La-9413p Rev 1.0 Schematic !!link!! -
The Compal LA-9413P (VALA0) revision 1.0 schematic is a critical technical document for repairing the Dell Precision M2800 and Dell Latitude E5440 motherboards. It provides a detailed circuit map of components like the CPU power delivery, RAM slots, and interface controllers. Key Specifications & Resources
Device Compatibility: Primarily used in the Dell Precision M2800 (approx. 78 pages) and Dell Latitude E5440.
Technical Variance: Note that some available "LA-9413P" schematics are based on the similar LA-9411P. While nearly identical, the LA-9413P motherboard typically uses an eDP interface for the screen, whereas some reference schematics may show LVDS.
Official Maintenance: For physical disassembly or part replacement without needing the electrical circuit, refer to the Dell Latitude E5440 Owner's Manual. Common Troubleshooting Steps
When using this schematic for repairs, technicians often focus on these areas:
Power Rails: Check for the main B+ voltage and secondary rails (3.3V/5V ALW).
BIOS Chip: Locating the SPI Flash IC (often designated as U-something on the board) for reflashing if the laptop fails to POST.
Component Identification: The schematic helps identify specific Mosfets and ICs that may have shorted. Where to Find the Files
Laptop-Schematics: Offers the VALA0 LA-9413P Schematic for download/purchase.
ChinaFix: Provides the circuit diagram PDF for the Precision M2800 version.
NotebookSchematics: Lists related files including the LA-941 Boardview, which is essential for locating physical components on the PCB.
The Compal LA-9413P Rev 1.0 (often labeled as VALA0) is a motherboard used primarily in the Dell Latitude E6540 and Precision M2800 laptop series. While the specific Rev 1.0 schematic is often a paid resource on professional repair sites, it is technically nearly identical to the more common LA-9411P schematic. Motherboard Overview Manufacturer: Compal Electronics, Inc. Code Name: VALA0.
Key Processors: Intel Ivy Bridge or Sandy Bridge CPUs with HM77 chipsets. Memory Support: Dual-channel DDR3/DDR3L up to 1600MHz.
Graphics Options: integrated UMA or discrete AMD Mars XT/Sun Pro GPUs. Technical Differences Note
The main distinction between the LA-9413P and closely related models (like the LA-9411P) is often the display interface.
LA-9413P: Typically utilizes an eDP (embedded DisplayPort) interface.
LA-9411P (Alternative): Frequently uses an LVDS interface, though most other power rails and circuit designs remain the same. Availability and Sources
You can find circuit diagrams and boardview files through specialized repositories:
Laptop-Schematics: Offers the VALA0 LA-9413P schematic for download (typically for a fee).
NotebookSchematics: Provides a combined page for Latitude E6540 and Precision M2800 technical documentation.
Badcaps.net: Often hosts free community-uploaded schematics for related Compal boards like the LA-9591P. la-9413p rev 1.0 schematic
Are you troubleshooting a specific power issue or display problem on this motherboard? Dell Latitude E5430, Motherboard Schematic diagram
The LA-9413P Rev 1.0 schematic (often labeled as VALA0) is the technical blueprint for the motherboard used in the Dell Latitude E6540 and Dell Precision M2800 laptops. As a critical document for hardware technicians and enthusiasts, this schematic provides the exact wiring, component values, and power delivery architecture needed to diagnose and repair dead or malfunctioning motherboards. Motherboard Technical Specifications
The VALA0 LA-9413P board was introduced around 2013-2014 and is built on the Intel Haswell architecture. Key components detailed in the schematic include:
Processor: Supports Intel Core i3, i5, and i7 [4th Generation] (Socket rPGA-947). Chipset: Intel QM87 / Lynx Point.
Memory: Two slots supporting up to 16GB of DDR3L SDRAM (1600 MHz).
Graphics: Features a dedicated GPU, typically the AMD Radeon HD 8790M (Mars M2) with 2GB GDDR5 VRAM.
Display Interface: This specific motherboard uses an eDP (embedded DisplayPort) interface, though some schematic versions for similar models might reference older LVDS layouts. Embedded Controller (EC): MEC5075 and MEC5048 chips. Why You Need the Schematic
A schematic diagram is essential for complex repairs that go beyond simple parts replacement. For the LA-9413P, the schematic allows a technician to:
Trace Power Rails: Identify why the laptop isn't receiving power by checking the DC-in jack circuit and 3.3V/5V standby rails.
Identify Components: Find the exact specifications of burnt resistors or shorted capacitors that may not have visible markings.
Debug Display Issues: Troubleshoot no-backlight or no-video conditions by verifying signals on the eDP connector pins.
Analyze Power Sequencing: Follow the "Power Sequence Block Diagram" included in complete schematic packages to see exactly which chips must turn on before the CPU initializes. Go to product viewer dialog for this item.
Dell Latitude e6440 Laptop Motherboard LA-9931P Rev : 1.0(A00)
Dell Latitude e6440 Laptop Motherboard LA-9931P Rev : 1.0(A00) Dell Latitude E6540 VALA0 la-9411p Schematic - AliSaler.com
Based on the designation "LA-9413P Rev 1.0", this board is a Lenovo Laptop Motherboard (specifically associated with models like the Lenovo G50-80, G40-80, or Z50-70 series, typically featuring an Intel mainboard architecture).
Below is a professional BoardView Feature Profile and Technical Summary prepared for use with boardview software (such as FlexBV, OpenBoardView, or Landrex).
This profile organizes the critical components, signal nets, and test points required for diagnostic repair.
Fault 3: Short on +5VALW
- Schematic solution: Identify all components on the +5VALW rail using the "Power Plane" page. Use injection (1V, 2A) and trace which IC (USB hub, audio amp, or capacitor) heats up.
1. No power, no LED
- Check DC-in mosfets (PQ301/PQ302) – shorted or open.
- Measure +CHG_REG (typically 19V->5V/3.3V standby regulator).
- Replace PU301 (BQ24737) if no ACDET or ACOK.
Pages 10–15 (Power)
Look for "Power Tree" or "Power Sequence". Key pages:
- Page 12: Charging circuit (BQ24737 or SYX197).
- Page 15: CPU Core VR.
Fault 1: No Power / No LED
- Without schematic: Randomly test capacitors.
- With schematic: Follow +3VLP. Check pin 6 of PU101 (RT8232). If 0V, trace "ALW_ON" signal from EC pin 94. Replace EC or repair trace.
Conclusion
The LA-9413P Rev 1.0 schematic is a must-have tool for anyone repairing Lenovo G40/G50/Z50 series laptops. It demystifies the motherboard’s power delivery, charging circuit, and signal paths. Combined with a multimeter and oscilloscope, it transforms guesswork into logical, step-by-step motherboard repair.
Always match the exact revision – Rev 1.0, 1.1, or 2.0 – because power ICs and resistor values can change between revisions. The Compal LA-9413P (VALA0) revision 1
The LA-9413P Rev 1.0 schematic, for the Compal V5WE2 motherboard, is the key diagnostic document for repairing Acer Aspire V5-572 and V5-472 laptops. This document enables technicians to troubleshoot power issues and component failures by providing detailed mappings of voltage rails and IC sequences. For more detailed information on laptop schematics, you can visit specialised technician forums such as Badcaps.net or VinaFix.com.
and wondered where to start, you are looking at the right guide. That laptop runs on the legendary Compal LA-9413P motherboard .
When a laptop refuses to power on, has a short circuit, or drops its display, guessing won't fix it. You need a map. That map is the LA-9413P Rev 1.0 schematic.
Let’s break down how to read this specific document to bring a dead motherboard back to life. 🔍 The Core Architecture
is built around the Intel Haswell ULT (Ultra Low Terminal) processor family. This means the CPU and PCH (Platform Controller Hub) are integrated into a single chip.
The Good News: Fewer complex communication traces to fail between separated chips.
The Bad News: If a major power rail shorts out and kills the PCH side, you are usually replacing the entire integrated CPU processor. 🚦 The Big 3 Power Rails to Check
When a laptop is completely dead (no lights, no fan), your first job is to hunt down the primary power rails. Open up your PDF reader, search for these specific system rails, and test them with your multimeter:
+PWR_SRC (The 19V Rail): This is the main power line coming from your DC-in jack or the battery. If you don't have 19V running through the entry MOSFETs, nothing else will work. Check the input protection MOSFETs immediately after the DC jack.
+3VALW (3.3V Always-On): This rail powers the Super I/O chip and the BIOS. Without it, the power button cannot trigger the system to turn on.
+5VALW (5V Always-On): This usually runs alongside the 3.3V line and powers secondary wake systems and USB power states.
If you find a short to ground on any of these lines, use a bench power supply to inject a low voltage (like 1V) and feel around to see which capacitor or IC gets blazing hot. 🧠 Locating the Super I/O and BIOS
, the Super I/O (EC) controller is responsible for keyboard matrixing, fan control, and crucially, the power-on sequence.
Search tag: Look for the SMSC MEC1322 or similar chip designation in your schematic.
The Trigger: Check the pin labeled KBSWIC# or similar power button inputs. When you press the power button, this line should pull down from 3.3V to 0V. If it doesn't drop, your physical power button or its flat ribbon cable is broken. 💡 Pro-Tips for Successful Troubleshooting
Read the Block Diagram First: Always start on page 2 or 3 of the schematic. The block diagram shows you exactly how the CPU, RAM, display, and power ICs talk to each other. It saves you from getting lost in hundreds of pages of raw schematics.
Corrosion is a Beacon: If the laptop had a liquid spill, do not just clean it. Look at the corroded area, find the component labels on the board (like R210 or C345), and look them up in the schematic to see what voltage they were carrying.
Check the Coils: Coils (marked as PL on Compal boards) are the easiest places to measure voltage for different power states (RAM power, CPU core power, etc.). If a coil reads 0 ohms to ground, you have found your shorted circuit branch. Are you currently stuck on a specific power rail on the
? Tell me the component number or the symptom you are seeing, and we can map out the next diagnostic step together!
LA-9413P Rev 1.0 schematic belongs to the motherboard for the Dell Latitude E6540 Go to product viewer dialog for this item. Fault 3: Short on +5VALW
. It is a Compal design (VALA0) that shares nearly all circuitry with the more common Laptop schematic Key Technical Specifications Compal VALA0. Compatibility: Highly similar to the LA-9411P and LA-9412P. Major Interface Difference: The LA-9413P motherboard typically features an eDP (embedded DisplayPort) screen interface. Note for Technicians:
Many available LA-9413P schematics are actually repurposed LA-9411P diagrams which show an
interface instead. The rest of the board's power rails and logic are identical. Laptop schematic Critical Repair Resources Schematic and Boardview: You can find documentation at NotebookSchematics Laptop-Schematics BIOS & ME Region:
For "no power" or "slow boot" issues, technicians often use the Dr-Bios forums to request cleared ME Region BIOS files. Visual Aid:
A boardview (CAD format) is often available alongside the schematic to help locate components on the physical PCB. Laptop schematic Common Service Notes
Because this board is from the Dell Latitude E6540 series, it commonly faces high-heat scenarios due to the powerful Intel CPUs and optional dedicated graphics typical of this model. Using the LA-9411P schematic
for general power-rail troubleshooting (like 3V/5V standby or CPU VCore) is a standard industry practice when the native 9413P file is unavailable. Laptop schematic Are you troubleshooting a specific power rail or looking for a component location on this board?
Compal LA-9063P M/B Schematics | PDF | Office Equipment - Scribd 9 Jan 2013 —
LA-9413P Rev 1.0 (also known by the project name ) is a professional-grade motherboard schematic designed by Compal Electronics for the Dell Latitude E6540 business laptop
. This board is a centerpiece of the Haswell-era Dell Latitude lineup, engineered for high performance and durability Core System Architecture
The schematic reveals a robust platform built around fourth-generation Intel architecture and dedicated graphics: : Supports Intel Haswell processors (Socket rPGA947) paired with the Lynx Point : Features two slots for DDR3L SDRAM
(1.35V), supporting dual-channel configurations for professional multitasking : Equipped with a discrete AMD Mars M2 (Radeon HD 8790M) GPU with dedicated video memory Display Interface
: While some variations of this Compal design used LVDS, the LA-9413P specifically utilizes an eDP (embedded DisplayPort) interface for high-resolution internal panels Critical Subsystems for Technicians
For repair and diagnostic purposes, the LA-9413P schematic includes several essential functional blocks: Embedded Controller (EC) : Managed by the MEC5075 and MEC5048
chips, which handle power management, keyboard inputs, and thermal monitoring Power Sequence : The schematic includes a detailed Power Sequence Block Diagram
, which is vital for diagnosing "No Power" or "No Display" issues. It outlines the transition from the adapter input down to specific rails like 1.05V, 1.35V, 3.3V, and 5V Connectivity : Includes , multiple ports, and professional audio SMBus Diagram
: Outlines the communication paths between the chipset, battery, and various sensors Common Troubleshooting Points
Technicians frequently reference this schematic to address known issues with the Dell Latitude E6540: Power Rail Failures : Diagnosing the
power state transitions using the timing diagrams provided in the engineering documents GPU Issues
: Identifying power delivery faults in the discrete AMD graphics section AliExpress Keyboard Connector
: Addressing common keyboard failures by verifying the signal integrity of the EC to keyboard interface Availability & Reference