Lad402p Schematic Top -
The most likely correct technical designation for this board is the , often paired with the alternative part number LA-M401P . A crucial first step in any hardware repair is correctly identifying the motherboard model, as using mismatched schematics can be misleading.
Manages the high-wattage USB-C Power Delivery (PD) inputs common to the XPS line. Why You Need the Schematic and BoardView
To fully execute repairs using the LA-D402P schematic, a diagnostic bench should ideally be equipped with specialized hardware:
The top-level hierarchy of the LA-L402P schematic map defines how primary computing engines communicate over high-speed buses. The system centers around a unified processing and memory ecosystem tailored for high-density mobile platforms:
When troubleshooting or debugging the LAD402P, refer to the schematic diagram to: lad402p schematic top
Set multimeter to resistance mode. Test the large system inductors (3.3V, 5V, CPU core, and RAM rails) relative to system ground. Low ohms indicates a shorted capacitor or IC on that rail. Verify the +19V main line passes the safety MOSFETs.
If a specific USB port is dead, the schematic shows which controller manages that port, allowing for targeted troubleshooting.
: Centrally located, often surrounded by large inductors (coils) and MOSFETs that form the CPU Core Power (+CPU_CORE) .
When analyzing the top layer of the LA-D402P schematic, several key functional modules dictate how power and data flow across the printed circuit board (PCB): The most likely correct technical designation for this
Ensure the charging IC is pulling down or lifting the gates of PQ1 and PQ2 to allow voltage through. If the gates read 0V, the charging IC is likely in protection mode due to a short circuit down the line.
For a , you could pick R2 = 3.3 kΩ , R3 = 1 kΩ :
The (often searched as LAD402P ) refers to a sophisticated high-end laptop motherboard manufactured by Compal, specifically used in the Dell XPS 15 9520 and Dell Precision 5570 . Accessing the schematic top and BoardView files is the first step for any technician looking to perform component-level repairs on these premium machines. Understanding the LA-L402P Architecture
: Typically two DDR4 slots. The nearby schematic labels often include +1.2V or +1.5V power rails. Why You Need the Schematic and BoardView To
To help narrow down your repair or design review, are you analyzing a on this board (such as no power, missing video, or charging failure)? If you have a specific component or circuit net name you are trying to locate, please share it. Share public link
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The LAD402P’s internal MOSFET will start limiting current once the sense voltage across R5 (or the internal sense) reaches its set point (≈0.4 V). This translates to roughly 2 A of load current. Adding an external sense resistor lets you tune the limit down if you need to protect downstream components.
The (often designated as LA-D402P ) is a highly popular laptop motherboard manufactured by Compal. It is widely used in mainstream Dell Inspiron and Vostro series laptops (such as the Dell Inspiron 15-3567 and 14-3467).