BVR boardview of the iPhone 5S logic board, 254 KB, with no variant, board number or revision stated in the name. Since 5S boards exist in several regional radio versions, compare this layout with the board in hand before trusting component positions around the baseband area. Opened in a boardview viewer it shows parts on both sides, net connections and test pads. Techs use it to follow power lines, locate the source of a short, identify blown filters or coils and pick convenient measuring points during diagnosis.
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 @GENERAL_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.