u/JeanisGoWild

I want to share something that I think most TCL C7K/C8K owners — and probably many Mini-LED owners in general — have no idea their TV is capable of.

The usual complaint is easy to understand: in HDR movies, and especially in Dolby Vision, CinemaScope black bars can sometimes look gray instead of black. On one film they may look excellent, and on another they suddenly lift, glow, or become noticeably visible. In my experience, Dolby Vision often made this behavior worse rather than better.
What changed my perspective was realizing that this is not necessarily a bad panel. It is mostly a Mini-LED behavior problem, not a simple hardware defect. OLED controls light at the pixel level, while Mini-LED LCD controls groups of pixels through dimming zones, so when a bright HDR highlight appears near the top or bottom of the image, the TV may light up a zone that partially overlaps the black bar.
That is why black bars on Mini-LED can change from scene to scene. It is not only about the number of zones. It is also about the local dimming algorithm, tone mapping behavior, LCD light leakage, light diffusion through the panel layers, and even the way the human eye perceives haloing around bright objects.

The biggest surprise for me was that firmware behavior matters enormously. The same TV can look disappointing with one combination of settings and shockingly good with another. Once I started changing the local dimming strategy, peak brightness behavior, black level, gamma, and the source output format, the black bars became dramatically darker and the image became much more cinematic.

My final solution will sound crazy to some people: I chose Apple TV as the source, locked it to HDR10 behavior, and deliberately gave up both proper SDR handling and Dolby Vision. Yes, that is a compromise. But for my eyes, it was the only way to get this TV as close as possible to the kind of night-time image quality people normally associate only with OLED.

Why did I do that? Because I wanted control and consistency. I did not want the source device and the TV constantly switching behavior depending on the app, the title, or whether Dolby Vision metadata was present. I found that once Dolby Vision entered the chain, black bars were often less stable, the black floor could rise, and the image could look less convincing in a dark room.
So yes — I made a conscious sacrifice. I gave up the purity of SDR. I gave up Dolby Vision. And I did it because the result was worth it: darker black bars, less blooming into the letterbox area, a more stable image, better shadow perception, and a picture that finally started to feel truly cinematic at night.

That is the part I think many people do not understand about modern Mini-LED TVs. These displays are usually praised for daytime brightness, but most users never discover how close they can get to an OLED-like experience in a dark room when they are configured correctly. Not equal to OLED, not pixel-perfect, and not magic — but far closer than most Mini-LED owners imagine, and honestly closer than many OLED owners would probably expect too.

That is why I see the TCL C7K/C8K as a hidden gem. During the day, it can beat OLED in the ways everyone already talks about. But at night, with the right setup and the right source strategy, it can become something most owners never realize they already have.

For me, Apple TV was not about convenience. It was a tool to force a behavior that the internal app ecosystem and automatic format switching would not reliably give me. In other words, I sacrificed format purity in order to gain image consistency — and that trade brought my Mini-LED closer to the look I had been chasing all along.

My current baseline settings:
• Picture Preset: Movie
• Brightness: 100
• Contrast: 100
• Black Level: 48
• Gamma: 1.8
• Dynamic Tone Mapping: Detail Priority
• Dynamic Contrast: Off
• Black Stretch: Off
• Local Dimming: Medium
• Peak Brightness: Low
• Local Contrast: Off
• Dynamic Brightness: Off
Apple TV approach:
• Fixed HDR10-style output
• Match Frame Rate: On
• Match Dynamic Range: Off
• Goal: avoid Dolby Vision takeover and keep image behavior more consistent