Measure the resistance on all large grey inductors (coils). Low resistance on 3.3V or 5V rails usually indicates a dead PCH or a shorted decoupling capacitor.
Revision 1.0 boards sometimes suffer from corrupted ME (Management Engine) regions, leading to 30-second delay boots or fan-spin-but-no-display issues. Diagnostic Steps Using the Schematic lad711p rev 10 schematic top
When working on a LAD711P Rev 1.0 board, focusing on the top-side schematic and layout is critical because it houses the primary power rails and the CPU/PCH complex. Understanding the LAD711P Power Rail Hierarchy Measure the resistance on all large grey inductors (coils)
The most common reason for consulting the LAD711P schematic is a "No Power" or "No Post" condition. The top-level power distribution usually follows this path: Diagnostic Steps Using the Schematic When working on
Diodes (Check for shorts in the protection circuits). R/C Series: Resistors and Capacitors. Safety and Precision
Often an ISL88739. If the laptop runs on battery but won't charge, or vice versa, this is the primary component to inspect.
Look for liquid damage or burnt caps near the CPU coils on the top side.