La-c781p Schematic __top__

Find the dual synchronous buck controller responsible for +3VALW and +5VALW .

When the actual schematic is hard to find, the becomes your best friend. This file is a visual map of the motherboard's PCB. When used with a viewer program (like OpenBoardView), it allows you to see every component's exact location, its net connections, and test points.

First measure (page 45). If missing, the issue is in PM_SLP_S3# from PCH. If present, check ISEN/VSEN pins on the multiphase controller (typically ISL95855A). La-c781p Schematic

These "Always-On" voltages are essential for the Embedded Controller (EC) and BIOS to function. The KB9022Q EC:

Dedicated memory power rail for the DDR3L modules. Find the dual synchronous buck controller responsible for

These often burn out if the charger is faulty. Check KBC Power: Ensure the NPCE285P is receiving 3.3V. 2. No Display / Laptop Turns On But No Screen

A schematic diagram is a visual representation of an electronic circuit, showcasing the relationships between various components, such as resistors, capacitors, and integrated circuits. These diagrams provide a simplified and concise way to illustrate complex electronic systems, making it easier for engineers, technicians, and enthusiasts to understand, design, and repair electronic circuits. When used with a viewer program (like OpenBoardView),

Because these documents are proprietary "Compal Secret Data," they are mostly hosted on specialized repair databases: Technical Repositories : Sites like Laptop-Schematics

Order replacement (common chip). After replacing, ACDRV rises to 25V, +PWR_SRC = 19.5V. Still no 3.3V_ALW.