ONN 273888 Board Hdmi Coaxial Ports Tv

( Brand: Onn ), ( Manufacturer Part Number: 273888 ), ( Compatible Brand: Onn. Roku Tv ), ( Type: Main Board ), ( Compatible Model: Model )

Review ONN Main Board Hdmi Av Coaxial Ports Tv Replacement

The **ONN 273888** is a versatile and high-performance **HDMI-to-Coaxial (RCA) AV Converter Board**, meticulously designed to bridge the gap between modern HDMI-equipped devices and traditional analog systems, ensuring seamless compatibility for home entertainment setups. This compact yet robust board features **two dedicated HDMI inputs**, allowing users to connect dual sources such as a Blu-ray player, gaming console, or streaming device simultaneously to a single coaxial output, eliminating the need for multiple cables or complex switching setups. Engineered with precision, the board supports **full 1080p high-definition resolution**, including **480i, 480p, 576i, 576p, 720p, and 1080i** formats, ensuring crystal-clear picture quality and vibrant color reproduction across all supported standards. Its **coaxial (RCA) output** delivers a clean, stable analog signal to older televisions, projectors, or AV receivers that lack HDMI connectivity, making it an indispensable solution for upgrading legacy systems without sacrificing performance.

Beyond its core functionality, the **ONN 273888** incorporates advanced signal processing to minimize latency and maintain optimal audio synchronization, a critical feature for gaming, live sports, and multimedia applications where timing precision matters. The board s **low-profile design** ensures easy installation within enclosures or behind TV stands, while its **durable construction** guarantees reliability in both home and commercial environments. Whether used in a dedicated media room, a hotel AV system, or a retro gaming setup, this converter board provides a seamless transition from digital to analog, preserving the integrity of modern high-definition content while maintaining backward compatibility with older display technologies. Ideal for tech enthusiasts, AV professionals, and anyone seeking a hassle-free way to extend their entertainment system s capabilities, the **ONN 273888** stands as a dependable bridge between past and present audio-visual standards.

Buying the **ONN 273888 board with HDMI and coaxial ports** for a TV involves several considerations. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the ONN 273888 Board**

1. **Versatile Connectivity Options**

The board supports multiple HDMI inputs (typically 2 4, depending on the model), allowing you to connect gaming consoles, Blu-ray players, streaming devices (like Roku, Fire Stick, or Apple TV), and other AV equipment. This makes it ideal for home theaters or multi-device setups.

2. **Coaxial Port for Antenna or Cable TV**

The coaxial input allows you to connect an antenna (for over-the-air TV) or a cable/satellite box, providing access to traditional broadcast channels without needing a separate tuner in the TV.

3. **Cost-Effective Upgrade**

If your TV lacks built-in HDMI or coaxial inputs, this board is a budget-friendly way to add functionality without purchasing a new TV. It s often cheaper than buying a used TV with the desired ports.

4. **Easy Installation**

The board is designed to be plug-and-play, with minimal setup required. Most users can install it themselves by connecting it to the TV s internal ports (if available) or using an external adapter.

5. **Supports Modern Resolutions**

HDMI 2.0 or later (depending on the board) supports high-definition resolutions (1080p, 4K in some cases) and formats like HDR, ensuring compatibility with newer devices.

6. **Space-Saving for Older TVs**

Older TVs (especially plasma or CRT models) may lack modern inputs. This board can extend their usability by adding HDMI and coaxial support.

7. **No Power Consumption**

Unlike some external devices, this board typically doesn t require additional power, as it draws power from the TV itself.

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### **Cons of the ONN 273888 Board**

1. **Limited HDMI Bandwidth**

Some versions of this board may only support HDMI 1.4 or earlier, which limits resolution to 1080p and may not fully support 4K or high-bitrate formats like Dolby Vision or HDR10 . Check the specifications before purchasing if you need cutting-edge features.

2. **Potential Compatibility Issues**

Not all TVs can accommodate an external HDMI/coaxial board, especially if the TV lacks internal ports for it. Some models may require soldering or professional installation, which could void warranties or damage the TV.

3. **Quality of Coaxial Signal**

The coaxial input may not always provide the best signal quality, especially for weak over-the-air broadcasts. If you rely heavily on antenna TV, you might need a signal amplifier or better antenna.

4. **No Audio Return Channel (ARC) Support**

Some HDMI boards lack ARC functionality, meaning you can t send audio from the TV back to a soundbar or AV receiver via HDMI. This is a limitation if you use HDMI-CEC or need audio routing.

5. **Potential for Overheating**

If the board is poorly ventilated inside the TV, it may overheat during prolonged use, especially with high-bitrate streams. This is rare but possible in poorly designed setups.

6. **No Warranty or Customer Support**

Third-party boards like this often lack manufacturer warranties or reliable customer support. If it fails, repairs or replacements may be difficult to obtain.

7. **Aesthetic and Space Constraints**

Installing the board may require opening the TV, which can be messy and may not be ideal for users who prefer a clean, sealed setup. Some TVs may not have enough internal space for the board.

8. **No Future-Proofing**

If you plan to upgrade to 4K or advanced audio formats (like Dolby Atmos), this board may not support them, requiring a more expensive upgrade later.

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### **Conclusion**

The **ONN 273888 board** is a practical and affordable solution for adding HDMI and coaxial inputs to a TV that lacks them, particularly for users who need basic connectivity for gaming, streaming, or cable TV. It s best suited for:

- Older TVs without modern inputs.

- Budget-conscious buyers who don t need 4K or advanced audio features.

- Users who prioritize functionality over aesthetics and are willing to handle minor installation challenges.

However, it has limitations in terms of bandwidth, compatibility, and long-term support. If you require high-end features like 4K, HDR, or ARC, you may need a more advanced (and expensive) solution.

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### **Recommendation**

- Your TV lacks HDMI or coaxial ports and you need basic functionality.

- You re connecting devices like gaming consoles, Blu-ray players, or streaming sticks that don t require 4K or advanced audio.

- You re comfortable with a DIY installation and don t mind potential compatibility trade-offs.

- You need 4K, HDR, or Dolby Vision support (look for an HDMI 2.1 board or a new TV).

- Your TV doesn t have internal ports for the board (check compatibility first).

- You rely heavily on antenna TV and need the best possible signal quality (consider a dedicated tuner).

- You prefer a hassle-free, warranty-backed solution (a new TV or a high-end AV receiver with HDMI inputs may be better).

For most casual users, this board strikes a good balance between cost and functionality, but research your specific TV model and device requirements before purchasing. If unsure, consult a technician to confirm compatibility.

Details:

Main Board with HDMI, AV, Coaxial Ports, MPN 273888 for TV Replacement.

part #: 273888 prices

• $11.50-$29.99

specifications tvboardgo:

• brand: Onn
• mpn: 273888
• compatible brand: Onn. Roku Tv
• type: Main Board
• compatible model: Model

general tvboardgo:

• TV, Video Home Audio > TV, Video Audio Parts > TV Boards, Parts Components
• condition: Used

offer tvboardgo:

• started: March 30, 2026
• best offers: True
• sold: 0
• availability: In Stock
• quantity: 1
• options: Ship-to-home

payments tvboardgo:

• money order
• credit card: Mastercard
• wallet: Google-pay
• other

shipping tvboardgo:

• transit: 4-10 Days
• class: Standard
• type: Calculated
• carrier: USPS
• cost: $8.72
• service: USPS Ground Advantage

returns tvboardgo:

• policy: No Returns

seller tvboardgo:

• city: Orlando, Florida
• rating: 100.0%
• # reviews: 36

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