The lqv77 (Le Quang Vinh) archive, formerly hosted on lqv77.com, is a widely used collection of laptop schematics and boardview files that persists through various online repositories. While the original WordPress blog is largely inactive, specific schematics can be located through community archives, including Telegram, EDABoard, and Scribd. To find specific files, searching by the motherboard number is recommended. How to download laptop schematics diagrams part 2 02-Jul-2021 —
If you have an LQV77 laptop on your repair bench exhibiting a common failure mode—such as "No Power"—here is how you use the schematic to isolate the fault: Step 1: Check the Primary Rail ( +19V / VIN )
If the board fails to power on, technicians should first check the EC's power supply (3.3V ALW) and the 32.768kHz crystal oscillation using an oscilloscope. No clock signal to the EC results in a dead motherboard.
Check the inductors located around the CPU socket/die. If +VCC_CORE is hovering around 0.8V to 1.0V, the primary power sequence has concluded successfully.
The primary 19V–20V power delivered directly from the charger or battery connector. 3.3V / 5.0V Always-On Rails
Allows you to inject voltage into a shorted rail identified via the schematic to safely pinpoint the failing component through heat generation. Tips for Reading LQV77 Schematic Diagrams
This article provides a deep dive into understanding, finding, and using LQV77 schematics for troubleshooting power issues, no-display scenarios, and more. What are LQV77 Laptop Schematics?
The software will visually highlight exactly where that resistor sits on the top or bottom of the physical board.
Understanding and Troubleshooting with LQV77 Laptop Schematics
curl https://fleep.io/software/linux/fleep.asc | sudo apt-key add -
sudo add-apt-repository -u "deb https://builds.fleep.ee/linux/ `lsb_release -cs` fleep"
sudo apt-get install fleep