Lae791p Rev 20 Schematic Better _hot_ Access
The LA-E791P Rev 2.0 (also known by the Compal project name CSL50) is a professional-grade motherboard schematic typically used in laptops such as the HP 15-BS series . This revision provides the blueprint for a system powered by Intel Sky Lake-U processors and supports modern connectivity and power management standards . Core System Specifications
The schematic outlines a highly integrated architecture centered on high-efficiency mobile computing:
Processor (CPU): Designed for Intel Sky Lake-U (6th Generation) SoCs, which integrate the Southbridge (PCH) into a single package .
Memory: Supports DDR4 SO-DIMM modules with an interleaved memory design to optimize data throughput .
Graphics (VGA): Features a dedicated AMD R17M GPU paired with DDR3L VRAM, alongside integrated Intel graphics .
Storage Interfaces: Includes support for both traditional SATA drives and high-speed PCIe (M.2) NVMe SSDs . Power Management and Rail Sequence
Understanding the power delivery is critical for board-level repair. The LA-E791P follows a specific power-on sequence: lae791p rev 20 schematic better
Always-On Rails: The board generates 1.8V and 1.0V "Always" rails immediately upon receiving power .
Primary Outputs: Standard 3.3V and 5V outputs are present to power basic logic and peripheral controllers .
Run Power: The 5V rail transitions to "Run Power" at specific pin triggers (e.g., pins 8 and 9 of the regulator) during the boot process .
GFX/CPU Rails: In "No Display" troubleshooting scenarios, the GFX (graphics) coil supply is often the last to form; if it fails to generate, the system will not initialize video . Key Schematic Sections for Technicians
For effective troubleshooting, the CSL50 LA-E791P Rev 2.0 PDF includes several vital diagrams:
System Block Diagram: A high-level view of how the CPU, GPU, and memory interface . The LA-E791P Rev 2
Voltage Regulation Module (VRM): Details the buck converters responsible for stepping down battery/adapter voltage to CPU-level power .
EC Board Control: Schematics for the Embedded Controller (KBC), which manages the keyboard, power button, and thermal monitoring .
Connector Pin Assignments: Essential for diagnosing faulty HDMI, USB, or Audio processing connections . Troubleshooting Common Issues
No Power/No Display: Often linked to communication issues between the SoC and the BIOS/EC or a failure in the SOC/PCH power requirement checks .
Component Identification: If an IC is burnt (such as a buck converter), technicians often search the schematic for labels like "PU1400" to find the exact part number (e.g., SYX196DQNC) . CSL50 LA-E791P Rev 2.0 Schematic | PDF - Scribd
Based on the part number LAE791P, you are referring to an LCD Timing Controller (T-CON) board, typically found in 32-inch LG or compatible LED/LCD televisions (often associated with panel models like LC320DUE). Memory: Supports DDR4 SO-DIMM modules with an interleaved
When searching for a "better" schematic with "proper features", you are likely looking for the complete service manual that includes the T-CON section, rather than just the generic block diagram often found in user manuals.
Here is a breakdown of the proper features you should look for in a high-quality schematic for the LAE791P Rev 20, and how to interpret them for repair.
Query Analysis: "lae791p rev 20 schematic better" Subject: Technical documentation for legacy power conversion hardware.
A concise, practical write-up of the LAE791P Rev 20 schematic: key blocks, signal flow, power rails, common components, likely functions, troubleshooting hints, and PCB-level considerations for debugging or modification.
| Rail | Voltage | Source | Used By | |---------------|---------|-----------------|---------------------------------| | VIN | 19V | DC Jack / BQ24780 | Charging, main switching | | +PWR_SRC | 19V | VIN via PF1 | High-side MOSFETs | | +VBAT_R | 7.4–12.6V| Battery | BQ24780 (AC/BAT switch) | | +3VALW | 3.3V | TPS51285B (LDO) | EC, RTC, S5 domains | | +5VALW | 5V | TPS51285B (LDO) | USB, SATA, some controllers | | +VCC_CORE | 0.65–1.35V| NCP81215 | CPU Vcore | | +VCCGT | 0.65–1.25V| NCP81215 | iGPU (if present) | | +VCCSA | 1.05V | SY8036 / SY8037 | System Agent | | +VCCIO | 0.95V | SY8037 | DDR3L / DDR4 I/O | | +VCCST | 1.0V | Linear | PCH power well | | +VCCSTG | 1.2V | TPS51285B | PCH graphics well | | +VCC_PRIM_1P05| 1.05V | SY8036 | PLL / clock gen | | +VDDQ | 1.2V / 1.35V | TPS51285B or SY8037 | DDR4 or DDR3L memory |
