Diagram Verified [exclusive] | Lae791p Rev 20 Schematic

Based on the document designator LAE791P and the revision number Rev 20, this appears to be a schematic diagram for an H3LA Solid-state Timer (or a similar industrial control timer module) produced by Omron.

Below is a draft of the complete technical content required for a verified Schematic Diagram document. This content assumes the standard configuration for an industrial PCB timer with relay output and RC snubber suppression.

Why It Matters

Imagine a textile mill in 2024 still running a loom controlled by an LAE791P board. The machine hiccups. The line stops. The manufacturer went bankrupt in 1998. The operator finds a dusty PDF in a forum. It’s labeled "LAE791P REV 20."

If it is unverified, the operator risks frying the board because the diagram shows a resistor at R45, but the board has a diode there. If it is verified, the operator trusts the map. They solder the joint, the machine hums back to life, and the legacy continues for another decade.

"LAE791P REV 20 schematic diagram verified" is more than a technical note. It is a declaration that the machine is understood, documented, and ready to work. It is the final word in a conversation that started forty years ago.

LA-E791P Rev 2.0 is more than just a series of traces on a fiberglass board; it is the "heart" of the

series laptops. To a technician, this verified schematic is the map to a treasure hunt. The Story of the

Imagine a laptop that has gone completely dark. No lights, no fan, no life. The owner is a student whose entire thesis is locked inside. Most shops would call it a "dead board" and suggest a total replacement, but for a technician with the LA-E791P Rev 2.0 schematic , the story is just beginning. The Entry Point

: The technician starts at the DC-in jack. Using the schematic from sources like , they trace the 19V rail as it enters the board. The Silent Saboteur lae791p rev 20 schematic diagram verified

: The schematic reveals a complex power management system. In this story, a tiny, microscopic capacitor near the Sky Lake-U CPU

has shorted to ground. Without the diagram, finding this single component among thousands would be impossible. The Critical Handshake : The diagram shows how the EC (Embedded Controller)

must "talk" to the BIOS chip to allow the power-on sequence. The technician sees that a signal is missing—a single line on page 42 of the schematic isn't pulling high. The Resurrection

: With a single drop of solder and a replacement component identified by its exact part number in the schematic, the connection is restored. The technician presses the power button, the fan spins, and the HP logo flickers back to life. Technical Identity Common Chassis : HP 250 G6, HP 15-BS series. Core Architecture

: Supports 6th, 7th, and 8th Gen Intel Core processors (i3/i5/i7). Key Features

: Includes DDR4 SO-DIMM slots, SATA/PCIe interfaces, and often an integrated AMD R17M GPU in specific configurations. Reliability

The LA-E791P Rev 2.0 motherboard (often labeled CSL50/CSL52) is a core component for several mid-range HP laptops, most notably the HP 250 G6 and the HP 15-BS series. This specific revision is essential for technicians dealing with common power issues like "No Display" or "No +VCC_CORE". Hardware Overview: LA-E791P Rev 2.0

The board is designed to support Intel's 6th and 7th Generation Sky Lake-U and Kaby Lake-U processors. Based on the document designator LAE791P and the

Processor Support: Intel Core i3-6006U, i5-6200U, and i7 variants. Memory: Typically features two DDR4 SODIMM slots.

Key ICs: Includes the ENE KB9022Q D Super I/O, NCP81218 power controller, and RealTek RTD2166IBN for display management. Ports: Integrated HDMI, VGA, USB 3.0, and Ethernet. Critical Sections of the Schematic

A verified schematic for this board provides granular details necessary for complex board-level repairs:

System Block Diagram: Outlines the Sky Lake-U architecture and how high-speed signals interface with the PCH.

Power Distribution: Essential for tracking voltage rails from the DC-in connector through the Voltage Regulation Module (VRM).

Charging Circuitry: Detailed schematics for the battery charging IC, often a point of failure for laptops that won't charge or power on.

Signal Description Table: Helps identify pinouts for connectors like the keyboard, fan, and storage interfaces. Verified Technical Resources

For those performing active repairs, verified files can be found through professional community repositories: CSL50 LA-E791P Rev 2.0 Schematic | PDF - Scribd Why It Matters Imagine a textile mill in

The LA-E791P Rev 2.0 (often referred to under the Compal project name CSL50/CSL52) is a specialized motherboard schematic primarily used for repairing and diagnosing HP 250 G6 and HP 15-BS series laptops. For a technician, a verified schematic like this serves as a definitive blueprint of the system’s electrical architecture, detailing every component from the CPU to individual resistors and capacitors. Hardware Architecture and Components

The Rev 2.0 schematic outlines a robust architecture designed for 6th and 7th Gen Intel Core (Skylake-U/Kaby Lake-U) processors. Key technical highlights include:

GPU Integration: Support for UMA (Integrated) graphics or discrete AMD R17M GPUs with dedicated DDR3L VRAM.

Memory Support: The board is designed for DDR4 SO-DIMM memory, typically featuring one or two onboard slots for system upgrades.

Connectivity: Detailed pinouts for essential I/O interfaces, including HDMI, USB 3.0, Ethernet (RJ-45), and SATA for storage drives.

Power Management: Comprehensive sections on the Voltage Regulation Module (VRM), battery charging circuitry, and thermal management systems. The Role of Verified Schematics in Repair

In board-level repair, a "verified" status is critical for ensuring that the diagram accurately matches the physical traces and component values of the motherboard version in hand. CSL50 LA-E791P Rev 2.0 Schematic | PDF - Scribd

Description

LAE791P Rev 20 is an updated schematic for the LAE791P board/module. The verified schematic includes component identifiers, reference designators, net names, power rails, connectors, and key signal paths (clock, reset, data buses, power sequencing). It reflects corrections from earlier revisions and adds updated decoupling, connector pinouts, and protection components.

Case 4: Blown Fuse on Startup

  • Don’t just replace fuse! Follow the schematic: Check bridge rectifier (D1-D4), NTC (TH1), and MOSFET Q1 for short circuit.

5.

Change Log Highlights (example)

  • Corrected net name on main data bus (D7–D0) — fixed mismatch causing contention.
  • Added recommended 0.1 µF and 10 µF decoupling per VCC rail.
  • Updated connector J2 pinout and added keyed housing recommendation.
  • Added TVS on VIN and series resistors on sensitive I/O pins.

Contents of the Verified Schematic Package

  • Complete one-page schematic diagram (PDF + source files)
  • BOM (Bill of Materials) with reference designators, values, package types, and manufacturer part numbers
  • Connector pinout tables and mating-part recommendations
  • Power rail summary (voltage levels, max currents, recommended regulators)
  • Key signal descriptions (function, direction, typical voltage levels)
  • Design notes and change log for Rev 20 (what was fixed/updated vs. Rev 19)
  • Test points and recommended probe points for verification
  • PCB footprint references and recommended layout notes
  • ESD/protection and recommended fusing details

📋 Sample “Verification Report” (Template)

You can paste this into a Word/Google doc, fill in the findings, and attach it to your change‑request.

LAE791P – Rev 20  Schematic Verification Report
------------------------------------------------
Date: 2026‑04‑12
Prepared by: ______________________
1. Title Block & Revision History
   • OK – All fields filled.
   • Minor note: add “Approved by QA” signature line.
2. Symbol & Footprint Consistency
   • 3 custom symbols found (U‑CUSTOM1, J‑CUSTOM2, X‑CUSTOM3).
   • U‑CUSTOM1 pins 5 & 6 swapped vs. datasheet – corrected.
3. Netlist / Connectivity
   • All power pins of MCU connected to +3.3 V net.
   • UART_RX left floating – tied to GND via 47 kΩ (added TP‑UART_RX).
4. Power‑Supply Section
   • LDO output decoupling: 1 µF + 0.1 µF on each pin – OK.
   • Missing bulk cap on 5 V rail – added C‑BULK1 (10 µF, X5R).
5. High‑Speed Signals
   • USB_DP/DM length mismatch 0.6 mm (spec ≤0.3 mm) – will be corrected in layout.
   • Added 33 Ω series termination for SPI_SCLK.
6. Component Values
   • R‑45 (10 kΩ) was 5 % – replaced with 1 % part.
   • C‑23 (22 pF) tolerance OK for crystal load.
7. Safety / EMC
   • TVS D‑5 placed on VIN – rated 6 kV (spec 8 kV). Recommendation: replace with SMF5.0A.
   • All I/O have ESD diodes – confirmed.
8. Documentation
   • Net labels follow hierarchical naming convention.
   • Added block diagram page 2 for system overview.
9. Automated Checks
   • Altium ERC: 2 warnings (NC pin on J1, duplicate net “+5V”).
   • KiCad ERC: 0 errors after correction.
Conclusion:
   The schematic meets all functional and compliance requirements after the above amendments. No critical errors remain. Recommend proceeding to layout review.
Signature: ______________________

Case 3: Excessive Noise on 5V Rail

  • Check on schematic: Secondary filter L3 (1.5µH) and C22 (1000µF)
  • Common REV 20 issue: C22 is a low-ESR type; replacing with general-purpose cap increases ripple 3x.