1. Introduction
This manual provides essential information for setting up, operating, and maintaining your LG 27US550-W 27-inch 4K UHD UltraFine IPS Monitor. Please read this manual thoroughly before using the product to ensure proper and safe operation. Keep this manual for future reference.

Figure 1: Front view of the LG 27US550-W monitor.
2. What's in the Box
Verify that all components are present in the package:
- LG 27-inch 4K UHD UltraFine IPS Monitor (Model: 27US550-W)
- Monitor Stand and Base
- Power Cable
- 1.5m HDMI Cable
- User Manual / Quick Start Guide
- VESA Screws (for optional wall mounting)
- 2x Deco Gear 6FT Universal 4K HDMI 2.0 Cable with 28AWG Pure Copper Conductors
- Tech Smart USA Elite Suite 18 Standard Editing Software Bundle

Figure 2: Contents of the LG 27US550-W monitor package.
3. Setup
3.1. Monitor Assembly
The monitor stand and base are designed for tool-free assembly. Simply attach the stand to the base, then secure the assembled stand to the back of the monitor until it clicks into place.

Figure 3: Assembled LG 27US550-W monitor on its stand.
3.2. Video Connections
Connect your computer or other devices to the monitor using the appropriate cables. The LG 27US550-W features multiple input options:
- HDMI 2.0: For high-definition video and audio. Two HDMI ports are available.
- DisplayPort 1.4: For high-resolution video and audio.
- USB-A 2.0: For connecting peripheral devices.
- Audio Out: For connecting external speakers or headphones.
Video 1: This video demonstrates the general steps for connecting video and power cables to a monitor. Note that the specific monitor model shown in the video may differ from your LG 27US550-W, but the connection principles are similar.
3.3. Power Connection
Connect the power cord to the monitor's DC-IN port and then plug the other end into a power outlet.
4. Operating the Monitor
4.1. Power On/Off
Press the power button, usually located on the bottom or back of the monitor, to turn it on or off.
4.2. Display Features
- 4K UHD (3840x2160) IPS Display: Experience stunning visual clarity and vibrant colors with a sharp resolution.
- HDR10 & DCI-P3 90% (Typ.): Enjoy brilliant, cinematic visuals with enhanced brightness up to 300 nits and accurate color reproduction for realistic depth and detail.
- 3-side Virtually Borderless Design: Maximizes screen space and minimizes distractions, ideal for multi-monitor setups.
4.3. Ergonomic Adjustments
Customize your viewing experience for optimal comfort and productivity:
- Tilt: Adjust the screen angle forward or backward.
- Height: Raise or lower the monitor to eye level.
- Swivel: Rotate the screen horizontally.
- Pivot: Rotate the screen vertically for portrait mode.

Figure 4: LG 27US550-W monitor adjusted to portrait orientation.
4.4. LG Switch App
Utilize the LG Switch app to optimize your workflow. This application allows you to:
- Divide the display into up to 6 sections for efficient multitasking.
- Change theme designs.
- Launch video call platforms with mapped hotkeys.
5. Maintenance
To ensure the longevity and optimal performance of your monitor, follow these maintenance guidelines:
- Cleaning: Gently wipe the screen with a soft, lint-free cloth. For stubborn marks, use a screen-cleaning solution specifically designed for monitors. Avoid harsh chemicals or abrasive materials.
- Ventilation: Ensure the monitor's ventilation openings are not blocked to prevent overheating.
- Storage: When not in use for extended periods, store the monitor in a cool, dry place away from direct sunlight and extreme temperatures.
6. Troubleshooting
If you encounter issues with your monitor, refer to the following common troubleshooting steps:
- No Power: Check if the power cable is securely connected to both the monitor and the power outlet. Ensure the power outlet is functional.
- No Signal: Verify that the video cable (HDMI, DisplayPort) is correctly connected to both the monitor and your computer. Ensure the correct input source is selected on the monitor.
- Flickering Screen: Check the video cable for damage or loose connections. Try adjusting the refresh rate in your computer's display settings.
- Incorrect Colors: Reset the monitor to factory settings via the On-Screen Display (OSD) menu. Ensure your computer's graphics drivers are up to date.
- Sound Issues: If using the monitor's audio output, ensure external speakers/headphones are properly connected and selected as the output device on your computer.
For further assistance, consult the full user manual or contact LG customer support.
7. Specifications
| Feature | Specification |
|---|---|
| Model Number | 27US550-W |
| Screen Size | 27 Inches |
| Resolution | 3840 x 2160 Pixels (4K UHD 2160p) |
| Aspect Ratio | 16:9 |
| Panel Type | IPS |
| HDR Support | HDR10 |
| Color Gamut | DCI-P3 90% (Typical) |
| Image Brightness | 300 nits |
| Screen Surface | Matte |
| Product Dimensions | 24.15 x 9.97 x 21.23 inches |
| Item Weight | 7.3 pounds |
| Manufacturer | LG |
8. Warranty and Support
Your LG 27US550-W monitor comes with a LG 1 Year Limited Protection. Additionally, this bundle includes a Deco Gear CPS Exclusive 26 Months Premium Extended Service Protection Plan, which covers accidental damage and burn-in.
For warranty claims or technical support, please refer to the contact information provided in your product documentation or visit the official LG support website.