LG EzSign 42LD452B, Service Manual

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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.
0 . 1 u F
16V
C5022
10uF
10V
RF_AGC_OPT
C5027
0 . 0 1 u F
25V
BOOSTER_OPT
C5011
+3.3V_TU
0 . 1 u F
16V
RF_S/W_OPT
C5002
ISA1530AC1
BOOSTER_OPT
Q5001
E
B
C
ISA1530AC1
Q5004
E
B
C
+3.3V_TU
2SC3052
BOOSTER_OPT
Q5002
E
B
C
0 . 1 u F
16V
C5028
AZ1117H-ADJTRE1(EH11A)
IC5001
2
OUTPUT
3
INPUT
1
ADJ/GND
220
R5030
NON_TU_CVBS_BYPASS
1.2K
R5020
2.2K
BOOSTER_OPT
R5017
+3.3V_TU
0 . 1 u F
16V
RF_AGC_OPT
C5026
+5V_TU
4.7K
R5025
10
R5036
0
R5003
220
R5031
NON_TU_CVBS_BYPASS
100
DEMOD_OPT
R5006
TU_CVBS
100pF
50V
C5006
10K
BOOSTER_OPT
R5021
BLM18PG121SN1D
L5003
10uF
10V
C5029
0 . 1 u F
16V
C5024
IF_AGC_SEL
0 . 1 u F
16V
C5003
0 . 1 u F
16V
C5021
18pF
50V
C5012
1K
OPT
R5027
+5V_TU
TUNER_RESET
1K
OPT
R5026
+5V_TU
0 . 1 u F
16V
C5016
OPT
IF_P_EXT
0
R5024
18pF
50V
C5013
+5V_TU
TU_SIF
2SC3052
RF_AGC_OPT
Q5003
E
B
C
100
R5009
33
R5016
10K
RF_AGC_OPT
R5028
1.2K
R5038
0 . 1 u F
16V
C5007
0
RF_AGC_OPT
R5001
1
R5033
0
RF_S/W_OPT
R5002
+3.3V_TU
100pF
50V
C5001
+5V_Normal
0 . 1 u F
16V
C5023
+1.2V/+1.8V_TU
ISA1530AC1
Q5005
NON_TU_CVBS_BYPASS
E
B
C
1.2K
R5018
TU_SCL
22uF
16V
OPT
C5018
33
R5015
0
NON_DEMOD_OPT
R5035
TDVJ-H001F
TU5001
NTSC_1INPUT_H_LGIT
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
S I F
8
NC(IF_TP)
3
+B
16
IF_AGC_CNTL
7
SDA
6
SCL
15
RESET
18
DIF_2
SHIELD
19
IF_P_MSTAR
1K
R5022
+3.3V_Normal
22uF
16V
C5019
IF_N_MSTAR
0
BOOSTER_OPT
R5014
LNA2_CTL
470
R5029
RF_SWITCH_CTL
+3.3V_TU
0 . 1 u F
16V
C5031
22uF
16V
C5020
0
TU_CVBS_BYPASS
R5039
IF_N_EXT
82
R5032
TU_SDA
IF_AGC
10K
BOOSTER_OPT
R5019
0 . 1 u F 16V
C5025
100K
R5011
0 . 1 u F
16V
C5010
+1.2V/+1.8V_TU
+5V_TU
CONTROL_ATTEN
22uF
16V
OPT
C5017
100
DEMOD_OPT
R5007
MLB-201209-0120P-N2
BOOSTER_OPT
L5001
BLM18PG121SN1D
L5002
0
NON_DEMOD_OPT
R5034
UDA45AL
TU5001-*1
NTSC_1INPUT_H_SANYO
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
S I F
8
NC(IF_TP)
3
+B
16
IF_AGC_CNTL
7
SDA
6
SCL
15
RESET
18
DIF_2
SHIELD
19
MDS61887705
M1
SMD GASKET
OPTION : RF S/W
G P I O m u s t b e a d d e d .
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 .
s h o u l d b e g u a r d e d b y g r o u n d
2 . A D D o f T U N E R P / N ( w . s . J e o n g _ 1 1 1 6 )
200mA
OPTION : BOOSTER
2 ) R 5 0 3 0 , R 5 0 3 1 : 2 0 0 / 1 6 0 8 T y p e = = > 2 2 0 / 2 0 1 2 T y p e ( w . s . J e o n g _ 1 1 1 6 )
C l o s e t o t h e t u n e r
V e r 1 . 0 - - > 1 . 1 : C h a n g e o f c h i p t y p e , 0 9 1 0 1 9 , w . s . j e o n g
1 ) R 5 0 2 9 , R 5 0 3 0 , R 5 0 3 1 : 1 0 0 5 T y p e = = > 1 6 0 8 T y p e ( w . s . J e o n g _ 1 0 1 9 )
60mA
1 . D e - r e t i n g
T h e p u l l - u p / d o w n o f L N A 2 _ C T L
is depended on MODLE_OPT_1.
GPIO must be added for FE_BOOSTER_CTL
LGIT CAN H/N TUNER for US
* C h a n g e H i s t o r y .
OPTION : RF AGC
P u l l - u p c a n ’ t b e a p p l i e d
because of MODEL_OPT_2
GP2_Saturn7M
12 TUNER
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