Schematic Portable | Apw70 Lac391p
The APW70 is a multi-channel power supply controller and sequencer. Its primary job is to manage the startup and shutdown order of different voltage rails in a portable system (e.g., +3.3V, +5V, +1.8V, Vcore). If the APW70 fails, the entire device will exhibit a “dead” state—no LEDs, no fan, no response.
Key features of APW70:
APW70 LAC391P Schematic — Portable Repair & Reference Guide
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The LAC391P acts as the heavy lifter. While the APW70 handles logic and sequencing, the LAC391P drives external MOSFETs to generate the high-current main rails (often the 3.3V and 5V standby rails). It is a constant-on-time, synchronous buck controller.
Key features of LAC391P:
Why “Portable” Matters: The schematic labeled “portable” will include battery charging circuitry (often a separate IC like BQ247xx) and power-path management, which interfaces directly with the APW70. A desktop or non-portable schematic would omit battery management.
If your device is medical or military (some LAC391P variants appear in old portable patient monitors), the schematic may be restricted. In that case, contact the original manufacturer with your service credentials.
The APW70 LA-C391P is the proprietary motherboard for the HP ZBook 17 G3 Mobile Workstation. Technicians and repair enthusiasts often seek its schematic and boardview files to diagnose common power-related faults, such as "no power," "no display," or charging failures. Motherboard Overview: LA-C391P
Manufactured by Compal (indicated by the "LA" prefix), this board is designed for high-performance mobile workstations.
Key CPU Support: Typically supports 6th Generation Intel Core (Skylake) or Xeon processors. apw70 lac391p schematic portable
Expansion & Connectivity: Features multiple RAM slots, dedicated GPU options, and specialized power management circuitry to handle workstation-grade power loads.
Common Versions: You may find revisions like REV 1B or REV 1C. Understanding the Schematic and Power Rails
A schematic for the LA-C391P is essential for tracing electrical signals and measuring voltage at various test points.
The (also known as the ) is a professional-grade motherboard manufactured by Compal Electronics for the HP ZBook 17 G3 Mobile Workstation. Core Technical Specifications As a motherboard for a high-end mobile workstation, the is designed to support high-performance components:
Processor Support: Built for 6th Gen Intel Core (Skylake) and Xeon processors. The APW70 is a multi-channel power supply controller
Memory: Features multiple DDR4 RAM slots, typically supporting up to 64GB of ECC or non-ECC memory depending on the CPU configuration.
Graphics: Uses a modular MXM (Mobile PCI Express Module) slot, allowing for swappable high-end NVIDIA Quadro or AMD FirePro workstation-class GPUs.
Storage Interfaces: Includes support for multiple M.2 NVMe SSDs and SATA drives for extensive RAID configurations. Schematic Breakdown
The LA-C391P schematic is a complex engineering document that details the electrical pathways and logic of the board. Key sections include: Laptop Motherboard Block Diagram - Scribd
Check the board for other markings: