Boardview Files (Crucial Companion):
Paid Professional Databases:
Warning: Many schematic hosting sites contain malware, adware, or require paid surveys. Do not download executable (.exe) files labeled as schematics. la-9413p rev 1.0 schematic
Technicians often reference the LA-9413P schematic for two common failure modes:
Legal and safe sources include:
⚠️ Be careful with unknown file-sharing sites; scan all PDFs and .BV files for malware.
Scenario: A Lenovo G40-30 with LA-9413P Rev 1.0 has power (LED on) but no post (no beep, no display). Boardview Files (Crucial Companion):
Using the schematic methodically saves 3–4 hours of random testing.
Diagnostic priorities for "No Power" or "No POST" scenarios. Paid Professional Databases:
| Rail Name | Voltage | Function | Key Component | | :--- | :--- | :--- | :--- | | VIN | 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 |
Look for "Power Tree" or "Power Sequence". Key pages:
