iFixit: iPhone 18 Pro variable aperture teardown flags display-frame concern

iFixit has published its teardown of the iPhone 18 Pro and iPhone 18 Pro Max, focusing on the new magnetically actuated variable aperture, a screwed-in battery tray, and a plastic display-frame issue that showed up on three of the four phones the team opened. 9to5Mac summarized the piece Sunday (September 20, 2026).

iFixit attributes the findings to its own teardown work; sample size is small, and several points below are provisional.

Variable aperture: six blades, magnetic drive

iFixit says the main camera packs six overlapping polymer-composite aperture blades into roughly the same footprint as last year. Actuation is magnetic — the team could open and close the iris by bringing a magnet near the mechanism, even with supporting hardware removed.

In the Camera app, Apple exposes four presets, per iFixit:

• ≈ ƒ/1.48 (widest)
• ≈ ƒ/1.8
• ≈ ƒ/2.8
• ≈ ƒ/4.0 (narrowest)

iFixit calls component-level aperture repair near-impractical: tolerances are tight, adhesives are gummy, and once blades are disturbed, reassembly is not a realistic path for most shops. The practical fix path is swapping the whole main-camera assembly — and iFixit notes that assembly itself is still modular and relatively accessible on both Pro models.

Display frame: damaged on 3 of 4 phones

The more uncomfortable repair note is the white plastic frame around the display. iFixit reports it cracked or pulled away on three of the four phones opened. Display panels themselves still worked after removal, but a broken frame is integral to the assembly — fresh perimeter adhesive will not fix broken plastic, and sealing/flush fit may suffer.

iFixit is careful not to overclaim: four phones are too few to establish a failure rate; other teardowns have avoided the damage; adhesive strength, heating, technique, or plastic variation could all matter. The frame design has been around since the 15 Pro, but iFixit says it has not caused this much trouble in prior years. One hypothesis: improved thermals may pull heat away from the seam during adhesive softening — still unproven.

Battery tray win; front-entry still required

iFixit credits the return of a metal battery tray held down by screws (remove tray + cell together; no fighting cell adhesive for a tray-level swap). That is a clear repair win — if you can open the phone without turning a battery job into a display job.

Front-entry through the glued-down display is still required for most serviceable internals; the back glass opens easily but only exposes the wireless charging coil in the panel.

Cooling, board layout, Face ID

Other hardware notes from the teardown:

• A larger vapor chamber (Apple has said about 3× the surface area vs the prior Pro generation)
• A20 Pro packaging with memory sitting beside the SoC (clearer thermal path to the chamber)
• Face ID infrared camera moved under the display (selfie camera and IR dot projector remain in the Dynamic Island opening)

For modem context on U.S. Pro Max units specifically, see our earlier TechInsights Snapdragon X80 teardown note.

Provisional score: 7/10

iFixit gives both the iPhone 18 Pro and Pro Max a provisional 7/10 repairability score. Strengths include the battery tray and modular cameras; the score is held back by near-universal front-entry through the screen. The damaged display frames have not fully tanked the score yet because prevalence and root cause are still unknown.

Bottom line: iFixit’s teardown makes the variable aperture look like precision engineering that is not meant for blade-level fixes, while leaving an open question about how often the plastic display frame survives a careful opening. Treat the frame issue as a flag, not a settled failure rate.

Sources: iFixit — Inside the Tiny Unfixable Eye (September 20, 2026); 9to5Mac — Marcus Mendes.