LG OLED42C5

The LG OLED42C5 stands out as the benchmark choice for anyone seeking a 42-inch OLED TV that combines premium picture quality with versatile usage. Positioned at the heart of LG’s 2025 lineup, this model brings together the advantages of OLED technology with the latest innovations in artificial intelligence, all while maintaining a format particularly suited to modern living spaces and demanding gaming setups.

With its α9 AI 4K Gen8 processor and full 4K 144Hz gaming compatibility, the C5 represents a measured yet significant evolution over its predecessor. This TV is aimed at both movie enthusiasts and gamers, offering a remarkable balance between technical performance and ease of use, all certified “Perfect Black” by UL and boasting 100% color fidelity validated by Intertek.

Design and Build: Mastered Slimness and Robustness

The LG C5 42-inch features the signature sleek design of the C series, with a gray/black finish that enhances the exceptional image clarity. The ultra-thin 41.1 mm screen (without stand) showcases LG’s technical expertise, while the stable central stand (718 x 170 mm) ensures a solid base on most TV furniture.

The build prioritizes quality materials, with a robust chassis weighing 9.8 kg without the stand and 10.1 kg with it. VESA 300 x 200 mm compatibility allows for easy wall mounting for those who prefer this setup. The compact dimensions of 932 x 540 x 41.1 mm (without stand) make integration into tight spaces easy.

The Magic Remote MR25GA comes with the TV, offering enhanced pointing and voice recognition features. This overall design approach favors discreet integration into the home environment while asserting a confident technical presence.

Display Technology: OLED Optimized by Artificial Intelligence

At the technological core of the C5 is a third-generation OLED Evo EX panel, using self-emissive WOLED technology that enables pixel-by-pixel brightness control. This approach guarantees absolute blacks and theoretically infinite contrast—fundamental characteristics of OLED technology that place this TV above traditional LCD technologies.

The UL “Perfect Black” certification and Intertek validation for 100% color fidelity attest to the C5’s color accuracy. The Brightness Booster algorithm, though it does not include the Micro Lens Array technology reserved for G5 models, still manages to significantly improve HDR brightness compared to the C4. Tests confirm a brightness of 1150 cd/m² versus 960 cd/m² for the C4.

The native 120Hz panel with VRR extension up to 144Hz ensures exemplary smoothness. Pixel Dimming technology and OLED Motion handling optimize the rendering of dynamic content. The OLED Color palette covers all current standards, including HDR Dolby Vision, HDR10, and HLG formats, with dynamic tone mapping via OLED Dynamic Tone Mapping Pro.

Artificial Intelligence: Personalization and Automatic Optimization

The α9 AI 4K Gen8 processor is the brain of the C5, integrating artificial intelligence algorithms into every aspect of image and sound processing. AI Picture Pro analyzes displayed content in real time to automatically adjust contrast, color, and sharpness settings according to the source type, with automatic SDR/HDR recognition.

AI Super Upscaling 4K (α9 AI Super Upscaling 4K) significantly enhances the definition of lower-resolution content. This feature is valuable for making the most of legacy content catalogs while maintaining display smoothness. AI Object Enhancing and HDR Expression Enhancing further complement this intelligent optimization.

AI Picture Wizard, AI Concierge, and AI Voice ID functions personalize usage for each user. The system recognizes individual voices and automatically adapts preferred settings, creating true interface personalization. The integration of Microsoft Copilot and generative AI extends these capabilities to advanced conversational interactions.

AI Acoustic Tuning analyzes the room’s acoustics to automatically optimize sound reproduction, while AI Sound Pro virtualizes an 11.1.2 experience from the built-in 2.0 system. These automatic optimizations greatly reduce setup time while maximizing performance.

Gaming Performance: Technical Excellence for Gaming

The 42-inch C5 particularly excels in gaming, offering full compatibility with the most demanding standards. All four HDMI 2.1 ports natively support 4K at 120Hz with PlayStation 5 and Xbox Series X consoles, while allowing up to 144Hz in VRR mode from a gaming PC.

The 0.1 ms gray-to-gray response time and minimal latency place this TV among the highest-performing gaming monitors on the market. Compatibility with G-Sync (Nvidia), FreeSync (AMD), and ALLM (Auto Low Latency Mode) ensures optimal smoothness regardless of the source equipment.

The HGIG (HDR Gaming Interest Group) mode specifically optimizes HDR rendering for video games. The built-in game optimizer offers a comprehensive dashboard for real-time performance monitoring and fine-tuning settings according to the type of game.

Support for Dolby Vision Gaming in 4K 120Hz is a notable advancement. This feature significantly enhances the rendering of compatible games, especially recent titles optimized for next-generation consoles.

WebOS 25 Interface: Connected Ecosystem and Integrated AI

The new WebOS 25 interface brings a significant overhaul to ergonomics and connected features. User profile customization allows each family member to access their apps, settings, and personalized recommendations as soon as they are identified by voice with AI Voice ID.

Native integration of Microsoft Copilot, Google Assistant and Amazon Alexa voice assistants, as well as Works with Apple Home compatibility, position the C5 as the central hub of the connected home. Hands-free voice control allows you to operate the TV and compatible devices without using the remote.

Quick Cards organize the interface by thematic sections: Sports, Remote Work, Video Games, Music, making it easy to access content based on usage. The LG ThinQ app turns your smartphone into an advanced remote, offering extended content sharing and remote configuration features.

Apple AirPlay 2 and Google Cast compatibility make streaming from mobile devices easy, while the multi-screen function allows you to display up to two different sources simultaneously. LG Channels provides direct access to over 150 free themed channels, complementing the traditional streaming offering.

Connectivity and Compatibility: Maximum Openness

The C5 offers extensive connectivity with 4 HDMI 2.1 ports, all supporting 4K 120Hz, eARC, VRR, ALLM, and QMS. HDMI port 2 includes eARC for high-quality audio transmission to compatible soundbars. The 3 USB 2.0 ports allow connection of external devices and recording via external hard drive.

Wireless connectivity includes WiFi 6 for optimal speeds and Bluetooth 5.3 for connecting audio accessories. Bluetooth Surround support enables bidirectional playback and simultaneous connection of multiple audio devices. WiSA compatibility is not included, focusing wireless options on mainstream standards.

Supported video formats include HEVC 4K@120p 10bit, VP9 4K@60p 10bit, and AV1 4K@60p 10bit, ensuring compatibility with current and future streaming platforms. QMS (Quick Media Switching) eliminates black screens when changing formats.

TV reception covers DVB-T2/T (terrestrial), DVB-C (cable), and DVB-S2/S (satellite) with HbbTV support and electronic program guide. The CI+ slot allows the use of access cards for pay-TV packages.

Audio and Acoustics: Sound Optimized by Artificial Intelligence

The integrated 2.0 audio system (20W, 2x10W) benefits from AI Sound Pro optimizations that virtualize an 11.1.2 channel experience. This technical feat impresses with its ability to create convincing spatialization from downward-facing speakers, though performance remains limited by the power and positioning of the drivers.

Dolby Atmos compatibility significantly enhances the rendering of compatible content. The Clear Voice Pro feature uses artificial intelligence for vocal remastering, effectively compensating for common mixing issues on streaming platforms. AI Clear Sound and adaptive sound control automatically optimize balance according to content.

AI Acoustic Tuning analyzes the room’s acoustics during installation to automatically adapt equalization. This automatic calibration optimizes sound according to the listening environment, though it does not replace an external audio system for demanding audiophiles.

The WOW Orchestra function allows the TV to synchronize with a compatible LG soundbar, creating an optimized hybrid audio system. Simultaneous TV/optical jack output allows you to keep the TV sound while feeding an external system.

A notable limitation is the discontinuation of DTS audio support across the entire LG 2025 lineup. This technical decision deprives users of content using this format, which is particularly common on Blu-ray discs. However, support for AC4, AC3 (Dolby Digital), EAC3, HE-AAC, AAC, MP2, MP3, PCM, WMA, and apt-X codecs covers the majority of streaming and broadcast uses.

Evolution Compared to Previous Models

The C5 represents a measured evolution over the C4 2024, focusing on improving existing features rather than technical revolution. The switch to the α9 AI Gen8 processor brings more advanced artificial intelligence optimizations, especially noticeable in user profile personalization and automatic content-based optimization.

The improvement in HDR brightness to 1150 cd/m² versus 960 cd/m² for the C4 becomes noticeable in direct comparisons. This technical progress is accompanied by the integration of WebOS 25, whose extended features significantly modernize the TV’s daily use.

Since the C2 2022, the first 42-inch model in the range, changes have remained incremental. This technical stability reflects the maturity of OLED technology in this format, with LG favoring software optimization and artificial intelligence integration over hardware upheavals.

The absence of Gen 4 Tandem OLED panels, reserved for the G5 and M5 models, clearly positions the C5 in the mid-range. This stratification maintains a performance gap that justifies the price differences between ranges.

Technical Specifications

Image and Display

• Screen type: OLED 4K
• Resolution: 4K Ultra HD (3840 x 2160)
• Refresh rate: 120 Hz native (VRR 144 Hz)
• Color palette: OLED Color
• Dimming technology: Pixel Dimming
• Motion management: OLED Motion
• Picture modes: 10 modes available

Image Processing and Artificial Intelligence

• 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)
• AI Picture Pro: Yes
• Auto calibration: Yes
• QMS (Quick Media Switching): Yes

Gaming and Video Games

• G-Sync Compatible (Nvidia): Yes
• FreeSync Compatible (AMD): Yes
• HGIG Mode: Yes
• Game 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

• Operating system: webOS 25
• Apple AirPlay 2 compatible: Yes
• USB camera compatible: Yes
• AI Chatbot: 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
• Works with Apple Home: Yes

Audio and Sound

• 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)
• Output power: 20 W
• AI Acoustic Tuning: Yes
• Audio codecs: AC4, AC3 (Dolby Digital), EAC3, HE-AAC, AAC, MP2, MP3, PCM, WMA, apt-X (see manual)
• Speaker direction: Down-firing
• Sound system: 2.0 channels
• WOW Orchestra: Yes

Connectivity

• HDMI inputs: 4 (supports 4K 120 Hz, eARC, VRR, ALLM, QMS on all 4 ports)
• HDMI audio return channel: eARC (HDMI 2)
• USB inputs: 3 (v2.0)
• Ethernet input: 1
• RF inputs (antenna / cable): 2
• SPDIF (optical digital audio output): 1
• CI slot: 1 (except UK and Ireland)
• Bluetooth: Yes (v5.3)
• Wi-Fi: Yes (Wi-Fi 6)
• Simplink (HDMI CEC): Yes

Dimensions and Weight

• TV dimensions without stand (W x H x D): 932 x 540 x 41.1 mm
• TV dimensions with stand (W x H x D): 932 x 577 x 170 mm
• Packaging dimensions (W x H x D): 1060 x 660 x 152 mm
• Stand dimensions (W x D): 718 x 170 mm
• TV weight without stand: 9.8 kg
• TV weight with stand: 10.1 kg
• Weight with packaging: 12.7 kg
• VESA mount: 300 x 200 mm

Power and Consumption

• Power supply: 100-240 V AC, 50-60 Hz
• Standby consumption: less than 0.5 W

Broadcasting and Reception

• Analog TV reception: Yes
• Digital TV reception: DVB-T2/T (terrestrial), DVB-C (cable), DVB-S2/S (satellite)