La-e801p Rev 2.0 Schematic

LA-E801P Rev 2.0 (also known by the Compal project names ) is a motherboard schematic used primarily in HP 15-BS series laptops and some Dell Latitude 3580

models. This revision typically features Intel's 6th or 7th generation "U" series processors (Skylake-U or Kaby Lake-U) paired with DDR4 memory. Key Specifications & Architecture Processor Support : Supports Intel Skylake-U Kaby Lake-U 15W processors with integrated PCH. : Dual-channel DDR4 SODIMM slots supporting up to 2133MHz at 1.2V. Graphics Options : Integrated Intel graphics. Discrete (DIS) : Supports dedicated GPUs like the AMD Radeon R17M-M1-30 R17M-M2-50 with up to 4GB of GDDR3 memory. I/O Connectivity

: Includes HDMI (supporting up to 297MHz), USB 3.0, and Gigabit Ethernet (via RTL8111HSH). Critical Circuit Sections

Repair technicians frequently reference specific segments of the LA-E801P Rev 2.0 schematic to troubleshoot common power issues: Power Input (19V Rail)

: The primary 19V line enters through the DC jack and passes through protection MOSFETs. A known troubleshooting point involves the transistor and the

chip (a dual PE642DT transistor) which often fails, leading to "dead" or "no light" symptoms. 3.3V/5V "Always-On" Rails

: The schematic details the step-down converters responsible for these standby voltages. Lack of 3.3V on the power switch is a primary diagnostic step for non-responsive boards. Discrete Graphics Conversion

: Technicians sometimes use the schematic to perform a "UMA conversion," which involves disabling the dedicated AMD GPU power rails (such as

) if the chip is shorted, allowing the laptop to run on integrated graphics. Troubleshooting & Common Faults La E801p | PDF - Scribd

LA-E801P Rev 2.0 (also known by the Compal project names ) is a motherboard used primarily in HP 15-bs series laptops. The schematic details the electrical architecture for boards featuring Intel 6th (Skylake) 7th Generation (Kaby Lake) U-series processors Core System Architecture Processor Support : Integrated Intel Skylake-U or Kaby Lake-U (15W) SoC.

: Dual-channel DDR4 SO-DIMM slots supporting 1.2V modules at speeds up to 2133MHz. Graphics Options : Integrated Intel HD Graphics. Discrete (DIS)

: Optional support for AMD Radeon graphics chips (e.g., R17M series) with dedicated DDR4 VRAM. Storage Interface SATA interface for standard HDDs. M.2 slot supporting SATA/PCIe SSDs. Power & Management Power Rails

: The schematic defines multiple power states including S0 (Full On), S3 (Suspend to RAM), S4 (Suspend to Disk), and S5 (Soft Off). Key IC Components Embedded Controller (EC)

: Manages keyboard, power sequencing, and thermal monitoring via SMBus. Charging IC

: Typically uses chips like the BQ series to manage 19V input and battery charging.

: Integrated Realtek RTL8111HSH Gigabit LAN or RTL8166EH 10/100 LAN connected via PCIe x1. Connectivity & Ports Display Output

: Supports internal eDP for the laptop panel and external HDMI 1.4 (up to 297MHz) or CRT/VGA via a translator chip (RTD2166). USB Support : Includes USB 3.0 (5Gb/s) and USB 2.0 (480Mb/s) ports. or a detailed power sequence diagram from this schematic?

The LA-E801P Rev 2.0 Go to product viewer dialog for this item.

is a specific motherboard (mainboard) model typically found in the HP 15-bs and HP 250 G6 series laptops. Technicians often search for its schematic when a laptop appears "dead"—showing no lights or response to the power button. The "Dead Laptop" Repair Story la-e801p rev 2.0 schematic

In the world of component-level repair, this board is the subject of many troubleshooting "stories" on forums like Elvikom. A typical repair scenario involves:

The Symptom: An HP laptop (often an HP-15t-bs000) arrives with no signs of life. Even with a known-good charger, no LEDs light up.

The Hunt for the Schematic: Because the 19V power rail isn't passing through to the rest of the board, technicians need the schematic to identify which MOSFET is blocking the current. Common "Villains":

The First MOSFET: Often, the 19V reaches the first MOSFET but doesn't exit it.

PQA1 Chip: A common failure point identified in community repairs is the PQA1 chip (a dual transistor like the PE642DT), which can cause low resistance and prevent the board from powering on.

BIOS Corruption: In some cases, the hardware is fine, but the laptop won't boot due to corrupted firmware, requiring a BIOS chip reflash. Technical Context

Title: Deep Dive: Analyzing the LA-E801P Rev 2.0 Schematic – A Repairman’s Perspective

Introduction: The Backbone of the Repair Bench

For anyone deeply involved in electronics repair, specifically within the realm of switch-mode power supplies (SMPS) and LED driver boards, the "LA-E801P Rev 2.0" is a designation that commands respect. Whether you stumbled upon this board inside a LED backlit television or an industrial monitor panel, understanding the schematic of the LA-E801P is less about simply tracing wires and more about understanding the logic of modern power management.

Today, I wanted to take a moment to break down the schematic for this board, discuss the common failure points that aren't always obvious from a visual inspection, and explain why having the Rev 2.0 diagram specifically is crucial for a successful long-term repair.

The Layout: Mapping the Territory

At first glance, the LA-E801P looks like a standard two-board solution (often combined power and inverter/LED driver). When you open up the schematic, you can immediately segment the board into three distinct neighborhoods:

1. The High-Voltage Input Stage: This is where the AC mains enter. The schematic shows the standard noise filtration (line filters) and the bridge rectifier. On the Rev 2.0, pay close attention to the MOV (Metal Oxide Varistor) placement. In earlier revisions, we saw a higher failure rate here due to voltage spikes; Rev 2.0 adjusted the clamping voltage slightly to offer better surge protection.
2. The Primary Side (Hot Ground): This is the heart of the SMPS. The schematic usually centers around the main PWM controller. On the LA-E801P, we often see a robust MOSFET configuration driving the transformer. The schematic reveals the startup resistor network, which is a notorious failure point. If the resistors drift high in value, the controller never gets the initial "kick" of voltage it needs to wake up.
3. The Secondary Side (Cold Ground): This is where the magic happens for the end user—rectification and filtering to produce clean DC rails (typically 12V and 24V, depending on the application).

The Chipset: The Brains of the Operation

One of the most valuable aspects of analyzing the LA-E801P Rev 2.0 schematic is identifying the main PWM chip. While variants exist, this board frequently utilizes a highly integrated controller that handles both the power factor correction (PFC) and the main DC-to-DC conversion.

Looking at the schematic, locate the feedback loop. This usually involves an optocoupler (often labeled PC1 or IC901 on the diagram) and a precision shunt regulator (like the TL431). If you are troubleshooting a unit that has no output but the fuse is fine, this is your first stop. The Rev 2.0 schematic highlights a slight change in the compensation network around this shunt regulator compared to Rev 1.x. This was a factory fix to reduce output ripple under heavy load—knowing this helps if you're wondering why your replacement components aren't stabilizing the voltage as expected.

Common Failure Points (And How the Schematic Helps)

Without the schematic, repairing the LA-E801P is a guessing game. With it, it becomes a science. Here are the top three failures I see on the bench and how the diagram guides the fix:

• The "Dead" Board: If the board is completely dead (no standby light, no click), the schematic points you immediately to the startup circuit. Don't just check the fuse. Trace the high-value resistors feeding the VCC pin of the main controller. The Rev 2.0 uses a specific resistor value pair that runs hot by design; over years, these go open-circuit.
• Low or Fluctuating Output: If your 12V rail is sitting at 8V or jumping around, pull up the schematic and look at the electrolytic capacitors on the secondary side. While you can see physical bulging sometimes, the schematic helps you identify the specific capacitance and ESR requirements for the filtering stage.
• The PFC Hiccup: A very specific issue to this revision involves the PFC detection circuit. The schematic shows a voltage divider network that samples the high voltage bus. If one of those surface-mount resistors develops a hairline crack (common due to thermal cycling), the chip "thinks" the voltage is wrong and shuts the system down, resulting in a "click-click-click" sound.

Why "Rev 2.0" Matters

A common mistake I see junior technicians make

Unlocking the Secrets of LA-E801P Rev 2.0 Schematic: A Comprehensive Guide

In the world of electronics, schematics play a crucial role in understanding the design and functionality of a particular device or circuit board. For those working with the LA-E801P Rev 2.0 schematic, this article aims to provide a detailed overview of the topic, covering its significance, applications, and troubleshooting techniques.

What is an LA-E801P Rev 2.0 Schematic?

An LA-E801P Rev 2.0 schematic is a detailed diagram that represents the electrical connections and components of a specific circuit board. The "LA-E801P" refers to the board's identifier, while "Rev 2.0" indicates that it is the second revision of the design. This schematic serves as a blueprint for engineers, technicians, and manufacturers to understand the board's functionality, identify potential issues, and make necessary repairs or modifications.

Importance of LA-E801P Rev 2.0 Schematic

The LA-E801P Rev 2.0 schematic is essential for various reasons:

1. Troubleshooting: By analyzing the schematic, technicians can quickly identify the source of problems and make targeted repairs, reducing downtime and increasing productivity.
2. Design and Development: The schematic provides valuable insights for engineers and designers, enabling them to modify or improve the board's design, add new features, or optimize performance.
3. Manufacturing and Quality Control: During the production process, the schematic ensures that the boards are assembled correctly and meet the required specifications.

Applications of LA-E801P Rev 2.0 Schematic

The LA-E801P Rev 2.0 schematic is likely used in various industries, including:

1. Consumer Electronics: The board may be used in devices such as laptops, tablets, or smartphones, where it controls specific functions like power management, audio, or display.
2. Industrial Automation: The schematic might be applied in industrial control systems, robotics, or machinery, where it regulates processes, monitors sensors, or interfaces with other devices.
3. Medical Devices: In medical equipment, the LA-E801P Rev 2.0 schematic could be used in devices like patient monitors, defibrillators, or infusion pumps, where it ensures precise control and monitoring.

Understanding the LA-E801P Rev 2.0 Schematic

To effectively work with the LA-E801P Rev 2.0 schematic, it's essential to familiarize yourself with the following components:

1. Connectors and Interfaces: Identify the various connectors, such as USB, HDMI, or audio jacks, and understand their functions.
2. ICs (Integrated Circuits): Recognize the different types of ICs, including processors, memory chips, and voltage regulators.
3. Passive Components: Understand the roles of resistors, capacitors, inductors, and transformers in the circuit.
4. Signal Flow: Analyze the signal paths and relationships between components to comprehend the board's overall functionality.

Troubleshooting Techniques

When working with the LA-E801P Rev 2.0 schematic, you may encounter issues that require troubleshooting. Here are some techniques to help you identify and resolve problems:

1. Visual Inspection: Carefully examine the board for physical damage, signs of wear, or incorrect assembly.
2. Voltage Measurements: Use a multimeter to verify voltage levels at various points on the board, ensuring they match the schematic's specifications.
3. Signal Tracing: Use an oscilloscope or logic analyzer to follow signal paths and detect anomalies.
4. Component Testing: Isolate and test individual components to determine if they are functioning correctly.

Best Practices for Working with LA-E801P Rev 2.0 Schematic

To maximize your productivity and minimize errors when working with the LA-E801P Rev 2.0 schematic:

1. Use the Latest Revision: Ensure you have the most up-to-date version of the schematic to avoid working with outdated information.
2. Consult the Datasheet: Familiarize yourself with the datasheets of individual components to understand their specifications and behavior.
3. Take Notes and Document Changes: Record your findings, modifications, and repairs to maintain a clear history of the board's development and maintenance.
4. Collaborate with Others: Share knowledge and expertise with colleagues to accelerate problem-solving and improve overall understanding of the schematic.

Conclusion

The LA-E801P Rev 2.0 schematic is a vital resource for anyone working with this specific circuit board. By understanding the schematic's components, applications, and troubleshooting techniques, you can efficiently identify and resolve issues, optimize performance, and ensure the board's reliable operation. Whether you're an engineer, technician, or manufacturer, this comprehensive guide has provided you with the knowledge and best practices necessary to unlock the secrets of the LA-E801P Rev 2.0 schematic.

Understanding the LA-E801P Rev 2.0 Motherboard: A Schematic Guide LA-E801P Rev 2

If you are a laptop repair technician or an electronics enthusiast, coming across the LA-E801P Rev 2.0 schematic is like finding the DNA of the laptop. Used primarily in Dell Latitude 5289 2-in-1 models, this Compal motherboard is a sophisticated piece of engineering that integrates power management, high-speed data, and display signals into a compact PCB.

Repairing these boards requires more than just a soldering iron; it requires an understanding of the power sequence and signal flow. 1. Board Overview and Architecture

The LA-E801P is built around the Intel Kaby Lake-U processor series (7th Gen). Because this is a 2-in-1 convertible, the board is designed to handle frequent shifts in orientation, meaning the hinge and sensor connectors are critical points of failure often documented in the schematic. Key Components: CPU: Intel Core i3/i5/i7 (Soldered BGA). RAM: LPDDR3 (On-board, typically non-upgradable).

EC (Embedded Controller): SMSC or ENE chips that handle power-on logic and keyboard input. Power Delivery: USB-C/Thunderbolt charging circuitry. 2. The Power-On Sequence

When troubleshooting a "No Power" or "No Display" issue, the schematic's Power Block Diagram is your best friend. For the LA-E801P, the power rails usually follow this priority:

+3VALW / +5VALW: Always-on rails that should be present as soon as the battery or charger is connected.

+1.0V / +1.8V: Secondary rails for the chipset and memory controller. VCC_CORE: The final rail that powers the CPU.

If you have a "Dead" board, start by checking the DC-IN MOSFETs and the Charging IC (often an ISL or BQ series chip). The schematic will label these as PQ-series components. 3. Common Failure Points on the LA-E801P

Based on technician feedback, several areas frequently require a deep dive into the Rev 2.0 diagrams:

USB-C / Charging Circuit: Since this board relies on USB-C for power, the CC lines and the USB-C Controller chip are high-stress areas. If the laptop won't charge, check the protection diodes near the USB-C port.

BIOS / SPI Flash: Corruption in the BIOS chip (U-series) can lead to a "Black Screen" with the fan spinning. The schematic helps identify the VCC and Hold pins to ensure the chip is receiving power before you attempt a re-flash.

Liquid Damage near the LVDS/EDP Connector: As a convertible, moisture often finds its way into the hinge area, shorting the backlight power rail (+19V) into the data lines. 4. How to Use the Schematic for Repair

To effectively use the LA-E801P Rev 2.0 schematic, follow these steps:

Identify the Rail: Use a multimeter to find which power rail is missing.

Search the Component: Use the "Find" function (Ctrl+F) in your PDF reader to locate the component ID (e.g., PL401) on the schematic.

Analyze the Enable Signal: Look for the EN (Enable) signal for the missing rail. If the controller has power but no Enable signal, the issue lies further back in the logic sequence (often the EC or PCH). Conclusion

The LA-E801P Rev 2.0 schematic is an essential tool for bringing a dead Dell Latitude 5289 back to life. Whether you are dealing with a short circuit on a capacitor or a complex communication issue between the CPU and the RAM, having the map of the board is the only way to ensure a professional, long-lasting repair.

I was unable to find a publicly available schematic document specifically labeled "LA-E801P Rev 2.0". Title: Deep Dive: Analyzing the LA-E801P Rev 2

Based on common laptop motherboard coding, here is what this board number likely refers to and how you can proceed.

8. Ports and Expansion Slots

• USB Ports: Multiple USB ports, including USB-A and possibly USB-C, supporting USB 3.0 or higher speeds.
• Card Reader: A card reader slot supporting SD, MMC, and similar card formats.

Common troubleshooting uses of the schematic

• Tracing missing power rails to a failed regulator or blown fuse
• Locating PMIC enable signals and power-sequencing faults
• Verifying USB/Type-C power-switch and PD controller connections for charging issues
• Identifying reset, clock, and SPI flash lines when debugging boot failures
• Pin-mapping display, keyboard, and other peripherals for replacement or rework

Part 4: Common LA-E801P Failures (From Real Repairs)

1. No power, BQ24735 burns: Replace PU2, PQ30, PQ31, and the 2.2Ω resistor PR63 (open detection).
2. Turns off randomly: Bad capacitors on +1.05V_PCH rail. Replace all 0805 caps near PCH.
3. No display, external works: Blown LCD backlight fuse (PF1 on page 29 – usually marked "P" or "A").
4. BIOS corruption: Corrupt SPI flash. Download clean ME-region BIOS from Badcaps, flash with CH341A programmer. Jumper SPI_PROG (JSPI1) for external flashing.