Get insider access
Preferred tv store
Current deal: The Sony X900H 75” has dropped by $400 on Amazon.com. See all Black Friday deals on TVs.

Samsung JU6400 TV Review

Tested using Methodology v1.0
Reviewed Nov 17, 2015 at 12:00 am
Samsung JU6400 Picture
7.2
Mixed Usage
Value for price beaten by
: Not at the latest test bench
5.8
Movies
Value for price beaten by
: Not at the latest test bench
7.4
TV Shows
Value for price beaten by
: Not at the latest test bench
7.7
Sports
Value for price beaten by
: Not at the latest test bench
7.8
Video Games
Value for price beaten by
: Not at the latest test bench
6.5
HDR Movies
Value for price beaten by
: Not at the latest test bench
7.5
HDR Gaming
Value for price beaten by
: Not at the latest test bench
6.4
PC Monitor
Value for price beaten by
: Not at the latest test bench
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.

Our Verdict

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.

Pros
  • Great viewing angle.
  • Very low input lag.
  • Excellent motion.
Cons
  • Poor blacks and contrast.
  • Judder is present while watching movies even in 24p.
  • 7.2 Mixed Usage
  • 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

Test Results

Design
6.5
Design
Style
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.

Design
Stand

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

Design
Borders
Borders 0.63" (1.6 cm)

Design
Thickness
Max Thickness 1.85" (4.7 cm)

Picture Quality
5.4
Picture Quality
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
Picture Quality
Local Dimming
Local Dimming
No
Backlight
Direct

5.9
Picture Quality
SDR Peak Brightness
SDR Peak 2% Window
271 cd/m2
SDR Peak 50% Window
271 cd/m2

7.1
Picture Quality
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
Picture Quality
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
Picture Quality
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
Picture Quality
Gradient
Color Depth
10 Bit

7.7
Picture Quality
Pre Calibration
White Balance dE
5.21
Color dE
3.2422
Gamma
2.25

9.7
Picture Quality
Post Calibration
White Balance dE
0.62
Color dE
0.2986
Gamma
2.2

8.0
Picture Quality
480p Input

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

8.0
Picture Quality
720p Input

Cable TV or other 720p content looks good.

9.0
Picture Quality
1080p Input

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

10
Picture Quality
4k Input

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

7.1
Picture Quality
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
Picture Quality
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
Picture Quality
3D
3D
No
3D Type
No

Picture Quality
Pixels

Motion
9.7
Motion
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
Motion
Image Flicker
PWM Dimming Frequency
120 Hz
BFI
Yes
BFI Frequency
60 Hz
BFI In Game Mode
No

0
Motion
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
Motion Interpolation
Motion Interpolation (30 fps)
Yes
Motion Interpolation (60 fps)
No

Inputs
7.8
Inputs
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
Inputs
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'.

Inputs
Side Inputs

Inputs
Rear Inputs

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
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

Sound Quality
6.0
Sound Quality
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
Sound Quality
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.

Smart Features
8.0
Smart Features
Interface
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
Smart Features
Ads
Ad-free
No
Opt-out
No

Smart Features
Remote
Remote Basic

Smart Features
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.

LOG IN

JOIN RTINGS.com

Be part of the most informed community and take advantage of our advanced tools to find the best product for your needs.
Join our mailing list:
Become an insider
EARLY ACCESS

Gain early access to all tests results for new products

Early Access UI
PRICES LISTED

Prices will now be listed directly in reviews and tables

product prices UI
MORE VOTES

Have 5 votes per product category to choose which product we’ll review next

Additional votes UI
UNLIMITED ACCESS

Gain unlimited access to detailed test results in tools and results (no blurred results)

test table UI

Create Post

Create Deal