Boardview file for the Apple iPad 2 main logic board, in .pcb format at about 20.1 MB. It reveals component placement on both sides along with net names and connections, which speeds up hunting for a shorted capacitor, checking charging and backlight circuits or identifying a missing part. Viewers such as OpenBoardView or FlexBV can open compatible .pcb boardviews. Because iPad 2 was produced in Wi-Fi and cellular versions, compare the board you have with the layout shown 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 @boardview. Enginerys does not host this file.
How to open a .pcb file
In repair archives a .pcb is typically an XZZ (XinZhiZao) boardview — popular for phones and recent laptops.