Troubleshooting chapter for the Samsung GT-S7580, the Galaxy Trend Plus, as a 3.13 MB PDF; TSHOO stands for troubleshooting, and the 7 is likely the chapter number within the Samsung service manual. Content of this type pairs common faults such as no power, no charge, no display or no signal with flowcharts, component locations and test points. Another copy of slightly different size exists, so compare both. Open in any PDF reader and verify 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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How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.