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LG OLED55C66LB

Published date: 14/Sept/2026

LG OLED55C66LB

Currently unavailable

Key Features

Screen size
55"
4K Ultra HD 3840 x 2160p
Panel Type
4K OLED
Refresh Rate
120 Hz Native (VRR 165 Hz)
Sound
40 W
Response Time
Less than 0.1 ms

What Customers Say

Reviewers are impressed by how much brighter and more refined the C6's picture looks compared with the previous C5, with punchy, natural colour and deep, refined shadow detail in dark scenes. Gaming performance draws strong praise too: reviewers call it a genuinely best-in-class gaming display, with support for FreeSync, G-Sync and a high native refresh rate across all four HDMI 2.1 ports. Motion handling is smooth and natural even with non-4K sources, and testers say LG's processing does a good job upscaling older content.

The most consistent criticism is the sound: reviewers across multiple outlets say the built-in speakers have limited volume and a narrower soundstage than the picture quality deserves, with Dolby Atmos effects feeling less pronounced than expected. Reflections can also be an issue in a bright room, so reviewers recommend it for spaces where lighting can be controlled.

The overall verdict is overwhelmingly positive: reviewers call the C6 a worthy upgrade and one of the best all-round OLEDs of the year for both film and gaming use, particularly for buyers who'll pair it with a soundbar rather than rely on the built-in speakers.

Who Should Buy This

  • Gamers wanting FreeSync, G-Sync and a high native refresh rate,
  • Film fans wanting Dolby Vision, HDR10 and HLG support,
  • UK viewers wanting a built-in terrestrial, cable and satellite tuner,
  • Buyers wanting Dolby Atmos sound built in,
  • Multi-device households wanting AirPlay and Google Cast support.

Who Should Skip It

  • Energy-conscious buyers wanting a more efficient panel technology,
  • Buyers wanting confirmed built-in recording (PVR) support,
  • Home cinema buyers wanting a stated anti-reflective screen coating.

What Experts Says

Overall Assessment and Positioning

The LG OLED55C66LB is LG's mid-range C-series OLED for 2026, sitting below the flagship G6 while still using LG's latest Alpha 11 AI processor. At 55 inches with 4K resolution, it's aimed at buyers who want a genuinely premium OLED picture and serious gaming features without paying flagship prices.

Key Strengths and Standout Features

Its HDMI 2.1 ports support up to 165Hz with FreeSync, G-Sync and HGiG compatibility, making it a standout gaming display for current-generation consoles and PC gaming alike. Dolby Vision, HDR10 and HLG cover every major HDR format, and Dolby Atmos sound is built in alongside LG's AI Sound Pro up-mixing. webOS 26 runs the smart platform, with Wi-Fi 6E, Bluetooth 5.3 and a five-year software update commitment from LG.

Value Proposition and Who It's Best Suited For

This is an excellent choice for buyers who want flagship-level gaming credentials and OLED picture quality in a smaller, more affordable package, particularly anyone who already owns a soundbar or AV receiver via its eARC connection. Its Energy Class G rating is the least efficient in the range, so buyers focused purely on running costs should weigh that against the picture and gaming gains.

Similar Reviews

Video Reviews

ChoiceWise Scores: 81 Out Of 100

Picture Quality
93
Gaming & Motion
92
Energy Efficiency
45
Smart Features
79
Sound
80
Connectivity
95

The ChoiceWise Score is calculated using a defined methodology based on the features and factors that matter most in this category. Read our full scoring methodology: choicewise.app/methodology#score

Screen technology4K OLED
Resolution4K Ultra HD 3840 x 2160p
Screen size55"
HDRDolby Vision HDR10 Hybrid Log Gamma (HLG)
HDR technologyDolby Vision HDR10 Hybrid Log Gamma (HLG)
Gaming technologyFreeSync G-Sync HGiG Game Optimiser (Game Dashboard) ALLM VRR (Up to 165 Hz) Dolby Vision Gaming QFT QMS
Motion rateOLED Motion
Picture enhancementAlpha 11 AI Super Upscaling 4K
ProcessorAlpha 11 AI Processor 4K Gen3 with Dual AI Engine
Refresh rate120 Hz Native (VRR 165 Hz)
Response timeLess than 0.1 ms
Other featuresPicture modes: Personalized Picture, Vivid, Standard, Eco, Cinema Home, Game, Filmmaker, Expert (Bright Room, daytime), Expert (Dark Room, night)
Audio outputOptical digital x 1 eARC (HDMI 2)
ConnectionsHDMI 2.1 x 4 (4K 120 Hz, eARC, VRR, ALLM, QMS, QFT) USB 2.0 x 2
HDMI-CEC controlYes
WiFiWi-Fi 6E
EthernetYes
BluetoothBluetooth 5.3
Output power40 W
Sound technologyAlpha 11 AI Sound Pro (Virtual 11.1.2 Up-mix) Clear Voice Pro
No. of Speakers2.2
Sound processingDolby Atmos AC4 AC3(Dolby Digital) EAC3 HE-AAC AAC MP2 MP3 PCM apt-X (Refer to manual)
Energy efficiency class (SDR)G
Annual energy consumption82 kWh/1000h
On mode power demand (SDR)82 W
Energy efficiency class (HDR)G
On mode power demand (HDR)190 W
Standby mode power demandUnder 0.5 W
Electronic programme guide8-day EPG
TV tunerAnalogue DVB-T2 (Terrestrial) DVB-C (Cable) DVB-S2 (Satellite)
CI+ slotYes
Smart TV servicesCatch up TV: BBC iPlayer, ITVX, Channel 4, 5 Streaming: Apple TV, Amazon Prime Video, Disney+, Netflix, NOW, Paramount+, YouTube Music: Apple Music, Amazon Music, Deezer, Spotify App store Please note: Some services are only available in the UK
Screen mirroringAirPlay Google Cast
Voice controlled assistantHands-free Voice Control AI Voice ID Intelligent Voice Recognition
Smart platformwebOS 26
Smartphone appYes (LG ThinQ)
Other smart featuresLG Channels Full Web Browser Multi View Works with Apple Home Google Home, LG ThinQ AI Chatbot
Table-top standEdge slope stand (1 pole)
Stand footprint470 x 230
VESA mount300 x 200
Other featuresSleep timer Parental lock Ambient brightness sensor
PVR functionYes
Accessibility featuresHigh Contrast Gray Scale Invert Colors
Remote controlAI Magic Remote MR26GA / MR26GB (w/ Number Key, United Kingdom / Italy)
ColourBlack
WeightTV with stand: 15.9 kg TV: 14.1 kg Boxed: 21.2 kg
DimensionsTV with stand: 757 x 1222 x 230 mm (H x W x D) TV: 703 x 1222 x 45.1 mm (H x W x D) Boxed: 810 x 1360 x 187 mm (H x W x D)
Box contentsLG OLED55C66LB 55" Smart 4K Ultra HD HDR OLED TV Magic remote control Batteries Stand Screws User manual
MaterialPlastic

Frequently Asked Questions

Yes, it supports VRR up to 165Hz across all four HDMI 2.1 ports, along with FreeSync, G-Sync and ALLM for automatic game mode switching.

It supports Dolby Vision, HDR10 and Hybrid Log Gamma (HLG), covering the main formats used by UK streaming services and broadcasters.

Yes, it has built-in Dolby Atmos support alongside LG's Alpha 11 AI Sound Pro virtual up-mixing.

Yes, it has a built-in tuner covering terrestrial, cable and satellite reception, plus a CI+ slot for pay-TV access.

LG states a 5-year guarantee for this model.

It runs webOS 26, with the LG ThinQ app for smartphone control and support for Apple Home and Google Home.

LG states an Energy Class G rating for this model, the least efficient class on the current scale.

ChoiceWise does not perform hands-on product testing for this page. The expert opinion and recommendations are based on third-party reviews and sources, which we analyze and summarize using our editorial process.