iPhone 13โ17 Pro Max: In-Cell display replacement boots to a blank/black screen โ the Ambient Light Sensor โoptical windowโ problem (and what to do)
On OLED iPhones (13โ17 Pro Max), low-cost In-Cell/LCD replacement screens can sometimes boot with what looks like a dead display: the phone is on, but the screen stays blank or extremely dim. A common root cause is that the Ambient Light Sensor (ALS) and proximity/TrueDepth optical path is blocked or incorrectly filtered by the replacement panelโs top layers, forcing iOS to drive brightness to unusably low levels.
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