Schematic PDF labelled Z94Rp, a short board code with no brand stated in the name. The trailing p may denote a variant or revision, but the name does not confirm it. At 899 KB the document most likely holds the core circuit pages: power sequencing, charger, CPU and memory rails, and connector pinouts. Open it in any PDF reader and use text search to find net names and reference designators while tracing a dead rail or a short. Before relying on it, compare the board code silk-screened on the PCB with Z94R, as close variants differ in parts.
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.