Skyworth 19E57, Service Manual

Page: 39 / 64

5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
TU_SCL_INC SYS_SCL
SYS_SDA
IF-IN-
IF-IN+
TU-AGC TUAGC D_IF-AGC
VIFM
VIFP
TU-AGC
TU-AGC AGC_T
TUNER-SDA
TUNER-SCL
TU_SDA_INC
TU_SW
AGC_T
IF-IN+
IF-IN-
T
U
_
S
D
A
T
U
_
S
C
L
IF-IN+
IF-IN-
TU_SCL
TU_SDA
ANT_PC
ANT_PC
TU_SW
+3.3V_Normal +3.3V_Normal
TUNER_VCC3.3V
Tuner_VCC
TUNER_VCC3.3V/
TUNER_VCC3.3V/ TUNER_VCC3.3V/
TUNER_VCC3.3V/
TUNER_VCC3.3V/
TUNER_VCC3.3V/
AGND
AGND
AGND AGND AGND
AGND
AGND
AGND
AGND
AGND AGND AGND AGND
AGND
AGND
TUNER_VCC3.3V/
+3.3V_Normal
AGND
TUNER_VCC3.3V/
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
+5V_Normal
AGND
TAGC
SYS_SCL
SYS_SDA
IF-IN-
D_IF-AGC
IF-IN+
IF-AGC-SEL 3
VIFM
VIFP
TUNER-SCL
TUNER-SDA
R1
R3
R1 远大于 R2
R2
IF AGC Switch
R4
BPF_IN
With DTV:R823 NC
ATV only:R823 0R,Other NC
CON901
CON902
6000-C20103-0500
WITHOUT PRIOR NOTICE.
8M27 SCHEMATIC DIAGRAM (7)
THIS IS MAIN BOARD SCHEMATIC DIAGRAM,ONLY FOR REFERENCE.
SOME SPECIAL FUNCTIONS ARE OPTIONAL.IT IS SUBJECT TO CHANGE
C366 0.1u C366 0.1u
R81
NC/1K
R81
NC/1K
C841
1n 50V
C841
1n 50V
Q808
3906 Q808
3906
C842
0.1uF
C842
0.1uF
R837 68R R837 68R
C369
100PF/56PF
C369
100PF/56PF
C828
100nF
C828
100nF
C830
6.8nF
C830
6.8nF
C824
120pF 100V C824
120pF 100V
X3
NX3225GA
X3
NX3225GA
1
2
R821
100K R821
100K
Q34
NC/A03401
Q34
NC/A03401
1
3 2
D102
4100-L80000-Z300
D102
4100-L80000-Z300
C820
47nF
C820
47nF
R838 100R R838 100R
R814
100K
R814
100K
C840
1n 50V C840
1n 50V
F5
NC/150mA
F5
NC/150mA
U3
TDA18274_HLQFN48_ES1
U3
TDA18274_HLQFN48_ES1
RFVCC
1
GPIO2
3
GNDRF1
4
RFin
5
GNDRF2
6
LTO(214)
7
STO
8
CAPSmooth
9
NC
10
GPO_RFAGC_Sens
2
GNDDIG
11
AS_Scanin1
12
X
ta
ll
n
S
e
l_
S
c
a
n
in
2
1
3
S
C
L
1
4
S
D
A
_
A
s
y
n
c
D
is
a
b
le
1
5
G
N
D
S
Y
N
T
H
2
0
G
N
D
D
IG
1
6
X
T
A
L
1
7
X
T
A
L
n
1
8
C
a
p
R
e
g
V
c
o
1
9
V
t
2
1
C
P
2
2
V
C
C
S
y
n
th
2
3
X
T
o
u
t1
2
4
XTout2
25
IF
28
ScanOut1
26
IFN
27
GNDIF1
29
VCCIF
30
VIFAGC
31
IRQ_Scanout2
32
Vsync_ScanClock
33
GNDRF12
34
GNDRF11
35
GNDRF10
36 G
N
D
R
F
9
3
7
G
N
D
R
F
8
3
8
G
N
D
R
F
7
3
9
G
N
D
R
F
6
4
0
V
C
C
R
F
F
il
te
r
4
1
G
N
D
R
F
5
4
2
G
N
D
R
F
4
4
3
G
N
D
R
F
3
4
4
G
N
D
R
F
2
4
5
G
N
D
R
F
1
4
6
C
A
P
R
F
A
G
C
4
8
G
N
D
R
F
0
4
7
E
P
4
9
R274 100R/NC R274 100R/NC
C825
120pF 100V
C825
120pF 100V
R41
NC
R41
NC
C368
100PF/56PF
C368
100PF/56PF
C816
22pF
C816
22pF
R815
100K
R815
100K
R77
NC/10K
R77
NC/10K
L35
2
2
0
n
H
1
2
0
m
A
5
%
L35
2
2
0
n
H
1
2
0
m
A
5
%
C31
NC/0.1uF
C31
NC/0.1uF
C833
100nF C833
100nF
R19
4.7K
R19
4.7K
D103
4100-L80000-Z300
D103
4100-L80000-Z300
R23
430R
R23
430R
R62 100R R62 100R
C819
47nF
C819
47nF
R822
1K R822
1K
C837
47nF
C837
47nF
C33
0.1uF/NC
C33
0.1uF/NC
C835
220nF
C835
220nF R37
100R
R37
100R
Q806
3904 Q806
3904
L51 NC/200mA L51 NC/200mA
R63 100R R63 100R
R823 NC/0R R823 NC/0R
C834
100nF C834
100nF
R271 100R/NC R271 100R/NC
R57
NC/0 R57
NC/0
R78
NC/10K
R78
NC/10K
C823
27pF NPO C823
27pF NPO
C829
100nF
C829
100nF
L33 121/NC L33 121/NC
C361 0.1u C361 0.1u
R272 100R/NC R272 100R/NC
R816
10K
R816
10K
R79
NC/4.7K R79
NC/4.7K
R47
NC/0 R47
NC/0
1
2
3
4
5 6
7
8
1
0
1
2
GND
RF1
GND GND
RF2
GND
G
N
D
R
F
C
G
N
D
V
D
D
C
1
C
2
1
1
9
U9
PE42750DS
1
2
3
4
5 6
7
8
1
0
1
2
GND
RF1
GND GND
RF2
GND
G
N
D
R
F
C
G
N
D
V
D
D
C
1
C
2
1
1
9
U9
PE42750DS
C818
47nF
C818
47nF
R836 68R R836 68R
C839
1n 50V C839
1n 50V
TP18 TP18
1
R819 10K R819 10K
C34
0.1uF
C34
0.1uF
C817
47nF
C817
47nF
CN901
TUNER COVER
CN901
TUNER COVER
2
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
C821
22pF
C821
22pF
C831
220nF
C831
220nF
R273 100R/NC R273 100R/NC
C826
150pF 50V C826
150pF 50V
C815
22pF
C815
22pF
Q803
3906 Q803
3906
Q12
NC/3904 Q12
NC/3904 1
2
3
R20
4.7K
R20
4.7K
L34
3
3
0
n
H
1
4
0
m
A
5
%
L34
3
3
0
n
H
1
4
0
m
A
5
%
C822
27pF NPO C822
27pF NPO
C838
22pF
C838
22pF
R30
4.7K
R30
4.7K
C812
0.1uF
C812
0.1uF
C832
2.7nF
C832
2.7nF
C836
1uF C836
1uF
Q807
3904
Q807
3904
C827
1n 50V
C827
1n 50V
C30
0.1uF/NC
C30
0.1uF/NC