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Get StartedLooking for the LA‑D402P schematic? Here’s a concise post you can use for forums, social media, or a project page.
Title: LA‑D402P schematic — summary, common faults, and where to find it
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(also known as the Compal ) is a motherboard schematic specifically used in the Dell Latitude 3470 Latitude 3570
laptops. This board typically features an Intel Skylake-U processor and DDR3L memory. Laptop schematic Key Specifications & Resources Common Models : Primarily used in the Dell Latitude 3470 Go to product viewer dialog for this item. Dell Latitude 3570 Go to product viewer dialog for this item. Board Architecture : Based on the Wistron Loveland-SKL Compal LAL20 Major Components : Intel 6th Gen Skylake-U. : Supports up to 16GB DDR3L. : SMSC MEC1404-NU-GP. Repair Documentation : Full schematic packages for this board usually include: Step-by-Step Power Sequence block diagrams. Boardview files
(.cad or .brd formats) for tracing physical component locations. Voltage Rails and SMBUS block diagrams. Laptop schematic Diagnostic Tips
If you are using the schematic to troubleshoot power issues on this board: Check Power Adapter First
: Before assuming a motherboard failure, verify the DC jack and power adapter output. Disconnect Battery
: Always disconnect the internal battery before performing any board-level testing or repairs. Run On-Board Diagnostics : If the system still posts, you can hold the while powering on to enter Dell’s ePSA diagnostic mode to test memory and graphics. BIOS Access at startup to enter the BIOS Setup for hardware configuration. diagram or a file to locate a physical component?
REPORT: ANALYSIS OF THE LA-D402P SCHEMATIC AND HARDWARE PLATFORM
Date: October 26, 2023 Subject: Technical Overview and Schematic Analysis of the LA-D402P Mainboard la-d402p schematic
The LA-D402P is a mainstream motherboard designed primarily for HP 15-BS000 series laptops (including models like 15-BS010WM, 15-BS145dx, 15-BS079od). It is manufactured by Quanta (the ODM for HP), hence the "LA" prefix stands for Quanta.
The LA-D402P is a mobile-integrated motherboard design tailored for space and energy efficiency. While the lack of a public schematic complicates advanced repairs, understanding the board's architecture—specifically the use of Intel Gemini Lake SoC and PMIC power delivery—allows technicians to isolate faults effectively. The most common failures on this platform typically involve the PMIC power stages, BIOS corruption, or shorted capacitors on the secondary power rails.
Disclaimer: This report is based on technical analysis of available hardware data and general engineering principles applicable to the LA-D402P model series. All repairs should be conducted by qualified professionals.
The (Revision 1.0) is a motherboard manufactured by Compal specifically for the HP Spectre 13-V series, including models like the Spectre 13-v101ne. As one of HP's thinnest laptop lines, this motherboard features highly integrated components that make having a schematic essential for component-level repair. Core System Architecture
is built on an Intel platform, typically featuring 7th Generation "Kaby Lake" processors.
Processor (SoC): Features integrated Intel Core i5-7200U or i7-7500U CPUs (SR2ZV).
Memory: Typically comes with 8GB of onboard RAM, meaning the memory chips are soldered directly to the board and are not user-upgradable.
Graphics: Utilizes Intel HD Graphics integrated into the CPU.
Power Rails: Like most Compal designs (e.g., LA-4092P), the system relies on a sequence of voltage rails starting from the 19V primary input (B+) down to 3.3V/5V "Always-On" rails and various CPU/DDR power states. Why the Schematic is Critical
Because the Spectre 13-V is designed for extreme portability, the
board is densely packed. Repairing common issues like a "dead" laptop requires the schematic to:
Identify Test Points: Locating the exact points to measure the 19V input at the DC jack and throughout the board.
Power Sequencing: Understanding the role of the Super IO (SIO) IC, which manages the power switch signal and provides the initial 3.3V to the BIOS. Post: LA-D402P schematic — overview and resources Looking
Component Identification: Distinguishing between similar-looking SMD components like MOSFETs, Zener diodes, and ceramic capacitors. Common Faults & Troubleshooting
Based on standard Compal motherboard behavior, common failure points for the often include:
Short Circuits: Often caused by ceramic capacitors failing near high-heat areas like the CPU inductors.
SIO/BIOS Corruption: If the laptop has no power but the 19V rail is present, the SIO or the BIOS chip itself may be faulty.
DC Jack/Cable Failure: Physical wear on the DC jack cable can prevent the 19V rail from reaching the motherboard.
Heat Damage: Due to the thin chassis, integrated ICs like the audio control or charging controllers can overheat and short out. Finding Parts and Support
Replacement motherboards can be found through retailers like Amazon and eBay under part numbers such as 901719-601 or 903668-601. For official technical support, you can contact HP Expert Sales at 1-866-625-3906.
The LA-D402P schematic is a critical engineering document for technicians and engineers specializing in laptop repairs, particularly for high-end systems like the HP Spectre 13-v series. As a proprietary design from Compal Electronics, this schematic provides the foundational blueprint for the motherboard’s electrical architecture, power distribution, and signal paths. Technical Specifications & Core Components
The LA-D402P motherboard is engineered to support modern mobile computing standards, typically found in ultra-thin laptops. Based on engineering standards for similar Compal boards, it integrates:
Processor Support: Designed for Intel Skylake-U processors (6th Generation).
Memory Architecture: Supports DDR3L low-voltage memory modules.
Embedded Controller (EC): Often utilizes the SMSC MEC1404 for keyboard control and low-level power management.
Form Factor: Optimized for ultra-portable chassis, requiring dense component placement. Key Sections of the Schematic What it is: The LA‑D402P is a laptop
A complete schematic for the LA-D402P usually spans dozens of pages and includes:
System Block Diagram: Offers a high-level overview of how the CPU, PCH (Platform Controller Hub), and peripherals like the display and storage interact.
Power Tree & Sequence: Vital for troubleshooting "no power" issues. It details the step-by-step power-on sequence and the various voltage rails (e.g., +3V_PRIM, +5VS, +VCC_IN).
Connector Pinouts: Provides specific pin assignments for LCD/eDP panels, USB-C ports, and the battery interface.
Signal Description Tables: Lists the purpose of various control signals, which is essential for identifying failed logic gates or open circuits. Repair and Troubleshooting Applications
Technicians use the LA-D402P schematic alongside a BoardView file to perform precise diagnostics. Common repair scenarios include:
Power Rail Failures: Using the Power Distribution pages to locate where a voltage drop occurs between the DC-in jack and the CPU.
Component Identification: Finding the exact part numbers for surface-mount resistors or capacitors that may have burned out.
Signal Probing: Checking if the BIOS/PCH SMBUS communication is active when the laptop fails to POST. Where to Find Schematics
Because these are proprietary engineering drawings, they are not officially released to the public by Compal or HP. However, repair professionals often source them from specialized archives and communities:
Repair Databases: Sites like Laptop-Schematics.com and ChinaFix often host these files for a fee.
Community Forums: Technical groups on platforms like Telegram share confirmed and tested BIOS files and schematics to promote electronic waste reduction.