LG UltraFine 5K monitor - external devices not detected

Hi,

Few days ago I finally received my new LG UltraFine 5K display. I also purchased the new MacBook Pro (15 inch) with GPU upgrade, i7 upgrade and 1TB flash storage.

Connecting the LG display to the MacBook is working fine. However when I disconnect the LG display by unplugging the USB-C cable and subsequently reconnect the USB-C cable in the MacBook, the external devices in the other USB-C ports of the LG monitor are not detected.

I have a USB-C to USB adapter with a lightning cable for my iPhone plugged in & a Belkin USB-C to Ethernet adapter connected to my router. These two cables are not detected after unplugging and reconnecting the MacBook with the display.

I need to unplug both cables on the back of the display and plug them back in in order to have the monitor detect them.

Is this a known issue?

Posted on Dec 29, 2016 6:35 AM

Top-ranking reply

andrew54941

Level 1

8 points

Posted on Dec 6, 2017 12:21 PM

I found a solution that worked for me!

Download the LG Screen Manager from their website under software, firmware & drivers: http://www.lg.com/us/support-product/lg-27MD5KA-B

Open the app and Install the latest software update while the monitor is connected. After it completes unplug all USB devices devices and the monitor, then plug them in again.

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40 replies

JudahDE

Level 1

13 points

Jan 25, 2017 2:17 PM in response to Nick Brook

It is an issue... I have it and have been working towards a resolution. It's annoying but not critical. Should be fixed soon.

logicito

Level 1

52 points

Jan 25, 2017 2:45 PM in response to JudahDE

What kind of resolution?

Feb 8, 2017 5:33 PM in response to Chris Messineo

I have the same issue, being on a MacBook Pro 13Inch touchbar.

Apple please advise when can we expect a solution/fix for this issue, this is a topic now for more then six weeks.

Mar 21, 2017 10:57 AM in response to jackofsometrade

I am having the same issue - LG thinks its related to the shielding - I don't believe that is true. They are not supporting their defective monitors properly.

ardias

Level 1

11 points

May 3, 2017 2:10 PM in response to McMorrisDesigns

You are correct but even more seriously is that the issue occurs with the latest 15" MBP and the LG 5k - unacceptable!

ardias

Level 1

11 points

May 17, 2017 11:00 AM in response to JoelCraenhals

10.12.5 did NOT fix the Ethernet (cable unplugged) bug. 😟

Jul 4, 2017 12:25 AM in response to arthurfromrotterdam

I concur with Arthur. Please try and re-open the support thread as the issues seems far from being solved.

ardias

Level 1

11 points

Aug 4, 2017 11:28 AM in response to JoelCraenhals

I think that this issue was resolved by LG on 7-13-2017 with a software update. Just install LG Screen Manager and proceed to update the monitor. Link HERE.

Aug 8, 2017 10:54 AM in response to ardias

^ the latest LG software update fixed this for me.

logicito

Level 1

52 points

Aug 16, 2017 12:51 PM in response to defractor

What is the purpose of the Split Screen functionality? is it kind of hardware split screen? I can have 2 windows side by side

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LG UltraFine 5K monitor - external devices not detected