Service Manual
12
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
Fig.4
2.2.2) AC Input and EMI Filter:(fig.5)
Fig.5
CN850 is a connector for connecting AC Power. F850 is a fuse to protect
all the circuit .AC Input voltage is from 90V to 264V. R891, R892, R893 and
R894 are joined between two inputting main circuit to discharge electric
energy to prevent man from shock. L851 and L852 are common mode chock
to filter EMI common mode noise. C850 , C851 and C885,C886 Y-CAP, and
C852 & C853 are X-CAP used for reduce EMI noise.
2.2.3)High Voltage to Low Voltage Control Circuit:(fig.6)
Содержание 2209WA - UltraSharp - 22" LCD Monitor
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Страница 81: ...Service Manual 80 Attachment 3 PCB Layout power inverter bd inverter board Top Layer Bottom Layer ...
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