LG SK9000 TV Review

Updated Apr 20, 2018 at 10:19 am
LG SK9000 Picture
Usage Ratings - Version 1.3
8.0
Mixed Usage
Value for price beaten by
: Samsung Q70/Q70R QLED
7.2
Movies
8.3
TV Shows
8.1
Sports
8.5
Video Games
7.1
HDR Movies
7.9
HDR Gaming
8.6
PC Monitor
This TV was replaced by the LG SM9000
Type LED
Sub-Type
IPS
Resolution 4k

The Super UHD LG SK 9000 is a 4k TV with very good performance for a range of usages. The picture quality is good in a bright room, and the TV can get bright to overcome glare. It also has great reflection handling, and the image remains accurate when viewed at an angle. Unfortunately, the dark-room performance is sub-par as the native contrast ratio is low and blacks appear gray, despite the full-array local dimming.

Our Verdict

8.0 Mixed Usage

Very good TV for a wide range of usages. The TV is best suited for bright rooms with wide seating, as it can get bright to combat glare and has great reflection handling. Image remains accurate when viewed at an angle which is great. Picture quality in a dark room is sub-par as the full-array local dimming isn't enough to make up for the low native contrast ratio. Input lag is very low and motion handling is good, so the TV feels responsive for gaming or PC use.

See our Mixed Usage recommendations
7.2 Movies

Decent for watching movies in a dark room. Full-array local dimming helps to alleviate the poor native contrast ratio but blacks still appear gray or details are crushed in dark scenes. The TV can display 24p movies from most sources without judder which is great.

See our Movies recommendations
8.3 TV Shows

Great for watching TV shows in a bright room. The LG SK 9000 can get bright in SDR to combat glare, and reflection handling is great. Image also remains accurate when viewed from an angle, which is good for those with wide seating. The smart platform works well for casual browsing or finding content on Netflix and YouTube.

See our TV Shows recommendations
8.1 Sports

Great for watching sports in a bright room. Image remains accurate when viewed at an angle which is great for gatherings for an important game. The response time is fast, which is great for displaying fast motion without much of a trail. The screen can get bright to overcome glare, and anti-reflective coating works great.

See our Sports recommendations
8.5 Video Games

Great for gamers. Input lag is very low, so games feel responsive. The response time is excellent, resulting in only a short blur trail behind fast-paced content. The LG SK9000 can also flicker the image to clear up fast motion, and the picture quality is good in a room with some light.

See our Video Games recommendations
7.1 HDR Movies

Decent choice for watching HDR movies in a dark room. Contrast ratio is low so blacks appear gray, even with full-array local dimming. The TV can produce bright and saturated highlights. It supports both HDR10 and Dolby Vision.

See our HDR Movies recommendations
7.9 HDR Gaming

Great for HDR gaming. Picture quality is good, but low contrast ratio results in dark scenes that appear gray or washed out in a dark room. Input lag is low and response time is excellent so the TV feels very responsive even in fast action sequences. The TV can produce bright and saturated highlights in HDR.

See our HDR Gaming recommendations
8.6 PC Monitor

Great for use as a monitor. The colors remain accurate at an angle, which is great for viewing the sides of the screen from up close. Supports chroma 4:4:4 for clear text across all backgrounds. Input lag and fast response time are low, so the TV feels responsive and movement is clear.

See our PC Monitor recommendations
  • 8.0 Mixed Usage
  • 7.2 Movies
  • 8.3 TV Shows
  • 8.1 Sports
  • 8.5 Video Games
  • 7.1 HDR Movies
  • 7.9 HDR Gaming
  • 8.6 PC Monitor
Pros
  • Image remains accurate when viewed at an angle
  • Feels very responsive for gaming
  • Can produce bright highlights
Cons
  • Blacks appear gray in a dark room
  1. Update 2/28/2019: Converted to Test Bench 1.3. Learn more about our versioned test bench system here.

Check Price

Test Results

Design
Design
Stand

The stand is curved and looks very similar to last year's SJ9500. It has a slightly darker metal finish and is slightly narrower. The stand does wobble a bit if the floor shakes.

Footprint of the 55" TV Stand: 9.8" x 32.5"

Design
Back
Wall Mount VESA 300x300

The rear of the LG 55SK9000 is very similar to the SJ8500, except all black. There is only basic cable management as seen here.

Design
Borders
Borders 0.43" (1.1 cm)

The borders of the TV are thin, and look great. Similar to the SJ9500, the bezel does not surround the LCD panel. The panel is attached on top of the frame and could be damaged if knocked on the side. Care should be taken when moving the TV, as it could be damaged if knocked, similar to what happened to our SJ8500.

Design
Thickness
Max Thickness 1.89" (4.8 cm)

The TV has an average thickness but appears thin when viewed from the side due to the gentle angles of the back. It does not stick out when wall mounted.

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

The TV runs fairly cool. The full array backlight results in a more uniform temperature throughout the back body of the TV. No part of it gets warm enough to cause any issues.

7.5
Design
Build Quality

Good build quality. We noticed a small gap between the main panel and exterior bezel, but this should not be an issue. Like the SJ8500, the LG 55SK9000 is almost entirely plastic, but there isn't too much flex.

Picture Quality
6.5
Picture Quality
Contrast
Native Contrast
1306 : 1
Contrast with local dimming
1311 : 1

The native contrast ratio on the SK9000PUA is decent, as is typical of IPS panels. When in a dark room, blacks will look more gray than black. This is less noticeable when in a brightly lit room.

The local dimming feature is ineffective at increasing the contrast ratio.

5.0
Picture Quality
Local Dimming
Local Dimming
Yes
Backlight
Full-Array

The local dimming feature on the SK9000 is not responsive enough. It reacts too slowly to moving highlights, and the dimming zones turn on and off too late. It is very similar to the Vizio M Series 2017. We do not recommend using the 'High' setting. 'Medium' or 'Low' work best depending on personal preference.

8.1
Picture Quality
SDR Peak Brightness
SDR Real Scene Peak Brightness
458 cd/m²
SDR Peak 2% Window
152 cd/m²
SDR Peak 10% Window
357 cd/m²
SDR Peak 25% Window
410 cd/m²
SDR Peak 50% Window
446 cd/m²
SDR Peak 100% Window
464 cd/m²
SDR Sustained 2% Window
151 cd/m²
SDR Sustained 10% Window
354 cd/m²
SDR Sustained 25% Window
408 cd/m²
SDR Sustained 50% Window
445 cd/m²
SDR Sustained 100% Window
464 cd/m²
SDR ABL
0.065

Very good SDR peak brightness, bright enough for most rooms. Highlights appear dim, this is due to the poor local dimming feature. If you find highlights too dim, set the 'Local Dimming' setting to Low or Off.

This test was done with the 'Contrast' set to '90', which is our recommended value to get the brightest TV possible without causing white crush.

7.4
Picture Quality
HDR Peak Brightness
HDR Real Scene Peak Brightness
520 cd/m²
HDR Peak 2% Window
427 cd/m²
HDR Peak 10% Window
1180 cd/m²
HDR Peak 25% Window
764 cd/m²
HDR Peak 50% Window
586 cd/m²
HDR Peak 100% Window
547 cd/m²
HDR Sustained 2% Window
181 cd/m²
HDR Sustained 10% Window
362 cd/m²
HDR Sustained 25% Window
461 cd/m²
HDR Sustained 50% Window
525 cd/m²
HDR Sustained 100% Window
545 cd/m²
HDR ABL
0.066

Decent peak HDR brightness. Very small highlights are only noticeable in the sense that they are dimmer than the rest, again a symptom of the poor local dimming. Real scenes are bright enough for most rooms, although still far from the target 1000 cd/m² to fully appreciate HDR content.

6.5
Picture Quality
Gray Uniformity
50% Std. Dev.
4.790 %
50% DSE
0.239 %
5% Std. Dev.
0.629 %
5% DSE
0.096 %

Decent overall gray uniformity on the LG SK 9000. The sides of the screen are darker than the rest, but this is not as noticeable as when it is darker in the center. There is noticeable dirty screen effect in the center; this will be especially noticeable when watching sports.

7.6
Picture Quality
Viewing Angle
Color Washout
29 °
Color Shift
65 °
Brightness Loss
33 °
Black Level Raise
70 °
Gamma Shift
43 °

Mediocre viewing angle on the SK9000, far better than most TVs with VA panels, but far worse than TVs with OLED panels. Colors and brightness shift when viewing off angle, making this TV an okay, but less than ideal choice for a room where people will frequently be watching from the side of the TV.

5.4
Picture Quality
Black Uniformity
Native Std. Dev.
2.343 %
Std. Dev. w/ L.D.
2.598 %

Poor black uniformity on the SK9000. When local dimming is off, there is noticeable backlight bleed across most of the screen.

With local dimming set to 'High', there is visible blooming around the image. The full array local dimming on the SK9000 is turning the zones off, but the results are much worse than other FALD TVs like the Sony X900F.

8.7
Picture Quality
Reflections
Screen Finish
Semi-gloss
Total Reflections
3.4 %
Indirect Reflections
0.5 %

Decent reflection handling on the SK 9000, identical to the SJ8500. The semi-gloss finish diffuses reflections a bit, reducing their intensity. These results should be fine for most rooms.

6.1
Picture Quality
Pre Calibration
White Balance dE
5.13
Color dE
3.42
Gamma
2.13
Color Temperature
6139 K
Picture Mode
Expert (Dark Room)
Color Temp Setting
Warm 2
Gamma Setting
2.2

The most accurate results out of the box were obtained with the 'Expert (Dark Room)' picture mode. Color and White Balance dE were good, but the color temperature was cold, giving everything a slightly blue tint. The color and white balance delta is low enough that most people won't notice.

9.4
Picture Quality
Post Calibration
White Balance dE
0.11
Color dE
1.67
Gamma
2.19
Color Temperature
6508 K
White Balance Calibration
20 point
Color Calibration
Yes
Auto-Calibration Function
Yes

Excellent white balance after calibration. Color dE was still a bit high, as the Color Management System in the SK9000 was not very effective at correcting the blue errors. Gamma is very close to our target, shifting a little off target at the low and high end of our inputs.

You can see our recommended settings here.

8.0
Picture Quality
480p Input

There were no obvious issues upscaling older 480p content like DVDs on the LG SK9000.

8.0
Picture Quality
720p Input

720p content is scaled well on the SK 9000 with no obvious over softening or artifacts.

9.0
Picture Quality
1080p Input

1080p content, like Blu-rays look good.

10
Picture Quality
4k Input

Native 4k content is clear and sharp.

8.1
Picture Quality
Color Gamut
Wide Color Gamut
Yes
DCI P3 xy
88.98 %
DCI P3 uv
94.51 %
Rec 2020 xy
65.97 %
Rec 2020 uv
73.14 %

Good coverage of the P3 color space, the TV is able to display a wide color gamut.

The HDR EOTF in the 'Technicolor Expert' picture mode is too bright for most of our PQ curve, and rolls of gradually at the peak brightness of the TV. The 'PC' and 'Game' EOTF curves are very similar to that of 'Technicolor Expert', which is good.

When displaying HDR content in 'PC Mode', the SK9000 does not properly detect the wide color gamut so colors appear washed. This is the same as the C8.

6.9
Picture Quality
Color Volume
Normalized DCI P3 Coverage ITP
76.7 %
10,000 cd/m² DCI P3 Coverage ITP
34.5 %
Normalized Rec 2020 Coverage ITP
62.1 %
10,000 cd/m² Rec 2020 Coverage ITP
27.3 %

Decent color volume, but the LG 55SK9000 is unable to produce deep, dark blacks due to its poor contrast ratio and ineffective local dimming. It is also inconsistent in producing bright saturated colors. Color volume is worse than last year's SJ8500.

8.5
Picture Quality
Gradient
Color Depth
10 Bit
Red (Std. Dev.)
0.101 dE
Green (Std. Dev.)
0.120 dE
Blue (Std. Dev.)
0.093 dE
Gray (Std. Dev.)
0.064 dE

There were some issues with the SK9000's gradient handling that are not reflected in our testing score. Large areas of near-uniform color showed large areas of banding, worse than the C8. This can be reduced by enabling the TV's 'MPEG Noise Reduction' feature, which enables the gradient smoothing feature of the SK 9000. This helps reduce banding but also causes a loss of detail.

9.9
Picture Quality
Temporary Image Retention
IR after 0 min recovery
0.06 %
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 TV does show some signs of image retention. Only a faint outline of the logo is visible, and it is completely gone before 2 minutes recovery. It is an improvement over the SJ8500, and there is not enough persistence for it to be an issue for most people.

10
Picture Quality
Permanent Burn-In Risk
Permanent Burn-In Risk
No

While IPS panels can have some temporary image retention, there doesn't appear to be any risk of permanent burn-in as seen in our long-term test.

Picture Quality
Pixels
Motion
8.5
Motion
Response Time
80% Response Time
5.1 ms
100% Response Time
14.4 ms

Excellent response time on the LG 55SK9000PUA, great for watching sports or fast paced movies. Most of the blur visible in the photo is caused by 60 fps persistence when there is no flicker, but there is a small motion blur trail behind the logo. There is some overshoot on the 100% transitions but it is minor and should not cause any ghosting. Only a short trail can be seen following fast-moving objects.

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

The SK9000PUA uses PWM to dim the backlight, which helps to clear up motion slightly, but results in some duplications following fast-moving objects, as can be seen in the motion blur box photo. This causes the backlight to flicker, starting at any backlight setting other than '100'. It uses a different type of PWM dimming than the SJ8500, so it is a bit less noticeable. People sensistive to flicker should consider a nearly flicker-free alternative, like the Sony X900F.

10
Motion
Black Frame Insertion (BFI)
Optional BFI
Yes
Min Flicker for 60 fps
60 Hz
60 Hz for 60 fps
Yes
120 Hz for 120 fps
Yes
Min Flicker for 60 fps in Game Mode
60 Hz

When 'Motion Pro' is enabled, the backlight flickers to match the refresh rate of the content on the screen to reduce persistence blur. With 120 Hz content the natural refresh rate of the backlight is better, so Motion Pro' must be set to Off.

10
Motion
Motion Interpolation
Motion Interpolation (30 fps)
Yes
Motion Interpolation (60 fps)
Yes

The SK 9000 has a native 120hz panel and can interpolate lower frame rate content up to 120 fps. Motion interpolation can look very strange to people, and in scenes with fast motion, there are some artifacts.

To enable motion interpolation (also called the Soap Opera Effect) set 'TruMotion' to 'User'. For a 30fps source increase the 'De-Judder' slider, and for a 60fps source increase the 'De-Blur' slider.

7.6
Motion
Stutter
Frame Hold Time @ 24 fps
27.3 ms
Frame Hold Time @ 60 fps
2.3 ms

The LG SK9000PUA displays 60 and 24 fps content without stutter. The response time of the LCD results in smooth motion even in long panning shots.

10
Motion
24p Judder
Judder-Free 24p
Yes
Judder-Free 24p via 60p
Yes
Judder-Free 24p via 60i
Yes
Judder-Free 24p via Native Apps
Yes

The SK9000PUA is able to consistently remove judder from 24 fps content, but is inconsistent in its handling of 60 fps content.

To enable this feature, for any content, the 'Real Cinema' option must be turned on.

Update 05/02/2018: We retested 24p judder over 60p on the SK9000 and it correctly passed the test.

0
Motion
Variable Refresh Rate
Native Refresh Rate
120 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

The SK 9000 does not support any of the variable refresh rates technologies such as G-Sync, FreeSync, or the native VRR which will be available in HDMI 2.1.

Inputs
9.4
Inputs
Input Lag
1080p @ 60 Hz
15.7 ms
1080p @ 60 Hz Outside Game Mode
36.2 ms
1440p @ 60 Hz
N/A
4k @ 60 Hz
15.6 ms
4k @ 60 Hz + 10 bit HDR
23.6 ms
4k @ 60 Hz @ 4:4:4
15.1 ms
4k @ 60 Hz Outside Game Mode
44.5 ms
4k @ 60 Hz With Interpolation
86.2 ms
8k @ 60 Hz
N/A
1080p @ 120 Hz
13.8 ms
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)
No

Excellent low input lag on the SK 9000. Strangely, the input lag is slightly higher on 4k content with HDR enabled (this is the case with the C8 too), but it is still low enough that HDR games will be responsive for most games.

8.3
Inputs
Supported Resolutions
1080p @ 60 Hz @ 4:4:4
Yes
1080p @ 120 Hz
Yes (native support)
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

There were no issues with most common resolutions. The LG 55SK9000 does not support 1440p resolution. When in PC Mode with HDR enabled, the TV does not properly support 4:4:4 color and colors appear washed out. In PC Mode a sharpness setting of '0' is the true 0 level.

Inputs
Input Photos
Inputs
Total Inputs
HDMI 4
USB 3
Digital Optical Audio Out 1
Analog Audio Out 3.5mm 0
Analog Audio Out RCA 0
Component In 0
Composite In 1 (incl. adapter)
Tuner (Cable/Ant) 1
Ethernet 1
DisplayPort 0
IR In 0
SD/SDHC 0

The SK9000 does not have a component input. It supports composite input via the included adapter.

The TV does not have an analog audio output. To connect a wireless headphone you will need a digital to analog converter like this one.

Inputs
Inputs Specifications
HDR10
Yes
HDR10+
No
Dolby Vision
Yes
HLG
Yes
3D
No
HDMI 2.0 Full Bandwidth
Yes (HDMI 1,2,3,4)
HDMI 2.1
No
CEC Yes
HDCP 2.2 Yes (HDMI 1,2,3,4)
USB 3.0
No
Variable Analog Audio Out No
Wi-Fi Support Yes (2.4 GHz, 5 GHz)
Inputs
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
Yes
5.1 DTS via ARC
Yes
5.1 Dolby Digital via Optical
Yes
5.1 DTS via Optical
Yes

Update 02/27/2019: While the TV doesn't support Atmos passthrough via a Dolby TrueHD carrier signal (common in Blu-ray disks), it is advertised as supporting Atmos passthrough via Dolby Digital Plus, which is the Atmos format used by some sources like Netflix; our testing confirmed this passthrough on the LG C8. We expect this to be true for the LG SK9000.

Sound Quality
6.7
Sound Quality
Frequency Response
Low-Frequency Extension
67.27 Hz
Std. Dev. @ 70
3.49 dB
Std. Dev. @ 80
4.67 dB
Std. Dev. @ Max
7.29 dB
Max