La-d401p Schematic _verified_ -

If the laptop turns on and off repeatedly, the issue might lie in the "S0" state rails. The schematic reveals the sequence of Power Good (PG) signals. For example, you can check if the +3VALW rail reaches the EC (IT8226VG) and if the EC replies with RSMRST#.

: The PCH responds by releasing PM_SLP_S3# and PM_SLP_S5# signals, which enable the secondary rails: +1.2V_VCCST / +1.2V (DDR4 Memory Power) +1.0V_Core (PCH/CPU Core Aux) +1.8V_ALW

The PFC circuit boosts the rectified voltage (approx 320V DC) up to a higher DC voltage (typically around 380V–400V). This ensures the power supply runs efficiently. la-d401p schematic

When looking at the block diagram of the LA-D401P, you can generally break it down into four main sections:

: Intel Skylake-U (6th Gen) or Kabylake-U series. If the laptop turns on and off repeatedly,

: Available in both Integrated (UMA) and Discrete (Nvidia) configurations. Essential Schematic Diagrams

The EC acts as the brain for the power-on sequence. It receives the button press, checks for power, and communicates with the BIOS. PWRBTN# , EC_RSMRST# , LID_SW# . 5. CPU and GPU VCORE Rails : The PCH responds by releasing PM_SLP_S3# and

: DDR4 SODIMM slots (typically dual-channel, up to 2133MHz or 2400MHz).

: Stabilizes the PCH core logic lanes and high-speed PCIe system buses.

: Detailed maps of the 19V primary rail, 3.3V/5V always-on rails, and specific CPU core voltages.