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Reviewed on Nov 17, 2015

Samsung JU6400 TV REVIEW

Usage Ratings - Version 1.0
7.2
Mixed Usage
Value for price beaten by
: Not at the latest test bench
5.8
Movies
7.4
TV Shows
7.7
Sports
7.8
Video Games
6.5
HDR Movies
7.5
HDR Gaming
6.4
PC Monitor
This tv was replaced by the Samsung KU6300

Type : LED
Resolution : 4k
Refresh Rate : 60 Hz

The JU6400 is the entry point of Samsung's 4k TVs. It doesn't look cheap, has very little blur on movement, and delivers excellent performance for video games. Unfortunately, the picture quality in a dim room is bad (blacks will appear gray), and judder is present on 24p movies.

Test Results
Design 6.5
Picture Quality 7.0
Motion 7.7
Inputs 7.5
Sound Quality 6.4
Smart Features 8.0
Pros
  • Great viewing angle.
  • Very low input lag.
  • Excellent motion.
Cons
  • Poor blacks and contrast.
  • Judder is present while watching movies even in 24p.

Check Price

6.5

Design

Curved : No

The Samsung JU6400 is thin, and the overall look of the TV is good. The slim borders and the stand are made of plastic with a brushed steel appearance. The fixed stand is sturdy, and has a small footprint, but is prone to collecting dust.

Stand

Dimensions of 55" TV stand: 22" x 9".

Borders
Borders : 0.63" (1.6 cm)

Thickness
Max Thickness : 1.85" (4.7 cm)

7.0

Picture Quality

This isn't a good TV for watching movies in a dim room. The contrast is very low and the blacks will appear gray. The TV also has judder on 24p sources (like Blu-ray) and doesn't have any fancy features like 3D, local dimming, or HDR.

5.4 Contrast
Native Contrast
:
706 : 1

Contrast is really poor on the 55" UN55JU6400, and blacks will often appear gray. Those flaws won't be too apparent in a well-lit room. Other sizes of the JU6400 doesn't have this problem.

0 Local Dimming
Local Dimming
:
No
Backlight
:
Direct

6.0 SDR Peak Brightness
SDR Peak 2% Window
:
271 cd/m2
SDR Peak 50% Window
:
271 cd/m2

7.1 Gray Uniformity
50% Std. Dev.
:
4.062 %
50% DSE
:
0.184 %

Uniformity isn't great, with horizontal and vertical banding that can be seen. The corners are also a lot darker. Those problems could be apparent on playing fields of uniform color.

6.9 Viewing Angle
LCD Type
:
IPS (only 55")
Color Shift
:
29 °
Brightness
:
44 °
Black Level
:
75 °

Like other IPS TVs, the 55" one has a wide viewing angle. Colors remain saturated at an angle, though the picture darkens a bit. Other sizes of the series have worse viewing angle.

Update 01/06/2017: We have changed the methodology of testing. Since this is an old TV which we don't have anymore, we extrapolated the results from 2016 TVs.

6.1 Black Uniformity
Native Std. Dev.
:
2.572 %

There is a lot of cloudiness on black screens, and bright flashlighting is present on the right side.

10 Gradient
Color Depth
:
10 Bit

7.7 Pre Calibration
White Balance dE
:
5.21
Color dE
:
3.2422
Gamma
:
2.25

9.7 Post Calibration
White Balance dE
:
0.62
Color dE
:
0.2986
Gamma
:
2.2

8.0 480p Input

Lower resolutions content like DVDs or SD channels will look better with 'Digital Clean View' set to 'high.'

8.0 720p Input

Cable TV or other 720p content looks good.

9.0 1080p Input

As with most of Samsung's UHD TVs, 1080p looks great.

10 4k Input

4k content look sharp and is displayed without any issues.

7.1 Color Gamut
Wide Color Gamut
:
No
DCI P3 xy
:
79.01 %
DCI P3 uv
:
84.82 %
Rec 2020 xy
:
56.47 %
Rec 2020 uv
:
64.79 %

8.0 Reflections
Reflection
:
1.8 %
Screen Finish
:
Semi-gloss

The semi-gloss finish doesn't reflect a lot of light, and there is no rainbow around bright objects.
The TV can get bright enough for most environments.

0 3D
3D
:
No
3D Type
:
No

Pixels
7.7

Motion

The motion on the JU6400 is excellent. Objects will stay defined even when moving at full speed, and details won't be lost in the action. Because of the somewhat average gray uniformity, some dark patches can be seen on long camera pans over the fields.

9.7 Motion Blur
Response Time
:
6.8 ms
Overshoot
:
1.7 ms

This is the Samsung TV with the least amount of blur we've seen this year. There is a little bit of overshoot (see the trail to the left of our moving logo), but movement is pretty clear overall.

4.8 Image Flicker
PWM Dimming Frequency
:
120 Hz
BFI
:
Yes
BFI Frequency
:
60 Hz
BFI In Game Mode
:
No

0 24p Playback
Judder-free 24p
:
No
Judder-free 24p via 60p
:
No
Judder-free 24p via 60i
:
No

Judder in movies isn't too noticeable, but this TV cannot eliminate it without the use of the soap opera effect ('Auto Motion Plus').

5.0 Motion Interpolation
Motion Interpolation (30 fps)
:
Yes
Motion Interpolation (60 fps)
:
No

7.5

Inputs

Combined with its excellent motion handling, the JU6400 is great for video games. Action on the screen is well-defined, and the controls are very responsive. You can still find better options for a dedicated gaming TV, but the JU6400 is near the top.

7.8 Input Lag
1080p @ 60Hz
:
26.4 ms
1080p With Interpolation
:
110.7 ms
1080p @ 60Hz Outside Game Mode
:
119 ms
1080p @ 60Hz @ 4:4:4
:
34.9 ms

The very low input lag is among the best you can find when you set the TV to game mode. In PC mode, the input lag is still good, at 34.9 ms.

6.0 Supported Resolutions
1080p @ 60Hz @ 4:4:4
:
Yes
1080p @ 120Hz
:
No
4k @ 30Hz @ 4:4:4
:
Yes
4k @ 60Hz
:
Yes
4k @ 60Hz @ 4:4:4
:
No

Unlike other 4k Samsung TVs, the JU6400 doesn't do 4k @ 60Hz @ 4:4:4 (there is no 'UHD Color' option). To get Chroma 4:4:4 in the other modes, label the input as 'PC'.

Side Inputs
Rear Inputs
Total Inputs
HDMI : 3
USB : 2
Digital Optical Audio Out : 1
Analog Audio Out 3.5mm : 1
Analog Audio Out RCA : 0
Component In : 1 (shared)
Composite In : 1 (shared)
Tuner (Cable/Ant) : 1
Ethernet : 1
DisplayPort : 0
IR In : 0
SD/SDHC : 0

Inputs Specifications
HDR10
:
No
Dolby Vision
:
No
5.1 Passthrough ARC Dolby Digital
:
Yes
5.1 Passthrough ARC DTS
:
Yes
5.1 Passthrough Optical Dolby Digital
:
Yes
5.1 Passthrough Optical DTS
:
Yes
HDMI 2.0 Full Bandwidth : No
ARC : Yes (HDMI 3)
USB 3 : Yes (1)
HDCP 2.2 : Yes
CEC : Yes
MHL : Yes (HDMI 2)
Variable Analog Audio Out : No

6.4

Sound Quality

The sound isn't very accurate, and doesn't have great bass. Still, it can get fairly loud, and there isn't too much distortion.

Note: Sound Quality test for TVs reviewed before 2017 was performed at 75dB, 85dB, and Max SPL. Starting 2017, the target SPL levels have been changed to 70dB, 80dB, and Max dB SPL.

6.0 Frequency Response
Std. Dev. @ 70
:
5.47 dB SPL
Std. Dev. @ 80
:
5.29 dB SPL
Std. Dev. @ Max
:
7.10 dB SPL
Max
:
91.2 dB SPL
Low-end Cutoff
:
134 Hz

Poor frequency response especially at higher volumes where pumping and compression may be present. The TV does get relatively loud, but the extension is poor.

7.2 Total Harmonic Distortion
Distortion @ 70
:
0.009
Distortion @ 80
:
0.010
Distortion @ Max
:
0.053

Very good distortion results. There is a noticeable increase under maximum load, but remains with-in the limits.

8.0

Smart Features

Smart OS : Tizen

There isn't a huge variety of apps, but the Tizen OS feels intuitive. The basic remote makes navigating the smart features less pleasant, but it is useful enough for navigating all the TV settings.

Check out our full review of Samsung's smart features.

0 Ads
Ad-free
:
No
Opt-out
:
No

Remote
Remote : Basic

Misc
Power Consumption : 75 W
Power Consumption (Max) : 165 W
Firmware : 1422

Differences between Sizes and Variants

The 55" Samsung UN55JU6400 that we reviewed has a PLS panel (version FD05), which is a sub-category of the IPS family, and which produces grayish blacks, and has a wide viewing angle. If someone comes across a different type of panel used, let us know and we will update our review. Thank you in advance.

Some of our visitors reported that the 40", 43" and 48" version of the JU6400 has VA panels with better contrast ratios and worse viewing angles.

7.2 Mixed Usage

The JU6400 is a mixed bag. It is an excellent option for gaming, great for sports and well-suited for a well-lit family room. Unfortunately, it won't be as good for movie lovers who like to watch TV in a dim room, as the TV has poor blacks and suffers from judder. Depending on your viewing habits it can be great, or bad.

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