LG 27UL550P 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.

27UL550

27UL550P

27UL500

27UL500P

27UK500

27BL55U

OWNER’S MANUAL

LED LCD MONITOR

(LED Monitor*)

www.lg.com

Copyright © 2018 LG Electronics Inc. All Rights Reserved.

Questions and Answers:

J
Jose BradleyJul 29, 2025
Why is nothing displayed on my LG Monitor screen?
- A
  Ashley GonzalezJul 29, 2025
  There could be several reasons why nothing is displayed on your LG monitor's screen. First, ensure the power cord is correctly plugged into the power outlet and that the power cable connection is secure, then press the power button. Also, verify that the connected input is enabled in the monitor's settings under the Input section. This issue can also occur if the signal cable between your PC and the monitor is either missing or disconnected, so check the cable and reconnect it securely. Finally, the signals transferred from the PC (graphics card) might be out of the monitor's horizontal or vertical frequency range. Refer to the Product Specification section of the manual to set the appropriate frequency.
D
Dakota StevensAug 5, 2025
Why is there no sound from the headphone port on my LG 27UL550P?
- P
  Patricia CollierAug 5, 2025
  If there is no sound from the headphone port on your LG monitor, first ensure that the headphone port connections are made properly. If the connections are correct, try increasing the volume using the joystick. Also, make sure to set the audio output of the PC to the monitor you are using. Note that the settings may differ depending on the operating system you use.
N
Nancy HoltAug 10, 2025
What to do if my LG 27UL550P screen display is unstable and shaky?
- S
  stevensanchezAug 10, 2025
  If your LG monitor's screen display is unstable or shaky, or if images displayed on the monitor leave shadow trails, and the selected resolution is HDMI 1080i 60/50 Hz (interlaced), the screen may be flickering. Try changing the resolution to 1080p or the recommended resolution. Also, not setting the graphics card to the recommended (optimal) resolution may result in blurred text, a dimmed screen, a truncated display area or misalignment of the display.
R
Randy GonzalezAug 16, 2025
How to fix an 'Unrecognized monitor, Plug and Play (VESA DDC) monitor found' message on my LG monitor?
- A
  Ashley BakerAug 16, 2025
  If you see an "Unrecognized monitor, Plug and Play (VESA DDC) monitor found" message, be sure to install the display driver from the LG website. Also, make sure to check if the graphics card supports Plug and Play function.
D
Dr. Elizabeth BennettAug 22, 2025
How to enable disabled features on LG 27UL550P?
- B
  Brandi FergusonAug 22, 2025
  If some features are disabled on your LG monitor, the OSD might be locked. To enable the features, disable OSD Lock in the General settings.

LG 27UL550P Specifications

General

Color gamut	98 %
Pixel pitch	0.1554 x 0.1554 mm
Display diagonal	27 \
Anti-glare screen	Yes
Display technology	LED
Native aspect ratio	16:9
Maximum refresh rate	60 Hz
Display number of colors	1.07 billion colors
Display brightness (peak)	300 cd/m²
Display diagonal (metric)	68 cm
Supported graphics resolutions	3840 x 2160
High Dynamic Range (HDR) technology	High Dynamic Range 10 (HDR10)
Built-in USB hub	-
DisplayPort version	1.4
Energy efficiency scale	A to G
Power consumption (max)	41 W
Power consumption (off)	0.3 W
Power consumption (standby)	0.5 W
Power consumption (typical)	36 W
Panel mounting interface	100 x 100 mm
Package depth	192 mm
Package width	704 mm
Package height	518 mm
Package weight	8600 g
Product color	Silver
Market positioning	Gaming

Weight and Dimensions

Depth (with stand)	230 mm
Width (with stand)	622.6 mm
Height (with stand)	572.2 mm
Weight (with stand)	6000 g
Depth (without stand)	45.8 mm
Height (without stand)	371 mm
Weight (without stand)	4400 g

Summary

Assembling and Preparing

Product and Button Description

Joystick Button Operation

Moving and Lifting the Monitor

Instructions for safely moving and lifting the monitor to prevent damage.

Installing on a Table

Kensington Lock and Wall Mounting

Installing the Wall Mount Plate

Installing on the Wall

Using the Monitor

Connecting to a PC

How to connect the monitor to a personal computer using various interfaces.

HDMI Connection

DisplayPort Connection

User Settings

Activating the Main Menu

Steps to access and navigate the monitor's main menu using the joystick.

Joystick Button Functions

Details how joystick movements and presses control menu navigation and functions.

Main Menu Features

Main Menu Options

Overview of main menu features like Power Off, Input, Settings, and Picture Mode.

Menu Settings Navigation

Instructions on navigating the OSD menu and selecting options using the joystick.

Quick Settings

Adjustable Settings

Details on adjusting Brightness, Contrast, Volume, and Color Temperature.

Input Settings

Input and Aspect Ratio Settings

How to select input modes and adjust screen aspect ratios like Full Wide and Original.

Picture Settings

Picture Mode for SDR Signals

Explains various Picture Mode presets for SDR signals like Custom, Vivid, Cinema, FPS.

Picture Mode for HDR Signals

Details Picture Mode presets for HDR signals like Custom, Vivid, Standard, Cinema, FPS, RTS.

Picture Adjustments

How to adjust Brightness, Contrast, Sharpness, SUPER RESOLUTION+, Black Level, and DFC.

Game Adjustments

Color Adjustments

Options for Gamma, Color Temperature, RGB, Six Color adjustments, and resetting picture settings.

General Settings

HDMI ULTRA HD Deep Color

Troubleshooting

No Display Issues

Common issues and solutions when the screen shows no display.

Display Instability and Ghosting

Troubleshooting steps for unstable display or image ghosting issues.

Feature Availability Issues

Unrecognized Monitor Message

Product Specification (27UL500, 27UL500P)

Product Specification (27UK500)

Product Specification (27UL550, 27UL550P)

Product Specification (27BL55U)

Color Depth and Resolution

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