Boardview for the standard iPhone 7 logic board, delivered as a 364 KB .bvr file. The name does not say whether it covers the Intel or the Qualcomm modem version, so compare the radio area with your board before probing there. In a compatible viewer the layout shows every component, its nets and connections, which speeds up tracing power rails, locating filter capacitors on a shorted line and identifying connector pinouts. It is commonly paired with a schematic and diode-mode readings when diagnosing no-power, charging or audio codec faults.
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.