Lae801p Rev 20 Schematic Better Review
A better schematic can imply several things:
Is the LAE801P Rev 20 schematic worth fixing?
Yes – if you have existing boards or spares. The core topology is solid, but the original designer cut corners on EMI, gate drive, and compensation.
The “better” schematic provided above transforms a mediocre power board into a reliable, low-noise, efficient module suitable for sensitive loads (e.g., sensor arrays, precision motor drivers).
This report provides a detailed overview of the LA-E801P (CSL50/CSL52)
motherboard schematic, specifically focusing on Revision 2.0. This board is commonly found in HP 15-BS and 15-BW series laptops powered by Intel Sky Lake-U or Kaby Lake-U processors. 1. Board Specifications & Identification Model Name: CSL50 / CSL52 PCB Part Number:
Revision: 2.0 (Updates from Rev 1.0 often include minor power rail stabilizations) Platform: Intel Sky Lake-U / Kaby Lake-U (6th/7th Gen) lae801p rev 20 schematic better
Supported Device Examples: HP Notebook 15-bs0xx, 15-bs1xx, 15-bw series. 2. Major Architecture & Power Rails LA-E801P Rev 2.0
utilizes a standard Compal architecture. Key technical sections in the schematic typically include: Key Components / Features CPU/SOC Integrated Intel Core i3/i5/i7 (U-series). BGA soldered. Memory Dual DDR4 SO-DIMM slots, supporting up to 2133/2400MHz. Power Rails
Main rails include +3VLP, +3VALW, +5VALW, +1.0VALW, and +VCC_CORE. Graphics
Integrated Intel HD Graphics; some versions feature discrete AMD Radeon GPUs. I/O Ports
HDMI, USB 3.0, RJ45 (LAN), and eDP connector for the display. 3. Common Repair Points & Issues A better schematic can imply several things: Is
Technicians frequently reference this schematic to troubleshoot "No Power" or "No Display" scenarios:
Charging IC: Often uses the ISL or BQ series chips. Check the ACIN and ACOK signals if the laptop won't charge or turn on.
BIOS: The Rev 2.0 often requires a specific BIOS dump. For repair, verified BIOS files can be found on community platforms like IndiaFix .
Voltage Rails: Verify the +3.3V and +5V standby rails are present at the coils near the power management IC. 4. Technical Resources
To perform a deep-level repair or board tracing, you can access the following resources: This report provides a detailed overview of the
Schematic PDF: Detailed diagrams showing trace paths and component values (e.g., resistors/capacitors) are available on Scribd .
Video Walkthroughs: Visual guides for Rev 1.0/2.0 diagnostics can be found on channels like ColombiaTech .
The error amplifier loop was a known weakness. Older schematics used a standard 50k/10k divider but lacked a phase-lead capacitor.
Rev 20 introduces: A type-II compensation network with selectable zero placement. The new schematic includes pads for Cc (100pF to 1nF) and Rc (1k to 10k), allowing engineers to tailor transient response.
Quantitative improvement: Phase margin improves from 45° to 68° typical, eliminating output ringing during load steps.
| Connector | Pin | Signal | Rev 20 Change vs Rev 19 | |-----------|-----|--------|--------------------------| | X1 | 1 | +24V | No change | | X1 | 2 | GND | No change | | X2 | 5 | CAN_H | Added 120Ω termination option | | X3 | 8 | Analog In 4 | Input filter changed (RC values) |
Rev 20 adds Schottky diodes from each input/output to ground and supply rails (BAT54S configuration). This clamping network increases ESD robustness from 2kV to 8kV (HBM), per IEC 61000-4-2.
