Often uses the or similar for 3.3V/5V standby rails. KBC / Multi-IO
A common symptom is the laptop failing to power on or react to the power button. Technicians often check for missing "standby" (dezhurka) voltages or insufficient voltage at the power button (e.g., reports of only 3.7V instead of the expected 3.3V). 10203-1 la56 mb 48.4jw06.011 schematic