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| Rail Name | Voltage | Function | Key Component | | :--- | :--- | :--- | :--- | | | 19V | Adapter Input | PJ1 (DC Jack) / PF1 (Fuse) | | B+ | 19V | System Main Voltage | PQ301 / PQ302 (MOSFETs) | | 3VPCU / 3.3V | 3.3V | EC Standby Power | PU3 (RT8206 / BQ24xxx) | | 5VPCU / 5V | 5.0V | USB/Peripheral Standby | PU3 |
If voltage is missing after PQ102, the MOSFETs or the protection IC that drives them is faulty.
This board uses two SPI Flash chips (UH2 and UH6). If power rails are present but there is no display, a BIOS re-flash is often required.
Integrated into the processor package (System on Chip - SoC). Memory Support: Dual-channel DDR3L (1.35V) SO-DIMM slots. la-9413p rev 1.0 schematic
If you are tracking a missing power rail like +1.05VSP , search the PDF for that exact term to locate the specific step-down regulator page responsible for creating it.
The Compal LA-9413p (Rev 1.0) is a widely deployed laptop motherboard found in several mainstream Dell Inspiron and Latitude models, most notably the Dell Latitude 3440 and 3540 series. Repair technicians, system engineers, and hardware enthusiasts frequently rely on the official schematic diagram to diagnose complex board-level failures, trace power rails, and perform component-level troubleshooting.
: Lists related files including the LA-941 Boardview , which is essential for locating physical components on the PCB.
: Offers the VALA0 LA-9413P schematic for download (typically for a fee). To help you move forward with your content
If you find a short circuit on the B+ rail, do not inject 19V directly. Start at 1V with a current limit of 1A using a bench power supply. Feel the board or use a thermal camera to spot the component that heats up instantly (often a cracked ceramic decoupling capacitor).
Ultimate Guide to the Compal LA-9413P Rev 1.0 Schematic The Compal LA-9413P (often labeled as V5WE2) is a widely used laptop motherboard found across several Acer Aspire models, including the E1-570, E1-572, E1-532, and V5-572 series. Whether you are a professional microsoldering technician or a DIY repair enthusiast, having and understanding the schematic diagram for this specific board revision (Rev 1.0) is essential for diagnosing power issues, component failures, and no-display symptoms.
Known as the "VALA1" or "VALA0" platform, this board utilizes a 4th-generation Intel Haswell processor in an (often marketed as PGA94). It's paired with a Mobile Intel HM87 Express Chipset (PCH) and can be configured with either integrated Intel graphics or a dedicated AMD Radeon HD 8690M / 8790M / 6970M GPU.
: Features a discrete (DIS) GPU, typically the AMD Mars M2 (HD 8790M) with GDDR5 VRAM. Integrated into the processor package (System on Chip - SoC)
Based on hundreds of forum posts and repair logs, the LA‑9413P Rev 1.0 board has several recurring failure patterns. For each issue, the schematic provides the precise test points and component locations needed for troubleshooting.
Supports 4th Generation Intel Core (Haswell) processors, using the rPGA947 socket.
Symptom 3: Fan Spins, Lights On, but No Display (Black Screen)