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TCL 43Q51K 43" specifications and in-depth review

TCL 43Q51K 43"

Manufacturer: TCL

The TCL 43Q51K is a 43-inch QLED television built around a 4K UHD LCD panel with LED backlighting, offering a native resolution of 3840 x 2160 pixels at a pixel density of 104 ppi. It runs a full smart TV platform with built-in Chromecast, AirPlay, and voice assistant compatibility through both Google Assistant and Amazon Alexa, making it a broadly connected living room display.

On the picture side, the panel covers a wide HDR range, supporting HDR10, HDR10+, Dolby Vision, and HLG, paired with a 10-bit color depth and a claimed 1.07 billion displayable colors. The refresh rate sits at 60Hz with no adaptive sync technology listed. Audio is handled by a 2 x 10W stereo system with Dolby Atmos, DTS:X, Dolby Digital Plus, and both HDMI ARC and eARC outputs. Connectivity includes three HDMI 2.0 ports, one USB port, an RJ45 ethernet jack, Wi-Fi 5, and Bluetooth.

Pros
  • Supports all four major HDR formats — HDR10, HDR10+, Dolby Vision, and HLG — providing broad compatibility with HDR content
  • Built-in Chromecast and AirPlay allow wireless casting from both Android and Apple devices without additional hardware
  • Works with both Google Assistant and Amazon Alexa, enabling flexible voice control options
  • Includes HDMI ARC and eARC outputs alongside Digital Out, making it straightforward to connect external audio equipment
  • Anti-reflection coating and an ambient light sensor help maintain picture clarity across varying room lighting conditions
  • USB recording support adds a practical way to capture broadcast content directly to an external drive
Cons
  • Refresh rate is limited to 60Hz with no adaptive synchronization support, which may affect fast-motion clarity
  • Only one USB port is available, limiting simultaneous connections of external devices
  • No 3.5mm headphone jack means wired personal audio output requires an adapter or alternative connection
  • The remote control is not rechargeable, requiring regular battery replacements
  • Siri and Apple HomeKit are not supported, limiting integration for users within the Apple ecosystem
Who is this for?

This TV is a solid fit for everyday home viewing environments where a broad range of streaming and casting scenarios is expected. The full suite of HDR formats — including Dolby Vision and HDR10+ — makes it well-suited for users who consume a variety of HDR content across different platforms. Its built-in smart TV features, Chromecast, AirPlay, and dual voice assistant support also make it a practical choice for connected households that mix Android and Apple devices. The inclusion of USB recording and a child lock adds further appeal for family setups where content management and scheduled viewing matter.

Who is this NOT for?

Users who prioritize smooth motion in fast-paced content will likely find this TV limiting, as the 60Hz refresh rate and lack of any adaptive synchronization are not well-suited to gaming or sports viewing where fluid motion clarity is a priority. Similarly, those looking to build a tightly integrated Apple ecosystem setup will run into friction, since Siri and Apple HomeKit are not supported. The single USB port and absence of a 3.5mm headphone jack also make this a poor match for users who regularly connect multiple peripherals or rely on wired personal audio directly from the television.

Display:

display resolution 4K (UHD)
Display type QLED, LED-backlit, LCD
screen size 42.5"
resolution 3840 x 2160 px
pixel density 104 ppi
display colors 1070 million
bit depth 10-bit
refresh rate 60Hz
supports HDR10 ✓
supports HDR10+ ✓
supports Dolby Vision ✓
supports HLG ✓
Adaptive synchronization None
has anti-reflection coating ✓
has an ambient light sensor ✓
maximum horizontal viewing angle 178º
maximum vertical viewing angle 178º

The TCL 43Q51K features a 42.5-inch QLED LED-backlit LCD panel with a 4K UHD resolution of 3840 x 2160 pixels and a pixel density of 104 ppi. It renders up to 1.07 billion colors at a 10-bit depth, and the 60Hz refresh rate comes without any adaptive synchronization support. HDR coverage is broad, encompassing HDR10, HDR10+, Dolby Vision, and HLG, while both horizontal and vertical viewing angles reach 178 degrees. The panel also includes an anti-reflection coating and an ambient light sensor for automatic brightness adjustment.

Connectivity:

Has Bluetooth ✓
HDMI version HDMI 2.0
HDMI ports 3
supports Wi-Fi ✓
Wi-Fi version Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac)
USB ports 1
RJ45 ports 1
supports Miracast ✓
has a socket for a 3.5 mm audio jack ✕
has an external memory slot ✕
has a VGA connector ✕
has a DVI connector ✕

The TCL 43Q51K offers a solid range of wired and wireless connectivity options, including three HDMI 2.0 ports, one USB port, and a single RJ45 ethernet jack. On the wireless side, it supports both Wi-Fi 4 (802.11n) and Wi-Fi 5 (802.11ac), built-in Bluetooth, and Miracast for screen mirroring. There is no 3.5mm headphone jack, no external memory slot, and no VGA or DVI connector on this model.

Audio:

supports Dolby Digital ✓
audio output power 2 x 10W
supports Digital Out ✓
supports Dolby Digital Plus ✓
has SRS TheaterSound HD ✕
has stereo speakers ✓
has Dolby Atmos ✓
has Dolby Audio ✓
supports Dolby Virtual ✕
has a subwoofer ✕
has DTS:X ✓
HDMI ARC / eARC HDMI ARC, HDMI eARC

Audio on the TCL 43Q51K is handled by a stereo speaker system rated at 2 x 10W, with no subwoofer or SRS TheaterSound HD included. It supports a wide range of audio formats, including Dolby Atmos, Dolby Audio, Dolby Digital, Dolby Digital Plus, and DTS:X, though Dolby Virtual is not supported. Digital Out is available for external audio routing, and the TV includes both HDMI ARC and HDMI eARC for soundbar or receiver connectivity.

Design:

width 957.6 mm
weight 5702 g
thickness 71.1 mm
height 558.8 mm
volume 38046.099168 cm³
Supports VESA mount ✓
maximum operating temperature 35 °C
lowest potential operating temperature 5 °C

The TCL 43Q51K measures 957.6 mm wide, 558.8 mm tall, and 71.1 mm thick, with a total weight of 5702 g and a volume of approximately 38046 cm³. It supports VESA mounting for wall installation. The unit is rated to operate within a temperature range of 5 °C at the low end and 35 °C at the high end.

Features:

has Chromecast built-in ✓
has AirPlay ✓
has built-in smart TV ✓
compatible with Google Assistant ✓
works with Alexa ✓
works with Siri/Apple HomeKit ✕
supports a remote smartphone ✓
has a rechargeable remote control ✕
supports USB recording ✓
standby power consumption 0.5W
has a search browser ✓
has a sleep timer ✓
has a child lock ✓
warranty period 1 years
has voice commands ✓

The TCL 43Q51K includes a built-in smart TV platform with Chromecast and AirPlay support, along with compatibility with both Google Assistant and Amazon Alexa for voice commands; Siri and Apple HomeKit are not supported. A smartphone can be used as a remote, though the physical remote is not rechargeable. Additional features include USB recording, a built-in web browser, a sleep timer, and a child lock. Standby power consumption is rated at 0.5W, and the TV ships with a 1-year warranty.

Final Verdict

The TCL 43Q51K presents itself as a well-rounded 43-inch smart TV for general home use, with its strongest appeal lying in its comprehensive HDR format support spanning Dolby Vision, HDR10+, HDR10, and HLG, combined with a versatile smart platform that covers Chromecast, AirPlay, and both major voice assistants. It covers the everyday bases reliably — from casual streaming to family-oriented features like USB recording and child lock — though its 60Hz panel without adaptive sync and limited peripheral connectivity signal that it is designed for relaxed viewing rather than demanding or enthusiast use cases. For households seeking a straightforward, broadly compatible smart display without specialized requirements, the TCL 43Q51K delivers a coherent and practical feature set.