Schematic for Dell Compal board LA-M891P, the DIS variant, meaning the discrete graphics version of the design, as a 3.72 MB PDF. It lets a technician trace power rails, sequencing signals, GPU power stages and connector pinouts when hunting no-power or no-display faults. Boards built in UMA and discrete versions can differ in populated parts, so confirm your unit has the dedicated GPU. Also match the LA number and revision on the PCB, and use the companion boardview to locate parts.
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 @cynetitsolution. 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.