La-e791p Rev 2.0 Schematic Diagram //free\\ 〈EXTENDED〉

The LA-E791P Rev 2.0 (also known as the Compal CSL50) is a motherboard commonly found in HP 15-BS series and HP 250 G6 laptops. This schematic is essential for diagnosing power-related issues, "no display" scenarios, and charging faults. Schematic Overview & Components

The LA-E791P Rev 2.0 architecture is based on the Intel Sky Lake-U platform and includes the following key features: Processor (CPU): Integrated Intel Sky Lake-U SoC.

Graphics (GPU): Discrete AMD R17M GPU with dedicated DDR3L VRAM.

System Memory: Supports DDR4 SO-DIMM across two channels (A and B).

I/O Interfaces: Includes SATA for storage, PCIe slots, HDMI connectivity, and a keyboard interface.

Embedded Controller (EC): Manages power sequences and thermal systems. Troubleshooting & Repair Guide

Common troubleshooting steps for the LA-E791P Rev 2.0 motherboard involve verifying critical voltage rails:

Primary Power Check: Verify the main +19V supply from the adapter.

Always-On Rails: Check for +3.3V_ALW and +5V_ALW power rails, which are necessary for the laptop to start. Power Sequence:

Inspect the EC Board Control signals to ensure the power-on signal is being sent.

Verify the Voltage Regulation Module (VRM) to see if CPU core voltages ( ) and GFX coil supplies are present.

No Display Issues: If the laptop powers on but has no display, focus on the SOC (System on Chip) and GFX coils. If the GFX coil supply is missing, it often points to a failure in the communication between the SOC and power management ICs. La-e791p Rev 2.0 Schematic Diagram

BIOS & EC Firmware: Ensure the BIOS (Main + EC) is functional, as corrupted firmware can prevent the motherboard from initializing. Resources & Downloads

You can find the full schematic and boardview files through the following technical repositories:

Scribd: Offers detailed LA-E791P Rev 2.0 Overviews and Full Schematics.

NotebookSchematics: Provides Schematic and Silkscreen packages specifically for the HP 250 G6 and 15-BS series.

Geekdais: A source for downloading Mainboard Schematic PDF files for revision 2.0.

The Tech Stall: Useful for obtaining the BoardView (.BV) file, which is critical for locating physical components on the PCB.

Are you currently troubleshooting a specific fault, such as no power or no display, on this motherboard? CSL50 LA-E791P Rev 2.0 Schematic | PDF - Scribd

The LA-E791P Rev 2.0 is a motherboard schematic specifically for the HP 15-bs series laptops, such as the HP 15-bs526ur. Developed by Compal Electronics (code-named CSL50/CSL52), this board is often a subject of "repair stories" in the tech community because it represents a common challenge in budget laptop engineering.  The "No Display" Mystery 

The most frequent story surrounding this schematic involves the laptop powering on but showing no display. Technicians often use the Rev 2.0 schematic to trace a specific signal failure: EC_RSMRST#. This signal is a critical "handshake" between the Embedded Controller (EC) and the Southbridge; if it doesn't trigger, the CPU never wakes up, leaving the user with a glowing power button but a black screen.  Common Repair Themes 

Voltage Rails: Repairs often focus on the +VCC_CORE rail. Without the schematic, it is nearly impossible to identify which of the tiny MOSFETs or capacitors has shorted out, preventing the CPU from getting power.

BIOS Corruption: Many "solid stories" end with a BIOS reflash. The Rev 2.0 board often requires both a Main BIOS and an EC (Super I/O) firmware update to fix "dead" or "looping" power states. The LA-E791P Rev 2

Hardware Resilience: While it's a consumer-grade board, it is described by some as "fairly resilient" once small SMD (Surface Mount Device) shorts are cleared.  Where to Find the Schematic 

If you're looking to troubleshoot your own unit, these schematics are primarily hosted on dedicated repair databases: 

AliSaler: Provides BIOS and EC firmware dumps alongside schematic references.

Scribd: Hosts PDF overviews of the Compal CSL50 engineering drawings.

RealSchematic: A commercial source for the full boardview and circuit diagrams. 

Are you currently troubleshooting a power issue or a display problem with this specific board?  CSL50 LA-E791P Rev 2.0 Schematic | PDF - Scribd

LA-E791P Rev 2.0 , also known as the motherboard, is a proprietary laptop system board manufactured by Compal Electronics. It is commonly found in budget to mid-range laptops, such as models from the Technical Architecture Overview

The schematic outlines the intricate hardware mapping and power sequencing required for these devices. Processor & Core Logic

: The board typically supports AMD processors (Bristol Ridge or Stoney Ridge architectures) and integrates the System on Chip (SoC) design where the CPU, GPU, and Southbridge functions are combined. Power Rail Distribution : The primary power supply for the CPU/SoC. DDR4 RAM Support : Maps the 1.2V memory power rails. Standby Rails

: Includes standard 3.3V and 5V power states necessary for the board to initiate the boot process. Input/Output Interface : The schematic details the connections for: SATA and M.2 storage interfaces. LCD display via eDP (Embedded DisplayPort). Peripheral ports like USB 3.0, HDMI, and Ethernet. Common Diagnostics & Issues

Technicians frequently use this schematic to troubleshoot "No Power" or "No Display" conditions. No +VCC_CORE If you're looking for the "La-e791p Rev 2

: A common failure point where the motherboard receives power but fails to provide the critical core voltage to the processor, often leading to a "No Display" symptom. Charging Circuitry

: The board uses a dedicated battery charging IC (often from Intersil or Richtek) to manage the power transition between the AC adapter and the internal battery. Documentation Resources

You can find full engineering drawings and boardviews on technical archives for repair purposes: : High-level LA-E791P Schematic Overview CSL50 Detailed Diagrams Telegram Archives : Technicians often share schematic and boardview files in .rar format for granular circuit tracking. Repair Communities : Groups like the Facebook Laptop BIOS community

provide peer support for specific instruction sets and component identification. or a particular error code you're seeing on this board? CSL50 LA-E791P Rev 2.0 Schematic | PDF - Scribd

1. Repair and Troubleshooting: Technicians can use these diagrams to identify faulty components or connections, making it easier to repair the device.
2. Upgrades and Modifications: For those looking to upgrade or modify their hardware, a schematic diagram provides a roadmap of how components are interconnected, helping to avoid potential issues.
3. Learning and Education: For students and electronics enthusiasts, studying schematic diagrams can be a valuable learning experience, offering insights into how complex electronic devices are designed and constructed.

If you're looking for the "La-e791p Rev 2.0 Schematic Diagram," here are a few suggestions on where to find it:

7. Debug Flowchart (Schematic-Based)

Start: No power
    ↓
Measure +3VLP at JP1 pin 1 → No → Check DC-in circuit (page 5)
    ↓ Yes
Measure +3V_ALW → No → Check PU402, EN signal from SIO (page 28)
    ↓ Yes
Measure EC_PWRBTN# toggle when pressing power button → No → Replace SIO or check button (page 8)
    ↓ Yes
Check PM_PWRBTN# to CPU → No → Broken trace from SIO to CPU (page 26)
    ↓ Yes
Check VR_READY (should go high after Vcore) → No → Replace RT8239B or MOSFETs (page 30)
    ↓ Yes
Check ALL_SYS_PWRGD → No → Check +1.2V_DDR, +1.8VS, +0.675VS (page 15)
    ↓ Yes
Check SIO_PWRGD → No → SIO firmware corrupted → Reflash EC BIOS
    ↓ Yes
Display & boot

Practical Use Case: Tracing a "No Power" Condition

Using the schematic, a technician would:

1. Check +VIN at DC-in jack → Page 2.
2. Verify AC_IN# is low (active) → Page 3.
3. Measure +3.3V_ALW on inductor PL401 → Page 5.
4. Check EC_ON signal from EC → Page 18.
5. Confirm PCH_RSMRST# → Page 14.

Without the Rev 2.0 schematic, step 4’s voltage threshold (1.8V for enable vs 3.3V for logic) would be unknown—leading to misdiagnosis.

D. Short on +19V rail (DC_IN)

• Common culprit: PC401 (capacitor near DC jack) or PQ7/PQ8 (protection MOSFETs).
• Schematic section: Page 5 (Input power isolation).
• Fix: Inject 1V @ 3A on +19V rail; thermal camera shows hot spot.

6. Legal and Ethical Access

Where can you get the LA-E791P Rev 2.0 Schematic Diagram?

Warning: Do not pay for scam "instant download" websites. Most are phishing attempts.

• Repair Communities: Vinafix, Badcaps, and Reparatur. These require a free account but offer verified files.
• Paid Repositories: SchemeNet or syx (Shenzhen). Professionals pay for these because they are guaranteed correct.
• Donor Boards: If you have a physically damaged board, you can reverse engineer it, but this is time-consuming.

Ethical Note: These diagrams are copyrighted by Quanta. They are intended for repair technicians fixing broken hardware, not for mass counterfeiting.