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Final recommendation: Download the actual La-e791p Rev 2.0 schematic and boardview from a repair forum. Use the above as your field guide to navigate it. If you need help reading a specific part of the schematic once you have it, describe the component or signal name, and I will interpret it for you.
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.
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
I’m unable to provide a full copyrighted schematic diagram (like the La-e791p Rev 2.0 from Compal/HP) in this response. However, I can give you a detailed guide to help you locate it and understand key power/connector details for troubleshooting.
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.
Ethical Note: These diagrams are copyrighted by Quanta. They are intended for repair technicians fixing broken hardware, not for mass counterfeiting. La-e791p Rev 2.0 Schematic Diagram
The LA-E791P Rev 2.0 uses a dual BIOS configuration (SPI Flash). The schematic details the connection between the PCH, EC, and the BIOS chip (usually Winbond W25Q256).
Unlike consumer block diagrams, the La-e791p Rev 2.0 schematic uses net labels and cross-references. Example:
Use a PDF viewer with search and layer toggling if available. Many repair communities provide boardviews (.BRD) alongside the schematic, allowing component location on the physical PCB.
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.
In the world of laptop motherboard repair, a schematic diagram is the closest thing to a treasure map. For technicians working on Dell’s popular mid-range lineup—specifically the Dell Vostro 5471 and Inspiron 5471—the LA-E791P Rev 2.0 Schematic Diagram is an indispensable tool.
This board, manufactured by Compal (the OEM behind many Dell boards), features the 8th Generation Intel Kaby Lake R (Whiskey Lake) platform. It is notorious for specific power delivery issues, BIOS corruption, and burnt MOSFETs. Whether you are facing a "no power," "no display," or "power cycling" fault, having the correct Rev 2.0 schematic is the difference between a successful repair and scrapping the board.
This article provides a deep dive into the LA-E791P Rev 2.0 board, its power sequence, common faults, and how to read the schematic effectively.
Symptom: Laptop boots to Windows but reboots when installing NVIDIA drivers, or stays black on external monitor. The Fix: The GPU core voltage may be unstable or the BIOS configuration lost.
This guide is for educational purposes. Repairing motherboards involves high-risk operations. The LA-E791P schematic is copyrighted material; ensure you have the right to access and use these documents for your repair work.
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. Final recommendation: Download the actual La-e791p Rev 2
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.
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 Where can you get the LA-E791P Rev 2
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
The motherboard is designed by Compal Electronics and supports the following core hardware configurations:
Processor (CPU): Intel Sky Lake-U or Kaby Lake-U series processors.
Graphics (GPU): Integrated Intel HD Graphics or dedicated AMD Radeon R17M with DDR3L VRAM. Memory: Dual-channel DDR4 SO-DIMM slots.
Storage Interfaces: Supports both SATA (HDD/SSD) and PCIe (M.2 NVMe) interfaces.
Power Management: Utilizes a multi-rail system, including critical power states like +VCC_CORE, +3VALW, and +5VALW. Key Schematic Sections
Block Diagram: An overview of how the CPU, PCH (Platform Controller Hub), and GPU interact with peripheral ports like USB, HDMI, and LAN.
Power Delivery Network (PDN): Detailed diagrams of voltage regulators (Buck converters) that step down the 19V adapter input to lower voltages like 1.2V (RAM) or 1.0V (CPU).
Signal Integrity: Pin-out definitions for the LVDS/EDP display connector, keyboard interface, and BIOS/EC (Embedded Controller) chips.
Security Notice: The document is marked as proprietary and confidential by Compal Electronics, containing trade secrets intended only for authorized service providers. Resources for Repair
If you are troubleshooting a "No Power" or "No Display" issue, these community-vetted resources can provide the specific Rev 2.0 files or guidance:
Downloads: Schematic and Boardview files are often hosted on enthusiast sites like GeekDais or The Tech Stall.
Troubleshooting Guides: Video walkthroughs on diagnosing specific rails like +VCC_CORE can be found on YouTube.
Community Support: Detailed discussions regarding BIOS dumps and power issues for this specific revision are active on the VLab forums. CSL50 LA-E791P Rev 2.0 Schematic | PDF - Scribd
