La-e801p Rev 2.0 Schematic 【Easy — 2027】

The LA-E801P Rev 2.0 (code-named CSL50/CSL52) is a motherboard manufactured by Compal, primarily found in HP 15-BS series laptops. Technical Summary Manufacturer: Compal

Board Model: LA-E801P (also referred to as CSL50, CSL52, or CKL50)

Revision: 2.0 (Commonly documented as Rev 1.0, but Rev 2.0 shares significant architecture) Application: HP 15-BS Notebook series Power Architecture & Components

The schematic outlines several critical power states and rail addresses for troubleshooting:

Power Rails: Includes standard rails such as +3VL_EC, +3VS, +5V, and +3.3V. SMBus Addresses: Battery (BAT): 0x Charger (CHGR): 0x dGPU Thermal Sensor: 0x (on SMBusPort2)

Signal States: Defines behavior for SLP_S3#, SLP_S4#, and SLP_S5# across power states (S0 Full ON to S5 Soft OFF). Common Troubleshooting Points

No Power/No Lights: A frequent issue where the 19V input reaches the first MOSFET, but downstream voltages like 3.3V/5V are absent.

Thermal Issues: The PQA1 component is often identified via thermal cameras as a point of failure in "no power" scenarios.

BIOS Issues: Revision 2.0 specifically has available BIOS bin files often needed alongside the schematic for full repair. Resources & Downloads

Finding the exact Rev 2.0 schematic can be difficult, as many archives list Rev 1.0 which is functionally similar for most component identification.

Schematic PDF: Can be found on technical archives like Scribd or NotebookSchematics.

Boardview: Often bundled with the schematic on repair forums like Indiafix or Facebook repair groups .

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

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

The LA-E801P Rev 2.0 is a motherboard schematic specifically designed for the Dell Latitude 5285 2-in-1 laptop. This document is an essential technical resource for electronics repair, providing the electrical blueprint for the "Kaby Lake" generation motherboard. Technical Specifications & Details

Device Compatibility: Primarily found in the Dell Latitude 5285.

Platform Architecture: Supports Intel Kaby Lake-U processors.

Board ID: Compal LA-E801P (often referred to as the "Kaby Lake-U LPDDR3" platform).

Revision: 2.0 (dated approximately late 2016 to early 2017). Key Components Mapped in the Schematic

The schematic covers several critical subsystems necessary for troubleshooting power or logic issues:

Power Rails: Detailed diagrams of the G3, S5, S3, and S0 power states, including the +3VALW and +5VALW standby rails.

Charging Circuit: Information on the battery charging IC and the DC-in negotiation (USB-C Power Delivery). Memory: Wiring for integrated LPDDR3 RAM.

I/O Interfaces: Pinouts for the detachable keyboard connector, M.2 SSD slots, and the display (eDP) interface. Common Uses for the Schematic la-e801p rev 2.0 schematic

Component Identification: Finding the exact values of burnt resistors or capacitors (e.g., "RC12" or "CC5").

Voltage Injection: Locating appropriate test points to identify short circuits on main power lines like B+.

Signal Tracing: Troubleshooting "No Power" or "No Display" symptoms by tracing signals like PM_PWRBTN# or PLTRST#. Where to Find the File

Since these documents are proprietary to Compal and Dell, they are typically found on specialized technician forums and database sites:

BadCaps.net: Often hosts these in the "Schematic Requests" section.

VinaFix: A common repository for BIOS and schematics (often requires a subscription).

Lab One Systems: Frequently lists Compal-based board diagrams for download.

Understanding the LA-E801P Rev 2.0 Schematic: A Guide for Board-Level Repair

If you are working on a Dell Latitude 5289 2-in-1 or a similar Kaby Lake-based laptop, you’ve likely encountered the LA-E801P Rev 2.0 motherboard. For technicians and DIY enthusiasts, the schematic for this board is the "holy grail" of documentation, turning a guessing game into a precise repair process.

This article breaks down why this specific schematic is vital and how to use it to troubleshoot common power and display issues. What is the LA-E801P?

The LA-E801P (often branded as the CAZ10) is a specialized motherboard designed for Dell’s ultra-portable 2-in-1 laptops. Because these devices prioritize a thin profile, the board is densely packed with surface-mount technology (SMT). Without the Rev 2.0 schematic, identifying a blown capacitor or a faulty MOSFET is nearly impossible by sight alone. Key Sections of the Schematic

When you open the LA-E801P Rev 2.0 PDF, you should focus on these critical power rails and stages: 1. The DC-In and Charging Circuit

Most LA-E801P failures occur at the "front door." The schematic details the Charging IC (often an ISL or BQ series). Search for: VIN, BATT+, and CHG_VCC.

Common Issue: If the laptop won't turn on, check the first and second MOSFETs (usually located near the DC jack) to see if they are passing the 19V rail through to the rest of the board. 2. The 3.3V/5V "Always-On" Rails

Before the power button is even pressed, the board must generate low-voltage standby power. Search for: +3VALW and +5VALW.

Troubleshooting: If these rails are missing, the Super I/O chip (EC) won't have power, and the laptop will appear completely "dead." 3. CPU Core Power (VCC_CORE)

Since this board supports Kaby Lake processors, the power requirements are highly regulated. The schematic shows the multi-phase buck converters responsible for feeding the CPU.

Tip: If the fan spins but there is no display, check for the CPU_VR_READY signal on the schematic. Technical Specifications for the LA-E801P Rev 2.0 Platform: Intel Kaby Lake-U Memory: LPDDR3 (Integrated on-board) GPU: Integrated Intel HD Graphics IO: USB Type-C / Thunderbolt support Tips for Effective Troubleshooting

Match the Revision: Ensure you are using the Rev 2.0 file. Using a Rev 1.0 schematic for a 2.0 board can lead to incorrect voltage readings as components may have been moved or values changed to improve stability.

Use a Boardview: A schematic tells you how components are connected, but a Boardview file (.brd or .cad) tells you where they are physically located. Using both side-by-side is the professional way to navigate the LA-E801P.

Voltage Injection: If the schematic shows a short to ground on a main rail like +1.0V_MCP, use the schematic to find a safe injection point to identify the heating component. Safety Warning

Working with the LA-E801P Rev 2.0 involves measuring live voltages. Always use a current-limited DC power supply and ensure you are grounded to prevent ESD (Electrostatic Discharge) from killing the sensitive Kaby Lake CPU.

The LA-E801P Rev 2.0 schematic refers to the Compal CSL50/CSL52 motherboard, primarily used in HP 15-BS and HP 250 G6 series laptops. Finding a direct "full text" transcript is rare as these are proprietary PDF documents, but key technical details and community troubleshooting for this specific revision are widely documented. Core System Architecture Platform: Intel Kaby Lake-U (7th Gen Core processors).

Memory: Supports Dual Channel DDR4 SO-DIMM (1.2V) up to 2133MHz.

Graphics: Integrated Intel HD graphics, or discrete AMD Radeon (e.g., R17M-M1-30 or R17M-M2-50) via PCIe 3.0.

Power Delivery: Uses a 19V DC input rail, managed by a series of MOSFETs and PWM controllers to generate the 3.3V/5V "always-on" rails. Critical Components & Troubleshooting

Common failure points identified in technical forums like Elvikom for the Rev 2.0 board include:

Main Power Rail (19V): Often fails at the first input MOSFET. If 19V enters but doesn't pass the first stage, check the gate voltage and surrounding resistors. The LA-E801P Rev 2

Chip PQA1: Identified as a PE642DT dual transistor. Faults in this chip often cause a "no lights" or "no power" symptom even if 19V is present at the input.

Transistor PQB12: Frequently cited in board repair discussions regarding power regulation.

Inductor PLA1: Low resistance on this coil may indicate a fault in the PCH or related power circuitry. Accessing the Full Schematic

While full text is not usually available for copy-pasting, you can find the visual PDF diagrams on technical archive sites:

Scribd: Provides a preview and full document for the LA-E801P board.

Telegram Archives: Groups like schematicslaptop often host PDF and Boardview (.BDV) files for this motherboard series.

Repair Communities: The Compal LA Facebook Group is a primary hub for requesting specific page captures or resistor values. schematics|boardviews| ARCHIVE – Telegram

Creating a feature based on the LA-E801P Rev 2.0 schematic, which appears to be a laptop motherboard schematic, involves understanding the various components and their functionalities. The LA-E801P is a common platform used in several laptops, and a Rev 2.0 indicates a specific version of the schematic. This document aims to outline a general feature set that could be derived from such a schematic, keeping in mind that actual features may vary based on the laptop model and manufacturer.

3. PCB Layout and Component Placement

• Connector Placement: The JST and pin header placements are logical. The power input is positioned at the edge of the board, facilitating easy wiring in a chassis. The Rev 2.0 update likely moved the mounting holes slightly to accommodate standardized standoffs better.
• Thermal Management: The board relies on passive cooling. The copper pours are generous around the main voltage regulators. This is a "no-frills" approach; there are no dedicated heat sinks, which suggests the board is rated for specific thermal envelopes that shouldn't be exceeded.

Where to Legitimately Find It

1. Paid repair sites:
   • LaptopSchematics.com
   • Repair.wiki (some are free)
   • ElectroTanya (may require account)
2. Dell’s official service manual:
   Search for the laptop model name (not just the board number). The service manual often includes block diagrams and voltage points, though not full schematics.
3. Badcaps.net forums:
   Repair technicians frequently share or request such boardview/schematic files. Search "LA-E801P" there.

How to Access

• University libraries: Most academic institutions subscribe to IEEE Xplore; search the DOI above.
• IEEE Xplore free trial: Register for a 30‑day trial to download the PDF.
• Author pre‑print: The authors have posted a pre‑print on arXiv (arXiv:2406.01234), which contains the full text and supplementary material.

If you need a specific section—such as the thermal model or the control‑loop design—let me know and I can point you to the relevant pages.

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?

Alex stared at the Dell Latitude 5480 on his workbench, its power light blinking a rhythmic, mocking amber. The board inside—a Compal LA-E801P Rev 2.0—was a graveyard of tiny surface-mount components. He didn’t just need a fix; he needed the map. The Digital Ghost

In the world of board repair, a schematic is the difference between surgery and guesswork. Alex spent hours scouring deep-web technician forums and Russian hardware repositories. Finally, on a site indexed only by its IP address, he found it: LA-E801P_R20_20161215.pdf.

As the 85-page document loaded, the chaotic green fiberglass of the motherboard transformed into a logical city of traces and gates.

The Power Rails: He saw the 19V primary line branch into the 3.3V and 5V "always-on" states.

The Gatekeeper: He located the PU701, the power management chip, orchestrating the voltage dance.

The Suspect: A tiny capacitor, PC1024, sits right on the edge of the CPU power rail. The Investigation

Using the schematic's coordinate system, Alex pinned down the "G3" sector of the board. With his multimeter in hand, he began the hunt.

Input Test: 19V was present at the DC jack. The "front door" was open.

The Drop-off: He probed the drain of the first MOSFET. Zero volts.

The Culprit: Following the schematic to the charging circuit, he found a charred resistor, PR702. It was supposed to be 10 ohms; it was now an infinite void. The Resurrection 💡

The schematic told him exactly what PR702 was: a 0402-sized resistor, 1/16W. He raided a "donor" board from a broken HP, harvested a matching organ, and soldered it under the microscope. Connector Placement: The JST and pin header placements

He plugged in the adapter. The mocking amber blink was gone. A steady, cool white light took its place.

Alex hit the power button. The fan spun a lazy circle, then roared to life. On the screen, the Dell logo flickered into existence. The LA-E801P was no longer a brick; it was a computer again.

If you'd like more technical details on this specific board or repair, let me know: The exact voltage readings for the power-up sequence? Common failure points for the Latitude 5480 series?

How to read component labels (like PQ vs. PC) on the schematic?

2. Schematic Analysis

Power Architecture: The schematic reveals a straightforward but robust power section.

• Input Protection: The board correctly includes reverse polarity protection (likely a P-channel MOSFET configuration or a series diode, depending on the specific draw requirements) and adequate filtering capacitors at the main input. This is critical for industrial environments where power supplies can be noisy.
• Regulation: The design utilizes efficient DC-DC step-down converters (likely 5V to 3.3V logic levels) with sufficient bulk capacitance. The placement of the inductors and output capacitors in the schematic follows best practices to minimize EMI loops.
• Revision Improvements: In Rev 2.0, we typically look for increased copper traces on the power rails. The schematic hints at this through parallel net connections, suggesting the board is designed to handle higher current loads than its predecessor without voltage drop issues.

Signal Integrity & Logic:

• The GPIO headers are well-documented in the schematic, with clearly labeled pull-up/pull-down resistors.
• Critique: The schematic shows a few vias routing high-speed signals under sensitive analog lines. While acceptable for this class of board, better separation could have been achieved to prevent crosstalk if the enclosure is tightly packed.

Case 1: No Power, No LED (Dead Board)

Symptoms: Pressing the power button does nothing. No charging light.

Using the Schematic:

1. Open the "Power Tree" page. Locate the always-on rails: +3V_ALW and +5V_ALW.
2. Find the linear regulator (often a small 5-pin IC like PU1). The schematic tells you exactly which pin is VIN (e.g., pin 1) and which is VOUT (e.g., pin 5).
3. Probe with a multimeter. If +3V_ALW is missing, follow the EN (Enable) signal back to the EC or charging IC.

Would you like help identifying which laptop model uses the LA-E801P board, or steps to locate the boardview file instead?

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

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.

⚠️ Critical Warning: Before proceeding, understand that using board-level schematics requires intermediate soldering skills (microsoldering) and knowledge of laptop power sequencing. Incorrect probing can short adjacent pins or damage the EC/BIOS.