Schematic Diagram; Main Board - Norcent LT2725 Service Manual

27'' LCD TV Color Monitor

9. Schematic Diagram

9.1 Main Board

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