Fan Led; Jpwrled1: Led Power Input - MSI MPG X299M GAMING EDGE AC Quick Start Manual

Fan LED

This LED indicates the fan control mode.

JPWRLED1: LED power input

This connector is used by retailers to demonstrate onboard LED light effects.
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Onboard LEDs
CPU_FAN1 LED
JPWRLED1 - LED power input
LED Color Fan control mode
Red PWM mode
Green DC mode