Open page 42 of LA-C781P. Locate PQ101 (AON6414). Measure voltage at Source (AC adapter input) – 19.5V present. At Drain (+PWR_SRC) – 0V. Result: Open MOSFET.
Pro Tip: Search for “LA-C781P boardview” as well. A boardview file (.brd, .cad, or .fz) shows component locations on the PCB, which complements the schematic.
The LA-C781P schematic is more than a PDF – it’s a technician’s X-ray vision into the Dell Precision 7510/7710 motherboard. Whether you’re troubleshooting a shorted capacitor, a missing power rail, or a dead GPU, learning to navigate this document will save hours of guesswork. La-c781p Schematic
Remember these golden rules:
By mastering the LA-C781P schematic, you elevate your laptop repair skills from component swapping to true logic-level diagnostics. Now go fix that dead Precision workstation! Open page 42 of LA-C781P
Before decoding the schematic, it’s critical to understand the hardware.
The LA-C781P is a complex, multilayer board with over 20 separate power rails (from +3VALW to +VCC_CORE), embedded controller (EC), BIOS IC, and multiple voltage regulators. The schematic provides a complete road map. Pro Tip: Search for “LA-C781P boardview” as well
Symptoms: Device Manager shows no wireless or Ethernet adapter.
Schematic Troubleshooting:
Gate of PQ101 is driven by PQ102 (BAT100). Schematic shows gate should be pulled low by charger IC’s ACDRV (pin 4). Measure ACDRV – 0V. BQ24780S is faulty.