LG UJ6300 TV REVIEW

Usage Ratings - Version 1.2
7.0
Mixed Usage
Value for price beaten by
: Not at the latest test bench
5.9
Movies
7.4
TV Shows
7.2
Sports
7.9
Video Games
5.7
HDR Movies
7.2
HDR Gaming
7.7
PC Monitor
This TV was replaced by the LG UK6300

Type : LED
Sub-Type
:
IPS
Resolution : "4k"

The LG UJ6300 UHD RGBW LED TV is an ordinary TV with a wider than average viewing angle. It features the best smart platform available and impressively low input lag. The out of the ordinary "RGBW" pixel structure also can cause smaller details and straight lines to lose sharpness.

Test Results
Design 6.5
Picture Quality 6.6
Motion 6.9
Inputs 9.3
Sound Quality 6.1
Smart Features 7.8
Pros
  • Very low input lag
  • Low motion blur
Cons
  • Not very bright
  • Blacks aren't uniform
  • Uses less accurate RGBW pixel structure
  1. Update 5/8/2018: 1440p @ 60Hz is not a supported input. It was mistakenly tested as supported, but has now been retested and found to be not supported. It is unlikely a firmware update caused this change. The score has been updated.
  2. Update 3/12/2018: Converted to Test Bench 1.2. Learn more about our versioned test bench system here.
  3. Update 9/4/2017: 4:4:4 color is now properly shown in HDR content when in PC mode, as of webOS update 3.6.
  4. Update 8/31/2017: Retested color gamut and color volume before the start of the 20/7 OLED burn-in test, on software version '3.60.03'. Both are worse than originally tested. Scores and images have been updated.
  5. Update 8/10/2017: Converted to Test Bench 1.1. Learn more about our new versioned test bench system here.

Check Price

6.5

Design

Curved : No

The design of the UJ6300 is very basic, and everything is made of plastic. There are no stylistic elements like the higher end UJ7700, and the TV doesn't look bad but it certainly won't be the centerpiece of any room. Some of the rear-facing inputs may be difficult to access if placed close to a wall.

Stand

The stand is almost as wide as the TV and looks similar to the UH6100 from 2016. It is made of plastic but supports the TV quite well.

Footprint of the 49" TV stand: 7.5" x 33.5"

Back
Wall Mount : VESA 200x200

The rear of the TV is simple, and a similar design but slightly less reflective than the UJ7700. Some of the inputs which face out the back of the TV may be difficult to access if the TV is placed close to a wall or VESA mounted.

Borders
Borders : 0.79" (2.0 cm)

The borders of the TV are slightly thicker than average, but due to their tapered edge, they don't appear too thick. They are made of plastic.

Thickness
Max Thickness : 3.23" (8.2 cm)

The TV is quite thick, with the thickest part near the base of the TV below the inputs. It will stick out from the wall a bit if mounted.

Temperature
Maximum Temperature
:
95 °F (35 °C)
Average Temperature
:
91 °F (33 °C)

The TV is fairly cool, only getting slightly warm along the top edge and a few places on the back. As with most TVs, there are vents on the bottom edge and a vent on the back of the TV, near the top.

6.0 Build Quality

The build quality of the UJ6300 is decent. Everything is made of plastic, but these parts certainly won't break under normal use.

6.6

Picture Quality

The LG UJ6300 LED TV has an average picture quality. If set in a dark room, the low contrast ratio and the poor black uniformity of the UJ6300 result in disappointing dark scenes, with blacks tending to look gray rather than actually black. When set in a bright room, those two aspects of the picture quality are a bit less problematic, since the ambient light will reduce the effect of the low contrast ratio. Even then, if the light is a bit too intense, then the below-average SDR peak brightness may not be enough to fight glare. The gray uniformity could be better, but luckily dirty screen effect is not too problematic and paired with the passable viewing angle performance, the UJ6300 could be used in a wide living room to watch sports with a large group of people. Lastly, the HDR performance could be better. It can't produce saturated colors and has an average HDR peak brightness and also lacks local dimming so HDR content doesn't stand out.

6.5 Contrast
Native Contrast
:
1314 : 1
Contrast with local dimming
:
N/A

The LG UJ6300 has a passable contrast ratio for a LED TV. This low contrast ratio makes dark scenes appear washed-out and makes blacks appear more gray than really black, especially when set in a dark room. The TV fares much better when set in a bright room since the light usually makes the low contrast ratio less noticeable.

If you compare this IPS TV with other IPS TVs we have reviewed before, the UJ6300 contrast ratio of 1314:1 is actually better than most of them.

0 Local Dimming
Local Dimming
:
No
Backlight
:
Direct

The UJ6300 does not have a local dimming feature. The video is for reference only.

5.5 SDR Peak Brightness
SDR Real Scene Peak Brightness
:
174 cd/m²
SDR Peak 2% Window
:
167 cd/m²
SDR Peak 10% Window
:
168 cd/m²
SDR Peak 25% Window
:
169 cd/m²
SDR Peak 50% Window
:
171 cd/m²
SDR Peak 100% Window
:
175 cd/m²
SDR Sustained 2% Window
:
167 cd/m²
SDR Sustained 10% Window
:
167 cd/m²
SDR Sustained 25% Window
:
168 cd/m²
SDR Sustained 50% Window
:
170 cd/m²
SDR Sustained 100% Window
:
174 cd/m²
SDR ABL
:
0.003

Disappointing SDR peak brightness in the 'Expert (Dark Room)' picture mode. While this mode has the most accurate picture quality, it is much dimmer than the 'Standard' picture mode, as shown in this brightness plot. If you find the TV not bright enough, it's best to use the 'Standard' mode with a color temperature of 'W30' and as many of our recommended settings as applicable.

With 'Expert (Dark Room)' the TV is only bright enough for a really dark room, while with 'Standard' it is bright enough for a moderately lit room.

6.1 HDR Peak Brightness
HDR Real Scene Peak Brightness
:
297 cd/m²
HDR Peak 2% Window
:
319 cd/m²
HDR Peak 10% Window
:
319 cd/m²
HDR Peak 25% Window
:
318 cd/m²
HDR Peak 50% Window
:
318 cd/m²
HDR Peak 100% Window
:
318 cd/m²
HDR Sustained 2% Window
:
317 cd/m²
HDR Sustained 10% Window
:
318 cd/m²
HDR Sustained 25% Window
:
317 cd/m²
HDR Sustained 50% Window
:
317 cd/m²
HDR Sustained 100% Window
:
317 cd/m²
HDR ABL
:
0.000

Mediocre HDR peak brightness. The brightness doesn't change depending on the content shown, as all our tests were about equal (the real scene test is measured at the edge of the screen which is dimmer). This constant brightness is a good thing, but it's still not nearly as bright as intended for HDR content. A plot of brightness over time is shown here.

If you find HDR content too dim in the 'Cinema' and 'Game' picture modes, you can enable 'Dynamic Contrast', as explained here. This won't increase the brightness of highlights but it will make most of the scene brighter, at the cost of slightly worse picture quality. The 'Standard' picture mode is even brighter, but also has worse picture quality than 'Movie'. This can be alleviated somewhat by using our recommended settings with a 'W30' color temperature.

6.9 Gray Uniformity
50% Std. Dev.
:
5.567 %
50% DSE
:
0.210 %
5% Std. Dev.
:
0.657 %
5% DSE
:
0.069 %

The gray uniformity of the UJ6300 could be better. The 50% standard deviation is pretty high, and this is caused mostly because of the darker edges corners, as you can see on the 50% gray uniformity test picture. Some vertical bands are slightly visible near the center, but dirty screen effect is not that much noticeable when watching content like sport, which is better than what we had on the UJ7700.

Looking at the 5% gray uniformity picture and numbers, not much stand out and these are very good results.

6.2 Viewing Angle
Color Shift
:
22 °
Brightness
:
29 °
Black Level
:
75 °

Mediocre viewing angle, better than almost all VA TVs but not as good as some other IPS TVs such as the UH6150. Blacks remain essentially unchanged no matter the angle, but colors shift and brightness decreases at moderate angles.

4.2 Black Uniformity
Native Std. Dev.
:
3.168 %
Std. Dev. w/ L.D.
:
N/A

The UJ6300 black uniformity is poor. Most of the uniformity issues are due to the darker edges and corners, similarly to what affected the gray uniformity. Only the right upper corner is a bit brighter than the rest of the screen. Some vertical lines are also visible toward the right side of the screen.

8.5 Reflections
Screen Finish
:
Semi-gloss
Total Reflections
:
3.3 %
Indirect Reflections
:
0.7 %

The UJ6300 is quite good at handling reflections. The screen is semi-gloss which helps to reduce the intensity of direct reflections but does diffuse them across the screen. For a room with a couple of windows, this is not an issue, but bright glare on the screen may be a problem.

5.1 Pre Calibration
Picture Mode
:
Expert (Dark Room)
White Balance dE
:
5.11
Color dE
:
4.84
Gamma
:
2.21
Color Temperature
:
5763 K

Out of the box, the UJ6300 accuracy could be better. The white balance dE and the color dE are high enough that almost anybody could notice it, even if not an enthusiast. The white balance is on the warm side, missing mostly blue. Looking at the color accuracy, all the color are a bit off, with the blues and cyans being the one with the higher dE. Overall, the gamma curve is not very flat, but the gamma number is not that far from our 2.2 target.

9.2 Post Calibration
Picture Mode
:
Expert (Dark Room)
White Balance dE
:
0.24
Color dE
:
2.05
Gamma
:
2.19
Color Temperature
:
6550 K

The calibration process of the UJ6300 was a bit longer than usual, but this is mostly because the setting menu was affecting the measurements. This happens from time to time depending on the TV models, but in that particular case, we had to go out of the menu every time before taking some reading. Besides that, the process worked pretty well, and the high white balance dE what corrected and brought down to a negligible 0.24, which is an excellent result. As the consequence of the correction of the white balance, the gamma was flattened to track more closely our 2.2 target.

When it comes to the color accuracy, the provided color management system has proven to be quite good, even though some colors, mostly in the blue and red, were still a bit off. But even with this small error, the total color dE is now more than half what is was before calibration.

You can see our recommended settings here.

8.0 480p Input

Upscaling of low-quality content such as DVDs is good. Like most LG TVs, some halo artifacts are visible along edges but this isn't much of an issue.

8.0 720p Input

720p content such as cable looks good. Details are preserved and the image isn't too soft.

9.0 1080p Input

1080p sources such as Blu-rays look good. The image remains clear and detailed.

8.0 4k Input

With some 4k content (such as text for PC monitor use) the less accurate RGBW pixel structure results in some artifacts. This is the same as the UH6500 and visible in the chroma test pattern of that TV here. This is also visible in the pixels photo.

6.8 Color Gamut
Wide Color Gamut
:
No
DCI P3 xy
:
76.21 %
DCI P3 uv
:
82.09 %
Rec 2020 xy
:
54.71 %
Rec 2020 uv
:
59.88 %

Standard color gamut, only good enough for SDR Rec. 709 content. When watching HDR content, greens will be significantly undersaturated, and blues and reds too to a lesser extent. Luckily the TV is fairly accurate at showing the colors it is able to, especially P3 colors.

In the 'Cinema' and 'Game' picture modes the TV dims HDR content significantly, as shown by their EOTFs here and here. This isn't present in 'Standard', shown here, and is alleviated in 'Cinema' and 'Game' by enabling 'Dynamic Contrast', as shown here and here.

Update 08/31/2017: Retested color gamut before the start of the 20/7 OLED burn-in test, on software version '3.60.03'. The color gamut is worse than originally tested, because the TV is using other subpixels even when showing pure colors. Shown here is the TV's pixels when showing pure blue, and the green subpixel is also lit, which reduces the saturation of the blue. The color gamut scores and images have been updated.

4.7 Color Volume
Normalized DCI P3 Coverage ITP
:
55.6 %
10,000 cd/m² DCI P3 Coverage ITP
:
19.0 %
Normalized Rec 2020 Coverage ITP
:
39.3 %
10,000 cd/m² Rec 2020 Coverage ITP
:
13.3 %

Poor color volume. The TV's RGBW pixel structure prevents it from making bright colors nearly as bright as it can make white. Its color gamut narrows severely when showing dark colors, and its black level is not good.

Update 08/31/2017: Retested color volume before the start of the 20/7 OLED burn-in test, on software version '3.60.03'. The color gamut is worse than originally tested, because the TV is using other subpixels even when showing pure colors. Shown here is the TV's pixels when showing pure blue, and the green subpixel is also lit, which reduces the saturation of the blue. The TV's color volume is reduced because the color gamut is reduced. The color volume scores and images have been updated.

8.1 Gradient
Color Depth
:
10 Bit
Red (Std. Dev.)
:
0.101 dE
Green (Std. Dev.)
:
0.116 dE
Blue (Std. Dev.)
:
0.093 dE
Gray (Std. Dev.)
:
0.115 dE

The UJ6300 can display our test gradient image pretty well and without any banding problems. Some little imperfections can be seen in the dark blue and green, but those are very minor does not affect regular content.

4.9 Temporary Image Retention
IR after 0 min recovery
:
7.85 %
IR after 2 min recovery
:
0.34 %
IR after 4 min recovery
:
0.00 %
IR after 6 min recovery
:
0.00 %
IR after 8 min recovery
:
0.00 %
IR after 10 min recovery
:
0.00 %

The UJ6300 suffers from image retention and it is fairly easy to notice it, as is does not take a long exposure to a still image to create some retention. As you can see on our test picture, taken right after the 10 minutes burn-in scene, the image retention is very clear and easy to see. It was also easy to notice during the review process, as we had to give it some time, running normal video content to clear up the retention, before tests like the gray uniformity, since just displaying, let's say our contrast checkerboard, did induce image retention.

On the good side, the retention does not last very long, even if it is pretty strong at the beginning. As you can see from the test results, after 4 minutes of recovery time, the image retention was completely gone and the screen was back to normal.

10 Permanent Burn-In Risk
Permanent Burn-In Risk
:
No

Although some IPS panels can suffer from temporary image retention, this doesn't appear to be permanent as seen in our long-term test.

Pixels

The less accurate RGBW pixel structure causes some artifacts when viewing some 4k content (such as PC text) from up close.

6.9

Motion

The motion handling of the UJ6600 is average. It has a fast response time, resulting in only a short trail following fast moving objects. The backlight flickers by default, and there is, unfortunately, no option to reduce this frequency and clear up fast-paced content. Movies from a Blu-ray player or DVDs are smooth, but some minor judder is present when movies are watched from a HTPC or cable. Most people don't notice this so it isn't an issue. The TV has a 60Hz panel which is able to interpolate lower frame rate content.

7.9 Response Time
80% Response Time
:
7.1 ms
100% Response Time
:
16.7 ms

The response time is good, so only a short trail can be seen following fast-moving objects. This is similar to the UJ7700.

4.0 Flicker-Free
Flicker-Free
:
No
PWM Dimming Frequency
:
120 Hz

The TV uses PWM at 120Hz to dim the backlight, starting at 100/100 backlight setting. Lowering the setting shortens the duty cycle, while amplitude remains nearly constant. Backlight PWM helps clear up motion slightly, but results in duplications following fast-moving objects, visible in the motion blur box. The backlight oscilloscope was taken in HDR mode, as the TV doesn't utilize its full brightness in SDR. 100% backlight in SDR looks like this.

5.4 Black Frame Insertion (BFI)
Optional BFI
:
No
Min Flicker for 60 fps
:
120 Hz
60 Hz for 60 fps
:
No
120 Hz for 120 fps
:
N/A
Min Flicker for 60 fps in Game Mode
:
120 Hz

Like with other 2017 LG TVs, there is no option to reduce the flicker frequency to 60 Hz, although the TV's 120 Hz PWM flicker does help somewhat to make motion look more clear during fast-paced content.

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

The UJ6300 has a 60Hz panel and can interpolate lower frame rate content by setting 'TruMotion' to 'User' and increasing the 'De-Judder' slider. However, the UJ6300 can't produce as strong of a soap opera effect as 120Hz TVs such as the UH7700 from 2016, and cannot interpolate 60Hz content. Note that any motion interpolation will introduce artifacts, so use a small value unless you really like the soap opera effect. There are also some bugs in the interpolation which causes more stuttering than usual, especially with our full-screen pattern.

8.0 Stutter
Frame Hold Time @ 24 fps
:
25.0 ms
Frame Hold Time @ 60 fps
:
0.0 ms

The LG UJ6300 is great at displaying content without stutter, even at low frame rates such as 24p movies. The response time causes some blur to appear between frames, which helps to smooth the transition.

7.8 24p Judder
Judder-Free 24p
:
Yes
Judder-Free 24p via 60p
:
No
Judder-Free 24p via 60i
:
No
Judder-Free 24p via Native Apps
:
Yes

Only 24p movies playing from 24p sources like DVD and Blu-rays players are judder free. The UJ6300 can't remove judder from 24p movies playing from 60p/60i sources like cable and satellite boxes.

To be able to display 24p movies without judder when playing from 24 sources, the 'Real Cinema setting must be turned on.

0 Variable Refresh Rate
Native Refresh Rate
:
60 Hz
Variable Refresh Rate
:
No
4k VRR Maximum
:
N/A
4k VRR Minimum
:
N/A
1080p VRR Maximum
:
N/A
1080p VRR Minimum
:
N/A
VRR Supported Connectors
:
N/A

THe LG UJ6300 doesn't support any variable refresh rate features, and has a native 60Hz panel.

9.3

Inputs

The UJ6300 supports nearly all the common input signals, including HDR, and should be able to properly display any content. It also has incredibly low input lag which should please almost any gamer.

9.8 Input Lag
1080p @ 60Hz
:
13.1 ms
1080p @ 60Hz + HDR
:
12.7 ms
1080p @ 60Hz Outside Game Mode
:
45.9 ms
1080p @ 120Hz
:
N/A
4k @ 60Hz
:
13.0 ms
4k @ 60Hz + HDR
:
12.8 ms
4k @ 60Hz @ 4:4:4
:
12.6 ms
4k @ 60Hz @ 4:4:4 + 8 bit HDR
:
12.6 ms
4k @ 60Hz Outside Game Mode
:
62.6 ms
4k With Interpolation
:
95.9 ms
4k @ 120 Hz
:
N/A
4k with Variable Refresh Rate
:
N/A
1080p with Variable Refresh Rate
:
N/A

Outstanding low input lag. When in the Game picture mode or in any picture mode, when the input's icon is set to PC, the TV's input lag is an excellent ~11 ms, which should please almost any gamer. However, only the Game picture mode has low input lag for HDR content, as when HDR content is played, when the input's icon is set to PC, the TV acts as though the icon is not PC.

Update 9/4/2017: HDR is now supported in PC mode as of WebOS update 3.6. 4:4:4 color is now properly displayed in HDR content when in PC mode. All input lag values have been retested with the newer firmware, and remain nearly unchanged.

6.7 Supported Resolutions
1080p @ 60Hz @ 4:4:4
:
Yes
1080p @ 120Hz
:
No
1440p @ 60Hz
:
No
4k @ 30Hz @ 4:4:4
:
Yes
4k @ 60Hz
:
Yes
4k @ 60Hz @ 4:4:4
:
Yes
4k @ 120Hz
:
No

Most of the common input resolutions are supported. 4:4:4 color is only properly displayed when the input's icon is set to PC. 4k @ 60 Hz @ 4:2:2 or 4:4:4 color can only be played when 'HDMI ULTRA HD Deep Color' is enabled for the input being used. 4:4:4 color is not properly displayed for HDR content, because when HDR content is played when the input's icon is PC the TV acts as though the input's icon wasn't PC.

Update 9/4/2017: HDR is now supported in PC mode as of WebOS update 3.6. 4:4:4 color is now properly displayed in HDR content when in PC mode.

Although 4:4:4 color is displayed properly, the screen's RGBW pixel structure produces artifacts when showing fine color detail, artifacts like jagged lines and missing pixels. This is shown here on our 4:4:4 test image when displayed on the RGBW UH6500. The same image displayed on an RGB TV like the Sony X750D has no such artifacts, as shown here. These artifacts aren't a huge problem but they are noticeable at times when using the TV as a PC monitor.

Update 05/08/2018: 1440p @ 60Hz is not a supported input. It was mistakenly tested as supported, but has now been retested and found to be not supported. It is unlikely a firmware update caused this change. The score has been updated.

Side Inputs
Rear Inputs
Total Inputs
HDMI : 3
USB : 2
Digital Optical Audio Out : 1
Analog Audio Out 3.5mm : 0
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
:
Yes
Dolby Vision
:
No
HLG
:
Yes
3D
:
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
:
Yes (HDMI 1,2,3)
HDMI 2.1 Full Bandwidth
:
No
ARC
:
Yes (HDMI 2)
USB 3.0
:
No
HDCP 2.2 : Yes (HDMI 1,2,3)
CEC : Yes
MHL : No
Variable Analog Audio Out : No
Wi-Fi Support : Yes (2.4 GHz, 5 GHz)
6.1

Sound Quality

The UJ6300, unfortunately, doesn't sound good. Like every TV in this price range, any decent sound bar or entry-level speaker system will provide a significant upgrade to the overall experience.

6.0 Frequency Response
Low-Frequency Extension
:
100.79 Hz
Std. Dev. @ 70
:
4.19 dB
Std. Dev. @ 80
:
4.24 dB
Std. Dev. @ Max
:
6.20 dB
Max
:
84.8 dB SPL
Dynamic Range Compression
:
3.96 dB

Poor frequency response. The UJ6300's sound signature suffers from overexaggerated high-bass which causes it to sound very muddy and boomy. It's bass also doesn't extend very well, causing it to sound quite thin. It also doesn't get very loud.

6.2 Distortion
Weighted THD @ 80
:
0.082
Weighted THD @ Max
:
0.774
IMD @ 80
:
2.63 %
IMD @ Max
:
41.27 %

High amounts of distortion are present across the volume range on the UJ6300. As expected, it rises somewhat linearly with the level at which it is set to.

7.8

Smart Features

Smart OS : WebOS
Version : 3.5

The UJ6300 runs LG's webOS 3.5, which has a lot of advanced options while still being easy to navigate. The remote has several buttons that open quick menus to easily change common settings, yet digging deeper into the interface reveals a lot of low-level options. The included remote is unfortunately very basic and lacks the microphone and pointer features of LG's smart remote.

8.5 Interface
Ease of Use
:
Easy
Smoothness
:
Average
Time Taken to Select YouTube
:
4 s
Time Taken to Change Backlight
:
9 s
Advanced Options
:
Many
0 Ad-Free
Ads
:
Yes
Opt-out
:
No
Suggested Content in Home
:
Yes
Opt-out of Suggested Content
:
No

There are video ads in the LG Content Store (in the top left corner of the above picture), and static ads in search results. They cannot be removed.

8.0 Apps and Features
App Selection
:
Many
App Smoothness
:
Average
Cast Capable
:
Yes
USB Drive Playback
:
Yes
USB Drive HDR Playback
:
Yes
HDR in Netflix
:
Yes
HDR in Amazon Video
:
Yes
HDR in YouTube