La-e791p Rev 2.0 Schematic Diagram 🆕

LA-E791P Rev 2.0 motherboard (code-named CSL50/CSL52 ) is a high-performance laptop mainboard manufactured by Compal Electronics

laptop series. This guide provides a technical overview based on schematic data to assist with diagnostic and repair tasks. AliExpress Core System Architecture

The board is designed around a unified "U-series" architecture, typically integrating the CPU and PCH into a single package to save space and power. CPU Support: Compatible with Intel Sky Lake-U (6th Gen) Kaby Lake-U (7th Gen)

processors, ranging from Celeron/Pentium up to Core i3/i5/i7 models (e.g., i3-6006U, i5-6200U).

Features two DDR4 SO-DIMM slots, though some variants may have integrated memory or a single slot. Most revisions use UMA (Integrated Intel Graphics) , but high-end versions can include an AMD R17M discrete GPU with dedicated DDR3L VRAM. AliExpress Key Schematic Sections

A complete schematic for the LA-E791P typically contains approximately 43 to 60 pages of technical data, including: Power Management Diagram:

Outlines the "Power Sequence" or how the board wakes up after the power button is pressed. Voltage Regulation Module (VRM): Details the power rails for the CPU core ( positive 1.2 cap V ), and system standby ( positive 3 cap V cap L cap P positive 5 cap V cap L cap P Peripheral Connectivity:

Schematics for SATA (Storage), PCIe (M.2/Wi-Fi), HDMI, USB 3.0, and Audio processing. Embedded Controller (EC):

The logic for keyboard, fan control, and battery charging is managed here. Troubleshooting & Power Rails

Common diagnostic points on this board involve checking the power passage through specific coils:

The LA-E791P Rev 2.0 Schematic Diagram is a technical blueprint for the Compal CSL50/CSL52 motherboard. This board is commonly found in laptop models like the HP 250 G6, HP 15-BS, and HP 15-BW series. Technical Overview

The schematic provides a detailed map of the hardware components and their electrical connections:

Processor Support: Designed for Intel Sky Lake-U or Kaby Lake-U 15W CPUs.

Graphics: Supports systems with integrated UMA graphics or discrete AMD R17M GPUs with DDR3L VRAM.

Memory & Storage: Outlines the DDR4 SO-DIMM slots and interfaces for SATA 3.0 and PCIe (M.2) ports.

Connectivity: Includes details for RTL8111HSH-CG LAN, USB 3.0/2.0 ports, and NGFF WLAN+BT modules.

Power Management: Features the ENE KB9022QD Embedded Controller (EC) and a detailed power sequence for troubleshooting boot issues. Review for Technicians

Clarity & Detail: The diagram is highly rated by repair professionals for its clear component labeling and part numbers, making it essential for trace repair and component replacement.

Troubleshooting Utility: It is particularly useful for diagnosing common "No Display" or "No Power" issues, such as +VCC_CORE rail failures often linked to the SOC.

Accessibility: While it is a proprietary Compal document, it is widely available on technician forums and platforms like Scribd and ChinaFix.

Pairing with Boardview: For physical board repair, it is best used alongside the Boardview (.BRD or .CAD) file to locate specific components on the physical PCB. CSL50 LA-E791P Rev 2.0 Schematic | PDF - Scribd

Understanding the LA-E791P Rev 2.0 schematic diagram is essential for technicians repairing the widely-used Go to product viewer dialog for this item. and Go to product viewer dialog for this item. series laptops. This motherboard, often labeled as the CSL50/CSL52 La-e791p Rev 2.0 Schematic Diagram

, serves as the backbone for several budget-friendly 15-inch HP notebooks. The schematic acts as a roadmap for identifying component values, signal paths, and power rails when dealing with "dead" boards or display issues. Key Technical Specifications The LA-E791P motherboard typically features: 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

: 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

Confirm you want the full technical guide and I’ll produce the detailed walkthrough.

Mastering the LA-E791P Rev 2.0 Schematic Diagram: The Ultimate Repair Guide for Vostro 5471 & Inspiron 5471

4. How to Use the Schematic for Troubleshooting

Here is a practical workflow for a "Dead Laptop" using this schematic:

Step 1: Visual Inspection

Step 2: Check Power Rails (Shorts)

Step 3: Follow the Signals

Critical Power Rails and Their Presence in the Schematic

When you open the LA-E791P Rev 2.0 schematic, you will be greeted with dozens of pages. Focus on these five critical sections:

4. Embedded Controller (IT8987E) – Page 11-14

The EC handles power sequencing. In the schematic, you will see the "Power Button" matrix.

If you need power sequence or troubleshooting

The typical Intel power sequence on LA-E791P:

  1. DC-in → VIN (present)
  2. +3VALW / +5VALW (always-on after AC_IN)
  3. EC powers on → sends SLP_Sx signals to PCH
  4. PCH → CPU VR → VCC_CORE → VCC_GT
  5. VDDQ (memory) & 1.05V rails

If you’re stuck at a specific voltage level (e.g., no +3VALW), I can help you trace likely MOSFETs, resistors, or enable signals based on commonly used reference designs for Compal LA-ExxxP boards.

Would you like me to:

Let me know — I’ll happily walk you through the repair logic. LA-E791P Rev 2

Understanding the Compal LA-E791P Rev 2.0 Schematic Diagram For laptop repair technicians and electronics enthusiasts, the LA-E791P Rev 2.0 schematic diagram is an essential roadmap. This specific motherboard—often found in the Acer Aspire A315-51 and A315-33 series—is a complex piece of engineering. Having the schematic allows you to move beyond "parts swapping" and perform precise component-level repairs. Technical Specifications Overview

The LA-E791P (often codenamed C5V01) is a DDR4-based motherboard typically supporting Intel Skylake or Kaby Lake processors.

Revision: 2.0 (Includes specific circuit refinements over the 1.0 version). Architecture: Integrated SoC (System on Chip) design.

Power Rails: Features a complex DC-to-DC conversion system to step down 19V adapter power to 5V, 3.3V, 1.0V, and CPU core voltages. Key Sections of the Schematic 1. The Power Sequence (Power Rails)

The LA-E791P schematic details the "Power On Sequence." If a laptop won't turn on, you use this section to check: +19VB: The main voltage from the adapter.

+3VALW / +5VALW: The "Always On" voltages required for the Super I/O chip to function. +1.2VP: The dedicated power rail for DDR4 RAM. 2. Charging Circuit (Charger IC)

Laptops that won't charge or don't recognize the battery often have faults in the charging area. The schematic identifies the Charging IC (commonly a BQ-series chip) and the MOSFETs responsible for switching between battery and AC power. 3. Super I/O and BIOS

The KB9022 (or similar) Super I/O chip is the brain of the motherboard's power management. The schematic shows exactly which pins handle the power button signal (ON/OFFBTN#) and the "All Power Good" signal, which tells the CPU it is safe to boot. 4. Signal Mapping and Connectors The Rev 2.0 diagram provides pinouts for:

LVDS/EDP Connector: For troubleshooting "no backlight" or "no display" issues.

SATA/M.2 Slots: For data recovery or drive recognition problems. USB and Audio: Pin-to-pin mapping for peripheral ports. Common Troubleshooting Scenarios The "Dead" Motherboard

Using the schematic, a technician will first check the +19V rail at the entry MOSFETs. If the 19V is present but the laptop doesn't start, the schematic points you to the 3V/5V Regulator IC. By measuring the Enable (EN) pins defined in the Rev 2.0 document, you can determine if the IC is faulty or if it’s simply not being told to turn on. Short Circuit Detection

If your lab power supply shows a "short to ground," the schematic helps you isolate the rail. By identifying which capacitors and MOSFETs are linked to a specific voltage line, you can use a multimeter (or thermal camera) to find the exact component causing the failure. Summary for Technicians

The LA-E791P Rev 2.0 Schematic is more than just a drawing; it is a diagnostic tool. Whether you are dealing with a liquid spill, a BIOS failure, or a burnt power MOSFET, this document ensures you are working with data rather than guesswork.

Pro Tip: Always pair this schematic with the Boardview (.CAD or .BRD) file if available. While the schematic tells you how components are connected electrically, the Boardview shows you exactly where they are physically located on the PCB.

Based on the board code LA-E791P, you are referring to a motherboard found in the Lenovo G50-80 (and related models like the Z50-70/Z50-80) laptop series. This is a mainstream consumer laptop board, and "Rev 2.0" indicates a specific board revision.

Below is a comprehensive guide on how to obtain, read, and utilize the schematic diagram for the LA-E791P motherboard.

Page 40-45: Embedded Controller (EC)

The EC is the "brain" for turning on power. The schematic reveals the logic levels: LID_SW#, AC_IN#. A common failure is the EC losing its program (corrupt BIOS). The diagram tells you which SPI pins (CS#, SO, SI, CLK) to probe to see if the EC is talking to the main BIOS.

Section 1: Power Supply (Charger & MOSFETs)

Understanding the Compal LA-E791P (Rev 2.0) Schematic Diagram

If you are a laptop repair technician or a DIY enthusiast, finding the LA-E791P Rev 2.0 schematic is often the first step in reviving a "dead" motherboard. This specific board, manufactured by Compal, is commonly found in the Acer Aspire A315-51 and A315-31 series.

When a laptop fails to power on, exhibits a "no display" symptom, or suffers from a short circuit, the schematic diagram acts as your GPS through the complex layers of the PCB. 1. Board Specifications at a Glance

The LA-E791P (also known as the C5V01) is designed for budget-friendly but reliable laptops. Key components usually found on this board include: Board overview and major functional blocks (CPU/SoC area,

Processor: Integrated Intel Kaby Lake-U or Apollo Lake (depending on the specific model variant). Memory: DDR4 SODIMM slot (often with 4GB onboard RAM). GPU: Integrated Intel HD Graphics. Controller: ENE KB9022Q embedded controller (EC). 2. Why the Rev 2.0 Schematic is Critical

Motherboard revisions (Rev 1.0 vs. Rev 2.0) often feature changes in power rail sequencing or component placement. Using the wrong version can lead to incorrect voltage measurements. The Rev 2.0 schematic provides the precise:

Power Sequence: The order in which voltages (3.3V, 5V, 1.05V, etc.) must wake up.

Component Values: Essential for identifying charred resistors or blown capacitors.

Signal Names: Helping you trace signals like PM_SLP_S3# or ACIN to the Super I/O chip. 3. Key Sections to Troubleshoot

When analyzing the LA-E791P Rev 2.0, focus on these high-failure areas: The Charging Circuit (Charger IC)

The board typically uses an ISL or BQ series charging chip. If the laptop doesn't charge or run on AC power, check the "DC-IN" page of the schematic. Ensure the first and second MOSFETs are opening to allow 19V to pass into the main power rail (B+). The 3V/5V Always-On Rails

The standby IC creates the +3VALW and +5VALW voltages. Without these, the power button will do nothing. The schematic will show you which "Enable" pins are required from the EC to trigger these rails. BIOS and EC Firmware

The LA-E791P relies heavily on the communication between the BIOS chip and the KB9022Q. If you have voltages but no boot, the schematic helps you verify the SPI bus signals (CS, CLK, Data) to ensure the firmware is being read. 4. Professional Repair Tips

Voltage Injection: If you find a short on the B+ rail, use the schematic to find a safe entry point for your DC power supply to identify the heating component.

Boardview Pairing: For the best results, use the LA-E791P Boardview file (.cad or .brd) alongside the PDF schematic. This allows you to physically locate the pins mentioned in the diagrams.

Common Failure: Look for liquid damage around the LVDS (screen) connector, which often shorts the backlight high-voltage rail to data lines. Conclusion

The LA-E791P Rev 2.0 schematic is an indispensable tool for component-level repair. Whether you are dealing with a liquid spill or a random power failure, having the circuit map allows you to work with surgical precision rather than guesswork.

The LA-E791P Rev 2.0 (also known as the CSL50/CSL52) is a motherboard manufactured by Compal for the HP 250 G6 and HP 15-BS series laptops. The schematic diagram is a vital technical document for component-level repair, detailing the power distribution and signal paths for this specific hardware revision. Schematic & Technical Overview

The schematic covers a system architecture typically built around the Intel Skylake-U (6th Gen) or Kaby Lake-U (7th/8th Gen) processors.

Architecture: Supports Intel Core i3, i5, and i7 processors, often paired with an AMD R17M discrete GPU and DDR4 SO-DIMM memory. Key Power Rails: +19.5VB (Main Rail): The primary input from the adapter.

Always-On Rails: Includes +3VALW and +5VALW, which must be present for the laptop to trigger power.

Secondary Rails: Features rails such as +1.8V_PRIM and +1.2V_VDDQ (RAM power).

Critical ICs: Often utilizes the BQ24725 as the charging controller to manage the battery and main 19V input. Common Issues & Troubleshooting

Repair specialists often use the LA-E791P schematic to diagnose several recurring faults:

  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.

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