Lac781p Schematic Top -

If you are looking for the schematic to repair a module:

Look for the RT8243 (or similar) PWM controller. This chip generates the "always-on" (ALW) voltages required to power the EC and BIOS before the user even presses the power button. lac781p schematic top

The "top" of the LA-C781P board typically contains the following critical systems: If you are looking for the schematic to

These must be present for the laptop to respond to the power button. A short in the KB9022Q EC is a common cause for the +3.3V rail being missing. lac781p schematic top