PDF document for the ASUS K55VD, also listed as K55V, that the name calls a repair guide and that is indexed with the schematics. No board revision is given, so compare it with the markings on your mainboard. Material of this kind usually explains the power-on sequence, main voltage rails and typical fault points, which helps when diagnosing a dead board, missing standby voltages or charging faults. Open it in any PDF reader and use it together with a multimeter to confirm the expected voltages at the listed test points.
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.