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1-16

Motherboard Pin Denition

4 Onboard LEDs

1. Standby Power LED

The motherboard comes with a standby power LED that lights

up to indicate that the system is ON, in sleep mode, or in

soft-off mode. This is a reminder that you should shut down

the system and unplug the power cable before removing or

plugging in any motherboard component. The illustration

below shows the location of the onboard LED.

2. Hard Disk LED (HD_LED)

The Hard Disk LED is designed to indicate the hard disk activity. It blinks when data

is being written into or read from the hard disk drive. The LED does not light up when

there is no hard disk drive connected to the motherboard or when the hard disk drive

does not function.

3. Q LEDs (BOOT_DEVICE_LED, VGA_LED, DRAM_LED, CPU_LED)

Q LEDs check key components (CPU, DRAM, VGA card, and booting devices) in

sequenceduringmotherboardbootingprocess.Ifanerrorisfound,thecorresponding

LEDashesuntiltheproblemissolved.Thisuser-friendlydesignprovidesanintuitive

way to locate the root problem within seconds.

4. KeyBot LED (KEYBOT_LED)

This LED lights up when the KeyBot button is pressed.

SB_PWR

Standby Power Powered Off

OFF

5. USB BIOS Flashback LED (FLBK_LED)

ThisLEDasheswhenyoupresstheBIOSFlashbackbuttonforBIOSupdate.

6. Q-Code LED (Q_CODE)

The Q-Code LED design provides you with a 2-digit error code that displays the system

status.

Asus B150M-K User Manual

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