Schematic for the Samsung A500, supplied as a 1.44 MB PDF with a JahanIC tag in the name that marks the source collection. Circuit diagrams like this let a technician follow power rails from the battery connector and PMIC, trace charging, display and audio signals, and identify the components connected to a shorted line. Combine it with a component layout to find parts on the board. Open it in a PDF viewer with text search for reference designators, and check the PCB revision before measuring.
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 @Schematics_Mobile. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.