Service Manual
5
Chapter 3- CIRCUIT THEORY
Block Diagram
Dell 2209WA consists of a main body and a stand (base). The main body
contains a Innolux LCD module with 6 CCFL lamps, There are 4pcs PCBA
in this monitor, one is power & interface & Audio board , one is invert board ,
one is keypad which is OSD control, and one is USB stretch board located
on the right side back cover.. The block diagram is shown as below.
(fig.1
)
AC Line Filter
PFC
control
Rectifier and
filter circuit
+12V DC output
Feedback
Brightness Control
Power saving
circuit
+5V DC output
Standby
Power PWM
circuit
Contol Signal
From/TO IF Board
Main Power
PWM circuit
Rectifier and
filter circuit
AC Input
90V~264V
To Inverter
AUDIO Detect
PFC+PWM
controller
IC SG6901
Feedback
control
(OPTION)
+24V /+12V/+5V
OVP circuit
Power Saving control
PFC boost
circuit
Transfor and
Isolate
(Standby Power
transformer)
DC Jack
AUDIO ON/OFF Control
Bulk
E-CAP
24V ON/OFF
circuit
Feedback
control
CCFL ON/OFF Control
Start up
circuit
24V ON/OFF Control
Rectifier&
Filter
Circuit
GND
PWM
control
+24V DC output
to Inverter
+5V DC output
PWM
control
Transfor and
Isolate
(Main Power
transformer)
12V DC
regulator and
ON/OFF circuit
Standby
controller
IC LD7575
POWER
Содержание 2209WA - UltraSharp - 22" LCD Monitor
Страница 1: ...Service Manual 0 Service Manual LCD Monitor 2209WA ...
Страница 25: ...Service Manual 24 8 Key Parts Pin Assignments 8 1 U105 TSUMU58EHJ LF ...
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Страница 32: ...Service Manual 31 Chapter 4 Disassembly Assembly 1 Exploded Diagram ...
Страница 36: ...Service Manual 35 Note 1 The arrows point out the direction of assembly ...
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Страница 81: ...Service Manual 80 Attachment 3 PCB Layout power inverter bd inverter board Top Layer Bottom Layer ...
Страница 82: ...Service Manual 81 Main board Top Layer ...
Страница 83: ...Service Manual 82 Bottom Layer ...
Страница 84: ...Service Manual 83 Keypad USB convert board ...
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