La-e801p Rev 2.0 Schematic Upd

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.

The LA-E801P Rev 2.0 is a motherboard schematic manufactured by Compal (internal codes CSL50/CSL52) primarily used in HP 15-bs and 15-bw series laptops. Key Technical Specifications The LA-E801P Rev 2

According to documentation from Scribd and other technical archives:

Platform Architecture: Supports 6th and 7th Gen Intel Core processors (Kaby Lake/Skylake-U).

Memory: Features two DDR4 SO-DIMM slots supporting dual-channel memory at speeds up to 2133MHz at 1.2V.

Graphics: Available in both UMA (Integrated) and Discrete (R17M-M1-30 or R17M-M2-50) configurations using PCIe 3.0 (8Gb/s). Power Rails: Main input: 19V. System rails: 3.3V and 5V (Always-on). DDR Power: 1.2V. Common Issues & Repair Insights

Technical community reviews from forums like Elvikom highlight specific failure points:

Power Inrush Faults: A common failure point is the PQA1 chip (PE642DT dual transistor), which often causes "no power" or "no lights" symptoms.

Short Circuits: Technicians often report low resistance on the source side of the first MOSFET (PQB1) or the PQA1 chip, even when the MOSFET itself tests fine.

Graphics Conversion: If the discrete GPU is shorted, some technicians perform a "Non-Graphic Conversion" by disconnecting specific power supplies (e.g., VGA GFX, Graphic Core Regulator) to allow the board to run on integrated graphics. Where to Find the Schematic Full Documents: Often hosted on Scribd or Studocu. Search the schematic for "DC_IN" or "PWR_SRC"

Technician Archives: Community repositories like schematics|boardviews Telegram frequently share both the PDF schematic and the .BRD boardview files.

Are you currently troubleshooting a specific power rail or looking for a component value on this board? schematics|boardviews| ARCHIVE – Telegram

I was unable to find a publicly available schematic document specifically labeled "LA-E801P Rev 2.0".

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

Case 3: Short Circuit on Main Power (19V rail)

Symptoms: Power adapter immediately shuts down or sparks.

Using the Schematic:

  1. Search the schematic for "DC_IN" or "PWR_SRC" .
  2. It will show you the isolation MOSFETs (PQ1 and PQ2). The schematic reveals the gate driver circuit. A common fault is a shorted PCN1 (ceramic capacitor) near the DC jack. Use the schematic to trace parallel capacitors and remove the shorted one.

Likely Identification

  • LA-E801P is a motherboard model number designed by Compal (common manufacturer for Dell, HP, Lenovo).
  • It is most likely the mainboard for a Dell laptop (e.g., Inspiron or Vostro series) from around 2015–2017.
  • Rev 2.0 indicates a revised version; schematics for Rev 1.0 may be similar but not identical.

Final Pro Tips

  • Do not use the schematic as a substitute for the boardview – you will spend hours searching for R168.
  • Revision matters: Rev 2.0 has a different EC pinout than Rev 1.0 or 3.0. Verify your board says LA-E801P REV 2.0 near the RAM slots.
  • When stuck: Search Badcaps with the exact symptom and LA-E801P. Many repair logs exist.

If you cannot find the file after 30 minutes of searching, reply with "boardview needed" and I can describe the exact resistor/transistor locations for common failure points without the diagram.

Since the LA-E801P Rev 2.0 is not a consumer-grade product (like a sound card or GPU) but rather a bare logic board/controller PCB typically used in industrial computing, LED display control, or embedded systems, writing a "user review" requires a technical perspective.

Here is a technical review of the schematic and board design from the perspective of an electronics engineer or hardware integrator.