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LG UltraFine 5K - User Manual

LG UltraFine 5K
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www.lg.com
Please read this manual carefully before operating your set and retain it for future
reference.
OWNER’S MANUAL
27MD5KA
LG UltraFine 5K
Monitor
(For Mac)

Questions and Answers

  • G
    gibbsrichardJul 27, 2025
    What to do if nothing is displayed on my LG Monitor screen?
    • K
      kristinrandolphJul 27, 2025
      If nothing is displayed on your LG Monitor, ensure the monitor is connected to your Mac and that the PC is operating correctly, as the monitor should turn on automatically. Also, verify that the power cord is properly plugged into the power outlet.
  • S
    Stacy MartinezAug 2, 2025
    Why is my LG UltraFine 5K screen shaky and unstable, and how to fix it?
    • U
      udavisAug 2, 2025
      If your LG Monitor's screen display is unstable, shaky, or images leave shadow trails, try setting your monitor to the recommended (optimal) resolution. You may also need to update your Mac OS or driver to the latest version.
  • C
    Candace LopezAug 8, 2025
    Why can't I adjust the brightness on my LG UltraFine 5K?
    • R
      Robert GomezAug 8, 2025
      If you cannot adjust the brightness on your LG Monitor, it may be because some Mac OS versions do not support the display ALS (Ambient Light Sensor). You can manually adjust the monitor brightness by controlling the menu or hot key of a host.
  • C
    charleshenryAug 14, 2025
    How to fix abnormal display color on my LG UltraFine 5K Monitor?
    • J
      Joshua AbbottAug 14, 2025
      If the display color on your LG Monitor is abnormal, check if the signal cable is connected properly. Try reconnecting the cable or reinserting the PC's graphics card.
  • K
    Kenneth GillAug 20, 2025
    How to prevent image retention on my LG Monitor?
    • A
      Angela WrightAug 20, 2025
      Displaying a still image for a prolonged time may cause damage to the screen, resulting in the retention of the image. To extend the lifetime of your LG monitor, use a screensaver.

Summary

Important Precautions

AC Adapter and Electrical Power Precautions

Safety guidelines for using the AC adapter and electrical power connection.

Product Installation Precautions

Safety measures and environmental considerations for product installation.

Product Moving Precautions

Safe handling and transportation instructions to prevent damage or injury.

Product Usage and Cleaning Precautions

Guidelines for safe operation, maintenance, and cleaning of the monitor.

License

Assembling and Preparing

Monitor Supported Software

Information on software compatible with the monitor for enhanced features.

Monitor Product Description

Overview of the monitor's front and back components and features.

Monitor Input Connectors

Details and illustration of the monitor's input ports for connectivity.

Monitor ID and Sub ID Labels

Location and purpose of the monitor's identification labels.

Safely Moving and Lifting the Monitor

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

Installing the Monitor on a Table

Step-by-step guide for setting up the monitor on a table surface.

Adjusting Monitor Stand Height

Instructions on how to adjust the monitor's display height.

Adjusting Monitor Screen Angle

Guide for tilting the monitor screen for optimal viewing angles.

Using the Kensington Security Lock

Instructions for securing the monitor using a Kensington lock.

Detaching the Monitor Stand

Procedure for safely removing the monitor stand.

Attaching the VESA Design Cover

Steps for installing the VESA mounting cover.

Installing the Wall Mount Bracket

Guide for attaching a wall mount bracket to the monitor.

Making Connections

Connecting to a Host Device

How to connect the monitor to a computer or host device.

Connecting USB Devices

Instructions for connecting USB devices to the monitor's expansion ports.

Troubleshooting

No Display on Screen

Steps to resolve issues when the monitor screen is blank.

Screen Image Retention

Solutions for image sticking or retention when the monitor is off.

Unstable Display or Shadow Trails

How to fix screen instability or ghosting effects.

Abnormal Display Color

Troubleshooting steps for incorrect or monochrome display colors.

Brightness or ALS Issues

How to address problems with brightness control or the ambient light sensor.

Product Specification

Signal Timing

LG UltraFine 5K Specifications

General IconGeneral
Resolution5120 x 2880
Screen Size27 inches
Panel TypeIPS
Brightness500 cd/m²
Built-in CameraYes
SpeakersYes
Refresh Rate60 Hz
Viewing Angle178° (H) / 178° (V)
VESA MountYes (100 x 100 mm)
Color GamutP3
Ports1 x Thunderbolt 3, 3 x USB-C
Response Time14 ms
Stand AdjustmentsTilt
Weight18.7 lbs
Built-in FeaturesAmbient light sensor
Dimensions24.6 x 18.3 x 9.4 inches (with stand)

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