Schematic PDF titled IPISB-NK, 941 KB, with no brand or revision given in the name. IPISB-NK is a Pegatron board code used in some all-in-one PCs, so compare it against the marking on your board. A schematic like this is used to follow power rails from the input through each regulator, check enable and power-good signals, and find the values of resistors and capacitors around a faulty circuit. Search the PDF for net names to move quickly between pages, and confirm the revision on the title block.
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 @hrtechno. 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.