Schematic for the ASUS K40AB, a model of the K40 series laptop line, provided as a 1.17 MB PDF. The name does not state a board number or revision, so verify against the markings on the actual mainboard before relying on component values. Such diagrams are used to follow power rails, check the battery charger and standby circuits, trace display and USB signals and identify parts when hunting a short to ground. Any PDF reader opens it, and searching net names speeds up locating a circuit block.
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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How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.