Chapter 3- Circuit Theory; Block Diagram - Dell S1909WNf Service Manual

Block Diagram

There are 2pcs PCBA in this monitor, one is power& inverter board which is a single layer board,
one is interface board .The system function block diagram as below.This PWA is included
switching power supplier, inverter for CCFL and interface board.(fig.1)
1
2
INVERTER
5V

Chapter 3- CIRCUIT THEORY

MOSFET
INL836
Feedback
Control
Brightness Control
ON/OFF Control
AP1117E33A/
LM1117MPX-3.3
3.3V
AP1117E18A/
LM1117MPX-1.8
1.8V
XTAL
14.318M Hz
I2C
24C02
DVI Connector
DVI For Reserved
+12V DC output
Snubber
&Schottky
Power
Transformer
Rectifier&
Power
Filter
MOSFET
Circuit
AC Line Filter
AC Input
90V~264V
Panel Interface
One Connector
5V
Scalar
Mstar TSUM1PEJ-LF-2
DVI VGA
VGA Connector
Fig.1
5
Service Manual
Brightness Control
ON/OFF Control
+5V DC output
Snubber
&Schottky
Feedback
and OVP
Photocoupler
PWM Control IC
LD7552B
POWER
I2C
24C04
SPI
Flash
I2C
24C02