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iPhone Duo cracking: hinge supplier denies blame as new gap reports surface

The iPhone Duo cracking story enters day three: a hinge component supplier says its parts are not to blame, owners report gaps at the hinge, and replacements are not always instant.

Fully open iPhone Duo showing a NYT Cooking recipe for chocolate lava cake on the left and reader comments on the right
The iPhone Duo fully open, with a recipe and comments either side of the fold | Image: Apple

The iPhone Duo screen cracking update is that the story is still moving. On October 26, 2026, a Korean company reported to make part of the Duo's folding display assembly said its components are not to blame, and by October 28 owners were reporting a second possible iPhone Duo hinge problem: visible gaps between the back panel and the hinge. Industry sources, meanwhile, are focusing on the hinge's central support plate. Nobody, including Apple, has established a cause, and the reports still come from a small number of owners after a launch where some stores ran out of walk-in stock, as the New York Post reported.

Key takeaways

  • Fine M-Tec, reported to make the backplate behind the Duo's folding screen, said on October 26 that the cracking is "not attributable to a quality defect in the components we supply," per the Seoul Economic Daily via Appdook.
  • Owners on Reddit report gaps between the Duo's back panel and hinge, Tech Advisor reported on October 28. Whether that affects the IP68 sealing is an open question.
  • Industry sources cited by The Elec focus on the hinge's central support plate, in line with iFixit's earlier theory. No cause has been confirmed.
  • Apple's guidance stands: contact AppleCare for a replacement. Owner experiences of getting one vary, the New York Post reported.

Where this started

This follows our report on iPhone Duo screens cracking along the hinge. In short: on October 26, Apple told 9to5Mac it is aware of an issue impacting the inner display on a small number of units and that affected owners should contact AppleCare for a replacement; 9to5Mac reported no AppleCare+ plan is needed. iFixit's theory was that a central hinge support bar may not drop far enough as the phone folds. That report also noted that some images circulating online were fake. What follows is what has happened since.

What did the iPhone Duo hinge supplier say? Fine M-Tec denies blame

Fine M-Tec, a Korean company listed on the KOSDAQ market, said on October 26 that the problem is "not attributable to a quality defect in the components we supply," the Seoul Economic Daily reported, according to Appdook's October 28 daily brief. Appdook notes that the statement names neither Apple nor the Duo. The paper says Fine M-Tec makes the backplate, a metal sheet that supports the folding panel from behind, and The Elec separately reports the company is a supplier of the internal hinge, or backplate, beneath the OLED panel. Neither company has confirmed the supply deal.

Per Appdook, Fine M-Tec also said it will consider civil and criminal action against people who link it to the fault without evidence, and its shares closed 15.7% lower on the day of the statement.

Is there a second iPhone Duo hinge problem? The gap reports

A second reported issue surfaced on October 28. Tech Advisor reported that Reddit user MICAPe9 posted a video titled "Check your Duo" showing a clear gap between the device's back and the hinge when closed, with the back appearing to have lifted or bowed so the hinge mechanism shows through. Another Reddit user, MrOsterhagen, replied that the gap on their phone was large enough to see the hinges, with "a small but noticeable bow" in the top half, and Tech Advisor says several other users reported a similar issue.

That raises a question about sealing. Tech Advisor points out that the Duo is rated IP68 for water and dust, as our full specs page lists, and argues a visible gap should not be there on a sealed phone. Whether these gaps actually compromise water and dust resistance has not been tested or confirmed by anyone, and none of the reports we read include an Apple comment on the gaps.

What is the industry focusing on?

According to industry sources cited by The Elec, attention is on the central support plate and connecting components of the Duo's external hinge, which The Elec says has more than 100 precision components. When the Duo is unfolded, the support plate moves into position beneath the display; when it is folded, the plate moves downward to make room for the screen to bend. If a connecting component breaks or the plate fails to move properly, The Elec's sources say, the metal structure could press against the back of the OLED panel, and damage to its internal wiring could cause the bright lines owners describe. That is consistent with iFixit's earlier hypothesis, and it remains a theory, not a confirmed cause.

The Elec also reports attention on Apple's use of 3D printing for the Duo's titanium hinge cover, with some industry observers suggesting it may be linked to hinge durability. The same industry sources told The Elec that damage reports with similar symptoms, including cracks near the lower part of the central fold, long white lines extending to the right, and a cracking sound after folding and unfolding, have come from the United States, Australia and other markets.

How do I get a cracked iPhone Duo replaced?

Apple's guidance from October 26 has not changed: contact AppleCare for a replacement, and 9to5Mac reported no AppleCare+ plan is needed for this issue. What owners have experienced varies, according to the New York Post:

  • An Australian owner, posting as Midnight_Slump on Reddit, said Apple offered an express replacement that required a hold for the full price of the phone. He went to a nearby Apple Store instead, where staff swapped the damaged phone for a new one on the spot.
  • An owner in Dallas, posting as leftyhyzer16, said AT&T warned that replacing the phone through the carrier could push him to the back of the order queue in January. He went to the Dallas Apple Store, which had one in stock and swapped it immediately, at no charge.

For damage outside this issue, our AppleCare+ guide lists Apple's repair fees. And for the bigger picture on demand, TrendForce reiterated its iPhone Duo market share forecast this week, after launch week and before these latest reports.

Frequently asked questions

What is causing the iPhone Duo screen to crack?

No one has established a cause. Apple has acknowledged an issue on a small number of units without giving one. iFixit's theory is that a central hinge support bar may not drop far enough as the phone folds, and industry sources cited by The Elec likewise focus on the central support plate and its connecting components. Both are hypotheses, not confirmed causes.

What did the iPhone Duo hinge supplier say?

Fine M-Tec, the Korean company reported to make the backplate behind the Duo's folding screen, said on October 26, 2026 that the problem is "not attributable to a quality defect in the components we supply," according to the Seoul Economic Daily as reported by Appdook. Its statement names neither Apple nor the Duo, and neither company has confirmed the supply deal.

Are there gaps between the iPhone Duo back panel and hinge?

Some owners say so. Tech Advisor reported on October 28, 2026 that a Reddit user posted a video showing a clear gap between the Duo's back and its hinge when closed, and that several other users reported a similar issue. None of the reports we read include an Apple comment on the gaps, and how many units are affected is unknown.

How do I get an iPhone Duo with a cracked screen replaced?

Contact AppleCare. Apple says owners who experience issues with the iPhone Duo display should contact AppleCare for a replacement, and 9to5Mac reported that no AppleCare+ plan is needed for this issue. Owners' experiences vary: the New York Post reported owners whose phones were swapped on the spot in Apple Stores, and one whose express replacement offer required a hold for the full price of the phone.

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