ThinkPad T60 schematic in a 1.63 MB PDF, with GM in the name most likely pointing to the 945GM chipset build with integrated graphics; no revision is stated. A separate PM version exists for discrete-graphics boards, so match it carefully with your unit. Use it to trace power rails, follow chipset and memory signals, locate components and test points and diagnose shorts. Check the board identifier in the title blocks against the motherboard label before relying on component values.
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.