PDF with diode mode measurements for the A30, presumably the Samsung Galaxy A30, though the name does not name the brand. Diode mode readings list expected values at connectors and test points, so a technician can compare a faulty phone against known-good numbers to spot shorted or open lines without powering the device. Measure with the multimeter red probe on ground as is usual for such charts. Results vary slightly between meters, so treat large deviations, not small ones, as faults.
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 @esquemaseletricos. 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.