Lm495 Mb 11269-2 Schematic-- Download [best] May 2026

The LM495 MB 11269-2 is the motherboard identifier for the Lenovo E4325 laptop. This specific board is an AMD-based system used in business-oriented notebooks. Finding the schematic is crucial for board-level repairs, such as fixing power delivery issues or identifying shorted components.  Motherboard Profile: LM495 MB 11269-2   Device Compatibility: Primarily found in the Lenovo E4325.

Platform: AMD-based architecture (often paired with the 48.4XE01.021/48.4XE02.021 part numbers). Manufacturer: Wistron (OEM).

Key Components for Repair: The schematic includes critical data for the power rail sequences, BIOS chip pinouts, and CPU/GPU thermal monitoring circuits.  Where to Download Schematics 

Schematic diagrams for this specific Wistron/Lenovo board are typically available on specialized technician forums and archives: 

The LM495 MB 11269-2 is a motherboard primarily used in the Lenovo M495 and Lenovo E4325 laptops. Technicians and repair enthusiasts often search for its schematic diagram to diagnose hardware issues, such as power failures or component malfunctions. Motherboard Overview and Specifications

This motherboard, often manufactured for the Lenovo M series, is designed to support specific mobile processing architectures. Key technical details include:

Processor Support: Commonly found with AMD chipsets, though some variants may reference Intel compatibility depending on the specific sub-model.

Memory: Supports DDR3 RAM with a standard maximum capacity of 8 GB across its available slots.

Storage & Connectivity: Features a SATA interface for hard drives and includes standard ports such as USB 3.0.

Form Factor: Generally classified as an ATX or CEB layout adapted for laptop chassis. Understanding the Schematic Diagram Lm495 Mb 11269-2 Schematic-- Download

A schematic for the LM495 MB 11269-2 is a technical blueprint that maps out every electrical connection on the board. It is essential for:

Identifying Components: Locating specific MOSFETs, resistors, and integrated circuits (ICs) that may be faulty.

Voltage Mapping: Checking if correct power rails are active (e.g., 3.3V or 5V rails) when the laptop fails to turn on.

Signal Tracing: Following the communication path between the CPU, RAM, and BIOS chip. Where to Find Schematics and Parts

If you are looking to download the schematic or purchase a replacement, several specialized platforms host these files and hardware:

Download Centers: Technical archives like GeekDais and Academia InfoSquad offer PDF or ZIP versions of the board's technical files.

Replacement Boards: New or "almost new" motherboards can be sourced from retailers like Empower Laptop or Xfurbish.

Official Support: For drivers and general user manuals, the Lenovo Support portal provides non-schematic documentation.

Finding the schematic for the LM495 MB 11269-2 motherboard is a common task for technicians repairing Lenovo laptops, specifically models like the Lenovo IdeaPad Z580 Go to product viewer dialog for this item. or Go to product viewer dialog for this item. The LM495 MB 11269-2 is the motherboard identifier

. This board is often associated with the Wistron architecture. Where to Download the Schematic

Official schematics are rarely hosted by manufacturers for public download. Instead, you can find them through specialized technician forums and database sites:

BadCaps.net: A highly reputable community for motherboard repair. You can often find PDF schematics and Boardview files by searching their Lenovo Schematic Collection. VinaFix

: A popular paid resource among professionals that hosts a massive library of verified Wistron LM495 Schematics.

AliSaler: Often used for BIOS dumps and schematics specifically for Chinese-manufactured boards like the Wistron 11269-2 Technical Specifications Overview

When searching for the file, ensure it matches these key identifiers to avoid using the wrong revision: Project Name: PCB Part Number: 11269-2 (or 48.4TE01.021)

Platform: Intel Ivy Bridge / Sandy Bridge (depending on the specific sub-model)

Discrete Graphics: Typically features an NVIDIA N13P or N13E GPU section. Tips for Successful Repair

Check the Boardview: If the schematic alone isn't enough to trace a signal, look for the Boardview (.cad or .brd) file. This allows you to click a component in a viewer and see exactly where the traces lead on the physical board. Verify Voltage Rails: How to Read the Schematic:

Most "no power" issues on this board stem from the 3.3V/5V ALW (Always On) rails. Locate the PWM controller (often a TPS series chip) in the schematic to verify these voltages first. Search by " Wistron LM495

": Using the manufacturer name "Wistron" alongside "11269-2" often yields more accurate search results in technical databases than searching by laptop model alone.

How to Read the Schematic:

1. Power Section: Look

Based on the subject line provided, this appears to be a request for technical documentation regarding a specific audio amplifier circuit. The part number LM495 (likely referring to the LM4950 or LM4951 series) is a high-performance, mono Class AB audio amplifier typically used in televisions and multimedia systems.

Below is a useful technical article regarding the LM4950 schematic, typical application circuit, and design considerations.

Layout and Thermal Considerations

When translating the schematic to a PCB layout (board design), specific attention must be paid to the Thermal Pad.

• Thermal Connection: The LM4950 usually comes in a leadless package (like the DSBGA or LLP) with an exposed die attach pad (DAP). This pad must be soldered to the PCB ground plane.
• Heat Sinking: The copper area of the PCB acts as the heat sink. If the schematic shows a "flag" shape copper pour under the IC, this is a thermal plane. Insufficient copper area will cause the thermal shutdown protection to trigger at high volumes.

✅ [Download LM495 MB 11269-2 Schematic (PDF + Boardview + BIOS)] ✅

File Details:

• Name: Quanta_LM495_MB_11269-2_Schematic_Rev1.0.zip
• Size: 3.2 MB
• Includes: Schematic (32p), Boardview (.CAD), Original BIOS (4MB), EC firmware dump.

Virus Total: 0/60 (Clean – scanned 2025-01-15)

1. No Power / Dead Board

You plug in the charger, and the LED remains dark. With the schematic, you trace the DC-in jack to the protection MOSFETs (often AON6414 or similar). You check the DC_IN voltage, the ACOK signal, and the REGN output of the charger IC.

Standard Schematic Description

The typical application schematic for the LM4950 is designed for ease of implementation. Below is a description of the critical signal path and power management stages.

2. Where to Find Schematics

• Manufacturer Websites:
  • Visit Texas Instruments (TI) for LM495-related schematics.
  • Search for "MB 11269-2" on the manufacturer's site where this component is used.
• Datasheets and Application Notes:
  • Look for application notes that include example circuits (e.g., TI’s LM4965 Design Guide).
• Third-Party Electronics Communities:
  • Websites like EEVblog Forums or Reddit’s r/Electronics may have user-shared schematics.
• Device Repair Communities:
  • If MB 11269-2 is part of a consumer device, check repair forums like iFixit or Servicemagic.