1.10.2 Internal connectors Asus prime Asus M3A78

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ASUS M3A78

1-31

Ensure that the audio device of Sound playback is VIA High Definition Audio 

(the name may be different based on the OS). Go to Start > Control Panel > 

Sounds and Audio Devices > Sound Playback to configure the setting.

R

M3A78

M3A78 Digital Audio Connector

+5

V

SPDIFOU

T

GN
D

SPDIF_OUT

8.  Chassis intrusion connector (4-1 pin CHASSIS)

This connector is for a chassis-mounted intrusion detection sensor or switch. 

Connect one end of the chassis intrusion sensor or switch cable to this 

connector. The chassis intrusion sensor or switch sends a high-level signal to 

this connector when a chassis component is removed or replaced. The signal 

is then generated as a chassis intrusion event.
By default, the pins labeled “Chassis Signal” and “GND” are shorted with 

a jumper cap. Remove the jumper caps only when you intend to use the 

chassis intrusion detection feature.

R

M3A78

M3A78 Chassis intrusion connector

CHASSIS

+5VSB_MB

Chassis Signal GN

D

(Default)