Schematic PDF of 672 KB labelled only C660, with no brand, board number or revision in the name. The model designation may match a laptop series such as the Toshiba Satellite C660, but this has to be confirmed from the title block in the document itself. Technicians use such diagrams to trace voltage rails, locate protection components and follow signals when diagnosing no-power or no-display faults. Compare the board number on the PCB with the schematic before relying on any values.
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 @hrtechno. 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.