Lae791p Rev 20 Schematic Diagram Verified Patched May 2026

LA-E791P Rev 2.0 schematic diagram (also known by the Compal project name

) is a technical document for the motherboard used in laptops like the

This schematic is widely sought for repairs involving power rail issues (such as

) or component identification. Below are the details and verified sources for accessing this specific revision: Motherboard Specifications (Rev 2.0)

The LA-E791P Rev 2.0 motherboard typically includes the following core hardware: Intel Sky Lake-U (integrated SOC). AMD R17M (Discrete Graphics) with DDR3L VRAM. Support for DDR4 SO-DIMM memory. Connections for SATA and PCIe devices. Verified Download Sources

While these documents are proprietary to Compal Electronics, they are frequently hosted on technician forums and document sharing sites: A complete PDF of the CSL50 LA-E791P Rev 2.0 Schematic

is available, though it may require a subscription or account to download. NotebookSchematics: This site often lists LA-E791P boardviews and schematics for professional repair use. Provides specific files for Rev 2.0 BID 08328

, including BIOS and EC firmware which are often needed alongside the schematic for full repairs. Repair Context

Common issues associated with this board revision include "No Display" scenarios caused by SOC or power management problems. If you are troubleshooting a dead board, focus your search on the Power Sequence

page within the schematic to verify if the main rails (3.3V, 5V, and VCC) are initializing correctly. measurement or trying to identify a burnt component on the board? CSL50 LA-E791P Rev 2.0 Schematic | PDF - Scribd

LA-E791P Rev 2.0 is more than just a series of traces on a fiberglass board; it is the "heart" of the

series laptops. To a technician, this verified schematic is the map to a treasure hunt. The Story of the

Imagine a laptop that has gone completely dark. No lights, no fan, no life. The owner is a student whose entire thesis is locked inside. Most shops would call it a "dead board" and suggest a total replacement, but for a technician with the LA-E791P Rev 2.0 schematic , the story is just beginning. The Entry Point

: The technician starts at the DC-in jack. Using the schematic from sources like , they trace the 19V rail as it enters the board. The Silent Saboteur

: The schematic reveals a complex power management system. In this story, a tiny, microscopic capacitor near the Sky Lake-U CPU

has shorted to ground. Without the diagram, finding this single component among thousands would be impossible. The Critical Handshake : The diagram shows how the EC (Embedded Controller)

must "talk" to the BIOS chip to allow the power-on sequence. The technician sees that a signal is missing—a single line on page 42 of the schematic isn't pulling high. The Resurrection lae791p rev 20 schematic diagram verified

: With a single drop of solder and a replacement component identified by its exact part number in the schematic, the connection is restored. The technician presses the power button, the fan spins, and the HP logo flickers back to life. Technical Identity Common Chassis : HP 250 G6, HP 15-BS series. Core Architecture

: Supports 6th, 7th, and 8th Gen Intel Core processors (i3/i5/i7). Key Features

: Includes DDR4 SO-DIMM slots, SATA/PCIe interfaces, and often an integrated AMD R17M GPU in specific configurations. Reliability

is a Compal motherboard (also known as CSL50/CSL52) primarily used in series and

laptops. While full text schematic diagrams are generally proprietary, verified technical overviews and resources for Revision 2.0 of this board highlight its key power rails and components. Alibaba.com Core Component Specifications (Rev 2.0) Processor Support

: Integrates 6th or 7th Gen Intel Core (Skylake/Kaby Lake) or Intel Celeron/Pentium processors. : Two DDR4 RAM slots.

: May feature UMA (integrated) or discrete AMD/Radeon graphics depending on the specific model variation.

: Often a Winbond 25Q64 or 25R128 (128M-bit) serial flash memory. Critical Power Rails & Troubleshooting Points Diagnostic videos and verified reports for LA-E791P Rev 2.0 often reference these specific areas for repair:

: Central power rail for the SOC/CPU; failure here often causes "no display" issues. 3V/5V Standby

: Common failure point where the laptop has no power; standard troubleshooting involves checking the CSL50/CSL52 standby IC. DC-In Protection

: Controlled by MOSFETs near the power connector; a "short circuit" in this area is a frequent cause of dead boards. Verified Schematic Resources You can find downloadable PDF versions of the LA-E791P Rev 2.0 schematic and boardview through these platforms: : Provides a 43-page CSL50 LA-E791P Rev 2.0 Schematic YouTube Community Guides : Many repair channels, such as ERBA Electronics

, offer step-by-step schematic analysis for this specific motherboard. Repair Communities : Platforms like

host verified BIOS dumps and schematic files for this revision. Are you troubleshooting a specific issue like a "no power" state or "no display" on this board?

The LA-E791P Rev 2.0 schematic is a critical technical document used for repairing HP 15-BS series and HP 250 G6 laptops. It details the internal hardware architecture for the CSL50/CSL52 motherboard, primarily built around the Intel Sky Lake-U platform. Technical Specifications Motherboard Model: CSL50 / CSL52 (Compal LA-E791P)

Revision: 2.0 (often backwards compatible with 1.0 troubleshooting) Primary Processor: Intel Sky Lake-U (Integrated SOC) Supported Devices: HP 15-BS525UR, HP 15-BS526UR, HP 250 G6 Key Components: Dual-channel DDR4 memory architecture Integrated Power Management IC (PMIC) Realtek Audio & LAN controllers HDMI and SATA interface logic Core Circuit Sections

The verified schematic provides specific pinouts and voltage requirements for diagnosing common failure points: LA-E791P Rev 2

⚡ Power Management: Includes the +3V/+5V always-on rails, which are frequent sources of "no power" issues.

🔋 Battery Charging: Details the charging circuit path from the DC jack to the battery connector.

🖥️ Display Logic: Pin assignments for the eDP (Embedded DisplayPort) connector, essential for fixing backlight or "no display" problems.

🧠 SOC (System on Chip): Critical signal descriptions for the Intel processor, including the VCC_CORE power rail. Verified Resources

You can find the verified PDF and BIOS files on specialized repair portals: Full Schematic PDF: Available on Scribd and GeekDais.

BIOS & EC Dumps: Verified firmware for this revision is hosted on Bios-Dump.

Boardview Files: Essential for locating physical components on the PCB, found at The Tech Stall.

💡 Note: Always verify your specific board revision (Rev 1.0 vs Rev 2.0) before flashing BIOS or measuring test points, as small component changes can exist between versions.

If you are currently troubleshooting a specific issue, I can help you locate the test points or voltages for: A laptop that won't turn on (+3VALW / +5VALW rails) A laptop with no display (+VCC_CORE or BL ON signals) Charging issues (ACOK and charging MOSFETs) Which area should we focus on?

The LA-E791P Rev 2.0 is a motherboard manufactured by Compal Electronics (codenamed CSL50/CSL52) primarily used in the HP 250 G6 and HP 15-BS laptop series. The "verified" status in technical circles refers to schematics and boardview files that have been cross-checked by technicians for accuracy in pin assignments and voltage rail behavior. Technical Overview & Specifications

The Rev 2.0 schematic details a complex Sky Lake-U system architecture designed for mid-range mobile performance.

Processor Support: Integrated Intel 6th and 7th Gen Core i3/i5/i7 processors (e.g., i3-6006U, i5-7200U).

Memory Architecture: Supports DDR4 SODIMM RAM with dual-channel interleaved design. Key Integrated Components: Super I/O (EC): ENE KB9022Q D. PWM Controller: ON Semiconductor NCP81218. Audio Codec: RealTek ALC3227. Network: RealTek RTL8111HSH Gigabit Ethernet. Critical Power Rails & Troubleshooting

The schematic defines specific voltage sequences essential for a successful power-on self-test (POST).

Always-On Rails: Outputs of 3.3V and 5V are typically present as soon as power is connected.

Runtime Rails: The 1.8V and 1V rails are "Always On" in some configurations, while others transition to a "Run" state at specific pins (e.g., pin 8 and 9 for 5V). Common Faults: Incorrect pinouts – A mislabeled IC pin can

No +VCC_CORE: Often caused by failures in the CPU power delivery circuit or communication errors with the SOC.

No Power / Dead: Frequently linked to shorts in the U30 power distribution area or charging circuitry.

No Display: Technicians often report "no display" issues that require BIOS/EC firmware reflashing or checking the SOC communication lines. Documentation & Resources

For repair professionals, having both the schematic and the boardview is standard practice for tracing broken traces or identifying burnt components.

The LA-E791P Rev 2.0 schematic diagram (also known as the Compal CSL50/CSL52 motherboard used in HP 15-BS series laptops) is available through several specialized engineering and repair repositories.  Verified Schematic Resources 

You can find the verified schematic and boardview files at the following locations: 

Scribd: A comprehensive 55-page LA-E791P Rev 2.0 Schematic Overview is available, detailing the Sky Lake-U system block diagram, power management, and voltage regulation modules.

Schematics Archive (Telegram): The schematics|boardviews| ARCHIVE often hosts verified PDF versions of Compal motherboards for technicians.

Repair Communities: The Laptop Bios & Schematic Facebook Group is a common hub where users share and verify these specific revision files for troubleshooting power issues like +VCC_CORE.  Technical Highlights of Rev 2.0 

If you are using this for a repair, the Rev 2.0 diagram includes critical sections for: 

Power Rail Distribution: Detailed mapping of the DC-in and battery charging circuitry.

CPU/SOC Architecture: Hardware connections for Intel Sky Lake-U processors.

Component Labels: Specific part numbers and signal descriptions for the I/O interfaces and thermal management system.  CSL50 LA-E791P Rev 2.0 Schematic | PDF - Scribd

Risks of Unverified Schematics

To appreciate the value of verification, one must understand the dangers of unverified diagrams:

• Incorrect pinouts – A mislabeled IC pin can lead to shorting VCC to ground, destroying the IC and possibly the PCB.
• Missing pull-ups or pull-downs – Without proper verification, a technician might assume a signal is open-drain when it is actually push-pull, causing bus contention.
• Wrong resistor values – Using an incorrect feedback resistor value during repair could set an output voltage too high, damaging downstream components.

2. Rectification and Bulk Capacitor

• Bridge rectifier: GBU806 (8A 600V)
• Bulk capacitor: 150µF 450V (C5) – Note: REV 20 uses 105°C rated, verified by thermal imaging
• Inrush current limiter: NTC 5D-15

2. Signal Integrity and Timing Checks

High-speed interfaces like PCIe, USB, or display ports rely on precise AC coupling capacitors and differential pairs. The verified schematic provides accurate net names, allowing the use of an oscilloscope to check clock signals, data strobes, and reset sequences.

📌 What to Do Next

1. Run the automated ERC/DRC in your CAD environment. Capture the log and paste any warnings into a short “Issues” section

Step 1: Visual Inspection Against Schematic

Print the schematic (A3 size recommended). Physically check:

• Diode polarity (cathode marks on board vs. symbol)
• IC orientation (pin 1 dot/marking)
• Electrolytic capacitor polarity (white stripe = negative)
• Resistor values (color code vs. schematic label)