Schematic of the small sub-board for the Redmi K40 Pro smartphone, a 100 KB PDF. The small board in phones usually carries the USB charging port, microphone and related connectors, so this diagram helps trace charging lines, data signals and flex connections when a phone will not charge or detect USB. Open it in any PDF viewer and pair it with the matching location map to find parts physically. Check that the board marking on the phone matches before using the values.
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 @schematic_mobile5. 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.