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A stuck aperture on the iPhone 18 Pro costs a whole camera assembly
iFixit says a stuck aperture on the iPhone 18 Pro likely takes a new main camera assembly, and it points at the phone's improved cooling to explain the display frames that cracked on three of the four units it opened.
The Product Desk · Product desk
What happened
- iFixit's iPhone 18 Pro teardown shows the variable aperture's six tiny blades moved by electromagnets, working independently of the optical image stabilization system that uses the same approach.
- One of those blades flew out while the team was dismantling the lens stack, and iFixit says a stuck aperture would likely require replacing the entire main camera assembly.
- iFixit found the plastic frame around the display damaged on three of the four iPhone 18 Pro units its team opened.
- Apple has used this same plastic frame since the iPhone 15 Pro, iFixit notes, and other teardowns of the phone have not hit the same frame damage.
- The iPhone 18 Pro and Pro Max both carry a provisional repairability score of 7 out of 10 while iFixit waits for parts and runs more tests.
Compiled by The Product DeskSomething wrong?How this is made
Why it matters
- cost An aperture fault bills as a camera assembly, so the customer or the warranty pool pays for optics and sensor to fix a blade.
- exposure The risk from a cracked frame is water resistance, and it surfaces in a customer's pocket weeks after a screen job the shop considered successful.
- constraint The battery sits in a glue-free tray, but the route to it is the display, so frame fragility taxes work that has nothing to do with the screen.
- decision If the cooling really is pulling heat off the display, shops have to decide whether to change their heating routine now or wait for the data to come in.
iFixit credits this design with modular camera assemblies, carried over from last year's Pro [12]. At the repair counter, that modularity also has a price. The module is the smallest thing a technician can order, so one misbehaving blade is billed as the whole optical stack [3]. 9to5Mac's report on the teardown does not include a price for that assembly [14].
iFixit's suspicion about the cracked frames falls on the cooling. It suggests the improved thermal system may be drawing heat away from the display while the heating pad tries to soften the adhesive [7]. Apple said the new vapor chamber has three times the surface area of the one in the iPhone 17 Pro, and that the A20 Pro's package puts the silicon die side by side with the memory so the chip connects directly to the chamber [8][9]. A better heat spreader under a heating pad is a plausible route to a technician pulling on adhesive that never softened.
The sample is four phones, and one of them came out with its frame intact [1]. The consequence shows up after reassembly. iFixit says a cracked frame means the display may no longer sit perfectly flush, and could compromise the phone's water resistance [10].
The people who answer for that are the shop that quoted a screen replacement and now has to explain a water-resistance caveat, and whoever signs off on out-of-warranty camera repairs for a fleet of handsets.
What sorts the work for both of them is whether the failing part is its own module, and whether the job requires going in through the display [12]. The aperture is modular and behind the display, and it is the expensive one, because the part number covers far more than the fault [3]. The USB-C port is worse: iFixit says replacing it requires removing much of the phone's internals [11]. The battery is the easy case by comparison, sitting in a glue-free tray once the display is off [12].
What to watch
- Whether iFixit's provisional 7 out of 10 holds once parts arrive and a main camera assembly can be priced.
- Whether independent shops report display frame cracking at anything near the rate iFixit saw once volume repairs begin.
- Whether Apple revises its adhesive-softening guidance for a phone whose vapor chamber pulls heat off the display.