La-e801p Rev 2.0 Schematic Verified Jun 2026

[DC Jack / Adapter (19.5V)] │ ▼ [First/Second Input MOSFETs (PQA1 / PQB12)] ───► Verifies EC Protection Active │ ▼ [System Main Common Rail (+19V / +B)] │ ├──────────────────────────────┐ ▼ ▼ [3.3V Always-On (+3VALW)] [5V Always-On (+5VALW)] │ │ ▼ ▼ [Power Button Trigger] [S3/S0 Working States] │ │ ▼ ▼ [RAM Power (+1.2V)] [CPU Core Power (+VCC_CORE)] 1. Main Charging & Input Stage (+B / +19V)

19.5V enters through the DC-in connector and encounters the reverse-polarity and over-voltage protection MOSFETs (typically PQ1 and PQ2).

The Compal LA-E801P (often paired with board model DLF31) is a widely deployed laptop motherboard found in several budget and mid-range Dell Inspiron and Vostro models. Engineers, technicians, and board-level repair hobbyists rely heavily on the LA-E801P Rev 2.0 schematic to diagnose power failures, liquid damage, and no-display symptoms. la-e801p rev 2.0 schematic

Because these are proprietary documents, they are rarely hosted on official Dell or Compal websites. Most technicians find them through:

Troubleshooting a dead or shorted LA-E801P board requires mapping out the fundamental power rails. These voltages must be generated in a specific sequence for the laptop to post. Power Rail Nominal Voltage Purpose / Target Area Primary input from the DC jack before protection MOSFETs. +PWR_SRC Main system power bus distributed to all buck controllers. +3VALW [DC Jack / Adapter (19

When you open the LA-E801P Rev 2.0 PDF, you should focus on these critical power rails and stages: 1. The DC-In and Charging Circuit

: Finding the exact values of burnt resistors or capacitors (e.g., "RC12" or "CC5"). These voltages must be generated in a specific

Based on hundreds of repair logs, here are fixes you can perform using this document:

Dedicated GPU power rail, active only when the discrete graphics chip is demanded by the operating system. Common Failure Modes on the LA-E801P

Based on technician feedback, several areas frequently require a deep dive into the Rev 2.0 diagrams:

Vital for reflashing the BIOS chip or rewriting the KB9022Q internal microcode if the EC gets corrupted.