ViewSonic VX2739wm-1 Service Manual page 20

+5VD will provide：
1. via Q3：+5VA(for audio AMP)
2. via J6 to USB HUB(for GL805G)
Backlight Control：
CON1.9 is inverter on/off control pin,which 5V is ON,0V is OFF；CON1.10 is
Brighthess control pin,control way is PWM,0% is darkest,100% is brilliant.
LCD panel power and signal：
CON5 is FFC connector which provided for LCD panel LVDS,the LVDS singnal
sent from TSUMO88GDI.
AUDIO：
The outputs for Audio are CON7、CON6、J4、J3, CON7 is I2S digital signal,
which proceed to TSUMO88GDI, transferred to internal signals, to U12(Audio
AMP),to speaker via CON6, or earphone via J4.
VIDEO：
The outputs for video are CON7、CON8、CON2 as below：
CON7：HDMI
CON8：DVI
CON2：D-SUB
These signals will transmit to TSUMO88GDI,transferred to LVDS, to LCD Panel
via CON5 for programming.
KEYPAD & LED DISPLAY：
CON3 is KEY and LED board connector, controlled way for key board is from
ADC, build in TSUMO88GDI. When user press the buttons, identified by
TSUMO88GDI fordifferent voltage to control the right action by TSUMO88GDI.
Controlled way for LED board is from GPIO, Power off：LED is dark, Power on：
LED is blue light, standby mode：LED is orange light, which controlled by
TSUMO88GDI.
ViewSonic Corporation
CONFIDENTIAL – DO NOT COPY
20
VX2739wm-1
VX2739wm-CN