iFixit's teardown of the iPhone Duo points to the hinge as a possible reason some inner screens are cracking, though the site stops short of a firm answer.
Using teardown footage, patents and CT scans, iFixit built a 3D model of the hinge and compared it with photos of reported damage. The breaks cluster slightly below the point where the display cable crosses the hinge, at a spot where several edges meet and change how the thin screen is supported as it bends. iFixit also floated the curved hinge rails, which may lift above the flat plates as the phone closes, with one rail lining up with the damage. A retracting part that fails to retract is possible too. Pressure, a trapped particle, repeated bending and a manufacturing defect all remain on its list, and a wiring fault can mimic a cracked panel.
The rest of the teardown is friendlier. The phone is rated IP68, and after iFixit dosed it with fluorescent dust, particles reached the USB-C port, speaker mesh and bezel but few got inside. Dust that did enter the hinge made the magnets that hold the phone shut fail. Batteries release with a small electrical charge, which iFixit called the best battery removal experience on a foldable so far. The outer display comes off intact, and the nano-texture cover layer peels away easily. Apple designed it for cheap replacement: $19 with AppleCare+, $49 without.
The result was a provisional repair score of five out of 10. A repair manual was available on day one, but the inner display, held down by a lot of adhesive, and the hinge assembly cost points.
That split matters. A foldable can be easy to open and still be costly to fix if the part most likely to fail sits under the display. "This is the most repairable foldable smartphone we've seen so far, and it's still going to be a bear to repair," iFixit said. Its crack theory is also inference from outside photos, not a failure analysis of broken units, so the open question is whether Apple's own data will say the same.