Phone schematic page in PDF for the power and volume key circuit, labelled ON_OFF_VOL, with no model stated in the name. It belongs to a set of sectioned files of about 4.77 MB. The diagram typically shows the side key flex connector, the power key line to the PMIC and the volume up and down lines, along with any ESD protection parts. Use it when a device will not power on from the button or keys fail to respond, checking continuity from the switch to the processor or PMIC pins.
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 @phoneSchematics. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.