Read LG 55LV355B-UA / 55LV355C-UA (CHASSIS:LA0AC) Service Manual online
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
1.2K
R3740
LNA2_CTL
150
R3703
OPT
IF_P_MSTAR
10uF
6.3V
C3739
OPT
+5V_TU
0.01uF
25V
C3709
OPT
20pF
50V
C3742
OPT
0.1uF
16V
C3738
1/10W
1
R3766
100
OPT
R3701
+3.3V_TU
0.1uF
16V
C3710
TU_CVBS
0.1uF
16V
C3726
+3.3V_Normal
10uF
10V
C3741
4.7K
OPT
R3742
100pF
50V
C3707
20pF
50V
C3743
OPT
0
R3760
0.1uF
16V
C3706
0
OPT
R3707
0.1uF
16V
C3717
100K
R3733
18pF
50V
C3713
1.2K
R3768
0.1uF
16V
C3701
+3.3V_TU
0.1uF
16V
C3728
0.1uF
16V
C3704
22uF
16V
C3722
0
R3704
RF_SWITCH_CTL
IF_N_MSTAR
0.1uF 16V
C3702
+3.3V_TU
22pF
50V
OPT
C3714
TU_SCL
1.2K
R3741
100
R3732
+3.3V_TU
22pF
50V
OPT
C3712
10K
OPT
R3754
IF_AGC_MAIN
MLB-201209-0120P-N2
L3703
ISA1530AC1
Q3701
OPT
E
B
C
DEMOD_RESET
10K
R3745
OPT
0.1uF
16V
C3724
TU_SIF
ISA1530AC1
Q3705
E
B
C
220
R3752
+5V_TU
TDVJ-H101F
TU3702-*1
TI
G
L
_
H
_
T
U
P
NI
1
_
C
S
T
A
_
3
P
G
14
3.3V
13
1.2V
5
AS
12
GND
11
VIDEO
2
BST_CNTL
10
NC
4
NC[RF_AGC]
1
ANT_PWR[OPT]
17
DIF_1
9
SIF
8
NC(IF_TP)
3
+B
16
IF_AGC_CNTL
7
SDA
6
SCL
15
RESET
18
DIF_2
SHIELD
19
100uF
16V
C3705
OPT
0
R3749
0.1uF
16V
C3727
DEMOD_SCL
TDTJ-S101D
TU3702-*4
TI
G
L
_
H
_
T
U
P
NI
1
_
U
A
_
R
2
P
G
14
+B3[3.3V]
13
+B2[1.2V]
5
MOPLL_AS
12
GND
11
VIDEO
2
NC_1
10
NC_3
4
RF_AGC
1
ANT_PWR
17
DIF_1[N]
9
SIF
8
NC_2
3
+B1[5V]
16
IF_AGC
7
SDA
6
SCL
15
RESET
18
DIF_2[P]
SHIELD
19
18pF
50V
C3711
+3.3V_TU
+3.3V_TU
2.2K
R3737
OPT
33
R3735
0
R3761
0
OPT
R3705
0
R3734
OPT
10
R3767
ISA1530AC1
Q3703
E
B
C
IF_AGC_SEL
2SC3052
Q3704
E
B
C
TUNER_RESET
2SC3052
Q3702
OPT
E
B
C
100pF
50V
C3703
100pF
50V
C3737
10uF
10V
C3731
TDTR-T036F
TI
G
L
_
H
_
T
U
P
NI
2
_
C
S
T
N
TU3702-*2
14
+B3[3.3V]
13
+B2[1.2V]
5
NC_2
12
GND
11
VIDEO
2
BST_CTL
10
NC_4
4
NC_1[RF_AGC]
1
RF_S/W_CTL
17
DIF_1[N]
9
SIF
8
NC_3
3
+B1[5V]
16
IF/AGC
7
SDAT
6
SCLT
15
RESET
18
DIF_2[P]
SHIELD
19
22uF
10V
C3723
1K
OPT
R3750
0.1uF
16V
C3740
100
OPT
R3702
CONTROL_ATTEN
+5V_TU
+1.2V/+1.8V_TU
BLM18PG121SN1D
L3701
OPT
22uF
10V
C3719
0.1uF
16V
C3708
UDA55AL
TU3702-*3
O
Y
N
A
S
_
H
_
T
U
P
NI
1
_
C
S
T
A
_
3
P
G
_a
14
+3.3V
13
+1.2V
5
AS
12
GND
11
VIDEO
2
NC_2
10
NC_3
4
NC[RF_AGC]
1
NC_1
17
DIF_1
9
SIF
8
NC(IF_TP)
3
+B[+5V]
16
IF_AGC_CNTL
7
SDA
6
SCL
15
RESET
18
DIF_2
SHIELD
19
AZ1117BH-ADJTRE1
IC3703
2
OUTPUT
3
INPUT
1 ADJ/GND
0
OPT
R3762
0.1uF
16V
C3725
+1.2V/+1.8V_TU
10K
R3743
OPT
TU_SDA
+5V_TU
DEMOD_SDA
4.7K
R3753
33 R3736
+5V_TU
4.7K
OPT
R3744
220
R3751
470
R3755
22uF
10V
C3715
TDTJ-S001D
DVB_1INPUT_H_LGIT
TU3702
14
3.3V
13
1.2V
5
AS
12
GND
11
VIDEO
2
BST_CNTL
10
NC
4
NC[RF_AGC]
1
ANT_PWR[OPT]
17
DIF_1
9
SIF
8
NC[IF_TP]
3
+B
16
IF_AGC_CNTL
7
SDA
6
SCL
15
RESET
18
DIF_2
SHIELD
19
82
R3758
MLB-201209-0120P-N2
L3702
+5V_TUNER
TUNER_L
20101023
14
GP2R
200mA
c l o s e t o I F l i n e
Add,0929
FE_AGC_SPEED_CTL
60mA
P u l l - u p c a n ’ t b e a p p l i e d
because of MODEL_OPT_2
add,0929
OPTION : RF AGC
FE_BOOSTER_CTL
C l o s e t o t h e t u n e r
close to TUNER
GP2R_GLOBAL_TUNER_BLOCK
TUNER POWER
l o c a t i o n m o v e m e n t , 0 9 2 9
s h o u l d b e g u a r d e d b y g r o u n d
1 . s h o u l d b e g u a r d e d b y g r o u n d
2 . N o v i a o n b o t h o f t h e m
3 . S i g n a l W i d t h > = 1 2 m i l s
S i g n a l t o S i g n a l W i d t h = 1 2 m i l s
G r o u n d W i d t h > = 2 4 m i l s
c l o s e t o t h e t u n e r p i n , a d d , 0 9 0 2 9
BOOSTER : CHINA OPT
TUNER MULTI-OPTION
The pull-up/down of LNA2_CTL
is depended on MODLE_OPT_1.
GPIO must be added for FE_BOOSTER_CTL
T h i s w a s b e i n g a p p l i e d t o t h e o n l y c h i n a d e m o d ,
s o t h i s h a s t o b e d e l e t e d i n b o t h m a i n a n d I S D B s h e e t .
close to TUNER
S i z e c h a n g e , 0 9 2 9
S i z e c h a n g e , 0 9 2 9
G P I O m u s t b e a d d e d .
R2
R1
close to TUNER
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