The LG Ultra Fine 5K display device called 22MD5KA is a monitor product that can be connected to a Mac device for use.
You can connect it to a Mac host that supports Thunderbolt 3 or some of Mac hosts that support Thunderbolt 2 for use.
The following is the list of devices supported and depending on the Mac host, different resolutions are supported.
5120 x 2880@60Hz supported
iMac(2017)
MacBook Pro(2016) and subsequent models
3840 x 2160@60Hz supported
MacPro(Late 2013)
MacBook Pro(Mid 2014) and subsequent models
iMac(27 inch, Late 2014) and subsequent models
iMac(21.5 inch, Late2015)
MacBook Air(Early 2015)
3200 x 1800@60Hz supported
Mac mini(Late 2014)
Not compatible with MacBook. Connect your MacBook to a Ultra Fine 4k display for use.
Try this
Check the OS version.
You are recommended to use a Mac OS version subsequent to Sierra 10.12.3.
Check the cable used for a connection.
When connecting a Mac host that supports Thunderbolt 3, use the Thunderbolt 3 cable in the basic package to make a connection.
When connecting a Mac host that supports Thunderbolt 2, use the Thunderbolt 3 to Thunderbolt 2 adapter sold separately to make a connection.
If used by connecting to an adapter, the power delivery function is not available.
This guide was created for all models, so the images or content may be different from your product.