Based on the designation , this board is a Lenovo Laptop Motherboard (specifically associated with models like the Lenovo G50-80, G40-80, or Z50-70 series, typically featuring an Intel mainboard architecture).
| Rail Name | Voltage | Function | Key Component | | :--- | :--- | :--- | :--- | | | 19V | Adapter Input | PJ1 (DC Jack) / PF1 (Fuse) | | B+ | 19V | System Main Voltage | PQ301 / PQ302 (MOSFETs) | | 3VPCU / 3.3V | 3.3V | EC Standby Power | PU3 (RT8206 / BQ24xxx) | | 5VPCU / 5V | 5.0V | USB/Peripheral Standby | PU3 | la-9413p rev 1.0 schematic
The schematic reveals that this board is designed for power and reliability, featuring: : Built for Intel Haswell (4th Gen) processors. "LA-9413P Rev 1
Print the power sequence page and keep it next to your workbench. In the world of LA-9413P repairs, voltage always tells the truth—you just need to know where to look. In the world of LA-9413P repairs, voltage always
If you have never used a board schematic before, the LA-9413P Rev 1.0 will likely have 45–55 pages. Here is how to navigate:
She grabbed her soldering iron and a donor LA-9413P board from the scrap pile. Under the microscope, pad C472 was empty. No component. But when she scraped away the solder mask, there it was: a tiny, laser-etched spiral in the copper—a fractal antenna, less than two millimeters wide, connected to nothing in the bill of materials.
