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Samsung 40MU6400 (MU6400) UHD HDR LED LCD TV – review

Picture quality

Picture analysis and calibration performed using SpectraCal Calman 2016 Ultimate for Business software, SpectraCal C6 colorimeter and VideoForge and Murideo SIX-G pattern generators.


TV tested with software version 1006.

Characteristic Value Grade*   Comment
ANSI contrast

(factory Movie SDR, 200 cd/m2 peak luminance)

4294:1 3  Good result, inline with VA LCD panel technology.
ANSI black level [cd/m2] 

(factory Movie, Movie SDR)

0.047 3  Good result, inline with VA LCD panel technology.
Peak luminance in SDR [cd/m2]

(factory Movie – Dynamic SDR)

350 2 Note: whole screen covered with white (100% full white)
Peak luminance in HDR [cd/m2] 

(factory Movie HDR)

379 1  Note: 10% of the screen covered
Peak luminance in HDR after 1 minute [cd/m2] 

(factory Dynamic)

376  4 In this section difference in luminance is graded, in ideal case, luminance should not fall lower than 5% of initial measurement.
Greyscale errors (factory Movie SDR)

(calibrated state is < 3)

3.3 4  Biggest error at 80%.
Color errors (factory Movie SDR)

(calibrated state is < 3)

3.7  3  Biggest error on red color.
Rec.709 coverage (factory Movie SDR) 98.3% 4 Acceptable range is 97%+
DCI-P3 coverage (factory Movie SDR) 85.9% 2 For more results check this overview.
Calibration controls / 3 White Balance in 2 and 20 points, CMS
Average: 2.9 good result

Note: unless mentioned differently, all factory values from the most accurate preset, in this case Movie.

* – grades 1-4, 1 = bad, 2 = average3 = good, 4 = excellent

New year brings new TVs, but no change in how the televisions are factory set – the Standard mode is greeting us with all the imperfections that we have mentioned ever since we started reviewing TVs. Fortunately, there is a Movie preset that is much closer to reference values, so close that most of the users can consider it factory-calibrated.

The calibration control this year is a 20-point white balance, allowing Samsung to finally align itself with LG’s televisions in this regard. Unfortunately, Samsung did not fix the often buggy control, so after several attempts, we calibrated TV only through two-point controls.

Gamut accurately tracks the Rec.709 color space so that the Auto function here is doing an excellent job. For those who want it, there is a manual option for primary and secondary colors.

We do not like the fact that MU6400 suffers from so-called global dimming in all presets (except in PC mode), which we managed to defeat by displaying full-screen patterns or by having a small menu up on the screen.


When HDR signal is detected, the TV activates new presets which are called the same as for SDR – Dynamic, Standard, Natural and Movie. Movie preset in again the most precise, however, the image is under-exposed so it is necessary to “breathe life” into it through the Contrast Enhancer control.

After calibration, the HDR image is the best that can be achieved with regard to limited potential in terms of dynamics and peak luminance.


More comments and tips on how to set up this TV can be found in the video below:

You can get my settings after calibration by visiting my Payhip store >>


Panel quality and backlight features

Characteristic Grade*  Comment
Backlight uniformity 4 excellent uniformity on tested unit
Dirty screen effect (DSE) 3 very small
Screen reflections 2 semi-glossy screen, moderately reduces glare and reflections
Viewing angles 1 inline with VA LCD technology – limited in terms of contrast and color saturation
Anomalies 2  bluish color when the screen is viewed under angle
Global/Local dimming 3 screen shuts down completely on full black signal, global dimming in all presets except in PC mode, no local dimming
Average: 2.5 average to good

* – grades 1-4, 1 = bad, 2 = average3 = good, 4 = excellent


Signal processing

Value Grade*  Comment
Motion resolution (Monoscope test, max. 1080) 250 max. 1 typical result for a 60 Hz VA LCD TV
Motion resolution (visual) / 1 reduced sharpness in dynamic scenes, text harder to read, blur stronger as luminance drops, long trails behind the objects  / LED Clear Motion does not improve the situation – it can make it worse with very strong doubling and rainbow effect together with reduced luminance
24 Hz playback / 3 good result, smooth playback with moderate judder – judder reduction available
Scaling / 3 very good scaling for SD and HD content
Interlaced signals / 4 passes all tested
Judder reduction / 3 available, can be manually adjusted
Color Upsampling / 3 without stair stepping effect
Reduction of noise / 3 very effective for noise, average MPEG noise reduction
Banding / 4 excellent, without steps
Average: 2.77 good

* – grades 1-4, 1 = bad, 2 = average3 = good, 4 = excellent


Picture quality – overall

Overall Grade*
1. Factory picture and calibration 2.9
2. Panel quality 2.5
3. Signal processing 2.77
Total score: 2.73

* – ocjene od 1-4, više je bolje, 1 = loše, 2 = osrednje3 = dobro, 4 = izvrsno

The picture we saw on the last year’s KU6000 series in terms of standard and high definition, as well as the standard and wide dynamic range (HDR), the new 40MU6402 displays in exactly the same quality without any variation that we can point out. The same panel, the same image processor, the same characteristics of the image before calibration and the same peak luminance to display the HDR and wide range of colors.

Honestly, we did not expect miracles for the two reasons – the first is that Samsung on the global launch of the “QLED” line was not talking about imaging improvements (new processor, new algorithms …), which was then confirmed by the first tests online (Rtings review Q7F model), including our quick test for the Q7C model (in Croatian).


Sonyjev UHD HDR-10 demo

All this does not mean that the MU6402 is a bad TV – on the contrary, it is a television that will surely satisfy most users, no matter what the content they will be viewing. For years, Samsung is implementing image processors that recognize each type of interlaced signal and show it without the “comb effect”, the shake or the moire effect. In addition, image scaling is solid – not the best on the market – but to watch our TV program in 720x576i the image resolution will be good. A big plus is a nearly calibrated Movie Template, with which you can be sure to look at colors and shades as they should be.


It is mentioned in the overview above, but still, we need to mention this once again – viewing angles are limited and if you want the best picture, you need to sit directly in front of the screen. If there are more seating areas and you want a better picture from the corner, then you will be better of with a TV with IPS panel (with LG offering the most of such).

The 40MU6402, just like its predecessors in the 6000 series, has no local dimming, but this is not a big minus given the high native contrast, as well as the fact that Samsung has no sophisticated dimming on its edge-LED models (as compared to Sony’s XD9305 or this year’s XE9305 model). While watching movies in darkened environment, the contrast was good, making titles such as The Dark Knight or Interstellar a solid experience (considering the price category).

The built-in panel works at 60 Hz and does not offer the ability to reduce the blur in the picture. There is only the Clear Motion LED option that will do more harm than good as we noted above. Interestingly, last year’s KU6072 model had better LED Clear Motion with better motion resolution without such duplication as on the tested model (we believe it’s a bug in the software and will be solved through the upcoming upgrades). For those who want a soap effect film, there is Judder Reduction control that works as before – makes the picture smooth, but introduces artifacts and variations in the playback speed.


Life of Pi – UHD Blu-ray

HDR performance, just like last year, is limited by the peak luminance the screen can display, as well as the absence of any LED backlight control. Looking at Batman v Superman: Dawn of Justice and Planet Earth II, what we first saw was a greater sharpness of the picture and a clearer shades compared to classic Blu-ray, but without truly dynamic and colorful picture higher end TVs can display. If HDR is not your priority, the 40MU6402 will do the job, but not at the level of more expensive models.


About Darko Hlušička - Darco

Founder of HD Televizija website. Certified ISF calibrator(Level II). Tech enthusiast since the 90s. Loves movie soundtracks.


  1. Hello,
    I have this TV Samsung 42MU6400 and I like it very much.
    I would like to know if is possible to get the full technical informations as hours used or purchase date of this model? For example, I have a TV Samsung 42F5500 and I can get these full informations pressing “Info -> Menu -> Mute -> Power”, but I don’t know to do same way on new model).

  2. Hello Darco,
    One question regarding UE40MU6402.
    On the bottom edge of this TV do you have any issues regarding light? I mean comb effect light and dark for 2 cm of all bottom edge of the screen. I think there is the LED for light.
    Please see an video for exemple https://www.youtube.com/watch?v=0VWnqKS0ctU
    Thank you very much.

    • Hello Catalin!

      Saw the video, this is a typical limitation of edge-lit LED LCD TVs. It varies from unit to unit so as long as the anomaly is not so big that is distracting while you watch content, no reason to contact service center.

  3. Hello. Does the 2k Resolution (2560×1440) work on this TV connected to a PC?

  4. Hi Darko,

    Thank you very much for your work!

    I have calibrated the colours according to your video on YouTube and I like the results!

    However, there is one thing I don’t know/don’t understand: If I watch actual 4K movies, should I select bt.2020 or dci-p3 ?

    Thank you.

  5. Sorry, you already replied on YouTube ^_^

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