La-e791p Rev 2.0 Schematic Diagram New! ❲SIMPLE · 2024❳

The Compal LA-E791P Rev 2.0 (also known as CSL50/CSL52) is a motherboard schematic used primarily in HP 250 G6 and HP 15-BS series laptops. This document is an essential technical blueprint for hardware repair, detailing the power sequences, component layouts, and signal paths of the device. Technical Summary

Verify the Voltage Regulation Module (VRM) to see if CPU core voltages ( ) and GFX coil supplies are present. La-e791p Rev 2.0 Schematic Diagram

1. DC-in MOSFET short (PQ1/PQ2) – Often due to overvoltage from incorrect power adapter. Check VBUS sense resistor (10 mΩ).
2. Missing +3.3V_ALW – Caused by failed PL401 inductor or cracked PU401 (SY8288).
3. No display – Trace the +LCD_VDD enable signal from EC pin 94 to the LCD connector’s pin 28.
4. Power cycling – Look at +1.05V_PCH power-good signal (PCH_PG) tied to VRM_EN.

Failure A: No Power / Short on Main DC Jack (19V)

Symptom: The laptop is dead. No LEDs. The power supply clicks or goes into protection. The Fix: Using the schematic, locate the DC-In Mosfets (usually AO4407 or similar) and the Battery Charging IC (often BQ24780S). The Compal LA-E791P Rev 2