La-9413p Rev 1.0 Schematic |top| May 2026
The LA-9413P Rev 1.0 (codenamed VALA0) is the schematic for the motherboard used in the Dell Latitude E6540 and Dell Precision M2800 laptops. This board is a "discrete" (DIS) version, meaning it includes a dedicated graphics chip rather than relying solely on integrated processor graphics. Core Technical Specifications
The schematic outlines a high-performance 4th Generation Intel architecture:
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. la-9413p rev 1.0 schematic
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!
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 LA-9413P Rev 1
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.
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. Short Example: Interpreting a Power Section
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
1. What is the LA-9413P Rev 1.0?
Pages 30–35 (I/O & EC)
The IT8586E pinout. Crucial for troubleshooting keyboard, fan, and power button issues.
What You Also Need: Boardview (.CAD or .BRD)
A schematic is difficult to use alone. You also need a boardview file (typically LA-9413P Rev 1.0.cad). Boardview software (OpenBoardView, BoardViewer) lets you click on a component like "PC401" and see its physical location on the motherboard. Pairing the schematic (what the signal does) with a boardview (where the part is) is the ultimate repair toolkit.
Short Example: Interpreting a Power Section
- PMIC Uxxx outputs labeled VCC_CORE, VCC_3V3, VCC_5V → check EN pins, input VIN, and any gate MOSFETs.
- Battery path: BAT+ → PMOS/FET → charge IC → fuel gauge IC → BATT_THERM to EC.
- Charging indicator LED often tied to charge-status pin on charger IC — useful to infer charging states.
4. Clock & Reset Generation
- Crystal Y1: 24MHz (Main Clock for PCH or Discrete GPU).
- Crystal Y2: 32.768kHz (RTC Clock for PCH/EC).
- CPU Reset:
PLT_RST#(All voltages must be stable before this goes high).- Test Point: Often located near the CPU socket or PCH edge.
1. No Power, No LED
- Measure VSYS (main power rail from adapter) – should be ~19V.
- Check +3VLP and +5VPCU – generated by PU401. If missing, check EN1 (pin 7) and VIN (pin 11–13).
- Replace faulty capacitors or PU401 if shorted.
