BenQ G2010W, Service Manual

Page: 32 / 41

32
Inverter board
D507
BAV99
1
2
3
+16V 2,4
BRIGHTNESS 2
ON/OFF 2
C507
2.2u/16V
CN501
4100-D02
1
2
H
L
IS2
R533
6K8 1%
R531
1K8 1%
C524
2200p/50V
R521
470
D511
SN4148
VCC5V 2
R535
15
C509
3p/3KV
C526
NC
R506
1M5 3KV
C508
NC
R525
1M5 3KV
R537
10K 1%
C503
NC
C502
NC
C513
470p/50V
FB802 85 Ω
C528
3p/3KV
C520
0.1/50V
C510
1000p/50V
T502
SPW-080
1
3
4
6
7
8
CN502
4100-D02
1
2
H
L
D502
BAV99
1 2
3
D503
BAV99 1
2
3
U501
AP9971GD
6
5 4
3
7
8 1
2
R526
1M
IS2
R534
15
C
521
22
0p/
50V
op1
R530
33
R508
43K 1%
R542
200K
C519
0.1/50V
IS1
T501
SPW-080
1
3
4
6
7
8
C514
3900p/50V
R529
470
op1
D504
BAV99
1
2
3
C529
1000p/50V
R536
6K8 1%
R510
1K8 1%
5V
CN504
4100-D02
1
2
H
L
C506
10p/3KV
R522
200K
C527
3900p/50V
C501
470u/25V
R528
820 1%
IC501
INL837
1
2
3
4
5
6
7
8 9
10
11
12
13
14
15
16
DRV1
VDDA
DIM
ISEN
PID
RSTR
RT
ENA VSEN
OVPT
LCT
SSTCMP
CT
TIMER
GNDA
DRV2
R517
33
C518
0.01/50V
R538
10K 1%
D505
SN4148
IS1
D512
SN4148
R541
20K 1%
V01 3 3
Custom
BenQ G2010W
Inverter
2008-01-08
InnoLux
Document Number : SIZE :
TITLE :
DATE :
SHEET OF
Rev :
DRAW N BY :
CHECK BY :
APPRO BY :
U502
AP9971GD
6
5 4
3
7
8 1
2
R513
75K 1%
R519
1M
C
512
270p
/5
0V
R507
3M3 1%
R515
1M 1%
R539
5K1 1%
C
511
0.
04
7/
25V
D509
BAV99
1
2
3
C522
1000p/50V
R504
33
C
516
1000
p/
50V
R540
20K 1%
C515
2.2u/16V
R524
200
C531
470u/25V
C523
10p/3KV
R518
470K 1%
R527
200
CN503
4100-D02
1
2
H
L
C505
1000p/50V
D508 BAV99
1
2
3
R523
820 1%
D506
BAT54
3
2
1
C525
470p/50V
op2
C530
2200p/50V
C504
1000p/50V
R
516
60
4K 1%
5V
C517
6800p/50V
R520
100K 1%
R505
33
R512
10K
op2 R501
10K
R532
33
5.5 Circuit Operation Theory
5.5.1. Electronic Circuit Theory
Low voltage to high voltage circuit
16VDC provides the power for IC501; the control signals Brightness and ON/OFF come from I/F board. ON/OFF
signal connect to R501 to control pin1 of IC501 and makes IC501 enable. Brightness signal connect to pin3 of IC501
and regulates the panel brightness, delaying time circuit is setting by the IC501 internal , C510 is used to dump noise.
The operation frequency is determined by the external Resistor R508 and Capacitor C512,C521 connected to pin13
of IC501. BURST MODE regulated dimming frequency is determined by the external resistor R516 and capacitor
C516 connected to pin11 of IC501. C511 is used for soft start and compensation, C518, C519 are used for dump
noise.
The output drives, include DRV1, DRV2 (pins1,16 respectively) output square pulses to drive MOSFET U501, U502,
and each of U501, U502 , is consist of dual N channel MOSFET. U501,OR U502 work as Push-Pull- topology, it is
high efficient, PWM switching.
During start up, R519 senses the voltage at the transformer secondary. When OVP reaches Vense 3v Level, the output
voltage is regulated. If no current is sensed approximately 2seconds IC501 shut off.