Installation Guide
Tools Needed:
- Phillips screwdriver
- Level
- Tape measure
- Power drill (for wall mounting)
- Cable management clips
Step-by-Step Setup
- Unbox and Inspect: Carefully remove TV from packaging and check for any damage. Remove all protective films.
- Attach Stand: Place TV face down on soft surface and attach the stand using provided screws.
- Choose Location: Select a stable, level surface with proper ventilation and access to power outlet.
- Connect Power: Plug the power cord into a grounded electrical outlet.
- Connect External Devices: Connect HDMI cables for gaming consoles, streaming devices, or cable boxes.
- Connect to Internet: Use Wi-Fi or Ethernet cable to connect to your home network for Fire TV features.
- Initial Setup: Follow on-screen instructions to complete Fire TV setup and account registration.
Specifications
| Model Series | 43LF421U21 |
| Display Type | 4K UHD LED |
| Screen Size | 43 inches |
| Resolution | 3840 x 2160 pixels |
| Smart Platform | Fire TV Edition |
| HDR Support | HDR10, HLG |
| Refresh Rate | 60Hz |
| Audio Output | 20W (2x10W) |
| Connectivity | 3x HDMI, 2x USB, Ethernet, Wi-Fi, Optical Audio |
| Power Requirements | 120V, 60Hz, 80W |
| Dimensions (with stand) | 38.2" x 23.8" x 8.5" |
| Weight | 17.6 lbs |
| VESA Mount | 200x200 mm |
Warranty Information
- Full Warranty: 1 year parts and labor
- Panel Warranty: 2 years on LCD panel
- Extended Coverage: Optional protection plans available
For warranty service, contact Toshiba Customer Service at 1-800-631-3811 or visit Toshiba.com/support
Key Features
4K UHD Resolution
Experience stunning picture quality with four times the resolution of Full HD, delivering incredible detail and clarity for movies, sports, and gaming.
Fire TV Built-in
Access over 1 million movies and TV episodes from Netflix, Prime Video, Disney+, and more with the built-in Fire TV experience and Alexa voice control.
HDR Technology
High Dynamic Range support provides enhanced contrast and colors, delivering more realistic images with brighter brights and darker darks.
Alexa Voice Control
Use your voice to launch apps, search for content, control smart home devices, and more with the included Alexa Voice Remote.
DTS Studio Sound
Advanced audio processing creates virtual surround sound from the built-in speakers, delivering immersive audio without additional sound systems.
Auto Game Mode
Automatically switches to low-latency game mode when connected to compatible gaming consoles for smoother, more responsive gameplay.
Fire TV Features Explained
Live TV Picture-in-Picture
Watch live TV while browsing other content in a small window
Universal Search
Search across all your streaming services with one query
Parental Controls
Set viewing restrictions and purchase pins for family safety
Smart Home Dashboard
View and control compatible smart home devices on your TV
App Organization
Customize your app lineup and create favorites for quick access
4K Upscaling
Advanced processing enhances HD content to near-4K quality
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| TV won't turn on | Power issue, remote battery dead | Check power connection, replace remote batteries, try power button on TV |
| No picture/sound | Input selection, cable issues | Check input source, verify cable connections, restart TV |
| Wi-Fi connection issues | Network problems, signal strength | Restart router, check network settings, move closer to router |
| Remote not working | Batteries, pairing issues, obstruction | Replace batteries, re-pair remote, ensure clear line of sight |
| Apps not loading | Internet connection, app updates needed | Check internet speed, update apps, clear app cache |
| Picture quality issues | Source quality, settings incorrect | Check source resolution, adjust picture settings, enable HDR |
Common Error Codes
- No Signal: Check input source and cable connections
- Network Error: Restart router and check Wi-Fi password
- App Crash: Clear app cache or reinstall application
- Update Failed: Check internet connection and storage space
- Audio Sync Issues: Adjust audio delay in sound settings
- Remote Pairing: Hold Home button for 10 seconds to re-pair
Manual Downloads
Current Model Manuals
43LF421U21
43-inch Fire TV 4K
50LF421U21
50-inch Fire TV 4K
55LF421U21
55-inch Fire TV 4K
43LF422U21
43-inch Fire TV Pro
Popular Previous Models
43LF711U20
43-inch Fire TV 2020
43LF621U19
43-inch Fire TV 2019
43LF511U19
43-inch Basic Model
40L310U18
40-inch 2018 Model