La-e791p Rev 2.0 Schematic Diagram

La-e791p Rev 2.0 (also known as CSL50/CSL52) is a specialized motherboard schematic used primarily in

LA-E791P

First, let’s decode the nomenclature. is the motherboard codename assigned by Quanta Computer , one of the largest Original Design Manufacturers (ODMs) in the world. La-e791p Rev 2.0 Schematic Diagram

• CPU: AMD A6-9220 / A9-9420 (Stoney Ridge, FP4 socket, soldered).
• PCH (FCH): Integrated into the CPU package (AMD A68M FCH).
• Super I/O: ITE IT8987E (contains firmware & power sequence logic).
• EC/BIOS: Winbond 25Q64FWSIG (8MB).
• Power Management: Richtek RT8239B (main PWM), SY8288 (DDR), TPS51285 (LDOs).

standard AMD mobile sequence

The La-e791p follows a but with HP-specific SIO enabling. La-e791p Rev 2

1. Open the PDF. Search for "+3VALW" using Ctrl+F.
2. Find the Source. You land on the page with the 3V/5V regulator (likely a SY8286 or TPS51225).
3. Check Inputs. The diagram shows pin 12 is VIN (19V). Pin 8 is EN (Enable).
4. Probe physically: You find 19V on VIN, but 0V on EN.
5. Trace EN signal: The diagram shows EN comes from a resistor network labeled R391 and R392 tied to +5V_ALW.
6. The Ah-Ha moment: You have no +5V_ALW either. You move to the +5V generator.
7. Conclusion: The +5V PWM controller is dead. The schematic gave you the exact path.

RealSchematic

: A commercial source for the full boardview and circuit diagrams. CPU: AMD A6-9220 / A9-9420 (Stoney Ridge, FP4

Compal LA-E791P Rev 2.0

The (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