TCL C855 vs LG OLED G6 (G64LW, G66LS)

Direct comparison

C855 / C85

G64LW / G66LS

Info

Available screen sizes: 65”75”85”98”

Available screen sizes: 55”65”77”83”97”

Panel type: LCD VA

Resolution: 3840x2160

System: Google TV

Model year: 2024

Complete the survey to find out the result

Panel type: WRGB OLED

Resolution: 3840x2160

System: WebOS

Model year: 2026

Complete the survey to find out the result

Overall rating

7.6

8.7

  • Movies and series in UHD quality

    7.5

    8.6

  • Classic TV, YouTube

    7.1

    8.7

  • Sports broadcasts (TV and apps)

    6.7

    8.6

  • Gaming on console

    8.8

    9.5

  • TV as a computer monitor

    8.6

    8.7

  • Watching in bright light

    7.4

    8.2

  • Utility functions

    6.7

    8.5

  • Apps

    9.6

    9.1

  • Sound quality

    7.2

    8.4

Advantages

  • Very large number of built-in applications

  • High contrast and deep blacks

  • Very good HDR effect in bright scenes

  • Very high brightness - great TV for bright rooms

  • Image quality comparable to much more expensive televisions

  • Perfect black OLED

  • High brightness HDR and SDR

  • Great anti-reflective coating

  • Reference colours (after calibration can be displayed just like on director's equipment)

  • Full support for gamers (HDMI 2.1, 165 Hz, VRR, ALLM)

  • Low Input Lag (below 5ms)

  • Smoothness and sharpness in motion

  • Outstanding upscaling and image processing

  • Full support for Dolby Vision

  • Functional webOS system with Magic remote control support

  • 5-year warranty on the panel included

Disadvantages

No like
  • Poor viewing angles

  • Poor factory colour reproduction (can be improved with calibration)

  • Very annoying dithering – graininess and flickering of the image close to black

  • Worse (though still good) viewing angles than its predecessor

  • Lack of support for DTS:X audio codec (useful for Blu-ray owners)

Our verdict

Once again, the manufacturer shows that despite being a relatively young player in Poland (but not globally) when it comes to the RTV market, it certainly cannot be said that it is a second-rate choice. The TCL C855 is an incredibly versatile device that performs well in various applications and excels in its price range. Thanks to Mini LED backlighting, the results for contrast and black levels are very solid, allowing for a deep and vivid image. It is worth noting that the television's algorithm effectively manages to maintain uniformity of blacks, and the blooming effect is rarely noticeable. This backlighting is also a strong point for the television in HDR content, although with some reservations. The TCL C855 can achieve brightness levels of up to 1800 nits, which is an impressive result; however, brightness can drastically drop, even to around 200 nits, when a bright but small element appears on the screen. Another drawback is the boosted mid-tones, which can lead to a loss of contrast and reduce the image's alignment with the director's vision. The television also performs excellently when connected to a console or a powerful PC. In this category, the TCL C855 truly shows its strength, offering extremely low latency and high-quality gameplay, thanks to the full implementation of HDMI 2.1 features. The Google TV operating system is another advantage, providing the user with nearly unlimited possibilities for installing applications, even those outside the official store, thanks to support for APK files.

In summary, the TCL C855 is the ideal choice for those who know what they expect from a television. It is a good, versatile piece of equipment that, although not perfect, offers great picture quality, low gaming latency, as well as a flexible and expanded operating system.

Without a doubt, the LG G6 is an outstanding television in many aspects. Thanks to the new generation 2 Tandem OLED panel, it does something that no other glossy screen on the market has managed so far – it superbly suppresses light reflections while maintaining perfect, unblemished image quality. When we add record brightness and the unique properties of the panel itself, the G6 can produce images that can literally knock you off your feet at times. The excellent webOS system and features for gamers further reinforce the belief that it is a worthy successor to the G5 model. However, this is only one side of the coin... because in a device of this class, the expectations are the highest they can be. During detailed testing, we encountered issues with digital image processing in scenes close to black. We're talking about overly aggressive dithering and slight flickering of details in dark sequences. Although during normal viewing from the couch this flaw does not stand out drastically and does not negate the overall admiration for the contrast, a trained eye will easily notice that LG's engineers stumbled at the last hurdle during the panel tuning. When buying a pretty expensive flagship product right here and now, perfection is simply expected from the first turn on.

Despite this obvious blunder, the LG G6 is still absolutely at the forefront of the market and one of the most interesting televisions of this year. It has a solid foundation to become the ultimate screen. We firmly believe that the manufacturer will quickly diagnose the problem and release an appropriate software update – if that happens, the competition will again have nothing to look for. We promise to keep monitoring the situation continuously, and as soon as a patch appears, we will definitely verify its effectiveness.

TV appearance

HDMI inputs
2 x HDMI 2.0, 2 x HDMI 2.1 (48Gbps)
0 x HDMI 2.0, 4 x HDMI 2.1 (48Gbps)
Other inputs
RCA (Chinch)
IR (remote)
Outputs
Toslink (Optical audio), eARC (HDMI), ARC (HDMI)
Toslink (Optical audio), eARC (HDMI), ARC (HDMI)
Network Interfaces
Wi-Fi 2.4GHz, Wi-Fi 5GHz, Ethernet (LAN) 100Mbps
Wi-Fi 2.4GHz, Wi-Fi 5GHz, Ethernet (LAN) 100Mbps
Build quality
Premium
Super Premium
Stand type
stand-type-
Central
Bezel color
Graphite
Silver
Stand
Fixed
Flat design
No
Yes
Accessories
Stand
Wall bracket

Contrast and black detail

8.6/10

10/10

Local dimming function: Yes, number of zones: 1344 (48 x 28)

Contrast:

Review TCL C855 Contrast and black detail

Result

:1

Review TCL C855 Contrast and black detail

Result

176,000:1

Review TCL C855 Contrast and black detail

Result

54,000:1

Review TCL C855 Contrast and black detail

Result

30,500:1

Review TCL C855 Contrast and black detail

Result

13,700:1

Review LG OLED G6 (G64LW, G66LS) Contrast and black detail

Result

:1

Review LG OLED G6 (G64LW, G66LS) Contrast and black detail

Result

:1

Review LG OLED G6 (G64LW, G66LS) Contrast and black detail

Result

:1

Review LG OLED G6 (G64LW, G66LS) Contrast and black detail

Result

:1

Review LG OLED G6 (G64LW, G66LS) Contrast and black detail

Result

:1

Halo effect and black detail visibility:

Check the visibility of bright lights on a dark background. Mini-LEDs often struggle with this. The photo does not compare black levels – that’s what the video below is for.

The video accurately shows differences in contrast and black levels between TVs, as well as potential issues: halo around bright objects or Mini-LED zone operation visible as brightness jumps.

TCL C855 uses a high-contrast VA panel. The ANSI contrast (without dimming) reached a very respectable 5238:1, which allows for at least very good black levels. Additionally, the panel is equipped with multi-zone Mini LED backlighting, which is divided into 1344 independent dimming zones for the 65-inch model. This number allows for very good results in our tests. It is worth noting that TCL, as one of the few manufacturers, offers such a panel specification without spending excessively, unlike the classic big four manufacturers. As you can see, in the vast majority of scenes we've prepared, the results are impressive, particularly in the first three scenes, as even in the third, with a result of 54,000:1, it cannot be said that the black levels and contrast are weak, as they are more than satisfactory. These worsen in two scenarios: scenes with film strips and when there are many elements surrounded by black on the screen. And just as the last of the test scenes still has excellent contrast, in the final tested scenario, a slight blooming of blacks can be noticed. The frame from the film "Oblivion" performed excellently on TCL C855, and the level of black can even be compared to OLED screens, which is no small feat. It is also worth noting the good separation of lights, which is not an easy thing to achieve. Our flagship scene from "Sicario 2" also performed well in terms of contrast, but it is evident that details are lost in the blacks on the first, second, and third planes. The operation of the backlight control algorithm, which minimizes halo/blooming effects to an absolute minimum, deserves praise as well. However, it is worth noting that very small elements, such as stars, can sometimes be completely dimmed by the TCL C855.

As the LG G6 is based on OLED technology, specifically the WOLED TANDEM 2nd gen matrix, when it comes to black levels and contrast, we’re talking about perfection, which is confirmed by our lab measurements – in every test scenario, the TV achieved an absolute infinity mark. The ability to independently control each pixel gives it a significant advantage over any LCD panel on the market. This translates to a brilliant, plastic depth of image that immediately pulls you into any possible viewing experience. This is clearly visible in the example of a dark, challenging scene with a helicopter from the film Sicario 2. While traditional screens with local dimming (including Mini-LEDs) can generate an annoying “halo” effect in such moments, lighten black bars in films, or lose details in the shadows, the LG G6 handles it flawlessly. Black, where it needs to be black, remains pitch-black and perfectly separated from bright points.

*A small note: during this test, a quite strong grain and flickering of the image are noticeable. However, we do not take this into account when assessing the contrast itself and this part of the review – we will describe this specific issue in the further section. Paragraph: "Smoothness of tonal transitions".

HDR effect quality

6.6/10

9.1/10

Supported formats
HDR10, HDR10+, Dolby Vision, Dolby Vision IQ, HLG
HDR10, Dolby Vision, Dolby Vision IQ, HLG
Color gamut coverage
DCI P3: 97.0%, Bt.2020: 79.0%
DCI P3: 99.5%, Bt.2020: 83.9%

Luminance measurements in HDR:

Review TCL C855 Brightness measurement

Result

1472 nit

Review TCL C855 Brightness measurement

Result

445 nit

Review TCL C855 Brightness measurement

Result

754 nit

Review TCL C855 Brightness measurement

Result

237 nit

Review TCL C855 Brightness measurement

Result

1820 nit

Review LG OLED G6 (G64LW, G66LS) Brightness measurement

Result

2387 nit

Review LG OLED G6 (G64LW, G66LS) Brightness measurement

Result

2345 nit

Review LG OLED G6 (G64LW, G66LS) Brightness measurement

Result

2418 nit

Review LG OLED G6 (G64LW, G66LS) Brightness measurement

Result

2439 nit

Review LG OLED G6 (G64LW, G66LS) Brightness measurement

Result

1844 nit

Scene from the movie “Pan” (about 2800 nits)

Scene from the movie “Billy Lynn” (about 1100 nits)

The photos show two HDR10 movies. 'Pan' is one of the brightest productions ever made, while 'Billy Lynn' (soldier) has brightness typical of streaming (Netflix, Prime, HBO MAX). Notice the intensity of effects and detail in whites.

Static HDR10

The photos present the visibility of white details in various HDR formats. They do not show brightness differences between TVs (these can be compared in the previous gallery).

Dynamic: Dolby Vision

Dynamic: Dolby Vision

The photos present the visibility of white details in various HDR formats. They do not show brightness differences between TVs (these can be compared in the previous gallery).

HDR luminance chart:

LG OLED G6 (G64LW, G66LS)

TCL C855

Luminance of RGB colors

TCL C855 delivers a highly varied HDR effect. On one hand, the television truly shines, while on the other, it resembles a lower model with FALD backlighting. Such a state of affairs is regularly observed with this brand, so it was not a surprise for us. The first and last scene, which has large light elements, looks phenomenal, "shining" with brightness levels of 1470 and 1820 nits respectively. Such effects will certainly make many people squint, while simultaneously feeling the extraordinary dynamism of the scene itself. You can truly feel as if you were inside the movie. The situation drastically changes when small or minor elements with high luminance surrounded by black appear on the screen. The TCL C855, to avoid the halo effect, significantly reduces brightness to a level of even 240 nits, which is a disappointing outcome, causing the film to not look like it was shot in HDR. The HDR effect in TCL C855 makes watching dynamic scenes more engaging, and the viewer can feel like they are part of the action. Even with smaller elements of high luminance, the television manages to maintain details without excessive dimming. Moreover, the TCL C855 test shows that the brightness of the image is adapted to scenes with a large amount of detail, increasing viewing comfort.

The LG G6 is currently one of the brightest OLEDs on the market. Its peak brightness reaches nearly 2500 nits and, best of all, this translates directly to real movie scenes. The TV flawlessly extracts details in the bright areas of the image. And this is regardless of whether we are talking about very small points in the form of stars in the sky or slightly larger elements on the screen. Naturally, with full-screen, uniformly white scenes, the brightness of the G6 drops due to the panel protection system (ABL). However, in real, varied movie shots, this value still hovers around an impressive 2000 nits, which can be considered a remarkable result. The coverage of the color palette also deserves praise. The new 2nd generation Tandem OLED panel has brought about only a cosmetic change, but still an improvement. The coverage of the DCI-P3 color space reaches nearly 99.5%, while the ultra-wide BT.2020 is around 84%. These are very good results, although it's important to remember one thing: at extremely high brightness levels, the volume of colors will be lower than in QD-OLED panels from Samsung Display due to the use of white sub-pixels (WOLED). However, in everyday content and most films, capturing this difference will be very difficult.

Factory color reproduction

5.2/10

7.4/10

This gallery shows how colors change after professional TV calibration. If you notice the difference, we recommend ordering this service at SkalibrujTV.com.

Factory Mode

After calibration

This gallery shows how colors change after professional TV calibration. If you notice the difference, we recommend ordering this service at SkalibrujTV.com.

Factory Mode

After calibration

The best factory mode for the TCL C855 is "Film," and it is on this mode that we conducted all our tests. However, like every mode predefined by the manufacturer, it had flaws that are worth correcting to achieve an image that is as close as possible to what the film producer intended. We will look at the colour characteristics in both SDR and HDR materials. Taking the former into account, we see a clear dominance of green in the white balance, which, as you might guess, gave an unpleasant greenish tint to the entire image. Examining a very important gamma chart, responsible for the contrast of the image, we see a significant deviation from the reference line marked at 2.4. From the left, we can observe a strong spike in the measured value, which at this point caused contrast exaggeration and blending of details into a dark blob. This state of affairs persisted for quite a while, up to 20% of the chart’s value, before then diving below the reference. This, in turn, meant that the image was brightened and contrast decreased significantly. The factory mode performed somewhat better in HDR materials, as the white balance looked quite good, except for the second half, where green again took over. Looking at the EOTF curve, which, unlike gamma, shows the rate of brightness increase, we see primarily two errors: the darkest scenes were too dark, and the brightest ones were overexposed. This, by the way, could be observed in the scene from the film "Pan" in the check paragraph for the TV's HDR.

We tested the LG G6 in the best factory mode for colour fidelity, which is FILMMAKER MODE. In the case of our test unit, this mode was reasonably well tuned straight out of the box. In SDR content, the only issue we noticed was the white balance, which leaned towards warmer tones. This made the image occasionally appear slightly yellowish, but overall, it wasn't a significant problem. The G6 performed a bit worse in HDR content. There, the white balance showed too much blue component. This caused the image to veer towards cooler shades, resulting in quite noticeable errors. As can be seen on our ColorChecker chart, the colours shifted towards these cooler registers. Nevertheless, considering the factory settings, the television presented a perfectly decent level. However, we know that OLED screens – particularly those from LG – respond exceptionally well to professional calibration, so we immediately proceeded to do just that.

Color reproduction after calibration

6.9/10

9.2/10

The photos show how movies look on the TV. Pay attention to black detail visibility, colors, and shadow tint.

The photos show how movies look on the TV. Pay attention to black detail visibility, colors, and shadow tint.

TCL, just like the vast majority of manufacturers, provides advanced calibration tools in its televisions. Here we find 2- and 20-point grey scale adjustments as well as an advanced colour management system. The results, as you can see, are very good and in SDR materials we have significantly approached the reference image. We eliminated both the green tint and the gamma issue, although there is still a slight "kink" at the very beginning. It went a bit worse with HDR materials, which the television ChooseTV C855 did not allow us to model properly. We only managed to slightly adjust the EOTF curve and significantly improve the colours themselves.

After completing a professional calibration, we gained complete control over the panel, and we managed to align all parameters to nearly zero. We were able to tune the white balance perfectly, which removed the factory's cool and warm tints from the screen. The effects are visibly clear in the ColorChecker test – the average colour reproduction errors dropped below the critical value of 1-2. And what does this mean? PERFECT colours, without any distortion! However, as a reviewer’s duty, we must point out how the LG G6 arbitrarily manipulates brightness, which is due to the EOTF curve's behavior. When we look at the standard synthetic graph, it might seem that the line is quite straight. However, the situation changes when we turn on the measurement filter, which shows how the television interprets brightness in actual, moving film scenes (EOTF in MOVIES). Then, it is clear as day that some of the smallest fragments on the screen are slightly overly brightened by the algorithm. Of course, for the average viewer, such a deviation will practically go unnoticed, but in the test of such an expensive screen, it’s worth noting – especially since we are talking about a model that has huge aspirations for the title of the best television of the year.

Smoothness of tonal transitions

9.2/10

5.5/10

These are selected scenes that show smooth tonal transitions from one color to another. If you see distinct banding, it’s the TV panel’s fault.

These are selected scenes that show smooth tonal transitions from one color to another. If you see distinct banding, it’s the TV panel’s fault.

These are selected scenes that show smooth tonal transitions from one color to another. If you see distinct banding, it’s the TV panel’s fault.

These are selected scenes that show smooth tonal transitions from one color to another. If you see distinct banding, it’s the TV panel’s fault.

Nevertheless, an important aspect in assessing image quality are tonal transitions. To achieve a clear image free from posterisation effects, the television must demonstrate very good algorithms for smoothing out colour gradation. We must admit that the applied feature in TCL C855 called "Gradual Smoothing" is one of the better ones we have had the opportunity to test. Practically every scene performs very well here, and nothing can be faulted. The best example of this is the scene from "The Green Knight", which is the most demanding due to the vast number of fine and subtle transitions in the fog. The C855 effectively smooths everything present in the scene and allows the viewer to experience its entire suspense. The only moment where a slight posterisation can be noticed is in a frame from the film "The Green Knight", where the reds in the top left section of the screen contrast against each other.

Unfortunately, we arrive at the least cheerful part of this review. If we were to evaluate solely the fluidity of tonal transitions, the G6 would score high marks. The blending of colours is at a very good level, and at times it resembles what we've seen from Samsung's QD-OLED panels. This is great news because until now, unsightly, layered bands in dark shades have been the bane of WOLED panels. In this category, we would easily give a strong 8.5 out of 10.

Note: Unfortunately, the final score in this section drops significantly, and the culprit is very aggressive dithering. In dark scenes, the image literally "shakes," and in areas close to black/dark grey, the television can flicker annoyingly. We don’t know exactly what this is due to, but looking at the tests from other reviewers around the world – everyone has encountered exactly the same problem. We hope that LG will fix this as soon as possible with some sort of update. We know that LG is capable of responding quickly to negative user feedback, which can already be read online. We will keep an eye on this and will inform you in case of any improvements.

Image scaling and smoothness of tonal transitions

5.5/10

8.7/10

Image without overscan on the SD signal
OK
OK
Smooth transition function
No
OK

Smooth transition function

The match photo shows how the TV smooths weak tonal transitions in low-quality video.

Image scaling SD (576i)

The model photo shows how it handles upscaling of SD material.

Once again, we will look at the function of smoothing tonal transitions, but this time also image scaling. The latter is particularly important when watching materials of lower quality, such as some TV programs or older films. We will focus on the function responsible for tonal transitions. Interestingly, just like in the scenes in the previous test, it performed splendidly and smoothed out practically all the choppiness, but here it had problems. Using the menu responsible for the operation of this function, we found that none - not even the strongest - setting helped.

The image scaling in TCL C855 is characterised as one of the best we have had the opportunity to test so far. The image is sharp, but in a way that could be described as natural to our eye. Even small, fine branches do not have jagged contours, and there is no white halo around figures, which is characteristic of weaker scaling systems.

No matter what one might say about the G6's issues with near-black signal, it must be fairly acknowledged that it handles heavily compressed material and lower resolution content extremely well. All unwanted, ugly tonal transitions are effectively reduced here by the "Smooth Gradation" feature. At the "Low" setting, the algorithm works flawlessly – effectively masking the artifacts resulting from strong compression without destroying the sharpness and details in the frame. Higher levels of this feature do further smooth the image, but they start to blur the real texture elements of the objects, so we recommend keeping this slider at a low level. As for the actual upscaling to 4K, the processor does an excellent job – edge sharpness and detail reconstruction are at the highest level, and in this respect, the G6 is on par with the global leaders.

Blur and motion smoothness

8/10

8.5/10

Maximum refresh rate of the panel
144Hz
165Hz
Film motion smoothing option
OK
OK
Blur reduction option
OK
OK
BFI function 60Hz
Yes, 60Hz (image flickers)
Yes, 60Hz (image flickers)
BFI function 120Hz
Yes, 120Hz
No
Brightness drop with BFI
51%
49%

Blur (native resolution, maximum refresh rate):

Blur (BFI function enabled):

Image flickers in this mode

Blur ():

Blur (4K@165Hz):

The maximum refresh rate that we can set on TCL C855 is 144 Hz. Naturally, this is only possible when connecting the TCL C855 TV to a very powerful PC. Otherwise, we will operate at a maximum refresh rate of 120 Hz, which is recommended if we primarily want to watch sports or content with a high level of motion dynamics. For those who require high fluidity of image, the manufacturer has implemented a multi-level motion smoother. It has been divided into two separate sliders that adjust the sharpness of moving images (Blur Reduction) and judder (Judder Reduction). Both sliders can be set in the range of 0 to 10, with each level affecting the degree of smoothing, so everyone can find their sweet spot. We present a setting that allows for slight smoothness without the soap opera effect.

The panel of TCL C855 features a very good response time. This is especially important, as VA panels often have issues with so-called ghosting, which is the effect where a black halo can be noticed behind a fast-moving object.

The LG G6 is an OLED television, so in the category of motion fluidity, it traditionally deserves the highest marks. The TV supports very high refresh rates of up to 165 Hz in 4K resolution, but most importantly – there are absolutely no signs of blurring on the screen. The response time of the matrix is virtually instant, ensuring that dynamic images remain perfectly sharp.

Console compatibility and gaming features

9.8/10

10/10

  • ALLM
    Yes
    Yes
  • VRR
    Yes
    Yes
  • VRR range
    48 - 144Hz
    40 - 165Hz
  • Dolby Vision Game Mode
    Yes
    Yes
  • Correct implementation of HGIG
    Yes
    Yes
  • 1080p@120Hz
    Yes
    Yes
  • 1440p@120Hz
    Yes
    Yes
  • 4K@120Hz
    Yes
    Yes
  • Game bar
    Yes
    Yes

The TCL C855 television is equipped with full HDMI 2.1 ports with a bandwidth of 48 Gb/s. During our tests, we confirmed the seamless operation of all functions that come with this standard. As you can see, all the checkboxes light up green, which will certainly be appreciated by gamers, both console and those using the television as a computer monitor. Additionally, the TCL C855 supports both AMD FreeSync and NVIDIA's G-Sync, which can be easily activated in the graphics card settings. Users with very powerful setups can provide a 144 Hz signal to the C855, which the television handles effortlessly. It's also worth mentioning the implementation of the HGIG mode, which, due to the shortcomings of the "Game" mode, is overly bright, making it difficult to configure properly on-screen. Fortunately, the television performs excellently with the Dolby Vision format.

The TCL C855, as one of the first manufacturers, has equipped its televisions with a special GameBar feature that allows extensive setting changes on the fly, without the need to exit the game. It includes functions such as an additional crosshair grid, black level correction, and settings for individuals with disabilities. In the photo, we see the next generation of this solution.

In summary, the TCL C855 television will be an ideal solution for those looking for a screen for any kind of electronic gaming. With all the features supporting such entertainment, it is incredibly engaging. It should also be emphasized that it has very low input lag, regardless of the selected settings, including with the Dolby Vision HDR format.

The LG G6 is a true beast for gamers and one of the best-equipped TVs on the market in this regard. The manufacturer didn't compromise and equipped this model with four full HDMI 2.1 ports with a maximum bandwidth of 48 Gbps. This means that no matter which port you plug in your PlayStation 5, Xbox Series X, or powerful PC, you'll get the absolute maximum performance out of them.

The TV supports a full suite of gaming technologies: from VRR (Variable Refresh Rate), to AMD FreeSync Premium Pro, and Nvidia G-Sync Compatible. Let's add to that a remarkably low, almost imperceptible input lag and an excellently functioning game panel (Game Optimizer), which allows you to constantly monitor signal parameters. Gaming on this screen, with the perfect black of OLED and powerful refresh rates, is pure pleasure.

Input lag

9.8/10

9.9/10

SDR

1080p60
16 ms
13 ms
1080p120
7 ms
5 ms
2160p60
16 ms
13 ms
2160p120
7 ms
5 ms

HDR

2160p60
16 ms
13 ms
2160p120
7 ms
5 ms
4320p60

Dolby Vision

2160p60 DV
17 ms
22 ms
2160p120 DV
9 ms
13 ms

The lag time of the TCL C855 is astonishingly low in every scenario. Even the most passionate gamers will surely appreciate the very low input lag at demanding 4K 120 Hz settings with HDR, clocking in at just 7 ms. Furthermore, the lag at these same settings, but with Dolby Vision HDR enabled, remains at the same level, which isn't so obvious with competing models. Therefore, the TCL C855 deserves the highest rating and recommendation.

When it comes to signal delay, the results are remarkably low. With a standard 120 Hz signal, the Input Lag is just 5 ms. At 60 Hz, this value increases to 13 ms, which is still excellent and completely imperceptible latency. The only thing we need to criticise is the TV’s behaviour when providing the Dolby Vision Gaming signal. In this format, the Input Lag nearly doubles, reaching 13 ms for 120 Hz and 22 ms for 60 Hz. Despite this jump, we believe these values in gaming are so low that absolutely no one will feel any discomfort during gameplay.

Compatibility with PC

8.6/10

8.7/10

Chroma 444 (max. resolution and refresh rate)
Yes
Yes
Font clarity
Good
Good
Readability of dark text and shapes
Good
Very Good
Input lag in PC mode (4K, max. refresh rate)
16ms
5ms
Matrix subpixel arrangement
BGR
RGWB
Max refresh rate
144Hz
165Hz
G-Sync
Yes
Yes

The photo shows the legibility of small fonts. Ideally, lines should be the same thickness on both light and dark text, with minimal pixel gaps.

TCL C855 when connected to a computer as a monitor performs very well. This is thanks to the very low latency between the mouse-eye-screen and the excellent readability of fonts, which comes from the proper implementation of chroma 4:4:4 at all resolutions, including 4K@144Hz. The subpixel layout is BGR, which does not negatively impact usage in Windows. However, the situation may change when using macOS or other software that may not be able to adjust fonts to this subpixel layout. Additionally, the TV has minor issues displaying fonts on a black background, for which we deducted some points.

As we mentioned earlier, the LG G6 offers an outstanding display for gamers as well as for casual computer users. With full support for Nvidia G-Sync and AMD FreeSync technology, as well as a high refresh rate of up to 165 Hz, this television performs brilliantly as a massive gaming monitor. However, daily office work with text looks a bit worse (though in our opinion still very good), which is a typical characteristic of every WOLED-type screen. Due to the specific arrangement of four subpixels (with an additional white subpixel), rather than three like in classic computer monitors, system fonts can have an additional, in this case red glow around black or white letters. This is directly due to the new structure of the second-generation Tandem OLED matrix, which now operates in an RGWB arrangement (last year's first generation Tandem OLED used a BWRG arrangement). In our opinion, the sharpness of font edges has slightly worsened because of this, but it is definitely not something that will immediately catch your eye during occasional document work or web browsing.

Viewing angles

3.5/10

7.2/10

Brightness drop at an angle of 45 degrees
73%
28%

A widely known drawback of VA panels without an angle coating is their poor performance regarding viewing angles. The same is true for the TCL C855, where even a slight off-axis shift leads to significant image washout and colour degradation.

As befits an OLED panel, the viewing angles on the LG G6 are really good. A TV viewed from the side does not lose drastically in brightness or colour saturation. In this regard, the image quality is miles better than any LCD TV – and this applies to both IPS panels and especially to VA panels that lack special wide-angle coatings. In this area, the only better screens on the market remain QD-OLED panels from Samsung Display, where the angles are simply perfect, as well as older WOLED panels with MLA (microlens) technology, which LG abandoned in this series two years ago. Unfortunately, we assess the viewing angles in this year's model to be slightly worse than last year. We noticed that the 2nd generation Tandem OLED panel tends to take on a greener hue at a steep angle, while last year's model maintained greater neutrality in this regard.

Daytime performance

7.4/10

8.2/10

Panel finish
Glare
Glare
Reflection suppression
Average
Good
Black levels during daytime
Good
Very Good

Panel brightness

LG OLED G6 (G64LW, G66LS): 857 cd/m2

TCL C855: 910 cd/m2

The glossy finish of the panel on the TCL C855 prevented it from achieving the highest rating for TV performance during daytime viewing, although it is precisely due to this that the blacks during the day are very good. Thanks to the high brightness in SDR content, the actress's face strongly stands out through reflections. However, a downside of the panel is that light hitting directly on the TV "spills" out rather than being contained in one spot. Generally speaking, if sunlight doesn't hit the panel, the TCL C855 will be a very good choice for brightly lit rooms.

LG G6 will perform wonderfully as a television in a well-lit room. Thanks to its impressive peak brightness, the TV can easily cut through most external light sources. Best of all, the new generation of Tandem OLED panel has brought significant improvements in reducing reflections. Although the screen coating is still glossy (which helps maintain well-saturated colours even in challenging conditions), it effectively dampens glare. It does this far better than traditional OLED screens with a standard glossy coating. We could confidently compare this level to glossy QD-OLED panels, but with one key advantage for LG. Unlike the competition's technology, in this model, deep black in a bright lounge remains intact. There’s no grey or purple tint from ambient light – the black in the G6 during the day is just as perfect as it is at night.

Panel details

Backlight Type
Mini-LED QLED
WRGB TANDEM OLED
Software version during testing
TV+:TVM6.0.1_926b00935_240329
43.10.69
Image processor
mt5896

Subpixel Structure:

Panel uniformity and thermal imaging:

Review TCL C855 TV Panel details
Review LG OLED G6 (G64LW, G66LS) TV Panel details

TCL C855

LG OLED G6 (G64LW, G66LS)

TV features

6.7/10

8.5/10

  • System
    Google TV
    WebOS
  • System performance
    Good
    Very good
  • HDMI inputs
    2 x HDMI 2.0, 2 x HDMI 2.1 48Gbps
    0 x HDMI 2.0, 4 x HDMI 2.1 48Gbps
  • Other inputs
    RCA (Chinch)
    IR (remote)
  • Outputs
    Toslink (Optical audio), eARC (HDMI), ARC (HDMI)
    Toslink (Optical audio), eARC (HDMI), ARC (HDMI)
  • Network Interfaces
    Wi-Fi 2.4GHz, Wi-Fi 5GHz, Ethernet (LAN) 100Mbps
    Wi-Fi 2.4GHz, Wi-Fi 5GHz, Ethernet (LAN) 100Mbps
  • TV reception
    DVB-T, DVB-T2, DVB-S, DVB-S2, DVB-C
    DVB-T, DVB-T2, DVB-S, DVB-S2, DVB-C

Classic features:

  • Recording to USB (terrestrial TV)
    No
    Yes
  • Recording programming
    No
    Yes
  • Picture in Picture (PiP)
    No
    No
  • RF remote control (no need to aim)
    Yes
    Yes
  • Backlit remote control
    No
    No
  • Teletext
    Yes
    Yes
  • Audio only mode
    No
    Yes
  • Bluetooth headphones support
    Yes
    Yes
  • Simultaneous Bluetooth headphones & TV audio
    Yes
    Yes

Smart features:

  • AirPlay
    Yes
    Yes
  • Screen mirroring (Windows Miracast)
    Yes
    Yes
  • Voice search
    Yes
    Yes
  • Voice search in native language
    Yes
    Yes
  • Ability to connect a keyboard and mouse
    Yes
    Yes
Review TCL C855 TV features
Review TCL C855 TV features
Review LG OLED G6 (G64LW, G66LS) TV features
Review LG OLED G6 (G64LW, G66LS) TV features
Review LG OLED G6 (G64LW, G66LS) TV features
Review LG OLED G6 (G64LW, G66LS) TV features

Sound connection options

  • HDMI audio
    eARC (HDMI), ARC (HDMI)
    eARC (HDMI), ARC (HDMI)
  • Other audio outputs
    Toslink (Optical audio)
    Toslink (Optical audio)
  • Wireless audio
    Bluetooth
    Bluetooth

Supported audio formats (external HDMI eARC audio):

  • Dolby Digital Plus 7.1
    Yes
    Yes
  • Dolby True HD 7.1
    No
    Yes
  • Dolby Atmos in Dolby Digital Plus (JOC)
    Yes
    Yes
  • Dolby Atmos in Dolby True HD
    No
    Yes
  • DTS:X in DTS-HD MA
    Yes
    No
  • DTS-HD Master Audio
    Yes
    No

Senior accessibility

  • Numeric keyboard on TV
    No
    No
  • Font size adjustment
    No
    No
  • Audio description
    No
    Yes

TCL C855 operates on the Google TV system, which is a significant advantage compared to TVs equipped with proprietary systems from manufacturers, where installing applications from a USB drive can be challenging or often downright impossible. With Google TV, we have the option to install almost any application, both from the official store and directly from internet repositories via APK files.

This system also offers many conveniences in terms of control. We can connect a keyboard with a touchpad, which significantly simplifies entering queries. Additionally, thanks to integration with Google, we can utilise voice control features using the remote, which works very well, although there can be minor issues with translating functions and options. It’s worth mentioning that Google TV regularly receives updates that improve functionality and introduce new options. We can also confirm that according to reports from users of older models, the software can have its off days, and sometimes it does have its "bad day".

In summary: Google TV is currently one of the most popular systems on the market. Thanks to its powerful CPU, it runs very smoothly, does not freeze, and has no issues with stuttering for a significant part of its usage. This is definitely the best option for those who want to make the most of the TCL C855 TV’s capabilities and appreciate the openness of the system.

webOS System and Smart Features

The television runs on the latest version of the webOS system. Although it is a closed platform, it supports absolutely all the key streaming apps on the market. You can also easily access useful wireless connectivity features like built-in Chromecast, AirPlay, and classic screen mirroring. However, the biggest standout feature of the LG platform is the brilliant Magic remote. While it is quite compact and lacks a physical numeric keypad, it does something that competitors still can't replicate – it functions like a wireless mouse. It is equipped with a gyroscope, allowing you to move an intuitive cursor across the screen, which dramatically speeds up entering passwords or navigating menus. Additionally, LG has one of the best voice assistants for controlling the device, and this combination with the Magic remote provides excellent capabilities for navigating the system. The only thing that can be quite irritating here is the intrusive ads and sponsored tiles, as LG increasingly clutters the main screen of the system. Despite this, the lack of Google TV is not a detriment to the G6 – considering the smooth operation of webOS, one can confidently say it is even an advantage.

Features for Traditionalists

In terms of traditional television, the LG G6 also performs excellently and does not forget about traditional users. Despite the minimalist remote, it includes a plethora of useful features. The manufacturer did not skip on the PVR function, which allows recording programs from the built-in tuners directly to external USB storage or a hard drive. We also have a smoothly functioning TimeShift for pausing live TV and a recording scheduling option. These features can prove to be a great advantage during the upcoming FIFA World Cup, when matches will be played late in the evening and we may not be able to watch them live. Of course, standard features are also included, such as the ability to connect wireless headphones via Bluetooth.

Apps

9.6/10

9.1/10

OK
Disney_Plus
OK
Amazon_Prime_Video
OK
Player_TVN
OK
Polsat_Box_Go
OK
Canal_Plus_Online
OK
TVP_VOD
OK
Apple_TV_Plus
OK
SkyShowtime
OK
Rakuten
OK
CDA_Premium_Browser
OK
Spotify
OK
Tidal
OK
Netflix
OK
YouTube
OK
HBO_MAX
OK
Kodi
No
Apple_music
OK
Eleven_sports
No
Xbox Game Pass
OK
GeForce NOW
No
Amazon Luna
OK
Boosteroid
OK
Steam Link
OK
Disney_Plus
OK
Amazon_Prime_Video
OK
Player_TVN
OK
Polsat_Box_Go
OK
Canal_Plus_Online
OK
TVP_VOD
OK
Apple_TV_Plus
OK
SkyShowtime
OK
Rakuten
OK
CDA_Premium_Browser
OK
Spotify
OK
Tidal
OK
Netflix
OK
YouTube
OK
HBO_MAX
No
Kodi
OK
Apple_music
No
Eleven_sports
OK
Xbox Game Pass
OK
GeForce NOW
OK
Amazon Luna
OK
Boosteroid
No
Steam Link

Playing files from USB

9.2/10

9.2/10

Supported photo formats:

JPEG
Yes
Yes
HEIC
No
Yes
PNG
Yes
Yes
GIF
Yes
No
WebP
Yes
No
TIFF
No
No
BMP
Yes
Yes
SVG
No
No

Maximum photo resolution:

4 Mpix
Yes
Yes
6 Mpix
Yes
Yes
8 Mpix
Yes
Yes
10 Mpix
Yes
Yes
12 Mpix
Yes
Yes
16 Mpix
Yes
Yes
20 Mpix
Yes
Yes
24 Mpix
Yes
Yes
28 Mpix
Yes
Yes
32 Mpix
Yes
Yes

The default media player on the TCL C855 handles practically all the media we've prepared for it very well. Almost every video format is supported. However, an important downside may be the lack of a font colour change feature. There are hardly any issues with photos and their maximum resolution. It's definitely worth noting the absence of support for Apple's HEIC and SVG files. On the other hand, we can play audio files without any problems, and we don't think many of you are using AIFF or DSD64. One undeniable advantage of the C855 and its operating system is that at any time we can download another player from the app store that will play anything.

The inability to install an external file player (as is the case with systems based on Android) is actually not a problem for the LG G6. The built-in factory player works great and seamlessly supports most audio, video, or photo formats that we provided from our USB drive. However, during testing, we encountered some shortcomings – namely, a rather strange lack of support for subtitles in the popular .txt format. We do believe that this option will soon be available on the G6 with the next software update.

Sound

7.2/10

8.4/10

  • Maximum volume
    -
    88dB
  • Dolby Digital Plus 7.1
    Yes
    Yes
  • Dolby True HD 7.1
    No
    No
  • Dolby Atmos in Dolby Digital Plus (JOC)
    Yes
    Yes
  • Dolby Atmos in Dolby True HD
    No
    No
  • DTS:X in DTS-HD MA
    Yes
    No
  • DTS-HD Master Audio
    Yes
    No

When assessing the sound on the TCL C855, we pay attention to several key aspects, such as whether the tones are clearly audible and do not interfere with each other, as well as whether none of them dominates the others. In the case of the TCL C855, the sound performs well – it is balanced and does not evoke any negative feelings. Generally, the sound is simply good.

For those with a home theatre system, the TCL C855 offers a wide range of audio codecs, including the two most important ones: DTS-HD Master Audio and Dolby Atmos. This ensures high sound quality that will satisfy users seeking better audio experiences.

Despite its very flat body, the LG G6 sounds surprisingly good. The manufacturer has managed to pack quite decent speakers under the display that can produce a sound that is fairly “spatial” – if you can even call the limited physical capabilities of the TV that 😉. The sound is clear, has good dynamics, and is flawless for everyday viewing of news programmes or series. The TV also supports the very popular Dolby Atmos spatial audio codec without any issues.

Unfortunately, for the second year in a row, there is no support for the DTS:X format. Be that as it may, it has recently been quite unpopular in streaming services, but a premium TV in terms of price and quality, in our opinion, simply should not limit users regarding audio format support. Additionally, we have to criticise LG for somewhat downgrading the audio menu itself. We missed more advanced settings and predefined sound profiles, which were definitely more abundant in last year's model.

Sound Quality Test

No sound test video

Acoustic Measurements

No acoustic data

88dBC (Max)

75dBC

Reader comments

Comments are provided by the external service Disqus (Zeta Global). Once loaded, Disqus may set cookies and process data about your activity.

We will remember your choice on this device. Provider's privacy policy