Acer Aspire 4740 / 4745 / 5745G Motherboard (Compal LA-5681P) Schematics, Boardview & BIOS Bin
Motherboard Specifications
The Compal LA-5681P (NAL90/NALG0 Rev: 1.0) is a motherboard designed for the Acer Aspire 4740, 4745, and 5745G series laptops. This platform typically features first-generation Intel Core processors (Arrandale) and supports DDR3 memory. Depending on the specific configuration, it may include discrete graphics to support multimedia tasks.
- Board Model: Compal LA-5681P (NAL90 / NALG0)
- Supported Models: Acer Aspire 4740, 4740G, 4745, 4745G, 5745, 5745G
- PCB Revision: Rev 1.0
- Platform: Intel Arrandale / HM55 Chipset
Common Chip-Level Faults & Repair Notes
When troubleshooting a dead, no-power, or no-display Acer Aspire 4740/4745/5745G (LA-5681P board), verify the following common failure points:
- 19V Main Power Rail (VIN): Check the main input MOSFETs (PQ1, PQ2) and the charging IC for shorts or failure to pass 19V to the system.
- 3V/5V ALW Standby: Ensure the Always-On 3.3V and 5V coils are generating voltage before the power button is pressed. A missing 3.3V rail often points to a faulty standby IC or a shorted EC/KBC.
- No Display / Black Screen: Very common on older Arrandale platforms. Often resolved by a clean BIOS flash using an SPI programmer (like RT809F or CH341A) or by addressing the discrete GPU if present.
Free Download Section
1. Acer Aspire 4740/4745/5745G (LA-5681P) Schematic Diagram (.PDF)
Download the official schematic diagram to easily trace power rails, component pins, and data lines for advanced motherboard repair.
2. Acer Aspire 4740/4745/5745G (LA-5681P) Boardview File
Locate exact component positions (resistors, capacitors, ICs) and test points on the LA-5681P PCB with this boardview file.
If you don't have BoardView Software, you can download it here: Board Viewer Software Free Download
3. Acer Aspire 4740/4745/5745G Clean BIOS + EC Bin File
SPI Flash dump for reviving dead boards, fixing fan issues, and resolving blank screen POST failures.
Always remember: Backup your original BIOS chip to a USB or hard drive before flashing the new bin file. This ensures you can revert the system state if needed.
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