixel for pixel.
In the horizontal line, every other blue pixel line is about 1/2 to 1/3 as bright as next blue pixel line, no problem with the vertical lines.
End of the story. Returned Vizio, got 40" Samsung KU6300. passes every image test, true pixel by pixel reproduction. Text is maybe 10% better. There was a text reproduction meltdown in Excel that I never saw before, present with the Vizio, not present with Samsung.
EDIT - after a week with the Samsung, I've noticed far less eye strain when using it as a monitor.
Special thanks to Luke M, who started me on this learning experience.