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macrumors 68020
Dec 7, 2016
Seattle, WA
Did it not come with a usb-c cable? I know when I had an LG 4K UltraFine it only worked with the supplied cable.

I can’t give you an exact reason why though.

Edit: sounds dumb, but make sure you’re on the correct input. It might not auto-switch.


macrumors newbie
Jan 21, 2009
The USB-C Cable that comes with the macbook is technically just a "Charging Cable" its confusing I know. I got the LG Ultra fine and it included the USB-C video capable cable, does your monitor not have one?

If not just look for a USB-C video/charge cable. Do a google search to see which ones work and are worth buying.


macrumors 68020
Dec 7, 2016
Seattle, WA
Also keep in mind, according to the LG website this monitor doesn’t have enough power output to charge your MacBook Pro like the UltraFine displays do.


macrumors Penryn
Feb 20, 2009

What you need is a USB-c to displayport connector.
That's USB-c (at the Mac end) to displayport (at the display end).

IF your MacBook Pro is a 2017 model (as distinguished from a 2016 model):
You MUST be careful about WHICH USB-c to displayport adapter/cable you buy.

SOME USB-c to displayport cables work ok with with the 2016 MBP's but DO NOT WORK with the 2017 models.

You must CHECK VERY CAREFULLY to determine if this is mentioned as you shop for the connector. You want one that is specifically stated to be compatible with the 2017 MBP's.
Also -- check the user reviews (ALL of them), for experiences from owners of 2017 MBP's, to see if the cable worked for them.

I wouldn't worry about USB-c.
Not at all.
Use a regular USB-c charger to charge the computer.
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