The adapter voltage passes through the input protection MOSFETs (first and second protection gates). The charging IC (often an Intersil/Renesas or Texas Instruments bq-series chip) checks if the voltage is stable and outputs an (AC Adapter OK) signal to the Embedded Controller. Step 2: Always-On Rails
Integrated Intel HD/UHD Graphics (some variations of this board layout may feature discrete NVIDIA GPUs, though the standard LA-E801P configuration relies primarily on the CPU's integrated graphics). 2. Power Architecture and Primary Power Rails
Check the high-side MOSFETs connected to the phase coils. If a high-side MOSFET shorts out, it can bypass the regulator and shoot 19V directly into low-voltage components, which often destroys the CPU. la-e801p rev 2.0 schematic
Intel Core i3/i5/i7 Processors (typically 6th or 7th Generation Skylake/Kaby Lake U-series). System Memory: Dual-channel DDR4 SODIMM slots.
Before proceeding, understand that using board-level schematics requires intermediate soldering skills (microsoldering) and knowledge of laptop power sequencing. Incorrect probing can short adjacent pins or damage the EC/BIOS. The adapter voltage passes through the input protection
Boardview software allows you to search for PR301 and highlights its exact location.
It also indicates which pin is Pin 1 on an IC, helping you avoid mistakes when probing with a multimeter. Sourcing Your Files Safely Intel Core i3/i5/i7 Processors (typically 6th or 7th
No. While many manufacturers use Compal-made boards, each brand's schematic is proprietary. A Dell LA-D801P board is completely different from an HP LA-E801P board. Using the wrong schematic will lead you to incorrect diagnostic conclusions. Always ensure the schematic matches the specific motherboard model and revision for the laptop you are repairing.
Any help or guidance would be greatly appreciated.
Diagnosing a dead LA-E801P board requires tracing the power distribution from the DC jack down to the low-voltage logic gates. The schematic divides these into specific states: (Mechanical Off), S5 (Soft Off), S3 (Sleep), and S0 (Fully Operational).
[DC-IN / Battery] ──> [+19V / +PWRSRC] ──> [+3VALW / +5VALW] ──> [+1.0V / +1.2V / +1.8V] ──> [VCC_CORE] Main System Rails