LG UJ7700 TV Review

Tested using Methodology v1.2
Updated May 26, 2018 at 07:48 am
LG UJ7700 Picture
Mixed Usage
Value for price beaten by
: Not at the latest test bench
TV Shows
Video Games
HDR Movies
HDR Gaming
PC Monitor
This TV was replaced by the LG UK7700
Type LED
Resolution "4k"

The LG UJ7700 is a good, versatile "4k" UHD TV. It has good viewing angles, and its performance will please both gamers and sports watchers. It isn't as good for movies in a dark room or TV shows though, since it doesn't get that bright in SDR and its contrast and uniformity could be a lot better. Its excellent smart features make it quite versatile. It uses an alternate pixel structure (RGBW) which results in less accurate display of fine details.

Our Verdict

7.2 Mixed Usage

Good TV for a mixed usage. The LG UJ7700 has a wider viewing angle than average and decent picture quality. A combination of low motion blur, low input lag and excellent smart features makes it quite versatile.

  • Decently bright
  • Low input lag which is great for gaming
  • Great smart features
  • Picture quality in a dark room is below average
  • Local dimming feature isn't great
6.0 Movies

Average choice for movies in a dark room. The UJ7700's blacks are not very deep or uniform. The local dimming feature is also better kept disabled since it can often be quite distracting.

7.7 TV Shows

Decent TV for watching TV shows. The viewing angle is a bit wider than average, and the WebOS smart platform is excellent. Unfortunately, though, it's not the brightest in SDR, which can cause issues in well-lit environments.

7.4 Sports

Good TV for watching sports. The LG UJ7700's picture is quite uniform and has little motion blur, but there is some dirty screen effect. It also has wider than average viewing angles, making it good for game days with a lot of company.

7.9 Video Games

Great TV for playing video games. Input lag is incredibly low, and, motion is suitably good as well, making the whole experience quite responsive.

6.1 HDR Movies

Good TV for HDR movies. Gets brighter than most other IPS LED TVs, and features Dolby Vision, which some users might appreciate. It can also display a wider range of colors without gradations, which is important for HDR.

7.5 HDR Gaming

The UJ7700's input lag does not deteriorate with an HDR input, which is great. The TV's already very good gaming capabilities translate well with HDR content.

8.0 PC Monitor

Average PC monitor. Necessary resolutions are present, and the wider viewing angle helps keep the entire screen uniform when sitting close. It isn't the brightest though, and the RGBW pixel structure can cause some issues with straight vertical lines.

  • 7.2 Mixed Usage
  • 6.0 Movies
  • 7.7 TV Shows
  • 7.4 Sports
  • 7.9 Video Games
  • 6.1 HDR Movies
  • 7.5 HDR Gaming
  • 8.0 PC Monitor
  1. Update 6/20/2018: Added the UK variants
  2. Update 3/12/2018: Converted to Test Bench 1.2.
  3. Update 8/10/2017: Converted to Test Bench 1.1.

Test Results

Curved No

The design of the UJ7700 is quite basic, but there are a couple of nice touches. The TV looks quite sleek, with accented edges and a basic stand but the design is definitely a step down from the 2016 UH7700. The stand is almost as wide as the TV, which may be an issue for those with narrow tables. The TV has an average thickness but unfortunately, some inputs out the back may be difficult to access if placed close to a wall.  


The stand is almost as wide as the TV itself, which may be an issue for those with smaller tables. It looks quite good though and does support the TV well.

Footprint of the 49" TV stand: 9.3" x 42.2"

Wall Mount VESA 300x300

The rear of the TV is similar to the 6 series LG TVs from 2016 such as the UH6500. It is reflective and attracts fingerprints. Many of the inputs face out the rear of the TV which may make them difficult to access if placed close to a wall.

Borders 0.55" (1.4 cm)

The borders of the TV are quite thin and look good. The plastic has a silver accent which sets them apart a bit from low end TVs.

Max Thickness 2.56" (6.5 cm)

The widest part of the TV is at the base, but overall it isn't too thick so won't stick out much if wall-mounted.

Maximum Temperature
99 °F (37 °C)
Average Temperature
91 °F (33 °C)

The TV is warmest at the bottom of the screen, where the backlight LEDs are located. Fortunately, the largest cooling vents are along the bottom edge, so the TV only gets slightly warm to the touch.

Build Quality

The build quality of the UJ7700 is okay. The TV is almost completely plastic and doesn't look or feel as premium as the UH7700 from 2016.

Picture Quality
Picture Quality
Native Contrast
1158 : 1
Contrast with local dimming
1161 : 1

The native contrast ratio of the LG UJ7700 is below average for an LED TV but is comparable to other IPS TVs. When set in a dark room, the low contrast ratio makes blacks look more grayish than really black, rendering dark scenes a bill dull and washed-out. This is a bit less problematic when the TV is set in a bright room since the ambient light can make the low contrast ratio a bit less noticeable.

With local dimming turned on, the contrast ratio stays about the same and this is due to the very poor performance of this local dimming feature.

Picture Quality
Local Dimming
Local Dimming

The local dimming on the LG UJ7700 is bad. The number of zones is low and each zone spans over a large vertical area. The reaction time is not the fastest we have seen and when turned on in SDR, the local dimming dims the whole screen. Looking at our test video, you can see that the smaller highlights get dimmed a lot. Looking at other aspects that are affected by the local dimming, like the contrast ratio and the black uniformity, it is clear that the implementation of this local dimming is not the best and this is common to most other edge-lit LED TVs. For this TV in particular, the local dimming might cause more harm than good if activated, so it could be a better idea to turn if off or simply set it to 'Low' if you really want to use this feature.

Picture Quality
SDR Peak Brightness
SDR Real Scene Peak Brightness
239 cd/m²
SDR Peak 2% Window
79 cd/m²
SDR Peak 10% Window
158 cd/m²
SDR Peak 25% Window
232 cd/m²
SDR Peak 50% Window
266 cd/m²
SDR Peak 100% Window
275 cd/m²
SDR Sustained 2% Window
79 cd/m²
SDR Sustained 10% Window
158 cd/m²
SDR Sustained 25% Window
231 cd/m²
SDR Sustained 50% Window
265 cd/m²
SDR Sustained 100% Window
274 cd/m²

Mediocre SDR peak brightness in the 'Expert (Dark Room)'. The TV's local dimming dims highlights in dark scenes in SDR content, as opposed to making them brighter like it does for HDR content, so we recommend disabling it. The 'Expert (Dark Room)' picture mode, while providing the most options to adjust the picture, is unfortunately quite dim. The 'Expert (Bright Room)' and 'Cinema' picture modes are also dim, but fortunately the 'Standard' and "Game" picture modes are much brighter. A plot of brightness over time in the 'Expert (Dark Room)' and 'Standard' picture modes is shown here.

If the TV appears too dim in a bright room, we recommend using the 'Standard' or 'Game' picture modes, disabling local dimming, using a 'W30' color temperature and using as many of our recommended settings as applicable.

Picture Quality
HDR Peak Brightness
HDR Real Scene Peak Brightness
446 cd/m²
HDR Peak 2% Window
647 cd/m²
HDR Peak 10% Window
640 cd/m²
HDR Peak 25% Window
528 cd/m²
HDR Peak 50% Window
433 cd/m²
HDR Peak 100% Window
426 cd/m²
HDR Sustained 2% Window
638 cd/m²
HDR Sustained 10% Window
634 cd/m²
HDR Sustained 25% Window
526 cd/m²
HDR Sustained 50% Window
431 cd/m²
HDR Sustained 100% Window
424 cd/m²

Decent HDR peak brightness, though not as bright as most high end TVs. The TV's worst case brightness is still fairly bright, and local dimming helps the TV make small highlights in dark scenes even brighter, as shown by our smaller window tests. The 2% white window is the brightest test, while on last year's UH7700 it was the dimmest, indicating very different local dimming behavior. However, we recommend disabling local dimming as on this TV it adds a lot of visible blooming. A plot of brightness over time is shown here.

Update 07/07/2017: Certain settings and modes make the TV brighter or dimmer, see our additional review notes below.

Picture Quality
Gray Uniformity
50% Std. Dev.
3.260 %
50% DSE
0.210 %
5% Std. Dev.
0.434 %
5% DSE
0.093 %

The gray uniformity could be better on the LG UJ7700. Looking at the 50% gray uniformity test picture, large darker bands are visible and both sides are also darker. Watching our sports test clip during the testing, dirty screen effect is visible, and this in various sports like hockey and soccer.

Looking at the 5% gray test picture, not much stands out and the overall picture looks pretty even, which is a good thing.

Picture Quality
Viewing Angle
Color Shift
24 °
31 °
Black Level
75 °

Mediocre viewing angle. Better than almost all VA TVs but not as good as most IPS TVs. The black level barely changes at an angle, but colors shift and brightness decreases rapidly when the TV is viewed at an angle. Last year's UH7700 and UH8500 had a very similar viewing angle.

Picture Quality
Black Uniformity
Native Std. Dev.
1.880 %
Std. Dev. w/ L.D.
5.808 %

The UJ7700 overall black uniformity is bad. When the local dimming is turned off, the screen is pretty even with only a bit more clouding in the upper right region and also the top edge is a bit brighter. Note here that the test picture does look more grayish than really black, but the black uniformity test is not about the level of black but more the evenness of the black.

When the local dimming is turned on, the black uniformity is very bad, as you can see on our test picture. There is a lot of blooming near the white cross of our test image, making the center of the screen way more bright than both sides. This is why the standard deviation number is so big when compared to the native standard deviation. Since the local dimming is so bad on this TV when set to max, it will cause more issues than if it was completely turned off. In a case like this, it is often recommended to completely turn off this feature.

Picture Quality
Screen Finish
Total Reflections
3.4 %
Indirect Reflections
0.8 %

The UJ7700 is quite good at handling reflections. It has a semi-gloss finish which diffuses reflects across the screen, reducing their intensity. This should be fine for an average room, but may be an issue for a very bright room.

Picture Quality
Pre Calibration
Picture Mode
Expert (Dark Room)
White Balance dE
Color dE
Color Temperature
5972 K

Out of the box, the UJ7700 is not that accurate and home-enthusiasts may notice some inaccuracies. The white balance is on the warm side and the dE is pretty high plus the gamma is not tracking our 2.2 target very well. When it comes to the color accuracy, the accuracy is average at best with the cyan colors being the worst of the lot.

Picture Quality
Post Calibration
Picture Mode
Expert (Dark Room)
White Balance dE
Color dE
Color Temperature
6714 K

The calibration process on the LG UJ7700 was a bit longer than usual, especially while doing the white balance and even with the 20 point correction, the lower end could not be corrected completely. The gamma was flattened to track more closely to our 2.2 target, but with a small imperfection that matches the low end of the white balance.

The color space management on the UJ7700 was pretty good and the total color dE was halved, which is very good. Most of the colors, including the cyan, were tracking more closely to their targets after calibration. In the end, the calibration was worth the effort, since out of the box, it was pretty inaccurate.

You can see our recommended settings here.

Picture Quality
480p Input

Low quality content such as DVDs are upscaled well. Details are preserved and the image isn't too soft. Some halo artifacts can be seen around straight lines.

Picture Quality
720p Input

720p content such as cable is upscaled well. The image remains clear.

Picture Quality
1080p Input

1080p content looks good. The image is crisp and detailed.

Picture Quality
4k Input

Unlike the UH7700 from 2016, the UJ7700 has a less accurate sub-pixel structure (RGBW). This results in slightly less clear text when viewed from up-close. It is not an issue from farther away, but can be seen in the close up pixel photo here.

Picture Quality
Color Gamut
Wide Color Gamut
DCI P3 xy
79.07 %
DCI P3 uv
87.95 %
Rec 2020 xy
58.71 %
Rec 2020 uv
68.54 %

Wide color gamut. Not as wide as most high end TVs but wider than last year's UH7700. In HDR content the red, blue and green primaries all fall short of their targets, especially the green, as most TVs struggle with deep greens. The TV isn't very accurate at showing the colors in the middle of the gamut, but is more accurate with DCI P3 colors.

The TV's EOTF follows the PQ curve fairly closely, but when shown our darkest grey slide with local dimming on high the TV turned the picture off completely. This shouldn't be a problem during normal usage though as this is a very extreme case. This EOTF was measured in the Cinema picture mode, the EOTF for game mode is shown here.

Update 07/07/2017: Certain settings and modes make the TV brighter or dimmer, see our additional review notes below.

Picture Quality
Color Volume
Normalized DCI P3 Coverage ITP
66.7 %
10,000 cd/m² DCI P3 Coverage ITP
34.9 %
Normalized Rec 2020 Coverage ITP
48.8 %
10,000 cd/m² Rec 2020 Coverage ITP
23.4 %

Sub-par color volume. The TV's RGBW pixel structure prevents it from making bright colors anywhere near as bright as it makes white. The TV's local dimming helps it darken dim colors, but its very low number of zones prevent it from darkening the center of our black-with-white-border slide, showing the poor black level of its IPS panel.

Picture Quality
Color Depth
10 Bit
Red (Std. Dev.)
0.117 dE
Green (Std. Dev.)
0.137 dE
Blue (Std. Dev.)
0.091 dE
Gray (Std. Dev.)
0.098 dE

The LG UJ7700 can display our gradient test image very smoothly and without any banding normally seen on 8-bit TVs. Overall, only very little imperfections can be seen in the darker greens, which is very good and banding should not be too problematic on this LG TV.

Picture Quality
Temporary Image Retention
IR after 0 min recovery
0.03 %
IR after 2 min recovery
0.00 %
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 UJ7700 does have some image retention, but it is quite minor, which is a very good result for an IPS TV since they are usually more prone to image retention. As you can see on our test picture, the retention right after the burn-in scene is really faint and after the first 2 minutes of recovery, is already gone. For this IPS TV, this is a very good score and people like gamers should not really be worried.

Picture Quality
Permanent Burn-In Risk
Permanent Burn-In Risk

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

Picture Quality

The less accurate RGBW sub-structure means that some straight lines (such as text for PC use) may appear jagged. This is the same behaviour as the UH6500, visible in text here.

Response Time
80% Response Time
8.4 ms
100% Response Time
17.8 ms

The response time is good, so only a short trail can be seen following fast-moving objects. This is similar to the UH7700 from 2016.

PWM Dimming Frequency
120 Hz

The TV uses PWM at 120Hz to dim the backlight. This 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.

Black Frame Insertion (BFI)
Optional BFI
Min Flicker for 60 fps
120 Hz
60 Hz for 60 fps
120 Hz for 120 fps
Min Flicker for 60 fps in Game Mode
120 Hz

The UJ7700 lacks a setting to reduce its flicker frequency to 60 Hz during 60 fps content, although its 120 Hz backlight does help somewhat to make motion look more clear.

Motion Interpolation
Motion Interpolation (30 fps)
Motion Interpolation (60 fps)

The UJ7700 has a 60Hz panel and can interpolate lower frame rate content by setting 'TruMotion' to 'User' and increasing the 'De-Judder' slider. Fans of motion interpolation may be disappointed that it can't produce as strong of a soap opera effect as 120Hz TVs such as the UH7700 from 2016.

Frame Hold Time @ 24 fps
23.9 ms
Frame Hold Time @ 60 fps
0.0 ms

The LG UJ7700 is great at displaying content without stutter, even low frame rate content such as 24p movies. The response time of the panel helps to smooth the transition between frames, which is good.

24p Judder
Judder-Free 24p
Judder-Free 24p via 60p
Judder-Free 24p via 60i
Judder-Free 24p via Native Apps

The LG UJ7700 can display 24p movies without judder when they are played from 24p sources like DVD or Blu-ray players and only when the 'Real Cinema' option is turned on (Settings--> Picture options). On the other hand, the UJ7700 can't remove judder from 24p movies when they are played from 60p/60i sources like cable or satellite boxes.

Variable Refresh Rate
Native Refresh Rate
60 Hz
Variable Refresh Rate
4k VRR Maximum
4k VRR Minimum
1080p VRR Maximum
1080p VRR Minimum
VRR Supported Connectors

This TV has a 60Hz panel and doesn't support any variable refresh rate features.

Input Lag
1080p @ 60Hz
12.4 ms
1080p @ 60Hz + HDR
12.3 ms
1080p @ 60Hz Outside Game Mode
47.6 ms
1080p @ 120Hz
4k @ 60Hz
12.4 ms
4k @ 60Hz + HDR
12.4 ms
4k @ 60Hz @ 4:4:4
12.4 ms
4k @ 60Hz @ 4:4:4 + 8 bit HDR
12.3 ms
4k @ 60Hz Outside Game Mode
64.3 ms
4k With Interpolation
97.6 ms
4k @ 120 Hz
4k with Variable Refresh Rate
1080p with Variable Refresh Rate

Outstanding low input lag, one of the best we've tested. In the Game picture mode, or in any picture mode when the input's icon is changed to PC, the TV has an excellent input lag of ~12 ms, which should please nearly any gamer. However when HDR content is played while the input’s icon is 'PC', the TV acts as though the icon wasn't 'PC', so the only picture mode with low input lag in HDR is Game mode.

Update 08/10/2017: webOS 3.6 fixed this PC mode HDR issue, HDR now plays properly in PC mode, with proper 4:4:4 color. All PC mode picture modes have low input lag, even in HDR.

Supported Resolutions
1080p @ 60Hz @ 4:4:4
1080p @ 120Hz
1440p @ 60Hz
4k @ 30Hz @ 4:4:4
4k @ 60Hz
4k @ 60Hz @ 4:4:4
4k @ 120Hz

Most common resolutions are supported. 4k @ 60 Hz @ 4:2:2 or 4:4:4 color is only supported when 'HDMI ULTRA HD Deep Color' is enabled for that input. 4:4:4 color is only properly displayed when the input's icon is set to PC. When HDR content is played when the input's icon is set to PC, the TV acts like the icon isn't PC, making the TV unable to properly display 4:4:4 color in HDR.

Update 08/10/2017: webOS 3.6 fixed this PC mode HDR issue, HDR now plays properly in PC mode, with proper 4:4:4 color.

Although the TV can properly display 4:4:4 color, its less accurate RGBW pixel structure produces artifacts when showing fine color detail. This is visible as jagged lines in our chroma 4:4:4 test image, shown here for the RGBW UH6500, compared to the perfect presentation of a true RGB TV such as the X750D shown here. This isn't a huge concern, but may be noticeable in some cases.

Side Inputs
Rear Inputs
Total Inputs
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
Inputs Specifications