Boardview covering the Apple iPhone 6S, provided in .bvr format at 316 KB. The name carries only the model, with no board number or revision, so verify against your logic board before measuring. Opened in a viewer that supports BVR files, it shows part outlines, designators and net connections on both sides of the PCB. That makes it practical for finding which capacitor sits on a shorted rail, tracing a charging or backlight circuit and locating test pads around the CPU, NAND and power management area during board-level repair.
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 @SMART_PHONE_SCHEMATICS. Enginerys does not host this file.
How to open a .bvr file
Text boardview from the BoardView R family of tools, seen for Lenovo, MSI and Clevo boards.