Circuit schematic for the IBM ThinkPad Z61, listed under Lenovo, supplied as a 1.73 MB PDF. The name mentions Quanta together with the code BW2, which points to a Quanta-designed board referred to by that project name; no revision is given. Quanta schematics normally include block diagrams, power sequencing and detailed sheets for each subsystem. They are useful for measuring voltages at test points and chasing missing rails on a dead board. Check that the project code printed on the PCB matches BW2 before relying on the pinouts.
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.