SONY Tuner Board Main/t XBR-49X850B A-2057-841-A/A-1989-740B

( Brand: Sony ), ( Manufacturer Part Number: A-2057-841-A ), ( Compatible Brand: For Sony ), ( Type: Main/t-con Tuner Board ), ( Compatible Model: Xbr-49x850b )

Review SONY Oem Main/t-con Tuner Board Model Part A-2057-841-a/a-1989-740b

The **Sony A-2057-841-A Main/T-CON Tuner Board** is a critical high-performance component designed exclusively for the **XBR-49X850B** (and compatible with the **A-1989-740B** model) ultra-high-definition 4K OLED television series, ensuring seamless integration with Sony s advanced display and processing technologies. This board serves as the central hub for signal processing, tuner functionality, and T-CON (Timing Control) operations, which are essential for delivering pristine video and audio performance. Engineered with Sony s proprietary **4K HDR processing**, this tuner board supports a wide range of broadcasting standards, including **ATSC 3.0, DVB-T2, ISDB-Tb, and analog signals**, making it versatile for global markets. Its **841-A variant** incorporates optimized circuitry for enhanced signal clarity, reduced noise, and improved dynamic contrast, which is particularly beneficial for the X850B s **OLED panel**, ensuring vibrant colors, deep blacks, and precise motion handling. The board features a **high-speed T-CON interface** that synchronizes the incoming video signals with the display s pixel array, minimizing lag and maintaining the integrity of 4K resolution, HDR10, and Dolby Vision content. Additionally, it integrates **Sony s advanced noise reduction algorithms**, which help eliminate artifacts and enhance overall picture quality, even in low-light or high-contrast scenes. For audio, the tuner board supports **Dolby Atmos, DTS:X, and multi-channel formats**, ensuring immersive sound experiences that complement the television s premium visuals. Built with **high-grade components and robust soldering techniques**, this board is designed for durability, making it a reliable upgrade or replacement for users seeking to restore or enhance their X850B s performance. Whether replacing a faulty unit or upgrading for better signal processing, the **A-2057-841-A** is a precision-engineered solution that upholds Sony s commitment to cutting-edge television technology.

### **Pros and Cons of buying a Sony A-2057-841-A Main/T-CON Tuner Board for the XBR-49X850B (and Compatibility with A-1989-740B)**

1. **Direct Compatibility with XBR-49X850B** The A-2057-841-A is the official main/T-CON tuner board for the Sony XBR-49X850B (Bravia 4K X850B). This means it is designed specifically for this model, ensuring proper signal processing, display functionality, and compatibility with the TV s internal components.

2. **High-Quality 4K Processing** The X850B is a 4K HDR TV, and the A-2057-841-A board is responsible for handling 4K upscaling, HDR processing, and color management. A functioning board ensures optimal picture quality, including sharpness, contrast, and color accuracy.

- **No signal/black screen** (due to failed T-CON or tuner board).

- **Color distortion or banding** (indicating a failing board).

- **Input lag or processing delays** (a symptom of a degraded board).

Replacing the board can resolve these problems if they are board-related rather than cable or connector issues.

4. **Aftermarket Availability** This board is widely available from Sony-authorized repair centers, eBay, and third-party sellers (such as eBay, Amazon, or specialized TV repair shops). Prices typically range from **$150 $300**, depending on condition and seller reputation.

5. **Long-Term Reliability** Unlike cheaper aftermarket boards, the genuine Sony part is built to last, reducing the risk of early failure. It also maintains warranty coverage if purchased from an authorized source.

6. **Compatibility with A-1989-740B (XBR-49X900B/XBR-55X900B)** While not identical, the **A-1989-740B** (used in the X900B series) shares some similarities in architecture. However, **direct swapping is not recommended** because:

- The **X850B (A-2057-841-A) uses a different firmware and processing chipset** than the X900B (A-1989-740B).

- **Physical pinouts and connectors may differ**, risking damage if not properly matched.

- **Software compatibility** (menu system, HDMI-CEC, etc.) could be affected.

- **Warranty voiding** if the TV was under warranty (Sony may reject repairs if non-matching parts are used).

*However, if absolutely necessary (e.g., no A-2057-841-A available), a skilled technician could attempt a **pin-compatible swap with firmware adjustments**, but this is risky and not guaranteed to work.*

7. **Easier DIY Replacement** The board is **soldered in** (not plug-and-play like some other components), but it is **not extremely difficult to replace** for someone with basic electronics skills. Tools required:

- Soldering iron (30W )

- Desoldering braid/wick

- Multimeter (for testing connections)

- Replacement board

- Patience (takes 1 2 hours for a first-time DIYer)

8. **Prevents Further Damage** A failing board can cause **power supply issues, overheating, or even damage to the mainboard** if left unchecked. Replacing it early can save money on more extensive repairs.

---

1. **High Cost Relative to TV Value** The XBR-49X850B is an older 4K TV (released 2016 2017), and its resale value is **low ($100 $200 used)**. Replacing the board for **$150 $300** may not be cost-effective if the TV has other failing components (e.g., backlight, power supply).

- Fail prematurely.

- Lack proper testing.

- May not include necessary firmware updates.

- Could void warranty claims.

*Always buy from reputable sellers with return policies.*

- **No power** (if solder bridges the power rail).

- **Partial functionality** (if connections are loose).

- **Permanent damage** to the TV s mainboard.

*If unsure, hire a professional ( $100 $200 labor).*

- **Backlight failure** (common in older Sony 4K TVs).

- **Power supply or fuse issues** (can cause intermittent power).

- **Corrupted firmware** (may require a full reset or professional flash).

- **Physical damage** (cracks, water damage, or bent connectors).

5. **Warranty Voidance** If the TV was **never under warranty** or the warranty expired, this is not an issue. However, if it was **still under warranty**, Sony may **deny coverage** for a board replacement, especially if the original cause was user-induced (e.g., power surges, physical damage).

6. **Limited Lifespan of the TV Itself** The X850B is **notoriously prone to backlight failure** (especially the **CCFL backlight**, which degrades over time). If the TV is **5 years old**, the board replacement may just be a temporary fix before the TV becomes unusable due to other failures.

7. **No Major Software Updates** The X850B runs **Xoreax firmware**, which is outdated by modern standards. Even with a new board, you won t get **AI processing, advanced upscaling, or newer features** found in newer Sony TVs.

8. **Alternative Solutions May Be Cheaper**

- If the issue is **input lag or minor processing glitches**, a **firmware reset** or **recalibration** might help.

- If the problem is **signal-related**, checking **HDMI cables, inputs, or the source device** could be cheaper than a board swap.

- If the TV is **mostly dead but has a working board**, consider **donating it or selling parts** instead of full replacement.

---

### **Conclusion & Recommendation**

#### **Should You Buy the A-2057-841-A Board for Your XBR-49X850B?**

The TV has **clear symptoms of a failing board** (black screen, color distortion, no input detection).

You are **willing to invest in fixing the TV** rather than replacing it.

- Have **basic soldering skills** and are comfortable with a **DIY replacement**, or

- Are **hiring a professional** ( $150 $250 labor part).

The TV is **otherwise in good condition** (no backlight failure, power issues, or major physical damage).

You **cannot find a cheaper alternative** (e.g., a working used X850B for $200).

The TV has **other major failures** (backlight, power supply, screen damage).

You **cannot afford the repair** relative to the TV s value ( $150 $300 vs. $100 $200 resale).

You **lack technical confidence** in handling the replacement.

The issue is **not confirmed to be the board** (test with a known-good HDMI source first).

You **prefer newer tech** and are open to upgrading to a **used 4K TV with better features** (e.g., X90J, X95J, or even a budget 2020s model).

1. **Confirm the Problem is the Board**

- Test with **multiple HDMI sources** (gaming console, Blu-ray, streaming stick).

- Check for **physical damage** (bulging capacitors, burnt smells, loose connections).

- Look for **error codes** (e.g., "Input Error," "No Signal") that suggest a board issue.

2. **Consider Professional Repair First**

- Some repair shops offer **diagnostic services** ( $50 $100) to confirm if the board is faulty.

- If the issue is **not the board**, they may recommend a **cheaper fix** (e.g., replacing a fuse, cleaning contacts).

3. **Buy from a Trusted Source**

- **Authorized Sony repair centers** (most reliable, but may charge

Details:

Repeated messages from the same user may be blocked. Please review all pictures to take note of condition. They are tested and working.

part #: a2057841 prices

• $74.96-$189.00

specifications tvboardgo:

• brand: Sony
• mpn: A-2057-841-a
• compatible brand: For Sony
• type: Main/t-con Tuner Board
• compatible model: Xbr-49x850b

payments tvboardgo:

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

seller tvboardgo:

• city: Richardson, Texas
• # reviews: 915
• rating: 99.3%

offer tvboardgo:

• sold: 0
• quantity: 1
• availability: In Stock
• options: Ship-to-home
• started: April 29, 2026
• best offers: True

shipping tvboardgo:

• transit: 3-7 Days
• service: Standard
• cost: $19.75
• type: Fixed
• class: Standard

returns tvboardgo:

• policy: No Returns

general tvboardgo:

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

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