LG SK8000 TV REVIEW

Usage Ratings - Version 1.3
7.7
Mixed Usage
Value for price beaten by
: no price info
6.4
Movies
8.0
TV Shows
7.9
Sports
8.4
Video Games
6.4
HDR Movies
7.7
HDR Gaming
8.4
PC Monitor
This TV was replaced by the LG SM8600

Type : LED
Sub-Type
:
IPS
Resolution : 4k

The LG SK8000 is a good TV for mixed usage, with only decent picture quality but very good motion handling. When viewed in the dark, the low contrast ratio results in blacks that appear gray and the local dimming is ineffective at improving dark scene performance. In a bright room though, this isn't noticeable and the image also remains accurate when viewed at an angle which is good for those with wide seating. Motion handling is also very good and the TV has excellent low input lag which is great for gamers.

Pros
  • Excellent low input lag
  • Very fast response time
  • Great reflection handling
Cons
  • Blacks appear gray and blotchy in a dark room
  • Peak brightness is only decent

Test Results
Design 9.5
Picture Quality 7.2
Motion 8.0
Inputs 9.4
Sound Quality 6.0
Smart Features 8.2
  1. Update 2/28/2019: Converted to Test Bench 1.3. Learn more about our versioned test bench system here.
  2. Update 6/12/2018: The 49" SK8000 has a 60Hz panel, and some results will be different

Check Price

9.5

Design

Curved : No

The design of the LG 55SK8000PUA / LG 65SK8000PUA is excellent. It resembles a lot the SK9000 and esteems a slight premium feel. Although the TV is thin and looks good, when wall mounted, you might find it difficult to reach some of the inputs that are facing outwards. There is some basic cable management down the rear of the stand, but when the TV is wall mounted, there is practically no cable management. The build quality is good.

Stand

The LG 55SK8000PUA stand is curved and made of metal. It's almost identical to the SK9000 and provides a good and sturdy support to the TV. This won't prevent the TV from wobbling a little if knocked on the side.

The footprint of the 55" TV stand: 32.6" x 9.8"

Back
Wall Mount : VESA 300x300

The back of the TV is very thin metal and quite plain. Cable management is done through a single hook just like the LG SK9000. However, in this TV, many of the inputs are pointing outwards and are difficult to access when placed close to a wall.

Borders
Borders : 0.47" (1.2 cm)

The borders are thin and look good. They are similar in width to the SJ8500, and are made of metal and feel high quality.

Thickness
Max Thickness : 2.64" (6.7 cm)

The LG SK8000 is very thin at the top but slightly wider at the bottom where the LEDs are located.

Temperature
Maximum Temperature
:
104 °F (40 °C)
Average Temperature
:
91 °F (33 °C)

The TV gets slightly warm at the bottom edge of where the LEDs are encased. This should not cause any trouble though.

7.5 Build Quality

The build quality of the LG SK8000PUA is good. There are no gaps and everything seems to fall well into place. The metal back is very thin and shows bumps and nicks very easily.

7.2

Picture Quality

The LG SK8000 has a decent picture quality. With a mediocre contrast ratio, blacks will show grayish in dark rooms and the TVs local dimming capability is unable to help due to its vertical local dimming zones. We recommend keeping it  'Off'. It is not as bright as the SK9000, and small highlights are easily missed. As with most IPS panels the viewing angle is mediocre. Although it is better than most VA panel TVs like the X900F, it still falls behind OLED  TVs. The reflection handling is great, making it a good choice for wide viewing environments, but there is some noticeable dirty screen effect which will not please sports fans.

6.2 Contrast
Native Contrast
:
1098 : 1
Contrast with local dimming
:
1100 : 1

The native contrast of the LG SK8000 is mediocre and towards the lower end of IPS panel contrasts we tested in the last two years.

If watched in a dark room, blacks will look grayish, but in bright environments, this will not be so obvious.

When local dimming is on there is not much improvement in contrast and this is due to poor local dimming performance.

1.5 Local Dimming
Local Dimming
:
Yes
Backlight
:
Edge

Local dimming performance is poor. This is due to the way local dimming is performed on this TV. The zones are vertical and thus it can not work effectively with images that interchange bright dark areas vertically.

We recommend that you leave the local dimming setting to medium and if you find that the screen brightness changes are bothering you, then you should turn it to off.

6.4 SDR Peak Brightness
SDR Real Scene Peak Brightness
:
240 cd/m²
SDR Peak 2% Window
:
81 cd/m²
SDR Peak 10% Window
:
169 cd/m²
SDR Peak 25% Window
:
249 cd/m²
SDR Peak 50% Window
:
280 cd/m²
SDR Peak 100% Window
:
280 cd/m²
SDR Sustained 2% Window
:
81 cd/m²
SDR Sustained 10% Window
:
169 cd/m²
SDR Sustained 25% Window
:
248 cd/m²
SDR Sustained 50% Window
:
279 cd/m²
SDR Sustained 100% Window
:
279 cd/m²
SDR ABL
:
0.083

The SDR peak brightness is okay. The LG SK8000 like other IPS panels might appear dim in bright rooms. The brightness rises slightly as the bright area increases but is low in very dark scenes.

The real scene brightness is measured near the edge of the screen, which isn't as bright as the center.

6.1 HDR Peak Brightness
HDR Real Scene Peak Brightness
:
271 cd/m²
HDR Peak 2% Window
:
523 cd/m²
HDR Peak 10% Window
:
523 cd/m²
HDR Peak 25% Window
:
412 cd/m²
HDR Peak 50% Window
:
333 cd/m²
HDR Peak 100% Window
:
332 cd/m²
HDR Sustained 2% Window
:
233 cd/m²
HDR Sustained 10% Window
:
277 cd/m²
HDR Sustained 25% Window
:
330 cd/m²
HDR Sustained 50% Window
:
331 cd/m²
HDR Sustained 100% Window
:
331 cd/m²
HDR ABL
:
0.024

HDR peak brightness is mediocre and falls short from the target of 1000 cd/m² throughout the whole range of window sizes. Again the real scene is dimmer than the 100% window mostly due to the edge of the screen being dimmer than the center.

7.1 Gray Uniformity
50% Std. Dev.
:
4.481 %
50% DSE
:
0.196 %
5% Std. Dev.
:
0.542 %
5% DSE
:
0.107 %

The gray uniformity of the LG SK8000PUA is decent. In the 50% gray image, some clouding and uniformity issues are visible even to the untrained eye. And some dirty screen effect is expected when watching sports.

Things are better in the 5% gray image where the image is much more uniform except some hardly noticeable clouding at the center.

6.9 Viewing Angle
Color Washout
:
27 °
Color Shift
:
44 °
Brightness Loss
:
32 °
Black Level Raise
:
70 °
Gamma Shift
:
32 °

The LG SK8000 has an almost identical performance to SK9000 with regards to the viewing angle. It is not bad since it performs better than most VA panels, but falls short of OLEDs. Colors and brightness shift as the angle increases so it is not the best choice for viewing at an angles.

3.8 Black Uniformity
Native Std. Dev.
:
2.851 %
Std. Dev. w/ L.D.
:
5.223 %

Black uniformity is poor with clouding being apparent all over the screen. The situation remains similarly bad when local dimming is 'on'. This is again due to the local dimming zones. There are only vertical local dimming zones and thus they fail to dim the areas above and below the test cross.

8.8 Reflections
Screen Finish
:
Semi-gloss
Total Reflections
:
2.8 %
Indirect Reflections
:
0.5 %

The reflection handling is excellent and almost identical to the SK9000. The semi-gloss finish diffuses reflections, reducing their overall intensity resulting in a comfortable viewing experience in most rooms.

8.5 Pre Calibration
White Balance dE
:
2.56
Color dE
:
1.83
Gamma
:
2.14
Color Temperature
:
6501 K
Picture Mode
:
Expert (Dark Room)
Color Temp Setting
:
Warm 2
Gamma Setting
:
2.2

Remarkable pre-calibration out of the box, the best results were obtained with the 'Expert (Dark Room)' picture mode. Color and White Balance dE were good, and the color temperature was almost spot on 6500K. The color and white balance delta is low enough that most people won't notice.

9.5 Post Calibration
White Balance dE
:
0.10
Color dE
:
1.37
Gamma
:
2.19
Color Temperature
:
6509 K
White Balance Calibration
:
20 point
Color Calibration
:
Yes
Auto-Calibration Function
:
Yes

After calibration, the LG SK8000 is almost perfect as it achieves excellent white balance, excellent color temperature small color dE and a gamma almost 2.2. It's only at very low brightness that the TV can not follow the PQ line, but this will not be noticed by many people.

You can see our recommended settings here.

8.0 480p Input

There were no obvious issues upscaling older 480p content like DVDs on the LG 55SK8000PUA / LG 65SK8000PUA.

8.0 720p Input

720p content is scaled well with no obvious over softening or artifacts on the SK9000.

9.0 1080p Input

1080p content such as Blu-rays are upscaled well. Details look good and the image is sharp.

10 4k Input

Native 4k content is clear and sharp.

7.5 Color Gamut
Wide Color Gamut
:
No
DCI P3 xy
:
83.88 %
DCI P3 uv
:
88.83 %
Rec 2020 xy
:
61.06 %
Rec 2020 uv
:
66.45 %

The TV has a good color coverage. Its coverage of the DCI P3 color space is similar to last years SJ8500 both when measured at the CIE 1931 xy space and at the CIE 1976 u' v'.

Its coverage of the Rec 2020 color space falls just short of our threshold of 67% to call it a wide color gamut support. It is able to produce more saturated colors than SDR TVs, but it isn't as wide as many other HDR TVs.

The TV's EOTF follows the HDR PQ well up to the 60% input signal. At higher levels of input signal some compression is present but this should not be a problem for most people.

This EOTF was measured in the Cinema picture mode, the EOTFs for Game mode and PC mode are here and here and are almost identical so similar results should be expected.

6.0 Color Volume
Normalized DCI P3 Coverage ITP
:
66.4 %
10,000 cd/m² DCI P3 Coverage ITP
:
30.3 %
Normalized Rec 2020 Coverage ITP
:
54.5 %
10,000 cd/m² Rec 2020 Coverage ITP
:
25.7 %

Sub-par color volume and a little worse than last year's SJ8500. The TV can not accurately display very dark colors, and its black level is negatively affected because of its IPS panel.

8.6 Gradient
Color Depth
:
10 Bit
Red (Std. Dev.)
:
0.098 dE
Green (Std. Dev.)
:
0.114 dE
Blue (Std. Dev.)
:
0.076 dE
Gray (Std. Dev.)
:
0.082 dE

The TV shows gradients smoothly in most content, but in certain content like our gradient test photo the gradient is not smooth at all, producing very visible banding in many places. Our gradient test results used in the score are measured by showing one color slide at a time, and in this case the TV has great gradient performance; we also played a scene from the HDR movie The Martian that has gradients in its skies, and the TV showed these smoothly as well. In light of this it seems that the TV can show smooth gradients in most content, but there are rare cases where gradients aren't shown well at all; in these cases setting the TV's MPEG Noise Reduction feature to Low in HDR can help to smooth out gradients, at the cost of losing some small detail in scenes.

7.4 Temporary Image Retention
IR after 0 min recovery
:
0.85 %
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 LG 55SK8000 / LG 65SK8000 do have some image retention issues. After the 10 minutes burn-in scene, as we can see on our test picture, the image retention is easily noticeable. This isn't an issue for most content though, and the good news is that after 2 minutes of recovery the retention is gone.

10 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.

Pixels
8.0

Motion

The LG SK8000PUA has great motion handling. It has an excellent response time, better than the LG SK9000, and there is very little motion blur. The backlight uses PWM to dim, and there is visible flicker due to the relatively low flicker frequency (120 Hz). There is an optional black frame insertion feature which can help reduce stutter and it can reduce the flicker as low as 60 fps. The TV can interpolate lower refresh rate content up to 120 fps. It does not support VRR or AMD's Freesync 2.

9.0 Response Time
80% Response Time
:
4.0 ms
100% Response Time
:
13.0 ms

Excellent response time on the LG SK8000. There is some overshoot but it is minor and will cause only some small inverted trails following fast moving objects.

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

The LG SK8000 uses PWM to dim the backlight at all brightness levels. The PWM frequency is a relatively low 120 Hz, and people sensitive to flicker might notice it more than other TVs like the TCL R617 which uses a higher flicker frequency.

10 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

The LG SK8000 has an optional BFI mode which reduces the flicker frequency to 60 Hz. With 120 fps content the flicker frequency can be reduced by reducing the backlight intensity. For 60 fps content, set 'TruMotion' to 'User', and 'Motion Pro' to 'On'

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

The LG 55SK8000PUA / LG 65SK8000PUA can interpolate lower frame rate content up to 120 Hz. In scenes with fast motion there are artifacts, and if the motion gets too intense, the TV stops interpolating.

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.

Update 06/12/2018: The 49" SK8000 has a 60Hz panel, and will only be able to interpolate up to 60 Hz.

7.3 Stutter
Frame Hold Time @ 24 fps
:
28.7 ms
Frame Hold Time @ 60 fps
:
3.7 ms

The fast response time of the LG SK8000PUA means 24p content is held static on screen for long enough that motion can appear to stutter. This is especially noticeable with wide panning landscape shots.

If this bothers you, motion interpolation can be enabled to increase the frame rate of the content, although this introduces the Soap Opera Effect that some people don't like.

10 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 TV is judder free when playing native 24p content from a Blu-ray player and from other sources (cable/satellite boxes and native streaming apps). To remove judder, the real cinema option must be enabled in the Picture Option Settings menu.

0 Variable Refresh Rate
Native Refresh Rate
:
120 Hz (except 49")
Variable Refresh Rate
:
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 LG SK8000 does not support any of the Variable Refresh Rate technologies like AMD's Freesync. This is expected as LG has not announced any plans to support these.

9.4

Inputs

The LG SK8000 LED TV has excellent low input lag. Even outside of game mode, the input lag is low enough for most gamers. Input lag is slightly higher when chroma 4:2:0 is used in HDR, this shouldn't be an issue. Most of the common resolutions are supported. It does not support 1440p.

9.5 Input Lag
1080p @ 60 Hz
:
14.2 ms
1080p @ 60 Hz Outside Game Mode
:
34.7 ms
1440p @ 60 Hz
:
N/A
4k @ 60 Hz
:
14.2 ms
4k @ 60 Hz + 10 bit HDR
:
22.5 ms
4k @ 60 Hz @ 4:4:4
:
14.3 ms
4k @ 60 Hz Outside Game Mode
:
43.1 ms
4k @ 60 Hz With Interpolation
:
84.7 ms
8k @ 60 Hz
:
N/A
1080p @ 120 Hz
:
14.0 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

The LG SK8000 has excellent low input lag, slightly better than the LG SK9000 and the TCL R617. Gamers and people who plan on using it as a monitor will find the TV very responsive.

When Chroma 4:2:0 is used in HDR there is an extra 120 Hz frame (8.3 ms) of input lag. The reason for this is unknown but the input lag results are similar to other 2018 LG TVs including the C8 and SK9000.

  • 4k @ 60Hz @ 4:2:0 + 10 bit HDR: 22.5 ms
  • 4k @ 60Hz @ 4:2:0 + 8 bit HDR: 22.5 ms
  • 4k @ 60Hz @ 4:2:2 + 8 bit HDR: 14.1 ms
  • 4k @ 60Hz @ 4:4:4 + 8 bit HDR: 14.4 ms

In PC mode, the input lag is extremely low regardless of picture mode and the SK8000 is very responsive. Outside of Game or PC mode the input lag is a bit higher, but still good enough for most gamers.

8.3 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

The LG SK8000 supports most of the common resolutions without issue. 4k @ 60 Hz @ 4:4:4 or 4:2:2 is only supported when HDMI ULTRA HD Deep Color is enabled for the input used, like most TVs.

Update 06/12/2018: The 49" SK8000 has a 60 Hz panel, and does not support 120 Hz input.

Input Photos

Similar inputs to the LG SK9000 but more of the outputs are out the back of the TV. Like the SK9000 there is no analog audio output so an external adapter is required to connect wireless headphones like this one.

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
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)
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 SK8000.

6.0

Sound Quality

The LG SK8000 is has a mediocre sound. This TV doesn't get loud and doesn't have an extended bass, so it doesn't produce any thump or rumble. But its bass does have a decent amount of punch and produces clear dialogs. For a better sound, dedicated speakers or a soundbar is recommended.

5.9 Frequency Response
Low-Frequency Extension
:
84.76 Hz
Std. Dev. @ 70
:
3.91 dB
Std. Dev. @ 80
:
4.70 dB
Std. Dev. @ Max
:
6.81 dB
Max
:
84.0 dB SPL
Dynamic Range Compression
:
4.79 dB

The frequency response of the LG SK8000PUA is sub-par. Low-frequency extension (LFE) is at 85Hz, which is above-average. This means that the bass of this TV won't produce any thump or rumble, but will have a decent amount of punch. The frequency response above the LFE point is decent and relatively well-balanced so it produces clear dialogs, but there will be some pumping and compression present at louder volumes, even though this TV doesn't get loud. Also, although this TV comes with a room correction system, it wasn't able to remove the modes of our test room around 200Hz.

6.4 Distortion
Weighted THD @ 80
:
0.565
Weighted THD @ Max
:
1.040
IMD @ 80
:
3.13 %
IMD @ Max
:
7.93 %

The distortion performance is about average. The overall amount of produced THD is a bit elevated, but it doesn't increase significantly under maximum volume. However, this TV doesn't get loud.

8.2

Smart Features

Smart OS : WebOS
Version : 4.0

The LG SK8000 runs the latest version of LG's webOS smart interface. It has a decent selection of built-in apps covering most of the common uses. The built-in movie, music, and photo viewers play most of the popular formats and are easy to use. The LG Content Store is easy to navigate and has thousands of available apps, but there are ads and suggested content throughout and they can't be disabled.

8.5 Interface