Full schematic for the Samsung Galaxy Grand Duos, model I9082, as a 2.18 MB PDF; the name labels it complete, while no board revision is indicated. These Samsung service diagrams show the power management IC, charging path, dual-SIM interface, display and audio circuits with net names and test points. Technicians use them to trace missing voltages, find a short on the battery line or identify a failed passive. Open in any PDF reader and verify the revision in the title block against the phone mainboard.
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.