LG UM6900 TV Review

Tested using Methodology v1.5
Updated Jul 29, 2020 at 09:27 am
LG UM6900 Picture
6.4
Mixed Usage
Value for price beaten by
: Samsung TU7000
5.5
Movies
7.1
TV Shows
7.0
Sports
7.2
Video Games
5.3
HDR Movies
6.5
HDR Gaming
7.7
PC Monitor
Type LED
Sub-Type
IPS
Resolution "4k"

The LG UM6900 is a passable entry-level 4k TV with an IPS panel. Like most IPS panel TVs, it isn't well-suited for dark rooms, as its low contrast ratio and poor black uniformity result in blacks that look grayish. Motion blur is minimal thanks to its decent response time, but there's no black frame insertion feature to further improve motion clarity. Also, the backlight's 120Hz flicker causes noticeable duplication in motion, which can be distracting. Unfortunately, even though it has good reflection handling, it can't get very bright, so visibility can be an issue in bright rooms. Its low input lag provides a responsive gaming experience; however, it lacks support for any variable refresh rate technology to reduce screen tearing. Lastly, it uses a less accurate sub-pixel structure, which isn't ideal for use as a PC monitor.

Note that the 60" and 70" models likely use VA panels, and we expect them to have better contrast and black uniformity, but worse viewing angles.

Our Verdict

6.4 Mixed Usage

The LG UM6900 is passable for most uses. It's best-suited for watching TV shows, sports, or playing games. Its wide viewing angles make it a good choice for a wide seating area; however, it doesn't get very bright, so it isn't suitable for bright rooms. Unfortunately, it isn't very good for watching movies in SDR or HDR, as it has a low contrast ratio, bad black uniformity, and no local dimming. It has a decent response time and outstanding low input lag, which would make it a great TV for use as a PC monitor, but the RGBW pixel structure isn't as accurate.

Pros
  • Wide viewing angles.
  • Outstanding low input lag.
Cons
  • Low SDR and HDR peak brightness.
  • Low contrast ratio.
5.5 Movies

The LG UM6900 is sub-par for watching movies. It has a low contrast ratio that makes blacks look gray and there's visible clouding throughout the screen, which can be distracting. Furthermore, it doesn't have a local dimming feature. It can remove judder from 24p sources, but not when watching movies from a cable box.

Pros
  • Can remove judder from 24p sources.
Cons
  • Low contrast ratio.
  • No local dimming.
7.1 TV Shows

The LG UM6900 is decent for watching TV shows. It has decent viewing angles, so you can walk around while watching without losing too much image quality. Reflection handling is good; however, this TV doesn't get very bright, making it difficult to see in bright rooms. It upscales lower resolution content from cable TV well, and you can safely leave it on the news all day without having to worry about permanent burn-in.

Pros
  • Wide viewing angles.
  • Good reflection handling.
Cons
  • Low SDR and HDR peak brightness.
7.0 Sports

The LG UM6900 is a decent TV for watching sports. It has decent viewing angles, which is great for watching a big game with family and friends. It has a decent response time, but it doesn't have an optional black frame insertion feature to further improve motion clarity. Unfortunately, even though it has good reflection handling, it can't get very bright, so it isn't well-suited for a bright room. There's also some dirty screen effect, and the backlight's flicker causes visible image duplication.

Pros
  • Wide viewing angles.
  • Decent response time.
  • Good reflection handling.
Cons
  • Low SDR and HDR peak brightness.
7.2 Video Games

The LG UM6900 is decent for playing video games. It has extremely low input lag and it has a decent response time that results in only a short blur trail behind fast-moving objects. Sadly, it doesn't support any variable refresh rate technology and its low contrast makes it less ideal for gaming in the dark.

Pros
  • Outstanding low input lag.
  • Decent response time.
Cons
  • No VRR support.
  • Low contrast ratio.
5.3 HDR Movies

The LG UM6900 is sub-par for watching HDR movies. Its IPS panel has a low contrast ratio and poor black uniformity, and it doesn't have a local dimming feature. Additionally, it can't get very bright in HDR and can't display a wide color gamut.

Pros
  • Can remove judder from 24p sources.
Cons
  • Low SDR and HDR peak brightness.
  • Low contrast ratio.
  • No local dimming.
6.5 HDR Gaming

The LG UM6900 is okay for gaming in HDR. It has low input lag and decent response time; however, it can't display a wide color gamut and doesn't get very bright, so highlights don't pop the way they should. Also, it has a low contrast ratio that makes blacks look gray, it doesn't have a local dimming feature, and it doesn't support any variable refresh rate technology.

Pros
  • Outstanding low input lag.
  • Decent response time.
Cons
  • Low SDR and HDR peak brightness.
  • No VRR support.
  • Low contrast ratio.
  • No local dimming.
7.7 PC Monitor

Although the LG UM6900 has a low input lag and it supports chroma 4:4:4, it uses the less accurate RGBW sub-pixel structure, which results in some visible artifacts when using the TV as a PC monitor.

Pros
  • Wide viewing angles.
  • Outstanding low input lag.
  • Good reflection handling.
Cons
  • Less accurate RGBW pixel structure.
  • 6.4 Mixed Usage
  • 5.5 Movies
  • 7.1 TV Shows
  • 7.0 Sports
  • 7.2 Video Games
  • 5.3 HDR Movies
  • 6.5 HDR Gaming
  • 7.7 PC Monitor
  1. Update 7/29/2020: Updated review for accuracy.
  2. Update 6/17/2020: We corrected a minor mistake in our BFI scoring.
  3. Update 5/21/2020: Converted to Test Bench 1.5.
  4. Update 2/21/2020: Converted to Test Bench 1.4.

Test Results

perceptual testing image
Market Context
Market Context
Market Context

The LG UM6900 is a basic, entry-level 4k TV. It's a 2019 model and is the closest replacement to the 2018 LG UK6300. It mainly competes with other entry-level TVs, including the TCL 4 Series 2019, the Samsung RU7100, the Vizio V Series 2019, and the Sony X750F.

Design
6.5
Design
Style
Curved No

The LG UM6900's design is very basic and feels a bit cheap. It looks very similar to the LG UM7300 but appears to be made of slightly cheaper materials. The stand doesn't support the TV very well as it wobbles a lot, and there's no cable management.

Design
Stand

The feet are set almost as wide as the TV itself, so you'll need a large table if you don't plan on wall-mounting it. The feet don't support the TV very well, and there's a lot of wobble.

Footprint of the 49" model: 40.7" by 9.2".

Design
Back
Wall Mount VESA 300x300

The back of the TV is very plain. Unfortunately, there's no cable management at all.

Design
Borders
Borders 0.98" (2.5 cm)

The borders are a bit thicker than most higher-end models and they protrude from the screen, so they're a bit more noticeable when watching TV.

Design
Thickness
Max Thickness 2.72" (6.9 cm)

The LG UM6900 is a bit thicker than most higher-end models; however, it shouldn't stick out too much when wall-mounted unless you use the back-facing ports.

6.0
Design
Build Quality

The build quality is mediocre and is almost identical to the LG UM7300. There's a lot of flex in the back panel, especially the area surrounding the inputs. The stand doesn't support the TV well, causing a fair amount of wobble.

Picture Quality
5.9
Picture Quality
Contrast
Native Contrast
967 : 1
Contrast with local dimming
N/A

The contrast ratio is sub-par, which is expected of most IPS TVs. This results in blacks that look gray, and is especially noticeable in a dark room.

Note that the 60" and 70" models likely use VA panels, and probably have better contrast.

0
Picture Quality
Local Dimming
Local Dimming
No
Backlight
Direct

This TV doesn't have a local dimming feature. The above video is provided for reference only.

4.5
Picture Quality
SDR Peak Brightness
SDR Real Scene Peak Brightness
163 cd/m²
SDR Peak 2% Window
189 cd/m²
SDR Peak 10% Window
192 cd/m²
SDR Peak 25% Window
192 cd/m²
SDR Peak 50% Window
192 cd/m²
SDR Peak 100% Window
192 cd/m²
SDR Sustained 2% Window
188 cd/m²
SDR Sustained 10% Window
191 cd/m²
SDR Sustained 25% Window
191 cd/m²
SDR Sustained 50% Window
192 cd/m²
SDR Sustained 100% Window
191 cd/m²
SDR ABL
0.001

This TV has a bad SDR peak brightness, so visibility can be an issue in bright rooms. The brightness doesn't vary much across different content and the slightly dimmer 2% window isn't noticeable.

We measured the SDR peak brightness after calibration, using the 'Expert (Dark Room)' Picture Mode and with Brightness set to max. Unfortunately, the other picture modes aren't noticeably brighter.

5.3
Picture Quality
HDR Peak Brightness
HDR Real Scene Peak Brightness
295 cd/m²
HDR Peak 2% Window
234 cd/m²
HDR Peak 10% Window
322 cd/m²
HDR Peak 25% Window
321 cd/m²
HDR Peak 50% Window
320 cd/m²
HDR Peak 100% Window
320 cd/m²
HDR Sustained 2% Window
232 cd/m²
HDR Sustained 10% Window
321 cd/m²
HDR Sustained 25% Window
321 cd/m²
HDR Sustained 50% Window
319 cd/m²
HDR Sustained 100% Window
319 cd/m²
HDR ABL
0.022

Poor HDR peak brightness. It isn't bright enough to make small highlights stand out in HDR content. On the upside, the brightness is fairly consistent, with only the 2% window being dimmer due to frame dimming.

We measured the HDR peak brightness before calibration, using the 'Cinema HDR' Picture Mode and with Brightness set to max.

If you don't mind losing image accuracy, you can reach a peak brightness of 383 cd/m² by using the 'Vivid' Picture Mode, with Brightness and Contrast set to max.

6.8
Picture Quality
Gray Uniformity
50% Std. Dev.
5.673 %
50% DSE
0.203 %
5% Std. Dev.
0.689 %
5% DSE
0.093 %

Gray uniformity is okay. The corners of the screen are visibly darker and there's also some dirty screen effect, which isn't great for watching sports.

7.0
Picture Quality
Viewing Angle
Color Washout
24 °
Color Shift
69 °
Brightness Loss
27 °
Black Level Raise
70 °
Gamma Shift
26 °

Decent viewing angles. This is good if you have a wide seating area, or if you like to move around a bit with the TV on.

Note that the 60" and 70" models likely have VA panels, and probably have a worse viewing angle.

4.5
Picture Quality
Black Uniformity
Native Std. Dev.
3.012 %
Std. Dev. w/ L.D.
N/A

Bad black uniformity. There's noticeable clouding throughout the screen as well as backlight bleed at the top and bottom left corners, which can be distracting in dark scenes.

Note that the 60" and 70" models likely have VA panels, so they probably have better black uniformity.

7.9
Picture Quality
Reflections
Screen Finish
Semi-gloss
Total Reflections
4.2 %
Indirect Reflections
1.0 %
Calculated Direct Reflections
3.2 %

Good reflection handling. Glare can still be an issue in a bright room, though, or if you have light sources opposite the TV.

6.0
Picture Quality
Pre Calibration
White Balance dE
4.94
Color dE
3.60
Gamma
2.16
Color Temperature
5849 K
Picture Mode
Expert (Dark Room)
Color Temp Setting
Warm 2
Gamma Setting
2.2

Before calibration, the color accuracy is mediocre. While balance is off, gamma doesn't follow the target at all, and the color temperature is much warmer than our 6500K target, giving the overall image a slight reddish tint. Also, there are inaccuracies in most colors.

9.0
Picture Quality
Post Calibration
White Balance dE
0.40
Color dE
1.95
Gamma
2.19
Color Temperature
6788 K
White Balance Calibration
22 point
Color Calibration
Yes
Auto-Calibration Function
No

After calibration, the color accuracy is outstanding. White balance is nearly perfect and gamma follows the target for the most part, with only some over-brightening in very bright scenes. The few remaining inaccuracies aren't noticeable, but color temperature is still a tad on the cold side.

You can see our recommended settings here.

8.0
Picture Quality
480p Input

480p content looks great, with no significant issues.

8.0
Picture Quality
720p Input

720p content, like most cable TV channels, looks great, with no obvious issues.

9.0
Picture Quality
1080p Input

1080p content, like movies on Blu-ray, looks excellent. There are no obvious issues.

8.0
Picture Quality
4k Input

The LG UM6900, like the LG UK6300, uses an RGBW sub-pixel structure. This structure is less accurate, and isn't ideal for use with a PC. Learn more about RGBW.

0
Picture Quality
8k Input

The LG UM6900 can't display an 8k signal.

Picture Quality
Pixels

This TV uses a less accurate RGBW pixel structure. Learn more about RGBW.

6.8
Picture Quality
Color Gamut
Wide Color Gamut
No
DCI P3 xy
75.47 %
DCI P3 uv
81.38 %
Rec 2020 xy
54.23 %
Rec 2020 uv
59.35 %

This TV has an okay color gamut, but it can't display a wide color gamut. The EOTF doesn't follow the PQ curve properly, and almost all scenes are displayed brighter than they should be, including in 'Game' mode. If you find HDR too dim, the 'Vivid' Picture Mode is a bit brighter, as shown in this EOTF.

4.9
Picture Quality
Color Volume
Normalized DCI P3 Coverage ITP
56.2 %
10,000 cd/m² DCI P3 Coverage ITP
20.4 %
Normalized Rec 2020 Coverage ITP
41.1 %
10,000 cd/m² Rec 2020 Coverage ITP
14.9 %

The LG UM6900 has a poor color volume. Colors aren't as bright as pure white, and it can't display dark, saturated colors very well due to the low contrast ratio.

8.6
Picture Quality
Gradient
Color Depth
10 Bit
Red (Std. Dev.)
0.091 dE
Green (Std. Dev.)
0.103 dE
Blue (Std. Dev.)
0.072 dE
Gray (Std. Dev.)
0.102 dE

Excellent gradient handling. There's some very slight banding, but this shouldn't be noticeable to most people. If banding bothers you, enabling Smooth Gradation can help, but it can also cause a loss of some fine details.

10
Picture Quality
Temporary Image Retention
IR after 0 min recovery
0.00 %
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 %

There are no signs of temporary image retention on the LG UM6900, even immediately after displaying our static test image for 10 minutes.

10
Picture Quality
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 the IPS panel in our long-term test appear immune.

Motion
7.2
Motion
Response Time
80% Response Time
6.7 ms
100% Response Time
14.1 ms

Decent response time. There's some slight overshoot in some transitions, which can be noticeable in dark scenes. The flicker of the backlight causes noticeable duplications in motion, which can be seen in the above photo.

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

Unfortunately, like the LG UK6300 and the LG UM7300, the backlight flickers at 120Hz, even at maximum backlight. This flicker causes noticeable duplications in motion, as you can see in our pursuit camera photo.

5.4
Motion
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

Update 06/17/2020: There was a minor mistake in our BFI scoring. It's been corrected, and the score has increased a bit.

There's no black frame insertion feature on this TV. The backlight always flickers at 120Hz, though, which helps improve motion clarity compared to a TV with no flicker.

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

This TV has an optional motion interpolation feature, which can be used to increase the frame rate of low frame rate content up to 60 frames per second. This can help improve the appearance of motion, but also introduces something known as the "Soap Opera Effect", which may bother some people. If you want to use motion interpolation, set TruMotion to 'User' and adjust the De-Judder slider to '10'.

7.5
Motion
Stutter
Frame Hold Time @ 24 fps
27.6 ms
Frame Hold Time @ 60 fps
2.6 ms

The relatively slow response time of this TV results in less noticeable stutter. Some stutter can still be seen with 24p movies, though, especially in slow, panning shots.

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