Schematic for the Lenovo B450 in a compact 819 KB PDF. The name also contains la and 14, which could refer to a board or revision but cannot be read with confidence, so check the title block for the board number and revision. Technicians use such drawings to follow supply rails, check the charger and regulator outputs, read the power-on sequence and locate shorted parts. Any PDF reader opens it. Match the board number printed on the PCB to the document before relying on part references.
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.