These are the "always-on" rails for the EC and PCH's RTC domain. The SY8286 IC is a common failure point. Measure pin 7 (EN), pin 12 (VIN), and pins 1-2 (SW output).
Finding the exact value of resistors, capacitors, and ICs (e.g., finding the correct PWM IC for charging). la-c811p schematic
Signals like +3.3V_ALW , SIO_PWRBTN# , DGPU_PWR_EN connect across multiple pages. If a net has the same name on page 6 and page 12, they are physically connected. These are the "always-on" rails for the EC
Boardview + schematic = complete repair capability. pin 12 (VIN)