Schematic Diagrams - ViewSonic VTMS2431 Service Manual

8. Schematic Diagrams

8.1. System Power
9 1
L105 40uH DIP
12V
10 12V
L102 40uH DIP
C109
C108 +
100nF/0603
1500u/16V LESR
P101
1500u/16V LESR
1
2
ADJPWMA
3
4
5
BKLON
6
L123 NC/600uH DIP L103
7
8
9
L104
L101
DUAL BEAD 100R C101 +
1500u/16V LESR
L120 600R/1.5A 0805
12V
C172
+ + C160 R180
C161
NC 470u/16V/LESR 100nF NC
R181
NC
ONLY C617 C142 C141ARE 50V OTHER IS 16V
CHIP CAP
4 PANEL-ON/OFF-GPIO11
ViewSonic Corporation
R103 NC
VCC5V-STDPF 4
VCC5V-ST
VCC5V-STDPF
+ C107 R102 0R
R106 100R
ADJPWMA
0 ~ 3V3
220u/16V LESR
Q102
2
VCC5V-ST
C103 + C102 R104 3
1
VCC5V-ST 4,6,7,8,12
NC NC NC
R105
NC/3904
NC
C110 + C111
NC
R107 NC
80R 0805 6A
VCC5V-ST
5VAMP 9,10
BKLON R108 0R
5VAMP
80R 0805 6A R139 1K Q101
2
R101
3
C112
1
NC
NC/3904
C115 + C114 R109
100nF NC 4.7K
measure current L121 NC
L122 22uF/15uF
C162 100nF
C166
100K 1% 0603
R182 R183 NC
D136 C165 C163
+
6 1
SW BST SR36
47u/16V 100nF 100K 1% 0603
5 2
IN GND
4 3
EN FB
I109 MP2359DJ/TSOT23-6
R184 4K75 1% 0603
R185
4K75 1% 0603
L114 80R 0805 6A
VCC5V-ST
VCC5V-ST
R129 C171
10K 100nF
R130
100k
R131
4.7K Q105
VCC5V-ST 1
MMBT3904
C169
R141 NC/0805
NC
R133
PANEL-ON/OFF-GPIO11 4.7K Q106
1
MMBT3904
R135
10K 1
VCC5V-ST
R142
NC
R136
POWER-ON/OFF-GPIO44 10K 1 Q108
4,10 POWER-ON/OFF-GPIO44
MMBT3904
BRI_ADJ-PWM2 4
high turn on
0R
VBLCTRL-GPIO12
VBLCTRL-GPIO12 4
5VIF
5VIF 3
VCC5V-ST
C164 C167
+
100nF 220u/16V LESR R187
Q120
R186 10K 10K Q121
POWER-ON/OFF-GPIO44 1 R188 4.7K
B
SOT
3 1
C B
23 SOT
2
E
2 23
E
MMBT3904
NC/MMBT3904
R189 4.7K
1.2V Core Power
VCC5V-ST
L110
600R/1.5A 0805
VCC5V_IN
R123
3K 0603/2.2K VCC5V_OCSET
C133 R124
+C131
100nF C136 100K 0603 VCC5V_EN
47u/16V 100nF
C139
100nF
R128
1.62K 1% 0603
I107
measure current
STM4953
1 8 PANEL-VCC 11
S2 D2
2 7
PANEL-VCC
G2 D2
3 6
S1 D1 +5V_General
4 5
G1 D1 +5V_General 2,3,4,12
R132 C170 measure current
10K 100nF
R134
4.7K
Q107
MMBT3904
68
3.3V Stand-by Power
VCC3.3V-ST
I103 1084-3.3
3 2
VIN VOUT VCC3.3V-ST
VCC5V-ST
1 4
ADJ TAB
C116
+
C118
100nF R110 220u/16V LESR
+ C119 VCC3.3V_ADJ NC
R111
10u/16V 0R
2.5V Power
VCC2.5V-ST
I104 1084-ADJ
600R/1.5A 0805 D133 GS1B
VCC2.5V-ST
3 2
VIN VOUT
L108
VCC5V-ST
L109 NC
1 4
+5V_General ADJ TAB
+ C127
R117 220u/16V LESR
C130 VCC2.5V_ADJ 100R 1% 0603
+ C129 100nF R120 R1
110R 1% 0603
10u/16V R2
Vout=Vref*(1+R2/R1)+Iadj*R2
Vref=1.25V
3
C
L124 NC
I105 L111
measure current VCC1.2V-ST
AP1533/AP1534 22uH/2.9A
4 5 VCC1.2V_OUT
VCC OUTPUT
3 6
OCSET OUTPUT
D102 C132 C134 C135
+ +
2 7 100nF
EN VSS SR36
220u/16V LESR 1u/50V
1 8
FB VSS
R126
RA
VCC1.2V_FB 1K 1% 0603
Vout=VFB*(1+RA/RB)
RB
VFB=0.8V
RB=0.7K~5Kohm
Confidential - Do Not Copy
4,8,10
C117
100nF
4,5
C128
100nF
VCC1.2V-ST 4
VTMS2431