Schematic Diagrams - ViewSonic VT2730-1M Service Manual

8. Schematic Diagrams

8.1. System Power
12 1
12V Power for normal operating
12V INPUT/ 5A
H : Power on
P101
L : Standby
1 DCR_EN
Dimming
2
3 BL_EN POWER_SW
5V_STB
4
5
6
7
8 C101 +
9
470uF/16V/LowESR C107
10
11 0.1uF
12
VCC12V
S12B-PH
5V Power for normal operating
C111
0.1uF
Tuner Power
VCC12V
L102
FB/120R/3A
C124
0.1uF
C110 + C122
0.1uF
470uF/16V/LowESR R126
3K
5V_STB
R133
10K
TU_PW_CON
Q108
1
R134 2N3904
NC R504
4.7K
SW Q109
1
R135 2N3904
10K
Panel Power
L107
NC/FB/80R/6A
VCC12V
5V_STB
L108
FB/80R/6A
R144
Lo: Off 4.7K
Hi: On
Panel_ON-P1
R145
NC
ViewSonic Corporation
L101
FB/80R/6A
VCC12V
3.3V_STB
I101 AP9435GM/NC
1
S D
2
S D
C102 3
S D
R501 R106 R105 0.1uF/NC
4
G D
4.7K NC 10K/NC
R110 R109
0R SW 1 Q101 82K/NC
2N3904/NC C105
R502 NC/0.1uF
1 Q103 4.7K/NC
R111 NC/2N3904 C106
NC/4.7K C108
NC/0.1uF 0.1uF/NC
5V_STB
I102 AP9435GM
1
S D
2
S D
3
S D
R117 R116
4
G D
NC 10K C112
0.1uF
R118
SW 1 Q105 82K
2N3904 C113
R503 NC/0.1uF
4.7K
C116
0.1uF
I104
AP1534
L103 NC
4 5
VCC OUTPUT
L104 22uH/SMD
3 6
OCSET OUTPUT
2 7
EN VSS
R127
100K 1 8 D101
FB VSS
C131
SR36 0.1uF
R130
6.49K/1%
R131 C132
10K 0.1uF R132
1.21K/1%
PANEL-VCC
I107 AP9435GM
VPANEL_IN
1 8
S D
2 7
S D
C138 3 6
S D
0.1uF
4 5
G D
R138 + C140
10K C139 R139
0.1uF 2.2K 10uF/16V
R142 R140
NC 82K
C146
Q110 NC/0.1uF For T7
1
2N3904
<100
1 Q111
NC/2N3904 R518
NC mS
C150
NC/0.1uF
+12V_AMP
R102 10K
5V_STB
8 R103 0R
Dimming
7
6 R104
NC
5
+
R107 Q102 1
C103 C104 NC 2N3904
NC NC R108
4.7K
VCC12V
R112 10K
high turn on
5V_STB
BL_EN R114 NC R505
15K
R113
0R Q104 1
2N3904
C109 R115
0.1uF 4.7K
5V_2
R506
5.6K
8
7
6
5
5V_STB 3.3V_STB
R122 R123
NC NC
DCR_EN
R125
1K
Q107 1 DCR
NC R507
C120 NC
NC
5V_DTV C121
NC
+
C128
220uF/16V/LowESR
1.3V Core Power
5V_2 L109
FB/80R/6A
5V_STB
L111
NC/FB/600R/1.5A
VCC5V_IN
R141
3K
+ C144
0.1uF
C141
220uF/16V/LowESR
C147
0.1uF
65
POWER_SW
POWER_SW
DCR
DCR
ADJ_PWM
ADJ_PWM
ON_PBACK
ON_PBACK
TU_PW_CON
TU_PW_CON 10
ADJ_PWM Panel_ON-P1
ADJ_PWM 4 Panel_ON-P1
3.3V Stand-by Power
5V_STB 3.3V_STB
I103
1117-ADJ
3 2
VIN VOUT
1 4
ADJ TAB
R121
VCC3.3V_ADJ1 110/1%
C117 R124
ON_PBACK 4
0.1uF 182/1%
3.3V normal operating
5V_2 3.3V_2
I105
1084-ADJ
3 2
VIN VOUT
1 4
ADJ TAB
R128
VCC3.3V_ADJ2 110/1%
C129 R129
0.1uF 182/1%
VCC1.8V for DDR2 Power
I133
1117-ADJ
3 2
VIN VOUT
1 4
ADJ TAB
VCC1.8V
L105 I106
FB/600R/1.5A NC/1084-ADJ
3 2
3.3V_2 VIN VOUT
1 4
3.3V_STB ADJ TAB
L106
NC/FB/600R/1.5A
R136 C134
VCC1.8V_ADJ 200/1% 0.1uF
R137
R1
C136 90.9/1%
0.1uF
R2
Vout=Vref*(1+R2/R1)+Iadj*R2
Vref=1.25V
L110 NC
I108 L112
AP1534 22uH/SMD
measure current
4 5 VCC1.2V_OUT
VCC OUTPUT
VCC5V_OCSET
3 6
OCSET OUTPUT
R143 +
100K VCC5V_EN D102
2 7
EN VSS
SR36 C142 C143
100uF/16V 100uF/16V
1 8
FB VSS
C148
0.1uF R146
RA
VCC1.2V_FB 1.21K/1%
Vout=VFB*(1+RA/RB)
R147
RB
1.82K/1%
VFB=0.8V
RB=0.7K~5Kohm
Confidential - Do Not Copy
4
4
4
4
4
+
C118 C115
0.1uF 220uF/16V/LowESR
C126
+
C130 470uF/16V/LowESR
0.1uF
+
C133
220uF/16V/LowESR
VCC1.3V
+
C145
0.1uF
VT2730-1M