La-e791p Rev 2.0 Schematic Diagram Link

Before you press the power button, the motherboard must generate the standby voltages to power the Embedded Controller (EC) and the power button circuit.

Integrated Intel Core i3/i5/i7 U-Processor (Socket BGA1356, ultra-low power consumption).

These pages cover the buck converters. Look for the inductor labels: PL401 (+3V), PL402 (+5V), PL302 (GPU), PL201 (CPU). The rev 2.0 uses all ceramic capacitors with no through-hole caps, so micro-soldering is essential. La-e791p Rev 2.0 Schematic Diagram

Disclaimer: This guide is for educational and professional repair purposes only. The schematic files are proprietary to HP/Compal. Links provided lead to external repair forums and archives.

Upon receiving the power button signal, the system transitions from standby to an active state. The EC triggers secondary switches to turn on memory power ( +1.2V_DDR ), system agent power ( +1.0V_VCCIO ), and finally, the CPU core voltage ( +VCC_CORE / +VCC_GT ). 3. Common Failure Points on the LA-E791P Motherboard Before you press the power button, the motherboard

When troubleshooting a "No Power" or "No Display" symptom, a technician must trace the power sequence chronologically using the schematic. The LA-E791P converts the primary 19V input from the DC jack into several lower voltages using Step-Down Buck Regulators. The standard power rail progression is as follows: Step 1: Primary Input Protection ( +19V / VIN )

: Outlines the DDR4 SO-DIMM slots and interfaces for SATA 3.0 and PCIe (M.2) ports. Look for the inductor labels: PL401 (+3V), PL402

The LA-E791P relies heavily on the communication between the BIOS chip and the KB9022Q. If you have voltages but no boot, the schematic helps you verify the SPI bus signals (CS, CLK, Data) to ensure the firmware is being read. 4. Professional Repair Tips