ASROCK IMB-1224P User Manual page 21

Backlight Volume Control
(7-pin BLT_VOL1)
(see p.8, No. 10)
ESPI Header
(17-pin ESPI1)
(see p.8, No. 22)
MCU Header
(9-pin MCU1)
(see p.8, No. 16)
SMBUS_TEST1
(4-pin SMBUS_TEST1)
(see p.8, No. 15)
1
1
21
PIN Signal Name
7 GND
6 GND
5 BLT_DW
4 BLT_UP
3 PWRDN
2 GPIO_VOL_DW
1 GPIO_VOL_UP
PIN Signal Name
1 +3V
2 SMB_CLK
3 SMB_DATA
4 GND