Schematic drawing set for the IBM ThinkPad T40 in PDF format, 1.08 MB. Beyond the model, the name provides no board number, revision or configuration details. The document is intended for component-level repair: checking power rails, following enable and power-good signals, and finding the part responsible for a short to ground. Search inside a PDF reader to jump to a net name. Because related ThinkPad models can share similar layouts, check the PCB markings against the drawing before you trust specific 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.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.