Schematic Portable — Apw70 Lac391p

The typically refers to the Compal LA-C391P motherboard, commonly found in high-performance laptops like the HP ZBook 17 G3 . This board is a complex, multi-layer PCB designed to handle high-wattage mobile workstations. ⚙️ Core Technical Specifications Motherboard Model: Compal LA-C391P (often labeled APW70).

Always copy and paste net names (e.g., SUSP# , PM_SLP_S3# ) into your PDF reader’s search tool to track down which component is suppressing a signal.

You're looking for information on the APW70 LAC391P schematic, specifically in a portable context.

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Locate the page labeled "Power Block Diagram" to identify which PWM chip creates which voltage rail, along with their respective component designators (e.g., PU401, PU402).

: The schematic defines the critical power-on sequence, from the primary DC-in voltage through the +3.3V/+5V always-on rails to the CPU VCore. Embedded Controller (EC) : Typically utilizes the MEC1416-NU

: Includes detailed diagrams for USB Type-C power delivery, HDMI 1.4, and the SMBus block for battery communication. Laptop schematic Common Troubleshooting Points The typically refers to the Compal LA-C391P motherboard,

Before pressing the power button, the Always-On controller (typically powered by a PWM chip like the RT8243 or similar) must generate the system's baseline voltages:

: Always-on voltage rails generated immediately after plugging in power. These run the Embedded Controller (EC) and standby circuits.

The fault lies in the entry protection circuitry. Check the first and second input MOSFETs for gate voltage saturation. Always copy and paste net names (e

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Users attempting component-level repairs on this board have noted difficulty in finding reliable schematics and boardviews to trace damaged Integrated Circuits (ICs).

The first stage of the schematic is the most robust. The Lac391p features a comprehensive input filtering section. The schematic shows a standard arrangement of: