If you are currently troubleshooting this motherboard, providing a few specific details can help narrow down the problem. Please let me know:
Integrated Intel HD Graphics or Discrete NVIDIA GeForce 940MX/GTX 950M.
Repairing a dead LA-E791P requires tracing the power rails sequentially. Laptop motherboards do not turn on all voltages simultaneously; they follow a strict step-by-step startup sequence. 1. The Primary Input Stage (+19V Rail) lae791p rev 20 schematic diagram verified
💡 Always verify your specific board revision (Rev 1.0 vs Rev 2.0) before flashing BIOS or measuring test points, as small component changes can exist between versions.
If you are looking for specific troubleshooting help for the , let me know the symptoms (e.g., "power light on, screen black", "no power at all") and I can guide you through the next steps! Share public link Laptop motherboards do not turn on all voltages
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Manages power-on sequencing, keyboard matrix, thermal monitoring, and battery charging communications. 2. Deciphering the Power Sequencing (Step-by-Step) If you are looking for specific troubleshooting help
Use a multimeter in continuity mode. Inject 1V–2V (never full voltage) into the shorted rail and use a thermal camera or isopropyl alcohol to find the capacitor that heats up. 2. Corrupted BIOS / EC Firmware
Enables power rails for memory, chipset, and finally the CPU. Troubleshooting Guide Using the Schematic 1. No Power / No LED Indicator Check DC Jack: Measure at the input MOSFETs. Check Input MOSFETs: Check if they are conducting.