Schematic in PDF format for a Dell 15 3000 series laptop, with FX3MC in the name, probably a Dell part or board identifier, plus a numeric prefix of unclear meaning. The file is 4.78 MB. Technicians use such diagrams to follow power rails, check the charging and power sequence, trace signals and read component values while locating a short. Since the 15 3000 series covers many boards, compare the board number in the title block with the one printed on your PCB 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 @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.