How to Tell Whether Your New LG UltraFine 5K Display Has the Shielding Fix

by

Last week, we shared a brief video showing that LG's revisions to the shielding in the UltraFine 5K display have successfully addressed issues with the display flickering and disconnecting when in close proximity to Wi-Fi routers. Apple and LG had temporarily pulled the display from the market while LG adjusted its manufacturing processes to incorporate the fix and push the new stock into sales channels, and sales of the revised display began earlier this month.

At the time of last week's post, we noted that customers purchasing the UltraFine 5K display should check for serial numbers beginning with 702 or 703, as these indicate manufacturing dates of February or March after the fix was put into place. Several MacRumors readers subsequently reported, however, that they have recently received units shipped from Apple with serial numbers starting with 612, indicating manufacturing dates in December 2016.

These readers have been uncertain as to whether their units have the revised shielding in place, or if they should be testing their displays to see if the flickering issue can be induced. One reader noticed that the label on the box of his December UltraFine 5K included a black circular sticker at the top left, a sticker that was not present on our original UltraFine 5K display that was manufactured in November and shipped in December and which was susceptible to the interference issue.

ultrafine circle square fixed

December 2016 unit retrofitted prior to sale (left) vs. March 2017 unit properly shielded from the start (right)

Newly manufactured UltraFine 5K units include a black square printed directly on the label in the same location, and LG has confirmed to MacRumors that the presence of a circle or square does in fact indicate that the unit has the revised internal shielding and should be protected from the interference issues.

While LG did not explicitly confirm any difference between a circle and a square, it appears that the square is indicative of a unit that was originally manufactured with the proper shielding, while the circle is used on earlier units that were subsequently retrofitted with the shielding before sale. There should be no difference in the performance of the two versions.

For those users with units lacking a circle or square on the label and thus susceptible to the Wi-Fi interference, LG is conducting free repairs to install the proper shielding. Users are advised to contact LG to arrange for the repair, which can take up to 7-10 business days once the display is received by the repair facility.

Customers interested in purchasing the UltraFine 5K should remember that Apple's 25 percent discount on USB-C and Thunderbolt 3 accessories is still scheduled to end on March 31, so they have just over a week to order the display at its discounted price of $974 before it goes back up to its regular price of $1299.95. It is possible Apple could extend the discount as it has done once already, but there are no guarantees.

Related Roundup: Apple Pro Display XDR
Tag: LG

Top Rated Comments

craig1410 Avatar
48 months ago

That circle / square sticker thing seems to stack up. As expected, my 701s are both circles. But yeah, I still won't be returning them, as there are no obvious indicators now that these displays are inferior in any way to "square" models. Maybe when I go to sell these on eBay in 5 years, my dreaded "circle sticker" will knock $50 off the price though ;)

Still, it's dubious that LG / Apple are selling these circle models as "new". This is almost the very definition of manufacturer-refurb right? Apart from the fact that they weren't necessarily "returned" by customers (unless you count Apple as LG's customer). They've still been opened, refurbished in-a-sense, and repacked.

I think as long as they are "unused" then it's okay to sell as new, even if they were upgraded and repacked.
Score: 1 Votes (Like | Disagree)
Corrode Avatar
48 months ago
Thanks for writing about this. I pick up my fourth display (third replacement) tonight. Hoping for a square!
Score: 1 Votes (Like | Disagree)

Top Stories

2020 apple shopping event

Apple Offering Up to $150 Gift Card With Select Products on Black Friday Through Cyber Monday

Monday November 23, 2020 2:53 am PST by
Apple has announced its annual four-day shopping event, offering customers up to a $150 Apple Store gift card with the purchase of select products between Black Friday and Cyber Monday in the United States. The gift card values in the United States are as follows: $150 for 16-inch MacBook Pro $150 for 21.5-inch iMac $50 for 13-inch MacBook Pro $50 for MacBook Air $50 for iPhone SE,...
0 Deals Hero

Black Friday 2020: Best Apple Deals to Plan For

Saturday November 21, 2020 10:00 am PST by
In the lead-up to Black Friday next week, we've been putting a spotlight on the best deals coming from various retailers like Best Buy and Walmart. In an effort to further prepare our readers for the best Black Friday deals, we're breaking down what we think should be on your radar for Black Friday in 2020. Note: MacRumors is an affiliate partner with some of these vendors. When you click a...
app store christmas icon

Apple Shutting Down App Store Connect From December 23 to December 27

Monday November 23, 2020 10:14 am PST by
Apple shuts down App Store Connect for a week around the holidays each year in an effort to give App Store staff time off from work. This year, App Store Connect will be unavailable from December 23 to December 27. With App Store Connect unavailable, Apple will not accept new apps or app updates, so all pricing changes and new app submissions need to be locked in before those dates for...
Target November Deals 1

Black Friday Spotlight: Target Begins Week-Long Sale With Deals on iPhone 12, Powerbeats Pro, and More

Monday November 23, 2020 8:07 am PST by
We've been tracking early Black Friday deals in our dedicated Black Friday Roundup, and in an effort to prepare our readers for the big shopping event we're highlighting sales store-by-store in the lead-up to November 27. Note: MacRumors is an affiliate partner with Target. When you click a link and make a purchase, we may receive a small payment, which helps us keep the site running....
ipad pro 2020 display

Black Friday Week Kicks Off With Up to $150 Savings on 2020 iPad Pro

Sunday November 22, 2020 2:37 pm PST by
As we head into Black Friday week, we're seeing some of the best deals of the season so far, with Amazon and Best Buy today discounting the latest iPad Pro models by up to $150 at the lowest prices we've ever tracked on these models. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a purchase, we may receive a small payment, which helps us keep ...
mac mini macbook pro macbook air

Apple M1 Hands-On Comparison: MacBook Air vs. MacBook Pro vs. Mac Mini

Monday November 23, 2020 3:40 pm PST by
Apple's M1 Macs are out in the wild now, but ahead of the holidays, you might still be trying to figure out which one to pick up, either for yourself or as a gift for someone else. We've got all three of the new Macs available, so we thought we'd give MacRumors readers a hands-on overview of each machine in our latest YouTube video. Subscribe to the MacRumors YouTube channel for more videos. ...
macos big sur m1 macs restore issue

Apple Provides Instructions to Fix macOS Reinstallation Errors on M1 Macs

Sunday November 22, 2020 3:30 pm PST by
Shortly after the launch of Apple's new M1 Macs, we saw reports that attempts to restore and reinstall macOS on those machines right away could result in an installation error that would leave your Mac non-functional. Specifically, the error message would read: "An error occurred preparing the update. Failed to personalize the software update. Please try again." Over the weekend, Apple p...
max tech xcode benchmark m1 macbook

Video Demos Performance Differences Between 8GB and 16GB Apple M1 MacBook Pro

Monday November 23, 2020 2:54 pm PST by
All of the M1 Mac models use the same M1 chip, so the upgrade options are limited to SSD storage space and RAM. We haven't seen many comparisons that demonstrate the difference between a machine with 8GB RAM and the upgraded 16GB RAM option, but Max Tech today shared a video highlighting the performance between an 8GB MacBook Pro and a 16GB MacBook Pro. The video includes a series of...
iPhone 6s main

Rumor Claims iOS 15 to Drop Support for iPhone 6s and Original iPhone SE

Sunday November 22, 2020 9:25 am PST by
Apple will drop support for the iPhone SE, iPhone 6s, and iPhone 6s Plus in next year's release of iOS 15, according to a rumor shared today by Israeli site The Verifier. If the rumor is accurate, that would mean iOS 15 will be compatible with the following Apple devices: 2021 iPhone series iPhone 12 Pro Max iPhone 12 Pro iPhone 12 mini iPhone 12 iPhone 11 iPhone 11 Pro iPhone 11 Pro ...
new mac mini logicpro screen

M1 Macs Able to Run Up to Six External Displays Using DisplayLink

Tuesday November 24, 2020 6:53 am PST by
It is possible to run up to six external displays from the M1 Mac mini, and five external displays from the M1 MacBook Air and MacBook Pro, with the aid of DisplayPort adapters, according to YouTuber Ruslan Tulupov. This far exceeds Apple's specified limits on external displays with the M1 Macs. Apple's host of new M1 Macs are not capable of supporting as many external displays as their...