Inverter Board Diagram; I/F Circuit - BenQ G700 Service Manual

BenQ G700

5.3 Inverter board diagram:

Vcc+14v
+5v
PWM CONTROL
(OZ9938GN)
Brightnes
s
ON/OFF

5.3.1 I/F Circuit

5.3.1.1 RGB CAPTURE
- Signal RED,GREEN,BLUE input through CN103 #1,#2,#3, Stop DC via C119, C121 and C123,
and then enter into U106 (scaler) analog input terminal #12,#14,#16, and then scaler deals with
signal internally.
- Signal DDC_SCL (series clock) inputs via CN103#15, and then passes through ZD101 Zener for
ESD protection, goes into U103#5.
- Signal DDC_SDA (series data) inputs via CN103#12, and then passes through ZD104 Zener for
ESD protection, goes into U103 #8.
- Signal TTL vertical sync. (Vsync) inputs via CN103 #14, and then clamped by ZD102 Zener,
passes through R165, and then goes into IC U106 (scaler) #8.
- Signal TTL horizontal sync. (Hsync) inputs via CN103 #13, and then clamped by ZD103 Zener,
passes through FB104,R167, and then goes into IC U106 (scaler) #9.
- CN103#5 is defined as cable detect pin, this detector realize passes through R160 Pull high, go
Switch(MOSFET)
PWM1
PWM2
Switch(MOSFET)
Open protection
PUSH-PULL INVERTER
31
Service Manual
Transformer
1
Transformer2
Lamp1
Lamp2
Lamp3
Lamp3
Lamp1
50KHz
Lamp2
50KHz
50KHz
Lamp3
50KHz
Lamp4