Originally Posted by Nighthog
I've read about the HDMI Overscan being reported to Samsung support and forwarded to the technicians to look into so I hope they fix the issue for next update. A bug report has been issues by a few people around the internet. I hope they don't break anything else when if they fix it.
I have Samsung's "ear" on this issue, as it were. Someone knowledgeable from Samsung is supposed to be getting in touch with me. And it's good that they will, because even though the problem is indeed fixed to the extent that I previously suggested, there remains one issue.
First I should mention that when I had the port labeled as "Game Console", every refresh rate setting caused the video to exhibit crosshatch dithering
. It's a very annoying visual anomaly where every other pixel, both horizontally and vertically), assumes a slightly brighter / slightly darker pattern. I had thought at first that the Q70R didn't suffer from it, but I was wrong; it appears whenever the display is accepting and displaying HDR, for example, and this also helps explain why every single Samsung at the local Best Buy exhibits this dithering.
Fortunately, I hit upon another bug with this TV. I renamed the port back to "PC". For reasons only Samsung's TV software engineers could really answer, I still don't get the zooming bug; it's as though temporarily labeling the port as "Game Console" permanently set a flag that the TV was needing all along. So now my situation is this:
When using 29, 30, 59 or 60 Hz (and no HDR), I get a "clean"* image with no zooming. When using 23, 24, 25 or 50 Hz (and/or HDR), I get crosshatch dithering, but still no zooming. However, because I had to rename the port back to "PC" to achieve this final result, I again lost the ability to set Picture Mode to "Movie".
This may be the best this TV can manage. But I'm going to hold onto some hope that when I bring the dithering issue to Samsung's attention, they will in fact have some way of disabling it. After all, I can display 4K60 4:4:4 without having to deal with it.
Now, to clarify what I mean by "clean" in quotes: No Samsung TV actually provides WYSIWYG. Plenty of other makers have no problem with this, but Samsung TVs use a kind of vertical dithering which manifests as horizontal lines of a subtly-alternating brightness. You can see it most readily on solid colors, such as cyan
. For PC use, this phenomenon is without question worse than even 4:2:0 color. And it causes some weird anomalies. For example, have a look at this portion of the Belle-Nuit chart
. The area up-right from the "1". You may need to zoom out to see what's going on. Those two rectangular areas there are supposed to be identical; the only difference between them on a pixel level is that one is vertically offset from the other by a single pixel. And yet on a Samsung TV, that makes all
the difference; you can plainly see that it has literally caused the colors to change. One is visibly more orange than the other.
I'll be bringing these issues up with the Samsung tech as well. Not with any hope that they can somehow make it vanish from their current lineup, but as evidence that people are onto them, even if sites like Rtings willfully ignore flaws such as these.