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LG Ultrafine 4K Display Selective Flickering

I have a 2018 13" MacBook Pro with TouchBar. I recently purchased a refurbished LG UltraFine 4K Display (made specifically for the MacBook Pro). When I plug in the USB C (Thunderbolt 3) cable into one of the ports on the right side of my computer, the LG display will flicker (lose video output) about once every 1-5 minutes. When I plug the cable into one of the ports on the left side of my computer, there is no flickering whatsoever. The cable is completely tight in the ports on both the left and right sides. The right side USB C ports also work flawlessly when transferring data, charging my laptop, etc;

Has anyone else had a similar experience? Is this something I should get checked out?

MacBook Pro 13”, macOS 10.14

Posted on May 9, 2019 9:32 AM

Top-ranking reply

leroydouglas

Community+ 2024

Level 10

188,412 points

Posted on May 9, 2019 10:20 AM

NewHampshireMacGuy wrote:

I have a 2018 13" MacBook Pro with TouchBar.

Is this something I should get checked out?

Then stick with the port that works.

Using 4K displays, 5K displays, and Ultra HD TVs with your Mac - Apple Support  https://support.apple.com/en-us/HT206587

Get help with video issues on external displays connected to your Mac - Apple Support  https://support.apple.com/en-us/HT20117

2018 models ship with Intel's eighth-generation Core i5 or Core i7 processors,

maximum data transfer speeds up to 40Gb/s on all four Thunderbolt 3 ports

However —

2016/ 2017 models of the 13-inch MacBook Pro with Touch Bar, limiting full speeds to the two left-side Thunderbolt 3 ports, with reduced bandwidth on the right-side ports.

If you are concerned take it in you can get a free over the counter 'Apple Service Diagnostics' test /assessment

Make an appointment for a "hardware issue"—

https://www.apple.com/retail/geniusbar/

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LG Ultrafine 4K Display Selective Flickering

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