LENOVO LEGION 5 Power Button Flashing

Motherboard / System Board

The flashing LED indicates the Embedded Controller is active but the system has failed the power-up handshake. This is typically due to a shorted MOSFET or a failed Power Management IC (PMIC) on the motherboard that prevents the board from reaching the 'Power Good' state required for CPU initialization. Replacing the motherboard is the primary resolution for logic-based power-cycling failures.

CMOS RTC Battery

A depleted or unstable Real-Time Clock (RTC) battery can cause the BIOS to hang during the early POST phase. This results in a state where the power indicator blinks as the system attempts to initialize hardware with corrupted or missing CMOS configuration data. Replacing this component restores the volatile memory required for the boot sequence.

AC Power Adapter (230W/300W)

The Legion 5 requires high-wattage input to satisfy the initial power draw of the GPU and CPU during startup. If the power adapter's internal capacitors have degraded, it may provide enough voltage to trigger the LED (standby power) but fail to provide the amperage required for full system spin-up, causing the status light to blink as the rail collapses and resets.

SKU: ADL230SDC3A