ViewSonic VP720B Service Manual - Page 79

ViewSonic Corporation

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10. Schematic Diagrams 10.1. DC TO DC 12VCC 5VCC P101 1 2 3 4 5 6 7 8 9 C131 0.1u 5VCC 12VCC PANEL_EN ON / OFF BRIGHTNESS STANDBY VOLUME C132 NC R124 1K R125 NC 5VCC R254 1K R255 NC/0 C Q109 2N3904 B R253 4.7K 5VCC L101 CX000800000/1206 BKLT-EN C138 + 100u/16V I102 LT1117/TO223 3 VIN VOUT 2 1 ADJ/GND 4 4 I102-A1 NC/AIC1084/TO263 3 VIN VOUT 2 1 ADJ/GND 3.3VCC 1.5A Max TMDS 3V3A PLL 3V3A + C139 C140 100uF_16V 100nF E L104 FEB_1206 E VP720 R255 0ohm, Q109 R253 R254 NC VP920 R255 NC R126 1K + C133 10uF/50V 5VCC R127 1K R129 NC C Q105 2N3904 B R128 4.7K BKLT-PWM 5VCC D130 GS1B L102 CX000800000/1206 C137 + 100u/16V I105 LT1117/TO223 3 VIN VOUT 2 1 ADJ/GND 4 4 I105-A1 NC/AIC1084/TO252 3 VIN VOUT 2 1 ADJ/GND 2.5VCC 0.8A Max DDR 2.5VCC + C141 C142 100uF_16V 100nF L105 NC R134 4.7K R135 10k 2 Q102 AP2305 PANEL_POWER R132 10K C134 2200PF C135 2200PF R133 200 3 Q101 1 2N3904 5VCC D131 GS1B D132 GS1B C136 + 100u/16V I101 LT1117/TO223 3 VIN VOUT 2 1 ADJ/GND 4 4 I101-A1 NC/AIC1084/TO263 3 VIN VOUT 2 1 ADJ/GND 1.8VCC + C143 ADC 1V8A RTD CORE C144 POWER 100uF_16V 100nF MCU_VCC VGA_5V BUS_POWER 5VCC D101 1N4148 1 2 D102 1N4148 Q103 2N3906 1 22 3 D103 NC/1N4148 1 2 21 R136 1K D125 1N4148 1 D123 D124 Q104 1N4148/NC 1N4148/NC 2N3906 1 21 22 3 L107 FEB_1206 C145 NC + C146 47uF_16V 3.3VCC R256 0 1 R138 1.5K ViewSonic Corporation Model DC Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy 76 VP720-1_VP720b-1

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10. Schematic Diagrams
10.1.
DC TO DC
RTD CORE
POWER
ADC 1V8A
PLL 3V3A
TMDS 3V3A
0.8A Max
DDR 2.5VCC
1.5A Max
VP720 R255 0ohm, Q109 R253 R254 NC
VP920 R255 NC
BRIGHTNESS
ON / OFF
VGA_5V
BUS_POWER
PANEL_EN
PANEL_POWER
BKLT-PWM
STANDBY
VOLUME
BKLT-EN
MCU_VCC
12VCC
5VCC
5VCC
3.3VCC
1.8VCC
2.5VCC
5VCC
5VCC
12VCC
5VCC
5VCC
5VCC
5VCC
3.3VCC
D101
1N4148
1
2
Q102
AP2305
R129
NC
D130
GS1B
C134
2200PF
L107
FEB_1206
I101-A1
NC/AIC1084/TO263
1
2
3
ADJ/GND
VOUT
VIN
R136
1K
R127
1K
R256
0
D102
1N4148
1
2
Q105
2N3904
C
B
E
D123
1N4148/NC
1
2
R125
NC
C131
0.1u
D103
NC/1N4148
1
2
R138
1.5K
I105-A1
NC/AIC1084/TO252
1
2
3
ADJ/GND
VOUT
VIN
R128
4.7K
R135
10k
R132
10K
L105
NC
D132
GS1B
R255
NC/0
C132
NC
L104
FEB_1206
+
C136
100u/16V
+
C133
10uF/50V
D124
1N4148/NC
1
2
C135
2200PF
R124
1K
L102
CX000800000/1206
D131
GS1B
+
C138
100u/16V
Q101
2N3904
1
2
3
R126
1K
P101
9
8
7
6
5
4
3
2
1
C140
100nF
+
C146
47uF_16V
Q104
2N3906
1
2
3
C145
NC
C142
100nF
I105
LT1117/TO223
1
2
3
4
ADJ/GND
VOUT
VIN
4
+
C141
100uF_16V
+
C137
100u/16V
D125
1N4148
1
2
L101
CX000800000/1206
R134
4.7K
R254
1K
C144
100nF
Q109
2N3904
C
B
E
I102-A1
NC/AIC1084/TO263
1
2
3
ADJ/GND
VOUT
VIN
+
C143
100uF_16V
R253
4.7K
R133
200
I102
LT1117/TO223
1
2
3
4
ADJ/GND
VOUT
VIN
4
I101
LT1117/TO223
1
2
3
4
ADJ/GND
VOUT
VIN
4
+
C139
100uF_16V
Q103
2N3906
1
2
3
ViewSonic Corporation
Confidential – Do Not Copy
VP720-1_VP720b-1
76
Model
Title
Date
Rev:
ViewSonic Corporation
DC