Reviewed on Sep 13, 2019

LG UM6900 TV REVIEW

Usage Ratings - Version 1.3
7.1
Mixed Usage
Value for price beaten by
: Vizio V Series 2019
5.8
Movies
7.5
TV Shows
7.3
Sports
8.0
Video Games
5.6
HDR Movies
7.3
HDR Gaming
8.1
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.

Test Results
Design 6.5
Picture Quality 6.7
Motion 7.0
Inputs 9.6
Sound Quality 6.6
Smart Features 7.8
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.

Check Price

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.

6.5

Design

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.

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".

Back
Wall Mount : VESA 300x300

The back of the TV is very plain. There is no cable management at all.

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.

Thickness
Max Thickness : 2.72" (6.9 cm)

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

Temperature
Maximum Temperature
:
90 °F (32 °C)
Average Temperature
:
83 °F (28 °C)
6.0 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.

6.7

Picture Quality

The LG UM6900 delivers decent overall picture quality. Like most IPS displays, it has a low contrast ratio, so blacks look gray, and it has poor black uniformity. Unfortunately, it lacks a local dimming feature which could improve these things. It has decent viewing angles, though, which is great if you like to move around or have a wide seating area, and it has great reflection handling. The 49UM6900 can't get very bright, even with SDR content, so it might be difficult to see it in a bright room.

Note that the 60" and 70" models likely use VA panels, so they probably have better contrast and black uniformity, but a worse viewing angle.

5.9 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 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 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 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 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 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 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.

8.0 Reflections
Screen Finish
:
Semi-gloss
Total Reflections
:
4.2 %
Indirect Reflections
:
1.0 %

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 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.

9.1 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 480p Input

480p content looks great, with no significant issues.

8.0 720p Input

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

9.0 1080p Input

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

8.0 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.

6.8 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 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 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 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 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.

Pixels

Like the LG UK6300, the UM6900 uses the less accurate RGBW pixel structure. Learn more about RGBW.

7.0

Motion

The LG UM6900 has decent motion handling. It has a great response time, resulting in only a short blur trail behind fast-moving objects. Unfortunately, the TV uses PWM flicker to dim the backlight, which causes noticeable duplications in motion; this can't be disabled. There's an optional motion interpolation feature, but since this TV has a 60Hz refresh rate, it's only useful for low frame rate content like movies. It doesn't support any variable refresh rate technologies.

8.2 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 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 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.

7.0 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 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 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 Variable Refresh Rate
Native Refresh Rate
:
60 Hz
Variable Refresh Rate
:
No
G-SYNC Compatible
:
No
4k VRR Maximum
:
N/A
4k VRR Minimum
:
N/A
1080p VRR Maximum
:
N/A
1080p VRR Minimum
:
N/A
1440p VRR Maximum
:
N/A
1440p VRR Minimum
:
N/A
VRR Supported Connectors
:
N/A

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

9.6

Inputs

The LG UM6900 has outstanding low input lag, great for gaming. It only supports the most basic resolutions, though, and unlike higher-end LG TVs, it doesn't support Dolby Vision.

9.9 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
:
10.3 ms
4k @ 60 Hz + 10 bit HDR
:
12.6 ms
4k @ 60 Hz @ 4:4:4
:
9.1 ms
4k @ 60 Hz Outside Game Mode
:
111.2 ms
4k @ 60 Hz With Interpolation
:
111.2 ms
8k @ 60 Hz
:
N/A
1080p @ 120 Hz
:
N/A
1440p @ 120 Hz
:
N/A
4k @ 120 Hz
:
N/A
1080p with Variable Refresh Rate
:
N/A
1440p with VRR
:
N/A
4k with VRR
:
N/A
8k with VRR
:
N/A
Auto Low Latency Mode (ALLM)
:
Yes

This TV has outstanding low input lag, as long as 'Game' mode is used. There's an automatic low latency mode, though, so the TV should automatically enable game mode from most gaming devices.

7.5 Supported Resolutions
1080p @ 60 Hz @ 4:4:4
:
Yes
1080p @ 120 Hz
:
No
1440p @ 60 Hz
:
No
1440p @ 120 Hz
:
No
4k @ 60 Hz
:
Yes
4k @ 60 Hz @ 4:4:4
:
Yes
4k @ 120 Hz
:
No
8k @ 30 Hz or 24 Hz
:
No
8k @ 60 Hz
:
No

The UM6900 supports only the most basic formats, including 1080p and 4k. It can display chroma 4:4:4 content properly, which is important for use as PC monitor, as long as the input icon is changed to 'PC' from the Home Dashboard.

Input Photos
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
HDR10+
:
No
Dolby Vision
:
No
HLG
:
Yes
3D
:
No
HDMI 2.0 Full Bandwidth
:
Yes (HDMI 1,2,3)
HDMI 2.1
:
No
CEC : Yes
HDCP 2.2 : Yes (HDMI 1,2,3)
USB 3.0
:
No
Variable Analog Audio Out : No
Wi-Fi Support : Yes (2.4 GHz, 5 GHz)

Unlike higher-end LG TVs, the UM6900 doesn't support Dolby Vision.

Audio Passthrough
ARC
:
Yes (HDMI 2)
eARC support
:
No
Dolby Atmos via TrueHD via eARC
:
No
DTS:X via DTS-HD MA via eARC
:
No
5.1 Dolby Digital via ARC