Schematic diagram for the Apple iPhone 6, supplied as a 3.96 MB PDF. The circuit pages let a technician trace power rails from the PMIC, follow signal lines to connectors, and identify the parts around faults such as no power, no charging or no backlight. Open it in any PDF reader and search by net or reference designator. Pair it with a boardview to find the physical locations, and check the logic board matches the iPhone 6, not the 6 Plus.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @Schematics_Mobile. Enginerys does not host this file.
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How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.