Touchscreen circuit pages from the Samsung SM-A11 schematic, delivered as a PDF of 4.33 MB. They show the display and touch connector pinout, the touch controller supply voltages and the interface and interrupt lines toward the processor. A technician uses this to diagnose dead or ghost touch problems by checking the supply rails, filter components and connector pins for opens or shorts. Any standard PDF viewer opens the document; verify the PCB revision before relying on component locations and designators.
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 .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.