LG OLED77C5

The LG OLED77C5 marks a significant milestone in the evolution of LG’s C series. This 77-inch TV features, for the first time, the α9 AI 4K Gen8 processor, bringing substantial improvements in HDR brightness and image processing. Aimed at demanding movie enthusiasts and passionate gamers, this 2025 model retains the traditional OLED strengths while addressing some of its predecessor’s limitations.

Technological Innovation and New Processor

At the heart of the OLED77C5 lies the α9 AI 4K Gen8 processor, a major upgrade over the Gen7 found in the C4 model. This next-generation chip optimizes real-time image processing using artificial intelligence, enabling more precise content analysis and automatic adjustment of settings based on the type of media being viewed.

AI Super Upscaling 4K benefits from this increased computing power to reprocess lower-resolution content with remarkable accuracy. Dynamic Tone Mapping Pro, combined with AI Brightness Control, automatically adjusts brightness and contrast according to ambient lighting conditions and content type.

The Brightness Booster is one of the most notable innovations of this generation. This technology allows HDR brightness peaks close to 1400 nits in Vivid mode, a significant improvement over the C4. This advancement puts the C5 in a better position against competing Mini-LED TVs, without compromising the absolute blacks characteristic of OLED.

Refined OLED evo Picture Quality

The C5’s OLED evo panel maintains the expected standards of excellence, with self-emissive pixels ensuring theoretically infinite contrast. Absolute blacks remain perfect, while OLED Color technology delivers certified color reproduction faithful to creators’ intentions.

HDR support includes Dolby Vision, HDR10, and HLG formats, offering broad compatibility with major streaming platforms. Filmmaker Mode preserves the original calibration of cinematic works by disabling all artificial processing. However, the absence of HDR10+ is a limitation for Amazon Prime Video users, as this format is preferred on that platform.

The native 120 Hz refresh rate, combined with OLED Motion Smoothing, ensures optimal fluidity for high-frame-rate sports and cinematic content. The motion processing technology automatically adapts to the content type to avoid the unwanted soap opera effect in movies.

Next-Generation Gaming Performance

Gaming is one of the OLED77C5’s most remarkable strengths. Support for Variable Refresh Rate up to 144 Hz places this TV among the few mainstream models to offer such a frequency. This capability is especially relevant for high-performance PC gaming and future consoles.

Nvidia G-Sync and AMD FreeSync Premium compatibility eliminate screen tearing and stuttering, even during significant framerate fluctuations. The claimed response time under 0.1 ms rivals dedicated gaming monitors, delivering exemplary responsiveness for competitive genres.

ALLM (Auto Low Latency Mode) automatically detects console signals and switches to Game Optimizer mode without manual intervention. Support for Dolby Vision Gaming at 120 Hz is a notable first, combining smoothness and HDR quality for compatible titles.

The Game Dashboard centralizes all gaming settings and displays real-time performance information. This dedicated interface simplifies access to VRR, HDR, and display mode settings according to the type of game being played.

Audio and Sound Synchronization

The 2.2-channel audio system delivers a total output of 40 watts, split between two main 10-watt speakers and a built-in 20-watt subwoofer. The downward-firing configuration optimizes sound diffusion from the base of the TV.

AI Sound Pro 11.1.2 virtualizes a multichannel sound environment from the built-in speakers. This technology analyzes audio content in real time to adapt processing for dialogue, music, or sound effects. Clear Voice Pro specifically enhances voice intelligibility through AI-powered remastering.

The WOW Orchestra feature is the audio system’s main asset. This technology synchronizes the TV’s speakers with a compatible LG soundbar, creating a cohesive acoustic ensemble. This approach avoids sound redundancy and optimizes frequency distribution among the different elements.

Design and Seamless Integration

The OLED77C5’s design favors understated elegance with a two-tone gray and black finish. The ultra-thin profile characteristic of OLED panels (47.1 mm) allows for discreet integration, especially when wall-mounted.

The central stand ensures optimal stability while freeing up lateral space for other equipment. The base dimensions (520 × 267 mm) remain compact relative to the screen’s diagonal. VESA 300 × 200 mm compatibility makes wall mounting easy with most brackets on the market.

The AI Magic Remote has been updated with a more precise pointer and improved navigation wheel. Hands-free voice control works directly from the TV without needing the remote, simplifying daily interaction.

The weight of 23.5 kg without the stand is reasonable for this screen size, making installation easier. The F energy class reflects the typical consumption of large OLED panels, with 125 kWh for 1,000 hours of use.

webOS 25 Smart Platform

The webOS 25 system brings substantial improvements in personalization and artificial intelligence. The interface automatically adapts to viewing habits thanks to AI Genre Selection, offering optimized content and settings based on detected preferences.

Extended compatibility includes Apple AirPlay 2, Google Cast, and voice assistants Google Assistant and Amazon Alexa. The Home Dashboard centralizes the management of compatible connected devices, turning the TV into a smart home hub.

The LG ThinQ app allows remote control and advanced configuration from a smartphone. This two-way connectivity makes it easy to share content and manage settings without interrupting viewing.

The Always Ready feature keeps certain functions active even in standby, allowing information display or voice command reception. This approach balances convenience and energy consumption.

Connectivity and Extended Compatibility

All four HDMI 2.1 ports fully support 4K 120 Hz with VRR, ALLM, and QMS. This uniform configuration avoids the limitations of some competitors who reserve these features for specific ports.

The eARC port on HDMI input 2 ensures high-definition audio transmission to compatible soundbars and amplifiers. Supported audio codecs include Dolby Atmos, DTS, and high-resolution PCM formats.

Wi-Fi 6 and Bluetooth 5.3 wireless connectivity ensure optimal speeds for 4K streaming and connecting audio accessories. The three USB 2.0 ports allow playback from external drives and connection of USB cameras for video calls.

The CI+ input (except in the UK and Ireland) maintains compatibility with traditional satellite and cable decoders. This versatility is valuable in setups requiring a gradual transition to all-IP.

Technical Specifications

Screen and Display

• Screen type: OLED 4K
• Resolution: 4K Ultra HD (3840 × 2160)
• Refresh rate: 120 Hz native (VRR 144 Hz)
• Wide color gamut: OLED Color
• Dimming technology: Pixel-level dimming

Image Processing

• Image processor: α9 AI 4K Gen8 processor
• AI upscaling: α9 AI Super Upscaling 4K
• Dynamic tone mapping: Yes (OLED Dynamic Tone Mapping Pro)
• AI genre selection: Yes (SDR / HDR)
• AI brightness control: Yes
• HDR (High Dynamic Range): Dolby Vision, HDR10, HLG
• FILMMAKER MODE: Yes
• HFR (High Frame Rate): 4K 120 fps (HDMI, RF, USB)
• Motion smoothing: OLED Motion
• Picture modes: 10 modes
• AI Picture Pro: Yes
• Auto calibration: Yes
• QMS (Quick Media Switching): Yes

Gaming

• G-Sync compatible (Nvidia): Yes
• FreeSync compatible (AMD): Yes
• HGIG mode: Yes
• Gaming optimizer: Yes (gaming dashboard)
• ALLM (Auto Low Latency Mode): Yes
• VRR (Variable Refresh Rate): Yes (up to 144 Hz)
• Dolby Vision for gaming (4K 120 Hz): Yes
• Response time: Less than 0.1 ms

Smart TV Features

• Apple AirPlay 2 compatible: Yes
• Operating system: webOS 25
• USB camera compatible: Yes
• AI conversational agent: Yes
• Always Ready: Yes
• Web browser: Yes
• Google Cast: Yes
• Google Home / Hub: Yes
• Hands-free voice control: Yes
• Home dashboard: Yes
• Intelligent voice recognition: Yes
• LG Channels: Yes
• Magic Remote: Included
• Multi-view: Yes
• Remote control via mobile app: Yes (LG ThinQ)
• Voice ID: Yes
• Apple Home compatible: Yes

Audio

• Dolby Atmos: Yes
• AI Sound: α9 AI Sound Pro (11.1.2 virtual surround)
• Clear Voice Pro: Yes (AI voice remastering)
• LG Sound Sync: Yes
• Sound sharing mode: Yes
• Simultaneous audio output: Yes
• Bluetooth Surround Ready: Yes (bidirectional playback)
• Audio power: 40 W
• AI acoustic tuning: Yes
• Audio codecs: AC4, AC3 (Dolby Digital), EAC3, HE-AAC, AAC, MP2, MP3, PCM, WMA, apt-X (see manual)
• Speaker orientation: Down-firing
• Audio system: 2.2 channels
• WOW Orchestra: Yes

Connectivity

• HDMI Audio Return Channel: eARC (HDMI 2)
• Bluetooth support: Yes (v 5.3)
• Ethernet input: 1
• Simplink (HDMI CEC): Yes
• SPDIF (optical digital audio out): 1
• CI slot: 1 (except UK and Ireland)
• HDMI inputs: 4 (supports 4K 120 Hz, eARC, VRR, ALLM, QMS on all 4 ports)
• RF inputs (antenna / cable): 2
• USB inputs: 3 (v 2.0)
• Wi-Fi: Yes (Wi-Fi 6)

Dimensions and Weight

• TV dimensions without stand (W × H × D): 1711 × 982 × 47.1 mm
• TV dimensions with stand (W × H × D): 1711 × 1035 × 267 mm
• Package dimensions (W × H × D): 1879 × 1130 × 228 mm
• Stand dimensions (W × D): 520 × 267 mm
• TV weight without stand: 23.5 kg
• TV weight with stand: 27.1 kg
• Weight with packaging: 38.5 kg
• VESA mount: 300 × 200 mm

Power

• Power supply (voltage, frequency): AC 100-240 V 50-60 Hz
• Standby power consumption: Less than 0.5 W

Accessibility

• High contrast: Yes
• Grayscale: Yes
• Color inversion: Yes