Schematic in PDF for the Toshiba Satellite C850 and C855, which share a mainboard design. The name does not give the board number or revision, so open the title block and compare its number with the marking on your PCB, since these series were built on more than one board. The diagram helps trace the power path from the DC jack and charger, find shorts on main rails and check signals around the chipset and memory. Any standard PDF reader will open the 2.78 MB file.
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 @schematicslaptop. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.