LG 34WN780 User Manual

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* LG LED Monitor applies LCD screen with LED backlights.

Please read this manual carefully before operating your set and

retain it for future reference.

34WN780

34BN780

OWNER’S MANUAL

LED LCD MONITOR

(LED Monitor*)

www.lg.com

Copyright © 2019 LG Electronics Inc. All Rights Reserved.

Questions and Answers:

M
Matthew BurgessJul 28, 2025
How to fix LG 34WN780 Monitor when nothing is displayed on the screen?
- D
  diazrickyJul 28, 2025
  If nothing is displayed on your LG Monitor screen, ensure the power cord is correctly plugged into the outlet. Also, verify the power cable connection and press the power button. Check that the connected input is enabled in the settings, and ensure the signal cable between your PC and the monitor is properly connected. If the issue persists, the signals from your PC might be outside the monitor's frequency range; refer to the product specifications to set the appropriate frequency.
D
David WoodAug 2, 2025
What to do if there is no sound from the headphone port on my LG 34WN780?
- J
  Joy GreenAug 2, 2025
  If you are not getting any sound from the headphone port on your LG Monitor, first ensure that the headphone port connections are properly made. Then, try increasing the volume using the joystick. Finally, set the audio output of your PC to the monitor you are using; the settings may differ depending on your operating system.
M
Michele TaylorAug 7, 2025
Why is my LG 34WN780 Monitor screen shaky and unstable?
- M
  Matthew DiazAug 7, 2025
  If your LG Monitor's screen display is unstable or images leave shadow trails, and you're using HDMI 1080i 60/50 Hz (interlaced) resolution, try changing it to 1080p or the recommended resolution. Also, ensure your graphics card is set to the recommended resolution to avoid blurred text, a dimmed screen, or misalignment.
R
Rebecca PerryAug 12, 2025
How to enable disabled features on LG 34WN780 Monitor?
- T
  tgilesAug 12, 2025
  If some features are disabled on your LG Monitor, disable OSD Lock in the General settings.
J
Jennifer HollandAug 17, 2025
Why does my LG Monitor show 'Unrecognized monitor, Plug and Play (VESA DDC) monitor found' message?
- T
  Timothy HardyAug 17, 2025
  If you see an 'Unrecognized monitor, Plug and Play (VESA DDC) monitor found' message on your LG Monitor, be sure to install the display driver from the LG website: http://www.lg.com. Also, make sure to check if your graphics card supports the Plug and Play function.
J
Jimmy MooreAug 22, 2025
Why does image sticking occur even when my LG Monitor is turned off?
- A
  Alvin KnightAug 22, 2025
  If image sticking occurs on your LG Monitor even when it's turned off, it may be due to displaying a still image for a prolonged time, which can cause damage to the screen. To extend the monitor's lifetime, use a screensaver.

LG 34WN780 Specifications

General

Screen Size	34 inches
Panel Type	IPS
Aspect Ratio	21:9
Refresh Rate	60Hz
Response Time	5ms (GtG)
Brightness	300 cd/m²
Contrast Ratio	1000:1
Color Support	sRGB 99%
VESA Mount	100 x 100 mm
HDR	HDR10
Resolution	3440 x 1440
Ports	2 x HDMI, 1 x DisplayPort, 2 x USB 3.0
Viewing Angle	178º/178°

Summary

Assembling and Preparing

Supported Drivers and Software

Information on downloading and installing drivers and software for the monitor.

Product and Button Description

How to Use the Joystick Button

Guide on operating the monitor functions using the joystick button.

Moving and Lifting the Monitor

Instructions for safe transportation and movement of the monitor.

Installing on a Table

How to Fix a Clamp

Adjusting the Swivel Stand

Leveling the Screen

Adjusting the Stand Height

Adjusting the Screen Angle

Using the Kensington Lock

Installing the Wall Mount Plate

Installing on the Wall

Guidelines for securely mounting the monitor on a wall.

Using the Monitor

Connecting to a PC

How to connect the monitor to a computer via HDMI or DisplayPort.

DisplayPort Connection

Details on connecting the monitor using a DisplayPort.

Connecting AV Devices

Connecting Peripherals

User Settings

Activating the Main Menu

Steps to access and navigate the monitor's on-screen display (OSD) menu.

Main Menu Features

Menu Settings

Quick Settings

Input Settings

Picture Settings

Picture Adjustments

Game Adjust Settings

Color Adjustments

Picture Reset

Sound Settings

General Settings

SMART ENERGY SAVING

Features for conserving energy by adjusting screen brightness and power modes.

Power LED Indicator

Information about the monitor's power LED indicator status.

Buzzer Settings

OSD Lock

Information Display

Reset to Initial Settings

Troubleshooting

Nothing is displayed on the screen

Steps to resolve issues when the screen shows no display.

Screen display is unstable and shaky

Solutions for screen instability, shaking, or image ghosting.

Unrecognized Monitor Message

No Sound from Headphone Port

Product Specifications

34WN780 Specifications

Technical specifications for the 34WN780 model.

34BN780 Specifications

Technical specifications for the 34BN780 model.

Factory Support Mode

HDMI Timing (Video)

Power LED Indicator

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