As the iPhone Duo reaches users’ hands, a wave of fascination with its slim design and innovative hardware has emerged, but it was quickly met with concerning reports about sudden cracks and damage appearing on the internal screen along the hinge line. This is where the famous teardown team iFixit comes in, putting the phone under their microscope to uncover its engineering secrets, test its resistance to dust, and most importantly: attempt to solve the mystery of those enigmatic cracks affecting the foldable screen.
The harsh dust test… How does the hinge hold up?
Before beginning the mechanical teardown, the team subjected the iPhone Duo to a harsh test by dousing it in extremely fine fluorescent dust to examine the effectiveness of its seals. The phone carries an official IP68 water and dust resistance rating, an achievement that is not easy in the world of foldable devices. The results showed that dust settled in the USB-C port, the speaker grille, and the outer frame, while the sensitive internal components remained largely protected and clean.
Despite this good durability, some fine particles managed to sneak into the hinge itself, causing an annoying sound when opening and closing, which poses a real risk that could eventually lead to damage to the screen from underneath. Interestingly, the iPhone Duo’s hinge showed better cohesion and collected less dust compared to phones like the Galaxy Z Fold8 and Pixel 11 Pro Fold in similar tests. However, the team advised against taking the phone to sandy beaches; moving parts remain, by nature, a weak point for any abrasive dust.
The screen cracking mystery: What happens below the fold line?
One of the most important goals of the teardown was to investigate user complaints about breakage or white pixel lines along the hinge. To explain the phenomenon, iFixit engineers built a 3D model of the hinge based on teardown footage, published patents, and CT scans, then compared this model with common damage locations.
The result was surprising; the faults are not concentrated directly above the screen’s flexible cable, but slightly below it, specifically in the transition area where the cable gap meets the central hinge support. At that point, different geometric edges meet and change how the ultra-thin screen is supported while folding, which may lead to a concentration of immense mechanical stress on a very narrow area.
The team also proposed another hypothesis regarding the curved hinge tracks that follow the screen’s pivot points. It seems these tracks may rise slightly above the flat plates of the hinge when the device is closed, and the location of one of these tracks matches exactly with the location of the recorded fractures. Alternatively, there might be a mechanical part that is supposed to retract during folding but gets stuck, creating concentrated pressure that leads to either a tear in the panel layers or a malfunction in the screen’s delicate connections.
Ingenious internal engineering: A flat logic board and an exceptional battery
When delving inside the device, the extent of the engineering ingenuity Apple employed to reduce thickness becomes clear; the company adopted a single-layer logic board, the first time we have seen this design in an Apple phone since the iPhone 8. This move saved vital space that allowed the device to maintain its ultra-slim appearance without sacrificing essential hardware.
As for the batteries, Apple used adhesive technology that dissolves via a simple electrical charge, a feature first introduced in the iPhone 16 family. iFixit described the battery removal process as the best and smoothest battery replacement experience they have seen in any foldable phone to date, as they come out without any bending or risk of damaging the cells.
Multi-layered screens and repairability
The internal screen of the iPhone Duo consists of a complex matrix comprising 10 different layers. Apple provides a top protective layer with nano-technology that is peelable and directly replaceable. Apple designed this layer to be quickly changed at service centers at a low cost of $19 for AppleCare+ subscribers and $49 for non-subscribers. Despite the ease of removing it, the company warns users against trying to peel it off themselves to avoid damaging the deeper layers.
On the other hand, the team praised the durability of the external screen and the ease of removing it without breaking it, which is essential because accessing most internal components requires passing through it first, while the internal screen requires heat and patience to dismantle the adhesives surrounding its frame.
At the end of the teardown, iFixit gave the iPhone Duo a score of 5 out of 10 on the repairability scale. Although this number seems modest for traditional phones, it makes it the most repairable foldable phone compared to its direct competitors like the Galaxy Z Fold8 and Pixel 11 Pro Fold, which stopped at 4 out of 10. The availability of an official repair manual from day one and the ease of removing the external screen and battery gave it this advantage, although the complexity of the internal screen and hinge remains a major challenge for any repair technician.
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