Troubleshooting guide in PDF format, 1.65 MB, for model S7262, which corresponds to a Samsung Galaxy Star Plus dual-SIM handset, though no brand is given in the name. Tshoo is Samsung shorthand for troubleshooting, and these sections usually provide flowcharts for faults such as no power, no charging, no display, no sound or SIM errors, with reference to test points and key parts. Use it alongside the main schematic and check the model on the device before following the steps.
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 @mobile_jump2. 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.