Compressed schematic set for model A135F, a code matching Samsung's SM-A135F numbering, with the .M ending suggesting main board documentation; at 1.56 MB it likely holds several diagram sheets. No revision is stated in the name. Unpack the zip and open the pages in a PDF viewer to trace supply lines from the battery connector and PMIC, locate charging ICs and inspect USB, display and SIM circuitry. Confirm the board printing matches your unit, as later production revisions can move or change components.
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 @phoneSchematics. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.