LG 34UM88C User Manual

The LG 34UM88C is a 34-inch UltraWide QHD IPS Monitor with 3440x1440 resolution, AMD FreeSync technology, sRGB 99% color gamut, OnScreen Control, Dual Controller, Reader Mode, Black Stabilizer, Game Mode, and multiple connectivity options including HDMI, DisplayPort, and USB hub. 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. Gaming Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 34-inch UltraWide IPS panel, OnScreen Control software, AMD FreeSync, multiple input ports, ergonomic stand with height/tilt adjustment.

Feature	Description
Screen Size	34-inch UltraWide QHD (3440x1440)
Panel Type	IPS with sRGB 99% color gamut
Refresh Rate	60Hz with AMD FreeSync
Response Time	5ms (GTG)
Connectivity	HDMI, DisplayPort, USB 3.0 Hub
Adjustability	Height, tilt, swivel adjustment
Special Features	OnScreen Control, Dual Controller, Reader Mode
Power Input	100-240V AC, 50/60Hz
Brightness	300 cd/m² typical
Contrast Ratio	1000:1 (static)

Installation

Unpack and inspect contents. Assemble monitor on stable surface.

Attach stand: Align stand base with monitor neck and secure with provided screw.
Connect power: Plug power cord into monitor and wall outlet.
Connect video source: Use HDMI or DisplayPort cable to connect to computer.
Connect USB devices: Use USB upstream cable for hub functionality.

WARNING! Monitor is heavy; lift with care to avoid injury. Ensure all connections are secure.

First-Time Setup

Power on monitor; follow on-screen prompts if available.

Adjust ergonomics: Set desired height, tilt, and swivel position.
Configure display settings: Use OSD menu to adjust brightness, contrast, and color.
Install OnScreen Control: Download software from LG website for enhanced control.
Set input source: Press INPUT button to select correct source (HDMI/DisplayPort).

CAUTION! Ensure stable surface; adjust ergonomic settings carefully.

Specifications

Screen Size: 34 inches UltraWide QHD.
Resolution: 3440 x 1440 pixels.
Aspect Ratio: 21:9.
Panel Technology: IPS with sRGB 99%.
Refresh Rate: 60Hz with AMD FreeSync.
Response Time: 5ms (Gray to Gray).
Connectivity: 2x HDMI, DisplayPort, 2x USB 3.0 downstream, USB upstream.
Adjustability: Height 110mm, Tilt -5°~15°, Swivel ±15°.
Power Consumption: Typical 45W, Max 70W, Standby <0.5W.
VESA Mount: 100x100mm compatible.

Controls and Settings

Access OSD via joystick control button on bottom bezel. Power button located on rear.

OSD Menu Navigation: Use joystick to navigate menus - push for select, move for navigation.

Picture: BRIGHTNESS, CONTRAST, SHARPNESS, GAMMA, COLOR TEMPERATURE. Game: GAME MODE, BLACK STABILIZER, RESPONSE TIME. Display: INPUT SELECT, SCREEN DIVISION, PBP. General: LANGUAGE, RESET, POWER LED.

Connecting Devices

HDMI: For computers, gaming consoles. DisplayPort: For high-resolution PC connection. USB: For peripheral devices.

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 USB hub: Connect upstream cable to computer.

Tip: Use DisplayPort for best performance at native resolution.

Display Modes

Supports multiple display modes for different usage scenarios.

Reader Mode: Reduces blue light for comfortable reading.
Game Mode: Optimizes settings for gaming performance.
Photo Mode: Enhances color accuracy for photo editing.
Cinema Mode: Optimizes for movie watching.
Custom Mode: User-defined settings for personal preference.
Screen Split: Enables PBP (Picture-by-Picture) for multiple inputs.

WARNING! Do not use extreme brightness settings for extended periods.

Gaming Features

AMD FreeSync: Synchronizes monitor refresh rate with GPU for smooth gameplay. Black Stabilizer: Enhances visibility in dark scenes. Response Time: Adjustable for gaming performance.

Care & Cleaning

Unplug before cleaning. Use soft, dry cloth for screen; slightly damp cloth for casing. Do not use chemicals or aerosols.

CAUTION! Do not spray liquids directly on screen; keep away from moisture and extreme temperatures.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © 2025 LG Electronics; all trademarks property of LG Electronics. Energy Star compliant. 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 source/cables	Select correct input source; check cable connections; try different cable.
Flickering display	Cable/refresh rate	Use high-quality cable; adjust refresh rate settings.
Color issues	Settings/cable	Reset color settings; check cable for damage.
USB devices not working	Upstream cable	Ensure USB upstream cable is connected to computer.

Reset: OSD Menu > General > Reset All.

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