The board number is physically printed on the PCB, usually near the DDR4 slots or under the DC power jack.
The is more than a wiring diagram; it is a diagnostic roadmap for one of Dell's most complex mobile workstation platforms. Whether you are a professional repair technician, a data recovery specialist, or an advanced hobbyist, mastering this schematic will allow you to fix dead boards, short circuits, and power sequence failures with confidence. La-c781p Schematic
: The board typically uses a BQ24725A (often marked as BQ25A) charging IC. This IC is responsible for boosting the gate voltage of the entry N-channel MOSFETs to allow the 19V adapter power to pass into the main system rail (B+). The board number is physically printed on the