Gigabyte GA-H61TN User Manual page 24

18) BL_SW (Back Light Switch)
The Back Light switch provides the function for screen back light adjustment.
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.
Pin No. Definition
1
1
2
Pin No. Definition
4
1
2
3
1
4
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BL_DOWN
BL_UP
Speaker OUT L-
Speaker OUT L+
Speaker OUT R+
Speaker OUT R-