If all voltages are present but there is no display, verify that each regulator is sending a PGOOD signal to the EC.
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 lad711p rev 10 schematic top
Modern motherboards like the LAD711P use high-density, multi-layer PCBs. When soldering components identified on the top-side schematic, use a pre-heater or a high-quality hot air station. The ground planes on these boards act as massive heat sinks, making it easy to accidentally rip pads if the board isn't sufficiently heated. If all voltages are present but there is
Diodes (Check for shorts in the protection circuits). R/C Series: Resistors and Capacitors. Safety and Precision R/C Series: Resistors and Capacitors