Schematic in PDF format, 551 KB, labelled only SY3, with no brand, model or board number in the name. SY3 may be an internal project code from the board maker, but the file name alone cannot confirm which device it belongs to. Open it in any PDF reader and check the title block and page headers for the model and revision. Once the match is confirmed against the PCB markings, it can serve for tracing power rails, following signals and finding the components behind a short or a missing voltage.
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.