Power Board - BenQ E2220HD Service Manual

21.5" LCD Color Monitor

Power Board

Input AC Source
EMI Filter
110v / 60 Hz ~
Circuit
240v / 50 Hz
ON / OFF Control Signal
( 5v: on / 0v:off )
Dimming Control Signal
(Burst model Signal )
Inrush
Rectification
Prevention
Rectification
Switching Circuit
( PWM Control IC
& MOSFET )
PWM Control Circuit Driver Circuit
( PWM Control IC _O2_TA9687 ) ( Full Bridge )
Abnormal Protect
Control Circuit
Dimming
Feedback Control
Control
Circuit
Circuit
B+
Main
Transformer
Diode Rectifier
and Filter Circuit
Diode Rectifier
and Filter Circuit
Feedback
Control
Circuit
DC To AC
Transformer
( EEL-19 * 1 pcs )
54
BenQ E2220HD
Output (+5V) To Main Board &
AUDIO
Fuse For OLP
Output (+16V) For USB*4Port
Adapter Block Circuit
CCFL Lamp * 4 pcs
Inverter Block Circuit