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.
For the LQV77, . Use the PDF to understand why a signal is missing, then use the boardview to physically locate the component. lqv77 laptop schematics
The story of is not about a specific laptop model, but rather a legendary figure in the niche world of global electronics repair. The Origin: Lê Quang Vinh is the online alias of Lê Quang Vinh Unlocking the Blueprint: A Deep Dive into LQV77
However, I can help you in these ways: