Sony schematic in PDF format, 15.7 MB, named only z3, so the exact model is not stated; it may relate to an Xperia Z3 class device, but that cannot be confirmed from the name. Open it in any PDF reader and check the title block on the first pages for the model and board revision. Service schematics like this are used to trace power rails, follow signal lines between connectors and ICs, and identify component values when diagnosing shorts or no-power faults. Match the revision against your board before relying on it.
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 @Schematic_ir20. 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.