Gigabyte GA-H77TN - Page 24

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18) BL_SW (Back Light Switch)

1
Pin No. 
1 BL_DOWN
2 BL_UP
19) SPKR (Speaker Header)
This header connects to the speaker on the chassis front panel. The system reports system startup
status by issuing a beep code. One single short beep will be heard if no problem is detected at system
startup.
1
4
Pin No. 
1 Speaker OUT L-
2 Speaker OUT L+
3 Speaker OUT R+
4 Speaker OUT R-