Check the "Power On Sequence" to see if the SIO is sending the RSMRST# signal to the PCH. Common Failure Points on the LA-H103P
Handles power sequences and keyboard interface. la-h103p schematic
10th Gen Intel Core (i3-1005G1, i5-1035G1, or i7-1065G7). Check the "Power On Sequence" to see if
Identify where the 19V (DCBATOUT) stops. Is it the first MOSFET or the second? Identify where the 19V (DCBATOUT) stops
On models using USB-C for power, the controller chip (often a TPS variant) can fail due to surges. How to Use the LA-H103P Schematic for Repair
These rails power up the moment you plug in the charger. If the +3VALW rail is missing, the laptop will appear completely dead, as this rail runs the Embedded Controller (EC).
The schematic identifies the exact IC responsible for switching MOSFETs on/off. 3. 3.3V and 5V Always-On Rails