Service manual

XGA Interface Board (PWB-0535)

CON1 : Connect with Control board

Pin No. Symbol Function

1 Mute

OSD, Audio Mute Function Button

2 SP- Adjust audio volume smaller

3 SP+ Adjust audio volume louder

4 Menu Call out or close the OSD menu or come back to the

previous menu

5 Down Choose the next one item or value

6 Up Choose the last one item or value

7 Sel Select

8 GND Ground

9 Amber Indicate the system in power saving mode

10 Green Indicate the system in active mode

11 GND Ground

12 Power Power on/off control port

4.4 INTERNAL CONNECTOR & PIN ASSIGNMENT

CON3 : Connect to the PWB-0537, which is power/audio board

Pin No. Symbol Function

1 SENSOR Detect audio I/P signal

2 GND Ground

3 +12V DC+12V

4 GND Ground

5 CCFL_EN Backlight lamps ON(high)/Off(Low) control

6 GPIO2/PWM2 Brightness adjustments (Low Max./ Hi. Min.)

7 MUTE+ Audio Must control (High means SPK off, Low means On)

8 GND Ground

9 +5V DC+5V

10 +5V DC+5V

11 STDBY Audio Stand-by control (Hi means stand-by, Low means Normal)

12 VOLUME Speaker volume control (0V means Sound off, 1.2V means MAX.)

ViewSonic Corporation

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VG500b