Acer AL1702 AL1702 Service Guide - Page 12

4.5 List of I/O Pin Assignments of the I307 Pin No. Port Signal Name Initial Function Setting 3 P5.0 KEY_POWER H ON/OFF monitor power 2 P5.1 KEY_MENU H OSD enter/exit enable 1 P5.2 KEY_PLUS H OSD right enable 42 P5.3 KEY_MINUS H OSD left enable 41 P5.4 KEY_DOWN H OSD down enable 38 P1.0 LED_G H LED green enable 37 P1.1 LED_A H LED amber enable 20 P1.2 SCL H Clock of 3-wire bus for scaler 21 P1.3 SDA H Data of 3-wire bus for scaler 22 P1.4 CSZ H Chip select of 3-wire bus for scaler 25 P1.5 HWRESET H Reset enable to scaler 29 P3.0 RXD H UART interface data IN 28 P3.1 TXD H UART interface data OUT 19 P3.2 INT H Interrupt signal from the scaler 13 P3.4 ISDA H EEPROM data bus 14 P3.5 ISCL H EEPROM clock bus 27 P6.0 DDC_WP L DDC EEPROM write protection 26 P6.1 VGA_DET H VGA cable connected 9 P6.3 PANELVCC_EN L Panel power enable 31 P6.5 BKLT_EN L Back light power enable 32 P6.6 AUDIO_EN L Audio power enable 33 P6.7 MUTE L Audio mute enable Note : Other I/O pin assignments of the I305 MST8111B 73 PWM0 BKLT_ADJ - Backlight brightness control 74 PWM1 VOLUME - Audio volume control AL1702 Page 10