RAR file of 2.16 MB labelled for the Apple iPhone 6. Only the model name is given, so the archive could contain a schematic, boardview or both, and should be checked after unpacking. Such documents let a technician locate components on the logic board, trace rails from the battery connector, identify the touch IC circuitry and measure diode values at test points. Make sure the files are for the regular iPhone 6, not the 6 Plus, and that the board revision matches before replacing parts.
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 @cyberlanelectonik. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.