Norcent Norcent LT2725, Service Manual, Page: 35 / 123

27’’ LCD TV Color Monitor Norcent LT2725
35
9. Schematic Diagram
9.1 Main Board
I2C0CLK 6,12
TU_SDATA
C711
0.1uF
R706 47 1/16W
L707 1.8uH
* Do notinstall.
VCC5_0_T2
C712
22pF
R710 47 1/16W
TU_DATA
TU_SCLK 3
TP700
1
VCC5_0_T2
R708 47K
TV1_CVBS 9
TU_SDA
+ C731
470uF/16V
C704
0.01uF
TU_SDATA 3
I2C0CLK
TU_VALID
R725 10K 1/16W
SIF
C703
47pF
D
Page 02 - Tuner and Demodulator
B
2 19 Wednesday, May 17, 2006
715T1961-
Title
Size Document Number Rev
Date: Sheet of
C714
NC/ 1pF
C710
0.01uF
VCC5_0
FB705 600 OHM
1 2
+ C724
10uF/16V
R712 47 1/16W
C737
0.1uF
FB703 600 OHM
1 2
VCC3V3_DM
C727
47pF
R713 2K
R719
1M
R703
47 1/16W
TU_SCLK
BCLK
OREN
Demodulator
U701A
CAS-220/CS
97
96
94
93
36
39
40
41
43
44
48
49
29
28
4
10
14
21
25
27
31
38
42
47
32
8
2
34
24
26
50
51
52
54
56
57
66
65
64
63
11
12
89
90
100
1
58
59
20
19
16
18
13
61
80
79
71
72
67
68
AIN1_P
AIN1_N
AIN2_P
AIN2_N
D_OUT0
D_OUT1
D_OUT2
D_OUT3
D_OUT4
D_OUT5
D_OUT6
D_OUT7
D_VALID
D_CLK
D_IN0
D_IN1
D_IN2
D_IN3
D_IN4
D_IN5
D_IN6
D_IN7
D_IN8
D_IN9
D_FAIL
SCAN_MODE
SCAN_EN
D_SOP
STAT0
STAT1
STAT2
STAT3
STAT4
STAT5
STAT6
STAT7
AU_CLK
AU_SD
AU_MCLK
AU_WS
IF_AGC
RF_AGC
AIN_OOB_P
AIN_OOB_N
PARAM0
PARAM1
PARAM2
PARAM3
SDA_I2C
SCL_I2C
TU_SDA
TU_SCL
I2C_ADDR
RST
XTI
XTO
LO_OUTP
LO_OUTN
CRX
DRX
SIF
U702
UPC3218GV
1
2
3
4
5
6
7
8
Vcc
IN1
IN2
VAGC
GND
OUT1
OUT2
GND
C734
0.1uF
FB706 600 OHM
I2C0DATA
I2C0DATA
R717
2K
C716
0.001uF
R723
68
R704 47 1/16W
C722
22pF
C701
0.01uF
FB704 600 OHM
1 2
C736
0.001uF
C719
0.01uF
+ C733
470uF/16V
VCC5_0_T2
TU_SDA
TU_DATA 14
R715 3.9K
C723
22pF
OREN_RST 3
R720
68
+ C732
470uF/16V
C726
560pF
I2C0CLK
R716
NC/ 10K
LRCLK
C718
0.01uF
R707 47 1/16W
FB701 600 OHM
X701
25MHz
C735
0.001uF
VCC5_0
FB702
600 OHM
1 2
C713
22pF
VCC5_0
I2C0DATA 6,12
R721 100
C728
47pF
VCC3V3_DM
L706
1uH
C721
0.01uF
R709 10K 1/16W
R701
100
TP701
1
IF_AGC
IF
Filter
SF701 X6941D
1
2
3
4
5
INPUT
INPUT
GND
OUTPUT
OUTPUT
Q701
BFR93A
TU_SCK
TU701
TUNER
13
14
15
16
1 2 9 6 5 7 3 10 11 12 4 8
GND
GND
GND
GND
RF AGC AGC out AUDIO SCL SDA IF out +5V CVBS FM
IF
SIF VT +5V
R702 100
C717
0.1uF
C729
82pF
VCC5_0_T1
C725
0.0015uF
L701
220nH
TU_VALID 3
IF_AGC
C720
0.01uF
L710 330nH
C707
0.1uF
LRCLK 8,14
C706 0.1uF
C730
22pF
C709
0.01uF
C708
0.001uF
TU_FRAME
Tuner / Demodulator
R718
680
VCC3V3_DM
TU_FRAME 3
VCC5_0_T1
C715
0.1uF
R722
2K
TU_SCK
L711 330nH
C705
0.1uF
R714 10K 1/16W
R705 47 1/16W
C702
56pF
BCLK 8,14
R711 47 1/16W