Archive with service material for the Quanta U99 mainboard, revision 1A, fitted to an HP Pavilion 15 notebook. At 1.49 MB the RAR package likely carries the full schematic, which a technician uses to locate the power-on sequence, check standby rails, find the EC and BIOS chip and trace signals around a shorted MOSFET or capacitor. HP sources many Pavilion boards from Quanta, whose project codes appear on the PCB silkscreen. Because the Pavilion 15 name covers many different boards, match the U99 code and revision on your board before using these pages.
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 @IT_SERVICE_WORLD. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.