Chapter 3- Circuit Theory; Block Diagram - Dell E2009W Service Manual

Block Diagram

There are 4pcs PCBA in this monitor, one is power& inverter board which is a single layer board, one is
interface board , one is keypad which is OSD control. The system function block diagram as below
This PWA is included switching power supplier, inverter for CCFL and interface board.(fig.1)
INVERTER
1
2
3
4

Chapter 3- CIRCUIT THEORY

MOSFET
INL833
MOSFET
Feedback
Control
POWER
+24V DC output
Snubber
&Schottky
Power
Transformer
Rectifier&
Power
Filter
MOSFET
Circuit
AC Line Filter
AC Input
90V~264V
Fig.1
5
Service Manual
Brightness Control
ON/OFF Control
+5V DC output
Snubber
&Schottky
Feedback
and OVP
Photocoupler
PWM Control IC
LD7552B