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.
No. LA-C761P is for Dell Precision 5510/5520 (different form factor, different GPU power delivery). Always verify the exact number on the board. La-c781p Schematic
The LA‑C781P is an AC/DC power supply / adapter board (model designation suggests a switch‑mode power module). This report summarizes typical schematic features, pin functions, common failure points, and troubleshooting steps for repair and testing. (If you need the exact manufacturer schematic file, provide the device context or a photo of the board.) Open page 42 of LA-C781P
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. Pro Tip: Search for “LA-C781P boardview” as well
Order replacement (common chip). After replacing, ACDRV rises to 25V, +PWR_SRC = 19.5V. Still no 3.3V_ALW.