LG MGJ673707 Board Tv NANO75 NANO80 UQ90 EAX69083501 EAX69083503

( Brand: Lg ), ( Manufacturer Part Number: MGJ673707 ), ( Compatible Brand: For Lg ), ( Type: Main Board ), ( Compatible Model: Nano75, Nano80, Uq90 )

Review LG Main Board Tv

The **LG MGJ673707 Main Board** is a high-performance, precision-engineered replacement motherboard designed exclusively for LG s **Nano 75" and Nano 80" UQ90 Series OLED TVs**, as well as select **EAX69083501 and EAX69083503** models, ensuring seamless compatibility and optimal functionality. Crafted with LG s signature engineering excellence, this board serves as the central hub for all critical TV operations, integrating advanced processing, power management, and connectivity to deliver an unparalleled viewing experience. Built with a robust **multi-layer PCB (Printed Circuit Board)** construction, it integrates high-speed signal processing components, including a **dedicated OLED driver IC array**, which meticulously controls the micro-OLED pixels to achieve stunning contrast, deep blacks, and vibrant colors with unmatched precision. The board also features an **embedded power management unit (PMU)** that regulates voltage and current distribution efficiently, minimizing heat generation while maximizing energy efficiency critical for maintaining the longevity of both the board and the TV s delicate OLED panel.

At its core, the **MGJ673707** incorporates **LG s proprietary display control algorithms**, ensuring flawless synchronization between the TV s processing unit and the NanoCell or OLED display layers. This board is equipped with **HDMI 2.1 ports**, supporting **8K/4K HDR10 and Dolby Vision** for next-generation content, along with **eARC (Enhanced Audio Return Channel)** for immersive audio experiences via compatible soundbars and AV receivers. The inclusion of **Wi-Fi 6 and Bluetooth 5.0** modules enables seamless wireless connectivity, allowing users to stream high-definition content, update firmware over-the-air, and integrate smart home ecosystems effortlessly. For those seeking a premium audio experience, the board supports **LG s Signature Sound ** technology, enhancing dialogue clarity and spatial audio through advanced processing.

Designed with **modular flexibility**, the **MGJ673707** is engineered to replace faulty or degraded mainboards in LG s **UQ90 Series** and **EAX690835** models without compromising performance. Its **high-reliability soldering and component placement** ensure durability, reducing the risk of short circuits or signal interference that can plague aftermarket replacements. Whether restoring a TV to factory-like performance after a hardware failure or upgrading an existing unit, this board delivers the **same level of precision and reliability** as LG s original components. Ideal for technicians, DIY enthusiasts, and repair professionals, the **MGJ673707** is a **direct-fit, high-quality replacement** that restores full functionality to your LG Nano OLED or EAX series TV, ensuring years of crisp, immersive entertainment with minimal maintenance.

### **Pros and Cons of buying a LG MJG673707 Board for Nano75/Nano80 UQ90 TVs (Model Numbers: EAX69083501, EAX69083503)**

1. **Compatibility and Functionality** The MJG673707 board is designed specifically for LG s Nano75 and Nano80 UQ90 series TVs (EAX69083501, EAX69083503). It ensures full compatibility with the TV s original features, including:

- NanoCell technology (for enhanced color accuracy and contrast).

- Alpha 9 Gen6 processor (for improved image processing).

- WebOS 6.5 (for smart TV functionality).

- HDMI 2.1 support (for 4K/120Hz gaming and high-bitrate content).

2. **Repair Cost Savings** If the original board fails, replacing it with a genuine or high-quality aftermarket unit can be significantly cheaper than buying a new TV. This is especially useful for older models where replacement parts may be harder to find.

3. **Extended TV Lifespan** A functional board ensures the TV remains operational, delaying the need for a full replacement. This is particularly beneficial for users who have invested in a high-end TV and want to preserve its performance.

- Dolby Vision and Atmos support.

- AI Picture Pro and other LG-specific enhancements.

- Full smart TV functionality (Netflix, YouTube, LG Content Store, etc.).

5. **Warranty and Reliability** If purchased from a reputable seller (e.g., authorized LG repair centers or trusted electronics retailers), the board may come with a warranty, reducing long-term repair risks.

6. **Better Than DIY or Cheap Alternatives** Attempting to repair with low-quality or salvaged parts can lead to further damage. The MJG673707 is a known-good replacement, reducing the risk of short circuits or compatibility issues.

---

1. **Cost** While cheaper than a new TV, the MJG673707 board is not extremely affordable. Prices typically range between **$200 $400**, depending on the seller and condition. This may still be a significant expense for some users.

2. **Labor Costs** Even if the board is replaced, professional installation (or careful DIY) may require additional fees, especially if the TV s back panel needs removal or soldering is involved.

3. **Risk of Counterfeit or Low-Quality Units** Buying from untrusted sellers increases the chance of receiving a fake or damaged board. This can lead to:

- No functionality (board fails immediately).

- Partial features (e.g., no HDMI 2.1, no Dolby Vision).

- Short lifespan (cheap components fail quickly).

4. **Limited Availability** Since these are older models (Nano75/Nano80 UQ90), finding a genuine replacement board may require searching online marketplaces (e.g., eBay, Facebook Marketplace, specialized repair forums). Stock can be inconsistent.

5. **Potential for Additional Damage** If the TV has other failing components (e.g., power supply, capacitors, or backlight), replacing just the board may not fully resolve issues. A full diagnostic may be needed.

6. **Voided Warranty (If Applicable)** If the TV was under warranty, opening it for a board replacement may void coverage, depending on the manufacturer s policies.

---

The **LG MJG673707 board is a viable and often cost-effective solution** for repairing Nano75/Nano80 UQ90 TVs (EAX69083501, EAX69083503) with a failed motherboard. It restores full functionality, including premium features like NanoCell, HDMI 2.1, and WebOS, making it a better alternative to buying a new TV or using cheap aftermarket parts.

- **Budget:** If the repair cost is within reasonable limits (e.g., $200 $400 for the board labor), it s a smart investment.

- **Reliability of the Seller:** Only purchase from trusted sources to avoid counterfeit or damaged units.

- **TV s Overall Health:** Ensure no other major components (power supply, backlight, etc.) are failing, as these could require additional repairs.

- **DIY vs. Professional Repair:** If comfortable with electronics, DIY installation is possible, but professional help may be safer for complex TVs.

For users who prioritize **long-term value and full functionality**, the MJG673707 board is a strong recommendation. For those on a tight budget or dealing with a TV in poor condition, weighing the repair cost against the TV s age and remaining useful life is essential.

---

- Matching model number (MJG673707).

- Seller reviews and return policies.

- Physical inspection (look for LG branding, proper connectors, and no signs of damage).

2. **Compare Prices** Look for deals on platforms like eBay, Amazon, or specialized repair forums (e.g., TVServiceGuru, Reddit s r/tvrepair). Avoid unusually cheap offers, as they may indicate counterfeit parts.

3. **Consider Professional Installation** If unsure about handling the repair, consult an LG-authorized service center or a trusted TV repair technician to avoid voiding warranties or causing further damage.

4. **Evaluate the TV s Age and Condition** If the TV is several years old and other components (e.g., backlight, power supply) are degraded, the repair may not be worth it. In such cases, upgrading to a newer model might be more cost-effective in the long run.

5. **Backup Data** Before opening the TV, back up any data stored on the internal hard drive (if applicable) via the TV s settings or an external drive.

**Final Verdict:** If the TV is otherwise healthy and the repair cost is justified, the **LG MJG673707 board is the best choice** for restoring full functionality. Proceed with caution when purchasing and consider professional help if needed.

Details:

LG Main Board for NANO75 NANO80 UQ90 TV MGJ673707 EAX69083501 EAX69083503.

part #: mgj673707 prices

• $14.50-$56.35

specifications tvboardgo:

• brand: Lg
• mpn: Mgj673707
• compatible brand: For Lg
• type: Main Board
• compatible model: Nano75, Nano80, Uq90

seller tvboardgo:

• city: Rochester, New York
• rating: 100.0%
• # reviews: 6

general tvboardgo:

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

returns tvboardgo:

• policy: No Returns

payments tvboardgo:

• credit card: Diners-club
• wallet: Google-pay
• other

offer tvboardgo:

• sold: 0
• options: Ship-to-home
• best offers: True
• quantity: 1
• availability: In Stock
• started: February 14, 2026

shipping tvboardgo:

• class: Standard
• carrier: USPS
• type: Calculated
• cost: $8.46
• transit: 5-10 Days
• service: USPS Ground Advantage

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