1. Introduction
This manual provides comprehensive instructions for the assembly, operation, maintenance, and care of your ONBRILL 110" U-Shaped Modular Sectional Sofa. Please read this manual thoroughly before assembly and use to ensure proper function and longevity of your product.
The ONBRILL modular sectional sofa is designed for versatility, featuring a convertible design, adjustable backrests, integrated storage, and convenient charging ports and cup holders.
2. Safety Information
- Keep away from excessive moisture or heat.
- Supervise children and pets when using the convertible features to avoid entrapment risks.
- Ensure all components are securely fastened before use.
- Do not exceed the weight capacity of 300 lbs per seat.
3. Package Contents
Your ONBRILL modular sectional sofa is shipped in three separate boxes. These boxes may arrive on different dates. Please ensure all packages have been received before beginning assembly.
Verify that all components listed below are present. If any parts are missing or damaged, please contact customer support.
- Modular seat sections (various configurations)
- Backrests
- Armrests (with integrated charging ports and cup holders)
- Legs
- Throw Pillows
- Assembly Tools (all required tools are included)
- Hardware pack (bolts, washers, etc.)
4. Assembly Instructions
Assembly of the ONBRILL modular sectional sofa is designed to be straightforward. All necessary tools are included. It is recommended to assemble the sofa with at least two people.
Step-by-Step Assembly:
- Unpack Components: Carefully remove all parts from the packaging. Lay them out on a clean, soft surface to prevent scratches.
- Attach Legs: For each modular seat and chaise section, securely attach the furniture legs to the designated points on the underside. Ensure they are tightened firmly.
- Connect Modular Sections: Arrange the modular sections in your desired configuration (U-shaped, L-shaped, etc.). Use the provided component connectors to link the sections together. Ensure each connection is secure to prevent movement.
- Install Backrests: Slide or clip the backrests into their respective slots on the seat sections. Confirm they are locked into place.
- Attach Armrests: Secure the armrests to the end modular sections. Connect any integrated wiring for charging ports if applicable.
- Final Check: Once assembled, gently push and pull on each section to ensure all connections are stable and secure.

Figure 4.1: Product dimensions for assembly planning. The sofa measures 110 inches wide, 55 inches deep, and 34 inches high.

Figure 4.2: The modular design allows for multiple transformation forms, including U-shape, L-shape, and a flat sleeper bed.
5. Operating Instructions
5.1 Convertible Modular Design
Each piece of the ONBRILL modular sectional sofa is removable, allowing for flexible rearrangement. You can reconfigure the sofa into various layouts such as an L-shaped sofa, a U-shaped sofa, or a sofa bed, depending on your space and needs. To reconfigure, simply disconnect the modular sections and rearrange them as desired, then reconnect using the provided connectors.
5.2 Adjustable Backrest
All backrests on this sofa are adjustable. To adjust a backrest, gently push or pull it to your desired angle. When fully flattened, the sofa easily transforms into a sleeper bed, providing a convenient sleeping surface for guests. Ensure the backrest is securely locked in position after adjustment.

Figure 5.1: The unique adjustable backrest design allows for conversion to a sleeper bed.

Figure 5.2: The sofa easily converts into a sleeper bed for overnight guests.
5.3 Storage Seats
Each seat of this sectional sofa includes a hidden storage space underneath. To access the storage, lift the seat cushion. This space is ideal for storing items such as seasonal blankets, extra throw pillows, or other household items, helping to keep your living area tidy.

Figure 5.3: Built-in storage space is located under each seat for convenient organization.
5.4 Charging Ports & Cup Holders
The armrest features a built-in charging outlet, allowing you to conveniently power your electronic devices. Additionally, a cup holder is integrated into the armrest, providing a secure spot for beverages.

Figure 5.4: Detail of the dual charging ports and cup holder on the armrest.
6. Maintenance and Care
6.1 Cleaning the Chenille Fabric
The sofa is upholstered in high-quality chenille fabric. For general cleaning, wipe with a damp cloth. Avoid using harsh chemicals or abrasive cleaners, as these may damage the fabric. For spills, blot immediately with a clean, dry cloth. For stubborn stains, consult a professional upholstery cleaner.
6.2 General Care
- Periodically check and tighten all bolts and connectors to ensure stability.
- Avoid placing the sofa in direct sunlight for prolonged periods to prevent fading.
- Keep sharp objects away from the fabric to prevent tears or snags.
7. Troubleshooting
If you encounter any issues with your ONBRILL sectional sofa, please refer to the following common solutions:
- Sofa feels unstable: Check all leg attachments and modular connectors. Tighten any loose components. Ensure the sofa is on a flat, even surface.
- Backrest not adjusting smoothly: Ensure no obstructions are present behind or around the backrest mechanism. Apply gentle, even pressure when adjusting.
- Charging ports not working: Verify that the power cable for the charging ports is properly connected to a working power outlet and to the sofa's internal connection point (usually located near the armrest base).
- Missing parts or damaged components: If you received your product with missing parts or damaged components, please contact ONBRILL customer support immediately for assistance.
For further assistance, please contact ONBRILL customer support.
8. Specifications
| Feature | Detail |
|---|---|
| Brand | ONBRILL |
| Model | 110" U-Shaped Modular Sectional Sofa |
| Product Dimensions (D x W x H) | 55"D x 110"W x 34"H |
| Item Weight | 80 Pounds |
| Seating Capacity | 6 |
| Weight Capacity (per seat) | 300 LBS |
| Upholstery Fabric Type | Chenille |
| Upholstery Color | Beige |
| Frame Material Type | Engineered Wood |
| Seat Fill Material | Foam |
| Special Features | Adjustable Backrest, Storage, Charging Ports, Cup Holders |
| Assembly Required | Yes (Installation Required) |
| Includes All Assembly Tools | Yes |
| Item Firmness Description | Medium |
| Indoor Outdoor Usage | Indoor |
9. Warranty and Support
9.1 Warranty Information
This ONBRILL product comes with a Limited Warranty. Please refer to the warranty documentation included with your purchase for specific terms and conditions. The warranty typically covers manufacturing defects under normal use.
9.2 Customer Support
For any questions, concerns, or assistance with your ONBRILL 110" U-Shaped Modular Sectional Sofa, please contact ONBRILL customer support. We aim to respond to inquiries within 24 hours and provide solutions.
You can typically find contact information on the ONBRILL brand store page or through your purchase platform.