HP Compaq CQ50 laptop schematic supplied as a PDF of about 1.07 MB. The name contains only the model, with no motherboard number, ODM or revision, so look for the board code in the drawing title blocks and compare it with the PCB. This model may have used more than one board design. With the sheets open in a PDF viewer, you can trace power rails from input to the CPU regulators, see what each section should measure, locate fuses and MOSFETs and work out why a board stays dead or shuts off.
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 @cyberlanelectonik. 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.