Amazon 4K50N400A
Amazon Fire TV 50" 4-Series 4K UHD Smart TV User Manual
Model: 4K50N400A
Introduction
Welcome to your new Amazon Fire TV 50" 4-Series. This manual provides detailed instructions for setting up, operating, and maintaining your smart television. Experience vivid 4K Ultra HD, HDR 10, HLG, and integrated Alexa Voice Remote for seamless entertainment.
What's in the Box
Carefully unpack your Fire TV and ensure all components are present:
- Fire TV 4-Series 50"
- Fire TV Alexa Voice Remote
- Power cord
- 2 AAA batteries (for remote)
- 4 screws (for stand attachment)
- TV stand (2 legs)
- Quick Start Guide (PDF / Accessible HTML)

Image: All components included in the Fire TV 4-Series packaging, showing the TV, two stand legs, power cord, four screws, two AAA batteries, and the Alexa Voice Remote.
Setup
1. Attaching the TV Stand
If you are not wall-mounting your TV, attach the included stand legs:
- Place the TV screen-down on a soft, clean surface to prevent scratches.
- Align each TV leg with the corresponding slots on the bottom of the TV.
- Secure each leg with two screws using a Phillips head screwdriver.
Note: The distance between the TV legs is 36.4 inches. Ensure your TV stand is wide enough.
2. Connecting Peripherals
Your Fire TV is equipped with multiple ports for connecting external devices:
- HDMI Ports: 3 HDMI 2.0 + 1 HDMI 2.1 with eARC. Use these for connecting gaming consoles, cable boxes, Blu-ray players, and soundbars. The HDMI 2.1 port supports eARC for enhanced audio return channel functionality.
- Ethernet Port: 1 Ethernet port for a wired internet connection.
- USB Port: 1 USB port for connecting USB devices.
- Digital Optical Audio Output: For connecting to external audio systems.
- Cable/Antenna Input: For connecting an antenna for over-the-air broadcasts.

Image: Detailed view of the side panel of the Fire TV, illustrating the location and type of various input/output ports such as Ethernet, multiple HDMI ports (including eARC), USB, and Optical audio out.
3. Initial Power On and Setup Wizard
- Connect the power cord to the TV and then to a power outlet.
- Insert the two AAA batteries into the Fire TV Alexa Voice Remote.
- Press the Power button on the remote to turn on the TV.
- Follow the on-screen instructions to complete the initial setup, including connecting to Wi-Fi or Ethernet, signing in with your Amazon account, and scanning for channels (if using an antenna).
Operating Your Fire TV
Using the Alexa Voice Remote
The included Alexa Voice Remote allows you to easily navigate your Fire TV and control content with your voice.
- Press the Voice button (microphone icon) and speak your command to Alexa.
- Use the Navigation ring to move through menus.
- The Select button (center of navigation ring) confirms choices.
- Dedicated app buttons provide quick access to popular streaming services.
- The remote can also control certain functions (power, volume) of compatible IR-enabled devices like soundbars and A/V receivers.
Navigating Fire TV OS
The Fire TV OS provides a user-friendly interface for accessing apps, live TV, and settings.
- The Home screen displays recommended content, recently used apps, and input selections.
- Access the Apps section to view and launch all installed applications.
- The Live TV section integrates over-the-air channels and live streaming services.
- Adjust settings such as display, audio, network, and accessibility from the Settings menu.
Streaming Content
Stream over 1.5 million movies and TV episodes from various services. Subscription fees may apply for certain services.

Image: A visual representation of the Fire TV streaming capabilities, displaying logos of popular streaming services available on the platform.
Voice Control with Alexa
Use Alexa to find, launch, and control content, or get information:
- "Alexa, find action movies."
- "Alexa, open Netflix."
- "Alexa, play The Grand Tour."
- "Alexa, turn up the volume."
- "Alexa, what's the weather?"
Maintenance
To ensure the longevity and optimal performance of your Fire TV:
- Cleaning: Gently wipe the screen with a soft, dry, lint-free cloth. For stubborn marks, use a screen-specific cleaning solution applied to the cloth, not directly to the screen. Do not use abrasive cleaners or solvents.
- Ventilation: Ensure adequate airflow around the TV. Do not block ventilation openings.
- Power: Unplug the TV from the power outlet during lightning storms or when left unattended for long periods.
Troubleshooting
If you encounter issues with your Fire TV, try the following common solutions:
| Problem | Possible Solution |
|---|---|
| No Power / TV won't turn on | Ensure the power cord is securely connected to both the TV and a working power outlet. Check if the outlet has power. Try a different outlet. |
| No Picture / Black Screen | Check the input source. Ensure connected devices are powered on. Try restarting the TV by unplugging it for 30 seconds and plugging it back in. |
| No Sound | Check the volume level on the TV and any connected audio devices. Ensure mute is not enabled. Verify audio cables are correctly connected. |
| Remote not responding | Replace the AAA batteries in the remote. Ensure there are no obstructions between the remote and the TV. Try re-pairing the remote by holding the Home button for 10 seconds. |
| Wi-Fi connection issues | Restart your Wi-Fi router. Go to Network settings on the TV and reconnect to your network. Ensure you are entering the correct password. |
Specifications
| Feature | Detail |
|---|---|
| Resolution | 3840 x 2160 (4K UHD) |
| HDR Format | HDR 10, HLG |
| Refresh Rate | 60 Hz |
| Screen Size | 50" (Viewable: 49.5") |
| HDMI Ports | 3 HDMI 2.0 + 1 HDMI 2.1 with eARC |
| Ethernet | 1 port |
| USB | 1 port |
| Audio Support | Dolby Digital Plus with passthrough of Dolby-encoded audio |
| OS | Fire TV OS |
| Product Size (without stand) | 44.2" x 25.6" x 3.5" |
| Weight (without stand) | 20.6 lb |
| VESA Wall Mount Standard | 300 mm x 300 mm |
| SKU Number | 4K50N400A |
Warranty and Support
Your Amazon Fire TV 4-Series comes with a 1-year limited warranty and service included. Optional 3-Year and 4-Year Extended Warranty plans are available for U.S. customers, sold separately.
For further assistance, explore the User Manual (this document) or visit the official Amazon Fire TV support pages. Software security updates are guaranteed for at least four years after the device is last available for purchase as a new unit on Amazon websites.
For information specific to your device, visit Manage Your Content and Devices.
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