LG 27UD58-B 27-inch 4K UHD IPS Monitor User Manual

The LG 27UD58-B is a 27-inch 4K UHD IPS monitor with 3840 x 2160 resolution, AMD FreeSync technology, 5ms response time, 178°/178° viewing angles, HDMI and DisplayPort inputs, OnScreen Control software, Black Stabilizer, Flicker Safe technology, Reader Mode, and Game Mode. Features include split screen functionality, color calibration options, and energy-saving technologies. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Display Modes 8. OnScreen Control 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 27-inch 4K UHD IPS panel, On-Screen Display controls, HDMI and DisplayPort inputs, tilt-adjustable stand, AMD FreeSync technology.

Feature	Description
Screen Size	27-inch 4K UHD (3840 x 2160)
Panel Type	IPS with 178°/178° viewing angles
Response Time	5ms (GTG)
AMD FreeSync	Reduces screen tearing and stuttering
Inputs	HDMI, DisplayPort
Black Stabilizer	Enhances visibility in dark scenes
Flicker Safe	Reduces screen flickering
Reader Mode	Optimizes reading comfort
Game Mode	Enhances gaming experience
Split Screen	Multi-tasking with screen division

Installation

Unpack and inspect contents. Place on stable surface.

Attach stand: Align stand with monitor base and secure with provided screws.
Connect video sources: Use HDMI or DisplayPort cables for computer/gaming console connection.
Connect power: Plug power cord into monitor and wall outlet.
Turn on monitor: Press power button on bottom bezel.

WARNING! Monitor is heavy; lift with care to avoid injury. Ensure stand is securely attached.

First-Time Setup

Power on monitor; follow on-screen prompts.

Select input source: Press INPUT button to choose HDMI or DisplayPort.
Adjust display settings: Use OSD menu for brightness, contrast, and color settings.
Install OnScreen Control: Download software from LG website for enhanced control.
Calibrate colors: Use preset modes or custom calibration for optimal viewing.

CAUTION! Ensure stable surface; avoid placing in direct sunlight.

Specifications

Screen Size: 27 inches 4K UHD
Resolution: 3840 x 2160 pixels
Panel Type: IPS
Response Time: 5ms (GTG)
Refresh Rate: 60Hz
Viewing Angles: 178°/178°
Inputs: HDMI, DisplayPort
Features: AMD FreeSync, Black Stabilizer, Flicker Safe, Reader Mode
Power Consumption: Typical 30W, Max 45W
Dimensions: With stand: 24.2" x 18.3" x 8.7"

Controls and Settings

Access OSD via joystick control on bottom bezel. Power button: Turns monitor on/off.

OSD Menu: Brightness, Contrast, Sharpness, Color Temperature, Gamma, Input Select, Game Mode, Picture Mode, Screen Split, General Settings.

Picture Modes: Custom, Reader, Photo, Cinema, Game, Color Weakness. Game Mode: FPS, RTS, Custom. Color Settings: Color Temperature, Gamma, Six Color, Black Level. Input Settings: HDMI, DisplayPort selection.

Connecting Devices

HDMI: For computers, gaming consoles, media players. DisplayPort: For high-performance computing and gaming.

Turn off monitor and devices before connecting.
Match cables to ports (HDMI to HDMI, DisplayPort to DisplayPort).
Select input via INPUT button or OSD menu.
For multiple devices: Use different inputs and switch between them.

Tip: Use high-quality cables for optimal 4K performance.

Display Modes

Supports various preset modes for different content types.

Reader Mode: Reduces blue light for comfortable reading.
Game Mode: Optimizes settings for gaming with Black Stabilizer.
Cinema Mode: Enhances video content with richer colors.
Photo Mode: Accurate color reproduction for photo editing.
Custom Mode: User-defined settings for personal preference.
Split Screen: Picture-by-Picture or Picture-in-Picture modes.

WARNING! Avoid static images for extended periods to prevent image retention.

OnScreen Control

LG's software for enhanced monitor control via computer.

Screen Split: Easily divide screen into multiple sections
Color Calibration: Fine-tune color settings
Input Management: Switch between connected devices
Monitor Settings: Adjust all OSD settings from computer
Update Firmware: Keep monitor software up to date

Care & Cleaning

Unplug before cleaning. Use soft, dry cloth only; no liquids or aerosols.

CAUTION! Do not spray liquids directly on screen; use minimal pressure when cleaning.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © 2025 LG Electronics; trademarks of LG Electronics Inc. Energy Star certified. For support, visit www.lg.com or contact 1-800-243-0000.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power connection	Check power cord connection; ensure outlet is working.
No display	Input selection/cables	Select correct input; check cable connections; try different cable.
Poor image quality	Resolution settings	Set computer to 3840x2160 resolution; check cable quality.
Screen flickering	Refresh rate/cable	Set refresh rate to 60Hz; use high-quality cables.
Dead pixels	Manufacturing defect	Contact LG support for warranty service if within specifications.

Reset: OSD Menu > General > Reset All

Service: 1-800-243-0000; www.lg.com