PCB layout document for the Xiaomi Redmi Note 8, with LLDM516 noted as a reference code in the name, provided as a 739 KB PDF. Layout drawings show where components, connectors and test points sit on each side of the board, complementing the schematic when you need to locate a capacitor, a coil or a failed IC physically. Open it in a PDF viewer and zoom in on the area of interest, and confirm your board revision matches the drawing.
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 @smart_repair_phone. Enginerys does not host this file.
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How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.