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User profile for user: NewHampshireMacGuy
NewHampshireMacGuy Author
User level: Level 1
8 points

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

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User profile for user: leroydouglas
leroydouglas
Community+ 2024
User level: Level 10
183,828 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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User profile for user: leroydouglas
leroydouglas
Community+ 2024
User level: Level 10
183,828 points

May 9, 2019 10:20 AM in response to NewHampshireMacGuy

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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