Dell Vostro 3450 schematic in PDF form, 805 KB. The name lists no ODM board number or revision, so check the title block inside for the project code before relying on it. Dell laptops are typically built by ODMs such as Compal, Wistron or Quanta, and the motherboard silkscreen shows the matching number. Use the schematic to trace power rails, the charger circuit and the power sequence, and to locate component values. Compare that silkscreen with the document first.
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 @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.