PCB layout document for the Vivo Y91 handset, provided as a 215 KB PDF. A layout drawing shows the position of components on the board, which is useful for finding a capacitor, coil or test point once the schematic has identified the faulty net. Technicians use it together with the schematic to measure rails around the PMIC, charging IC and connectors. Open it in any PDF viewer, and check that the board in your phone matches the Y91 variant, as Vivo models with similar names can use different boards.
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_Diagram. 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.