Optima L903A Service Manual page 18

19" Wide LCD Color Monitor
5.2.2 Inverter / Power Board
AC inlet Filter
Start circuit R904, R931, R938
On/off control
PWM control IC
Dimming control
Rectifier and
filter
Switching circuit
PWM control
IC&MOSFET
Start circuit
Transform
er
OVP/OCP circuit
Push-pull
circuit
18
Optima L903A
Rectifier and
filter D908,
D909
To main board
Feedback
circuit IC902,
IC903
LC resonant
Feedback circuit
12V/5V
12V
Lamp