BenQ VL3735 Service Manual page 109

interface. It can be provided 4 S-video/composite inputs, 3 composite inputs and 3
S-video/composite outputs. We use it to multiplex AV1~4 and TV signals to output to main
board.
R242 5.6K J
1 DVI_AU_L
R243 5.6K J
1 DVI_AU_R
R244 R245
NM_100K NM_100K
R87 NC
R88 0
4 TV_CVBS
R89 NC
C71 C72
NC NC
IN1=AV-REAR
3 REARAV_CVBS
3 REARAV_AUD_L
3 REARAV_Y
3 REARAV_AUD_R
3 REARAV_C
3 REARAV_SDET
R106
75 R107 R108
75 75
C78
0.01U K
IN2=SCART 2 (Y/C)
2 AUD_SC2_L
2 SC2_S_Y
2 AUD_SC2_R
2 SC2_S_C
R121 NM_22K
1,2 SC2_SWITCH
R122
75 R123 R124
NM_12K J 75
C88
IN3=SCART 1 0.01U K
2 SC1_CVBS
2 AUD_SC1_L
2 AUD_SC1_R
R130 NM_22K
1,2 SC1_SWITCH
R131 R132
NM_12K J 75
IN4=AV-SIDE
1 SIDEAV_CVBS
1 SIDEAV_AUD_L
1 SIDEAV_S_Y
1 SIDEAV_AUD_R
1 SIDEAV_S_C
1 SIDEAV_SDET
R147 R148
75 75
C98
0.01U K
C231 1U K
C232 1U K
C68 NC
C69 1U K
C70 NC
R92 220 C73 1U K
R94 5.6K J C74 1U K
R100 220 C75 1U K
R103 5.6K J C76 1U K
R104 220 C77 0.01U K
R105 1K
R109 R110
NC NC 1
V1
2
LV1
3
Y1
4
RV1
R112 5.6K J C80 1U K
5
C1
R113 220 C81 1U K
6
S2-1
R118 5.6K J C83 1U K
7
S-1
R120 220 C84 0.01U K
8
V2
9
LV2
0 ~ 1.3 V 4:3
10
1.3 ~ 2.5 V 4:3 letter-box
Y2
2.5 ~ m ore 16:9
11
RV2
R125 R126
NC NC 12
C2
13
S2-2
14
S-2
R127 220 C89 1U K 15
V3
R128 5.6K J C90 1U K 16
LV3
17
Y3
R129 5.6K J C91 1U K 18
RV3
19
C3
0 ~ 1.3 V 4:3
1.3 ~ 2.5 V 4:3 letter-box
2.5 ~ m ore 16:9
R133 R134
NC NC
R137 220 C92 1U K
R139 5.6K J C93 1U K
R141 220 C94 1U K
R142 5.6K J C95 1U K
R144 220 C97 0.01U K
R146 1K
R149 R150 R151 S-1, S-2, S-3, S-4 PINS:
75 NC NC
(pull-high to 5V by 100k Ohm inside CXA2069
High: >3.5V, composite is selected
Low: <3.5V, S-video is selected )
9V_MUXOUT
pin voltage
(push-pull)
= 4.5V
R82 47 B Q8
2N3904S
R83 390
R84 R85 R86
10K NC 180
pin voltage
9V_MUXOUT
(push-pull)
= 3.3V
R90 47 B Q9
2N3904S
R93 390
R95 R96 R97
10K NC 180
MUX_AUD_R 6
MUX_AUD_L 6
51
CIN1
50
BIAS
49 + C79
Y IN1
48 22U 16V
MUTE
47
COUT2
46
TRAP2
45
ROUT2
U4 44
V/Y OUT2
CXA2069Q 43
LOUT2
(IIC ADDRESS: 90H 42
Vcc
ADR: OPEN) 41
VOUT3
40
ROUT3
39
Y OUT3
38
LOUT3
37
COUT3
36
DC OUT
35
AGND
34
SDA
33
SCL
R138
R140
C96 1U K R143 220
109
+9V
L23
C66 Z220
+ C67
0.01U K
22U 16V
MUX_S_C 1
To Video Decoder SAA7117
9V_MUXOUT
pin voltage
(emitter follower)
= 3.3V
R91 47 B Q10
2N3904S
MUX_S_Y 1
R98 390
R101 R99
10K NC
pin voltage
9V_MUXOUT 9V_MUXOUT
(push-pull)
= 3.9V
VOUT2 B Q11
2N3904S
R111 47
B Q12
2N3904S
R114
10K R115 R117
NC 1K R119
390
+9V
L24
Z220
+ C85 C87
100U 16V
0.01U K
+5VA
R135 R136
10K 10K
100
SDA_CONN 1,4,6
AV SW ITCH
100
SCL_CONN 1,4,6
IN5=SCART 3
DTV_CVBS 1
R145
75
MUX_CVBS 1
R102
180
C82
470U M
R116
75
1 2
SC2_VOUT 2