BBK LT1914S Service Manual page 27

5
VIDEO
XP13 XP13
GND1 3 1 SIG1 Video R4 R4 20R/1% 20R/1% C6 C6
SIG2
2
4 SIG3
CHANGE
GND2 SIG4 SCART2_IN_L
7 5
SCART2_IN_L 5
6 SIG5
SIG6
8
GND3 11 9 SIG7 SCART2_IN_R
SCART2_IN_R 5
SIG8
10
S_VIDEO/VGA/HDTV AUDIO
GND COMPONENT COMPONENT
D
XP1 XP1
YC_C R2 R2 20R/1% 20R/1% C2 C2 0.1uF 0.1uF
1
2
1 1 3 3
YC_Y R1 R1 20R/1% 20R/1% C1 C1 0.1uF 0.1uF
3
2 2 4 4 4
5
6
SVIDEO JACK SVIDEO JACK
GND
SCART 1
ADD XP5
XP5 XP5
R21 R21 0R 0R
21
20
Video_Out
19
18
GND
17
16 SCRT1-FB
15
14
13
12
11
10
9
8
7
SCART1_IN_L
6
5
C 4
3
SCART1_IN_R
2
1
GND
SCART1_OUT_R
SCART1_OUT_R 5
SCART1_OUT_L
SCART1_OUT_L 5
V45 V45
BAV99/SOT BAV99/SOT
+5V
SC-FSEL
DESCRIPTION
LEVEL
B
0V - 2.0V SCART ABSENT
4.5V - 7.0V SCART PRESENT
16:9 INPUT
9.5V - 12.0V SCART PRESENT
4:3 INPUT
XP24 XP24
ADD
XP25 XP25
1 SCART2_IN_L
SCART2_IN_R
2 6
Y
3 5
4 Video 4
Pb
5 3
YC_C
6 2
Pr
7 1
YC_Y
8
CON6 CON6
GND
CON8 CON8 GND
XP23 XP23
FSEL_SC
1
FSEL_SC {3}
SCRT1-FB
2
SCRT1-FB {3}
3
A3_E
4
5
B3_E
6
A 7
8 C3_E
CON8 CON8
XP26 XP26
GND
1 SCART1_IN_L
SCART1_IN_L {5}
SCART1_OUT_L
2
SCART1_OUT_L {5}
SCART1_IN_R
3
SCART1_IN_R {5}
SCART1_OUT_R
4
SCART1_OUT_R {5}
5
Video_Out
6
7
SV3_S
8
CON8 CON8
GND
5
4
0.1uF 0.1uF +5V +5V +5V
SV1 3
GND
V47 V47 V48 V48 V49 V49
BAV99/SOT BAV99/SOT BAV99/SOT BAV99/SOT BAV99/SOT BAV99/SOT
A4 3
R299 R299 R300 R300 R301 R301
VD50 VD50 75R/1% 75R/1% VD51 VD51 75R/1% 75R/1% VD52 VD52 75R/1% 75R/1%
SV2 3
ADD
GND GND GND GND GND GND
+5V
R18 R18 GND
V30 V30 75R 75R
BAV99/SOT BAV99/SOT
SV3_S
SCRT1-FB
+5V
GND
R149 R149
R27 R27 GND
V31 V31 75R 75R
VD53 VD53
ESD-0603 ESD-0603 10K 10K
BAV99/SOT BAV99/SOT
C4_S
ADD
FSEL_SC
FSEL_SC 3
SCART1_IN_L 5
XP21 XP21
GND_P 3
SCART1_IN_R 5
R41 R41 GND GND_Pb
6
75R 75R
GND_Pr
9
SCART_B C3_E
GND
+5V
R51 R51 GND
V46 V46 75R 75R
CHANGE
BAV99/SOT BAV99/SOT
B3_E
+5V
XP12 XP12
R61 R61 GND
V32 V32 75R 75R
BAV99/SOT BAV99/SOT
CON3 CON3
A3_E
CHANG NET
V33 V33
VGA_5V BAT54C BAT54C +5V
1 2
A1 A1 A2 A2
C C
C63 C63
R64 R64 R65 R65
10K 10K 10K 10K
0.1uF 0.1uF
XP14 XP14
GND R68 R68 100R 100R
N2 N2
1 8
A0 VCC
2 7
A1 WP
3 6
A2 SCL
4 5
GND SDA
R71 R71 100R 100R
M24C02 M24C02
R-SOIC08N-1.270-6.00-HX R-SOIC08N-1.270-6.00-HX
GND GND
VD46 VD46 VD47 VD47
GND GND
R79 R79
510R 510R
GND
4
3
ANALOG INPUT TO MUX SWITCHING
1 2 3
A GRAPHIC_RED+ HD_Pr SCART_RED_C
B GRAPHIC_GREEN+ HD_Y SCART_GREEN
C GRAPHIC_BLUE+ HD_Pb SCART_BLUE
SV VIDEO Y/C_Y SCART_CVBS_Y
RET
+5V
+5V
C311 C311 C312 C312
0.1uF 0.1uF 0.1uF 0.1uF
R6 R6 R7 R7
470R 470R 27K 27K
R8 R8 GND
V2 V2 2
100R 100R
2N3906 2N3906
R9 R9 100R 100R
2Vp-p V3 V3
R11 R11 2N3904 2N3904
Video_Out R12 R12
680R 680R
62R 62R R14 R14
XP18 XP18
R13 R13 12K 12K
220R 220R
6
5
4
3
SCRT1-FB 3
GND 2
1
GND +5V GND +5V GND +5V
C75 C75 C76 C76 C77 C77
CONN RCPT 6 CONN RCPT 6
0.1uF 0.1uF V41 V41 V42 V42 0.1uF 0.1uF V43 V43
HDTV 0.1uF 0.1uF
BAV99/SOT BAV99/SOT BAV99/SOT BAV99/SOT BAV99/SOT BAV99/SOT CHANG
C99 C99
1 Y Y HD_Y
Y C91 C91 4.7uF 4.7uF
2
1uF 1uF
Pb Pb C98 C98 1uF 1uF HD_Pb
4
5 Pb
Pr Pr C107 1uF C107 1uF HD_Pr
7
Pr
8
R84 R84
COMPONENT COMPONENT R83 R83
R82 R82 75R 1% 75R 1% 75R 1% 75R 1% C91、C98、C107改为0欧姆
75R 1% 75R 1%
GND GND GND
+5V
HDTV Audio
3 R85 R85 0R 0R + + C60 C60
SCART2_IN_L 5
R86 R86 0R 0R 47uF/16V 47uF/16V
2
SCART2_IN_R 5
1 C57 C57 0.1uF 0.1uF
R87 R87 0R 0R
SCART3_IN_R 5
R88 R88 0R 0R
SCART3_IN_L 5
GND
GND
VGA_SDA 3
VGA_SCL 3
VGA_5V
R66 R66
11 1 VGA_R
GND
6
VGA_G
12 2
R69 R69
7
VGA_B
13 3
8 75R/1% 75R/1%
14 4
GND
9
15 5
/VGACON R72 R72
10
75-ohm terminating 75R/1% 75R/1%
DB15 DB15
resistor very close to
GND
the VGA conn.
GND
Pins 6/7/8 are R/G/B
return lines resp.
N3A N3A
GND
1
22R 22R
R73 R73
22R 22R N3C N3C
R77 R77
5
R80 R80 C73 C73 C74 C74
510R 510R 22pF 22pF 22pF 22pF
VD48 VD48 VD49 VD49
GND
GND GND
CHANG
3
2
4
SV3_S R22 R22 20R/1% 20R/1%
Y/C_C
C4_S R26 R26 20R/1% 20R/1%
C3_E
R28 R28 20R/1% 20R/1%
SCART_FB
B3_E R31 R31 20R/1% 20R/1%
TUNER_CVBS1
A3_E R34 R34 20R/1% 20R/1%
CHANG NET
R39 R53 R59由20R改为56R
56R/1% 56R/1%
C29 C29 0.1uF 0.1uF
C313 C313 C314 C314 C315 C315 C316 C316 C317 C317 C318 C318 R39 R39
GND
0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 56R/1% 56R/1%
C32 C32 0.1uF 0.1uF
R47 R47
GND
56R/1% 56R/1%
C47 C47 0.1uF 0.1uF
R53 R53
GND
56R/1% 56R/1%
C52 C52 0.1uF 0.1uF
C12 C12
R59 R59
10uF/16V 10uF/16V
0.5Vp-p GND
VOUT 3
XP20 XP20
NC 读卡器
C307 1uF C307 1uF RC_Pr A3_S IR0
1
2
3
C308 1uF C308 1uF RC_Pb C3_S
CHANG
C309 C309
GND
RC_Y B3_S
4.7uF 4.7uF +5V
R261 R261 R262 R262 R263 R263
GND 75R 75R 75R 75R 75R 75R NC
+5V
R244 R244 R245 R245 R246 R246
22K 22K 22K 22K 22K 22K
GND R240 R240
R302 R302 R303 R303 R304 R304
22K 22K 22K 22K 22K 22K R241 R241
R242 R242
R249 R249
R305 R305 R306 R306 R307 R307 12K 12K +5V
12K 12K 12K 12K 12K 12K
R247 R247 R248 R248
2
12K 12K 12K 12K
PI5V330 PI5V330
N23 N23
GND GND GND
HD_Y GND
2
S1a
RC_Y
3
S2a
HD_Pb
5
S1b
RC_Pb
6
S2b
HD_Pr 11
S1c
RC_Pr
10
S2c
14
S1d
13
S2d
R243 100R R243 100R
RC_PW
1
IN
15
#EN
C61 C61
DEL C58 C59
0.1uF 0.1uF
GND
20R/1% 20R/1% C62 C62
R63 R63
0.1uF 0.1uF
RED+
A1 3
75R/1% 75R/1% 20R/1% 20R/1% C65 C65
R67 R67
0.1uF 0.1uF
GREEN+
B1 3
20R/1% 20R/1% C66 C66
R70 R70
0.1uF 0.1uF
BLUE+
C1 3
+3.3V_LBADC
R251 R251 C68 C68
NC
0R 0R VCC
0.1uF 0.1uF
N3B N3B
74LCX14/SO 74LCX14/SO 74LCX14/SO 74LCX14/SO GND
2 3 4
AIP_RAW_VS 3
100R 100R
R74 R74
N3D N3D
74LCX14/SO 74LCX14/SO 74LCX14/SO 74LCX14/SO
6 9 8
AIP_RAW_HS_CS
100R 100R
R78 R78
R252 0R R252 0R NC
Title Title Title
Size Size Size
Date: Date: Date:
2
1
C17 C17 0.1uF 0.1uF
SV3 3
C4 3
C21 C21 0.1uF 0.1uF
C3 3
C24 C24 0.1uF 0.1uF
B3 3
C25 C25 0.1uF 0.1uF
A3 3
D
A_RETURN
A_RET 3
B_RETURN
B_RET 3
C_RETURN
C_RET 3
D_RETURN
SV_RET 3
+5V NC
NC
R287 R287
IR0 3
10K 10K
R291 R291 1K 1K
R292 R292 10K 10K
1
RC_PW 3,5
V28 V28
2N3904 2N3904
GND
0R 0R
C
0R 0R
0R 0R
NC
FB22 FB22
1
C90 C90
0.1uF 0.1uF
GND
b2_Y
4
Da
c2_Pb
7
Db
a2_Pr a2_Pr
9
Dc
12
Dd
改电容值，
R75 R75
20R/1% 20R/1%
b2_Y C70 C70 0.1uF 0.1uF
B2 3
R76 R76
20R/1% 20R/1%
c2_Pb C71 C71 0.1uF 0.1uF
C2 3
B
R81 R81
20R/1% 20R/1%
a2_Pr C72 C72 0.1uF 0.1uF
A2 3
+5V
C64 C64
VGA_R V34 V34 0.1uF 0.1uF
BAV99/SOT BAV99/SOT
VD56 VD56
GND
GND +5V
C67 C67
VGA_G V35 V35 0.1uF 0.1uF
BAV99/SOT BAV99/SOT
VD57 VD57
GND
+5V
GND
C69 C69
VGA_B
V38 V38 0.1uF 0.1uF
BAV99/SOT BAV99/SOT
A
VD58 VD58
GND
3
GND
<Title> <Title> <Title>
Document Number Document Number Document Number Rev Rev Rev
C C C <Doc> <Doc> <Doc>
Friday, January 26, 2007 Friday, January 26, 2007 Friday, January 26, 2007 Sheet Sheet Sheet 1 1 1 of of of 6 6 6
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