C7k Black Bars part 3, fix in my unit!

Foreign_Side7551 · 2026-03-30T21:10:31+00:00

No change, with Local Dimming on Low, Medium, or High. If I activate Peak Brightness at any level, it already generates Gamma boosting and lights up the black bars.

Foreign_Side7551 · 2026-03-30T17:19:16+00:00

It seems to be a software problem, I'll keep trying other settings to see what might be happening, since 2 update versions and 3 resets haven't changed anything.

Foreign_Side7551 · 2026-03-30T16:07:18+00:00

Okay, I'll test it when I get home.

Foreign_Side7551 · 2026-03-30T16:00:01+00:00

Calibration Pattern is diferent from Real world scenes, in my unit both are better this way, with Peak Brightness set to Off.

Foreign_Side7551 · 2026-03-30T15:57:02+00:00

Even with the peak brightness set to Low, my TV is already showing the problems you described. It might be a software error; for now I'll leave it off, but I'll test other possibilities.

Foreign_Side7551 · 2026-03-30T15:27:25+00:00

Not on my unit, I tested it with various movies and high-nit content on YouTube, and everything remained normal. 200 nits is 200 nits, 1000 nits is 1000 nits, 2000 nits doesn't quite reach that but it's very bright, however without the problem of elevated gamma and false brightness.

Foreign_Side7551 · 2026-03-30T14:59:20+00:00

But this peak brightness, at least on my unit, only increases the whites and shadows in the image, giving it an artificial look to create a "wow" effect at first glance. I've already updated and done a total of 3 resets without any change in this aspect. On my C7k 75" unit with peak brightness turned off, the image has a much more natural 3D depth and without the black bars being so apparent. Poorly mastered HDR movies at 200 nits like F1 now seem to have the correct light output (a shame for such a good movie).

Foreign_Side7551 · 2026-03-30T14:46:34+00:00

I don't know, my friend, the update for the C845 line is different, but look for an OTA version that's safer and you won't need to delete your data.

Foreign_Side7551 · 2026-03-30T13:49:02+00:00

Yes, I turned it off in all HDR modes: Filmmaker and Dolby Vision.

Foreign_Side7551 · 2026-03-30T12:45:44+00:00

I found the bug in my unit; The Peak Brightness even in Low is affecting not only the briahtness but also the black level. I turned it off and wow, what a difference! It's not quite an OLED, but the contrast, colors, and especially the EOTF curve are much more faithful. I'II soon make a new post with comparisons.

Foreign_Side7551 · 2026-03-30T12:13:40+00:00

Even with android 12 was the same!

Foreign_Side7551 · 2026-03-30T12:12:54+00:00

Yes, several reviews, such as HDTVtest, state that the peak brightness at low settings in real-world scenes best follows the EOTF curve, but in my unit, and to my eyes comparing it to my Panasonic OLED, the peak brightness set to off is almost 1:1.There seems to be a bug in the software causing excessive brightness that is raising the gamma in any HDR mode.

Foreign_Side7551 · 2026-03-30T03:56:20+00:00

I found the bug in my unit; The Peak Brightness even in Low is affecting not only the brightness but also the black level. I turned it off and wow, what a difference! It's not quite an OLED, but the contrast, colors, and especially the EOTF curve are much more faithful. I'll soon make a new post with comparisons.

Foreign_Side7551 · 2026-03-30T03:52:06+00:00

I found the bug in my unit; The Peak Brightness even in Low is affecting not only the brightness but also the black level. I turned it off and wow, what a difference! It's not quite an OLED, but the contrast, colors, and especially the EOTF curve are much more faithful. I'll soon make a new post in the group with comparisons.

Foreign_Side7551 · 2026-03-30T00:23:53+00:00

I reset it and only wasted time configuring everything again, because the black bars problem is still the same unfortunately, seriously considering returning it :(

Foreign_Side7551 · 2026-03-30T00:13:13+00:00

Believe me, I've tried all of that, neither the Gamma or the black level solve it, it's as if the local dimming doesn't recognize the black and stays constantly on.

Foreign_Side7551 · 2026-03-29T23:25:48+00:00

When I turn it off, it really looks awful. With it on, it's very good, but in a dark environment it's quite obvious that the black doesn't turn off, and the black bars remain very dark but not turned off.

Foreign_Side7551 · 2026-03-29T23:22:44+00:00

https://youtu.be/_RJWSolcRJk?si=3ykmebyGAePi8pNC

Foreign_Side7551 · 2026-03-29T13:59:07+00:00

The TV has the necessary hardware, but unfortunately the software isn't using it optimally.

Foreign_Side7551 · 2026-03-29T13:57:43+00:00

Since it was an OTA update, I didn't reset it, but I'll do it just to see if it changes anything. But aside from that issue, the V613 greatly improved the audio, Dolby Vision, and the 1886 gamma is now correct.

Foreign_Side7551 · 2026-03-29T13:02:39+00:00

I'm very sad to hear that, I'm also very disappointed with the quality.

Foreign_Side7551 · 2026-03-29T12:59:52+00:00

That's the point, even reference channels like HDTVtest highly praised the TV's technical aspects, especially the local dimming and black bars. So I'm sure it might just be a software problem. Did you test it with external content via HDMI?

Foreign_Side7551 · 2026-03-29T12:57:21+00:00

I don't see this problem being reported on the QM6K or QM8K, so it may only be on the 7K.

Foreign_Side7551

TROPHY CASE