Schematic for Sony mainboard MBX-224, with M960 and M970 in the name, which appear to be ODM project codes covered by the same document. The 998 KB PDF has no revision or end model listed, so confirm the board from its silkscreen. Use it to trace power rails, inspect the charger and regulator stages, find test points and identify components around a short. Check which of the two variants your board is, as fitted parts may differ between them.
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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The same file was posted more than once. If one link is dead, try the next.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.