LG's UltraFine 5K Display Shielding Fix Successfully Addresses Wi-Fi Interference Issues

LG's UltraFine 5K Display returned to the market earlier this month after LG made some changes to the display's shielding following the discovery that the original design left the display vulnerable to interference from Wi-Fi routers and other electronics. The issue was a bit of a black eye for Apple, considering the company recently elected to exit the display market and instead partnered with LG on the new 27-inch UltraFine 5K and its smaller sibling, the 21.5-inch UltraFine 4K.

We purchased one of the original UltraFine 5K units back in December, with our model carrying a manufacturing month of November 2016 based on its serial number. LG has now provided us with a unit manufactured last month after the design revisions were put in place, and we've had a few days to compare the performance of the two units in the presence of Wi-Fi routers.


In day-to-day usage, we failed to see any issues with the original model, even with an AirPort Time Capsule located just three feet from the display, inside the two-meter radius LG recommended users should keep as a minimum once the company discovered the issue.

We were, however, able to induce the issue in the unit by bringing another Time Capsule into very close proximity with the rear of the display, causing it to flicker and disconnect from the host computer. The display sometimes reconnected to the computer on its own once the interference was removed, but other times it required that the Thunderbolt 3 cable be briefly unplugged or even the entire UltraFine 5K be power cycled before it would reconnect.

With the revised UltraFine 5K Display in hand, we've been able to subject both displays to side-by-side testing that confirms the issue has been successfully addressed. While the issue is easily reproducible on the original model as long as the Wi-Fi router is in close enough proximity, we were unable to recreate the issue on the revised model despite extensive efforts.


With Apple once again shipping the UltraFine 5K Display, new orders are currently showing in-stock availability in Apple's U.S. online store, although Personal Pickup remains unavailable.

Apple's discounted pricing on the display of $974 is scheduled to run through the end of this month, at which time the display will return to its normal $1299.95 price. Apple already extended its discounted pricing on USB-C and Thunderbolt 3 accessories once and it's possible the promotion could again be extended, but for those who want to make sure they receive the discounted pricing, they should be sure to order by March 31.

Customers purchasing the UltraFine 5K Display, regardless of what vendor they use, should make sure they are receiving revised units to ensure they are protected from the Wi-Fi interference issue. The first three digits of the display's serial number (visible on the exterior of the box) correspond to the last digit of the year and the two-digit month of manufacture, so buyers should look for serial numbers starting with 702 or 703.

Those who purchased earlier units may be eligible for repairs if their units are exhibiting the interference issue, and affected customers should contact LG or Apple for information on repair procedures.

We've arranged for a repair of our affected unit through the live chat option. Once the repair request is initiated it can take a day or two to receive a shipping label and repair details, and LG tells us it can take up to 7-10 business days for the actual repair once the display has been received at the service facility.

Related Roundup: Apple Pro Display XDR
Tag: LG

Top Rated Comments

(View all)
Avatar
42 months ago
Still an awful mess of a display. Should have nothing to do with the Apple brand whatsoever. Completely off brand.
Score: 18 Votes (Like | Disagree)
Avatar
42 months ago
When are they going to fix the design :)
Score: 16 Votes (Like | Disagree)
Avatar
42 months ago
I'm still bummed that Apple never made its own 5k Cinema Display. Wish they didn't abandon it. Would be nice to have the same quality external screen to match my Apple MacBook Pro. Oh well.
Score: 11 Votes (Like | Disagree)
Avatar
42 months ago

Still an awful mess of a display. Should have nothing to do with the Apple brand whatsoever. Completely off brand.

I’d pay 25% more for this display, in an Apple enclosure. LG does make excellent panels, and my 65” OLED LG TV is in an arguably very attractive enclosure (even nearly Apple worthy), so I’m sure how this montior got out of the industrial design room.
Score: 9 Votes (Like | Disagree)
Avatar
42 months ago
Even though it was a botch job, it is commendable they owned it and addressed it instead of hiding in secrecy/being in denial.
Score: 7 Votes (Like | Disagree)
Avatar
42 months ago
I just don't like the look of the display. I'm sure it's nice, but it doesn't have that Apple fancy I'm used to. It looks plain and boring.
Score: 6 Votes (Like | Disagree)

Top Stories

Leaker: Apple to Stick With Lightning Over USB-C for 'iPhone 12' Before Going Port-Less Next Year

Tuesday May 26, 2020 2:31 am PDT by
Apple will use a Lightning port instead of USB-C in the upcoming "iPhone 12," but it will be the last major series of Apple's flagship phones to do so, with models set to combine wireless charging and a port-less Smart Connector system for data transfer and syncing in the iPhone "13 series" next year. The above claim comes from occasional Apple leaker and Twitter user "Fudge" (@choco_bit),...

Apple Releases macOS Catalina 10.15.5 With Battery Health Management Features, Fix for Finder Freezing

Tuesday May 26, 2020 1:59 pm PDT by
Apple today released macOS Catalina 10.15.5, the fifth update to the macOS Catalina operating system that was released in October 2019. macOS Catalina 10.15.5 comes two months after the launch of macOS Catalina 10.15.4, which introduced Screen Time Communication Limits. macOS Catalina 10.15.5 is a free update that can be downloaded from the Mac App Store using the Update feature in the...

Apple Reissuing Numerous iOS App Updates, Potentially Related to Recent 'This App is No Longer Shared' Bug

Sunday May 24, 2020 9:13 pm PDT by
Over the past few hours, a number of MacRumors readers have reported seeing dozens or even hundreds of pending app updates showing in the App Store on their iOS devices, including for many apps that were already recently updated by the users. In many cases, the dates listed on these new app updates extend back as far as ten days. Apple has not shared any information as to why updates for...

16-Inch MacBook Pro, iPad Pro, and iMac Pro With Mini-LED Displays Again Rumored to Launch in 2021

Tuesday May 26, 2020 5:30 am PDT by
Apple plans to release several higher-end devices with Mini-LED displays in 2021, including a new 12.9-inch iPad Pro in the first quarter, a new 16-inch MacBook Pro in the second quarter, and a new 27-inch iMac in the second half of the year, according to Jeff Pu, an analyst at Chinese research firm GF Securities. This timeframe lines up with one shared by analyst Ming-Chi Kuo, who recently...

Jailbreak Tool 'unc0ver' 5.0 Released With iOS 13.5 Compatibility

Sunday May 24, 2020 3:06 pm PDT by
The team behind the "unc0ver" jailbreaking tool for iOS has released version 5.0.0 of its software that claims to have the ability to jailbreak "every signed iOS version on every device" using a zero-day kernel vulnerability by Pwn20wnd, a renowned iOS hacker. The announcement comes just days after it was announced that the tool would soon launch. The unc0ver website highlights how the tool...

Future AirPods to Include 'Ambient Light Sensors' Possibly Related to Rumored Health Features

Monday May 25, 2020 2:53 am PDT by
Apple is reportedly looking to integrate light sensors in a new model of AirPods in the next couple of years, according to a new report today, suggesting their use could be part of rumored upcoming health monitoring features in the true wireless earbuds. In a paywalled article, DigiTimes reports that ASE Technology could be involved in manufacturing the sensors: Apple is expected to...

First App Using Apple and Google's Exposure Notification API Launches in Switzerland

Tuesday May 26, 2020 3:02 pm PDT by
The first app that takes advantage of the Exposure Notification API developed by Apple and Google has launched in Switzerland, according to a report from the BBC. A team of app developers working on contact tracing app called SwissCovid have rolled out the app in a beta capacity for members of the Swiss army, hospital workers, and civil servants. After the app is tested and approved by MPs,...

'This App is No Longer Shared' iOS Bug Preventing Some Apps From Opening

Friday May 22, 2020 3:58 pm PDT by
An app bug is causing some iOS users to be unable to open their apps, with affected iPhone and iPad users seeing the message "This app is no longer shared with you" when attempting to access an app. There are multiple complaints about the issue on the MacRumors forums and on Twitter from users who are running into problems. A MacRumors reader describes the issue:Is anyone else experiencing...

HBO Max Now Available on Apple TV and iOS Devices

Wednesday May 27, 2020 2:42 am PDT by
HBO Max launched today, and is now available on Apple TV, iPhone, and iPad. WarnerMedia's new streaming service, which replaces HBO Now, combines HBO content with shows and films from Warner Bros and Turner TV. The service is available as a native app on the ‌Apple TV‌ HD and ‌Apple TV‌ 4K, but second and third-generation ‌Apple TV‌ owners will need to AirPlay HBO Max content...

Apple's Pro Display XDR Wins 'Displays of the Year' Award

Tuesday May 26, 2020 7:45 am PDT by
The Society for Information Display today announced its selections for the 26th Annual Display Industry Awards, and Apple has once again taken one of the top spots, this time with its Pro Display XDR that debuted last year alongside the revamped Mac Pro. The Pro Display XDR was one of three display products named "Displays of the Year," alongside Samsung's foldable display and BOE's...