TCL 55A400U-UK 55 Inch A400U 4K Ultra HD HDR QD-Mini LED Smart Google TV 2026

TCL 55A400U-UK 55 Inch A400U 4K Ultra HD HDR QD-Mini LED Smart Google TV 2026

The TCL A400U QD-Mini LED TV is built for home cinema enthusiasts who want stunning picture quality without spending a fortune. It solves the problems of blooming and poor black levels in standard LED TVs by using 448 precise dimming zones and 2500 nits peak brightness, delivering deep blacks and bright highlights that rival much more expensive TVs. With 93% DCI-P3 colour gamut, All-Domain Halo Control that eliminates halo effects, and ONKYO 2.0 Hi-Fi audio, you get exceptional performance at a sensible price.

QD-Mini LED with 448 Precise Dimming Zones
QD-Mini LED combines the merits of QLED and OLED technologies, transforming traditional backlighting into lighting close to pixel-level precision. The A400U delivers 448 dimming zones for deeper blacks and higher brightness.

Dark scenes look genuinely black without blooming, and bright highlights pop with clarity. You get OLED-like contrast with higher peak brightness and a longer lifespan.

2500 nits Peak Brightness
The A400U delivers up to 2500 nits peak brightness with an ultra-high contrast ratio of 25,000,000:1, revealing rich details in both highlights and shadows that are invisible on lower-brightness TVs.

HDR content looks stunning, with bright scenes that dazzle and dark scenes that retain every detail.

93% DCI-P3 Ultra-Wide Colour Gamut
Utilising Quantum Dot technology, the A400U unveils over 1 billion hues of vibrant, precise colours, providing up to 93% colour gamut according to the DCI-P3 standard.

Your favourite films and shows look more lifelike with deeper reds, truer blues and more natural greens.

All-Domain Halo Control Technology
All-Domain Halo Control covers the entire path from light generation to imaging, integrating a powerful light-emitting chip, condensed micro lens, Micro-OD, dynamic lighting bionic algorithm and CSOT HVA panel technology.

Halos around bright objects on dark backgrounds are virtually eliminated. This is Mini LED done right.

Powerful Light-Emitting Chip
Compared with previous generation conventional chips, the A400U's powerful light-emitting chip significantly improves brightness and energy efficiency, reproducing natural bright and dark scenes with clarity.

You get better picture quality while using less energy, saving you money on electricity bills.

Condensed Micro Lens
TCL's self-developed condensed micro lens technology precisely controls light direction through its arch bridge dimming design, greatly improving backlight uniformity and halo control capabilities with an 8 times increase in optical stability.

Picture details are clearer, with improved halo control and consistent backlight performance.

Micro-OD for Better Image Quality, Thinner Body
With TCL's powerful Mini LED optical technology, Micro-OD offers a slimmer TV unit while significantly reducing the Mini LED halo issue.

Stars in the night sky look deep, delicate and sharp, and the TV looks elegant on your wall.

CSOT HVA Panel Technology with 7000:1 Native Contrast
CSOT's HVA panel technology forms a butterfly-wing-shaped microstructure that enables precise control over light passing through the liquid crystal layer, delivering up to 7000:1 native contrast.

Dark areas appear even darker, significantly enhancing the screen's contrast ratio and delivering a more vivid, immersive visual experience.

Bionic Colour Optimisation Technology
This technology intelligently analyses image content and enhances scene colours with remarkable precision while restoring and protecting natural skin tones.

Scenes look more vivid and immersive, but faces stay natural and believable.

ONKYO 2.0 Hi-Fi System with Lateral Wide Sound Field
Onkyo brings 80+ years of home theatre expertise. The lateral wide sound field acoustic design widens the sound field by 35% with side-firing mid-field speakers.

Dialogue stays clear and sound effects are immersive. You get powerful audio that matches the stunning picture quality.

144Hz Native Refresh Rate with 288Hz VRR Gaming
The A400U delivers dual-mode ultra-high refresh rates: native 4K at 144Hz and 1080P at 288Hz, plus AMD FreeSync Premium Pro, ALLM and HDMI 2.1.

Gaming is incredibly smooth with less stuttering, tearing or blurring. Gamebar provides customised settings for all three major consoles.

Google TV with Gemini AI
TCL is the first TV brand to launch with Google Gemini. Gemini helps you discover new shows, answer questions, control your smart home, and create custom AI art in 4K.

Your TV becomes an entertainment hub, smart home controller, information source and creative tool all in one.

TSR AiPQ Processor
The TSR AiPQ processor delivers pixel-level optimisation with AI ClarityMaster, AI ContrastMaster, AI ColourMaster and AI MotionMaster.

Every frame bursts with vibrant dynamism, layered depth and natural clarity.

39.9mm Ultra-Slim Flat Design
The A400U features a 39.9mm integrated flat and slim design with nearly seamless 3mm-gap wall mounting and the Star Ring Cooling System.

Your TV looks like a canvas of art on your wall, blending effortlessly into any home décor.

Key Features at a Glance

• QD-Mini LED with 448 precise dimming zones
• 2500 nits peak brightness
• 93% DCI-P3 ultra-wide colour gamut – over 1 billion hues
• All-Domain Halo Control Technology – eliminates blooming
• CSOT HVA panel with 7000:1 native contrast ratio
• Powerful light-emitting chip – improved brightness and efficiency
• Condensed micro lens – 8x optical stability increase
• Micro-OD for slimmer design and reduced halo
• Bionic Colour Optimisation – scene enhancement and skin tone preservation
• ONKYO 2.0 Hi-Fi with lateral wide sound field (35% wider)
• 144Hz native refresh rate / 288Hz VRR Game Accelerator
• AMD FreeSync Premium Pro, ALLM and HDMI 2.1
• Gamebar with customised console settings
• Google TV with Gemini AI
• TSR AiPQ Processor with AI optimisation
• 39.9mm ultra-slim design with Star Ring Cooling System
• Art Gallery, Digital Art (100,000+ artworks) and Ambient Mode

Premium Performance Without the Premium Price

The TCL A400U QD-Mini LED TV is an excellent choice for home cinema enthusiasts who want stunning picture quality, smooth gaming performance and smart features without spending a fortune. With 448 precise dimming zones, 2500 nits peak brightness, 93% DCI-P3 colour, ONKYO 2.0 Hi-Fi audio, 144Hz gaming and Google TV with Gemini AI, it delivers premium performance at a price that makes sense. Perfect for anyone who wants great entertainment without compromise.

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