Service document for the Samsung SM-J510MN (Galaxy J5 2016), a 3.65 MB PDF whose name points to the troubleshooting part of the service manual. Such sections normally include block diagrams and fault-finding flowcharts for problems like no power, no charging, display, audio and RF faults. Technicians use them alongside the board layout to find the right test points and the components to measure. Check that the variant suffix matches your phone, since other J510 versions can differ in RF circuitry.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.