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LG UM6900 TV Review

Tested using Methodology v1.4
Updated Sep 13, 2019 at 08:56 am
LG UM6900 Picture
Test Methodology v1.4
7.1
Mixed Usage
Value for price beaten by
: Vizio M7 Series Quantum 2019
5.7
Movies
7.5
TV Shows
7.3
Sports
8.0
Video Games
5.6
HDR Movies
7.3
HDR Gaming
8.3
PC Monitor
Type LED
Sub-Type
IPS
Resolution "4k"

The LG UM6900 is a decent entry-level 4k TV with an IPS panel. Like most IPS TVs, it has a wide viewing angle, but doesn't look as good in a dark room, as it has a low contrast ratio, poor black uniformity, and no local dimming. It has a fast response time and low input lag, great for gaming, but the backlight always flickers, which causes noticeable duplications in motion. Unfortunately, this TV can't get very bright, and 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 a worse viewing angle.

Our Verdict

7.1 Mixed Usage

Overall, the LG UM6900 is a decent TV for most uses. It's best-suited for watching TV shows, sports, or playing games during the day, and is a good choice for a wide seating area. Unfortunately, it isn't very good for watching movies in a dark room, in SDR, or HDR. It has a great 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.

See our Mixed Usage recommendations
5.7 Movies

This isn't a very good TV for watching movies in a dark room, unfortunately. It has a low contrast ratio, poor black uniformity, and no local dimming feature, so blacks look gray. It can remove judder from 24p sources, but not when watching movies from a cable box.

See our Movies recommendations
7.5 TV Shows

This is a good TV for watching TV shows during the day, as long as your room isn't too bright. It has great reflection handling and a good viewing angle, great if you like to walk around with the TV on. LG's WebOS has a huge selection of streaming apps, great for cord-cutters. Unfortunately, it can't get very bright, so it isn't a great choice for a really bright room with lots of windows.

See our TV Shows recommendations
7.3 Sports

Overall, this is a decent TV for watching sports. It has a good viewing angle, great if you have a wide seating area, and it has a fast response time. Unfortunately, it can't get very bright, so it isn't well-suited for a bright room, and there are noticeable duplications in motion from the backlight flicker, which could be distracting when watching sports.

See our Sports recommendations
8.0 Video Games

Overall, the LG UM6900 is a great TV for playing video games. It has outstanding low input lag and a great response time, so there is very little blur behind fast-moving objects. Unfortunately, it isn't a great choice for gaming in a dark room, though, and there are noticeable duplications in motion from the flicker of the backlight.

See our Video Games recommendations
5.6 HDR Movies

The LG UM6900 is disappointing for watching HDR movies. It has a low contrast ratio, poor black uniformity, and no local dimming feature. It can't get very bright in HDR, and can't display a wide color gamut. It only supports HDR10, and unlike most other LG TVs, it doesn't support Dolby Vision.

See our HDR Movies recommendations
7.3 HDR Gaming

This TV has outstanding low input lag and a great response time, so it's great for gaming, but only decent for gaming in HDR. It can't get very bright in HDR, so small highlights don't stand out, and it can't display a wide color gamut.

See our HDR Gaming recommendations
8.3 PC Monitor

This TV has outstanding low input lag and a great response time, but it isn't a good choice for use as a PC monitor. It uses the less accurate RGBW sub-pixel structure, which isn't great, as some artifacts can be seen, especially when you're on the desktop.

See our PC Monitor recommendations
  • 7.1 Mixed Usage
  • 5.7 Movies
  • 7.5 TV Shows
  • 7.3 Sports
  • 8.0 Video Games
  • 5.6 HDR Movies
  • 7.3 HDR Gaming
  • 8.3 PC Monitor
Pros
  • Image remains accurate at an angle.
  • Outstanding low input lag.
Cons
  • Not very bright.
  • Less accurate RGBW pixel structure.
  • Backlight always flickers, causing duplications in motion.
  1. Update 2/19/2020: Converted to Test Bench 1.4.

Check Price

43" 43UM6910PUA
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49" 49UM6900PUA
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55" 55UM6910PUA
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60" 60UM6900PUA
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65" 65UM6900PUA
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70" 70UM6970PUA
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75" 75UM6970PUA
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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 S425, the Samsung RU7100, the Vizio V Series 2019, and the Sony X750F.

Design
6.5
Design
Style
Curved No

The design of the LG UM6900 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 is no cable management.

Design
Stand

The feet on the LG 49UM6900 are set at opposite ends of the TV, so you'll need a large table for the larger sizes if it isn't VESA mounted. 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. There is no cable management at all.

Design
Borders
Borders 0.98" (2.5 cm)

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

Design
Thickness
Max Thickness 2.72" (6.9 cm)

The UM6900 is a bit thicker than most higher-end models.

6.0
Design
Build Quality

The UM6900 has mediocre build quality. There is a lot of flex in the panels, especially on the back near the inputs, and the stand doesn't support the TV very well, as there is a lot of wobble.

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

Like most IPS TVs, the UM6900 has a disappointing contrast ratio. 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

The LG 49UM6900 doesn't have a local dimming feature. The above video is provided for reference only.

5.5
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

The 49UM6900 has disappointing peak brightness. In a bright room, it can be difficult to see. There is no noticeable variation in brightness with different content, though.

The peak brightness was measured after calibration, with the 'Expert (Dark Room)' Picture Mode. The other picture modes aren't noticeably brighter.

6.1
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

Unfortunately, this TV can't get very bright in HDR. Small highlights in some scenes don't stand out as much as they should. There is also some noticeable variation in brightness with different content.

We measured the HDR peak brightness before calibrating, with the 'Cinema HDR' Picture Mode. The 'Vivid' mode reaches a peak brightness of 383 cd/m², but isn't as accurate.

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

This TV has decent gray uniformity. There is some noticeable dirty screen effect, which isn't great for watching sports, and the corners are darker than the rest of the screen.

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

Like most IPS TVs, the UM6900 has a decent viewing angle. 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

The LG UM6900 has bad black uniformity. There is noticeable clouding throughout the screen, which can be distracting in dark scenes. Unfortunately, there is no local dimming feature to reduce the amount of clouding.

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 %

Great 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

With our pre-calibration settings, the LG UM6900 has mediocre accuracy. There are noticeable inaccuracies in almost all shades of gray, and some people might notice some inaccuracies in some 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, this TV has much better accuracy. The few remaining inaccuracies aren't noticeable.

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 UM6900, like the 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
Picture Quality
Pixels

Like the LG UK6300, the UM6900 uses the 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 a decent color gamut, but it can't display a wide color gamut, which is disappointing. 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 %

Unfortunately, the UM6900 has 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

This TV has excellent gradient handling. There is some very slight banding, but this shouldn't be noticeable to most people. If you see banding, the Smooth Gradation feature 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 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
8.2
Motion
Response Time
80% Response Time
6.7 ms
100% Response Time
14.1 ms

The LG 49UM6900 has a great response time. There is 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 UK6300 and the 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.

4.7
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
No
Min Flicker for 60 fps in Game Mode
120 Hz

Like most lower-end LG TVs, there is no black frame insertion feature on the UM6900. The backlight always flickers at 120Hz, though, which helps improve the clarity of motion 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.

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
Yes

The UM6900 can remove judder from most sources, as long as the Real Cinema setting is enabled. Unfortunately, it can't remove judder from 60p or 60i sources, like a cable box.

0
Motion
Variable Refresh Rate
Native Refresh Rate
60 Hz
Variable Refresh Rate
No
HDMI Forum VRR
No
FreeSync
No
G-SYNC Compatible
No
4k VRR Maximum
N/A
4k VRR Minimum
No VRR support
1080p VRR Maximum
N/A
1080p VRR Minimum
No VRR support
1440p VRR Maximum
N/A
1440p VRR Minimum
No VRR support
VRR Supported Connectors
No VRR support

This TV has a 60Hz refresh rate, and it doesn't support any advanced variable refresh rate technologies, like AMD's FreeSync.

Inputs
9.9
Inputs
Input Lag
1080p @ 60 Hz
10.7 ms
1080p @ 60 Hz Outside Game Mode
110.7 ms
1440p @ 60 Hz
N/A
4k @ 60 Hz