Read LG 42LM3400 (CHASSIS:LT21C) Service Manual online
THERMAL
THERMAL
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.
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.
FE_TS_DATA[1]
FE_TS_DATA[2]
FE_TS_DATA[5]
FE_TS_DATA[3]
FE_TS_DATA[4]
FE_TS_DATA[0]
FE_TS_DATA[7]
FE_TS_DATA[6]
IF_AGC_SEL
C3737
100pF
50V
100pF
50V
C3743
20pF
50V
TU_I2C_FILTER
20pF
50V
TU_I2C_FILTER
C3739
10uF
6.3V
10uF
6.3V
OPT
DEMOD_SCL
C3730
10uF
10V
10uF
10V
FULL_NIM
R3705
0
RF_SW_OPT
C3711
18pF
50V
18pF
50V
TU_I2C_NON_FILTER
R3758
82
82
R3732
100
100
R3748
11K
11K
FULL_NIM_BCD
R3733
100K
TU_CVBS
C3708
0.1uF
16V
16V
R3771
10K
FULL_NIM_OPT
C3715
22uF
10V
22uF
10V
R3756
0
TU_NON_BUFFER
C3702
0.1uF
16V
NON_ASIA
C3729
0.1uF
16V
FULL_NIM
R3749
0
TU_BUFFER
IF_AGC_MAIN
L3704
FULL_NIM
+3.3V_TU
IF_N_MSTAR
C3727
0.1uF
16V
DEMOD_RESET
C3705
100uF
16V
16V
OPT
R3740-*1
1K
TU_IIC_NON_ATSC_1K
+3.3V_TU
IC3701
AP2132MP-2.5TRG1
FULL_NIM_BCD
3
VIN
2
EN
4
VCTRL
1
PG
5
NC
6
VOUT
7
ADJ
8
GND
9
[EP]
LNA2_CTL
RF_SWITCH_CTL
R3760
0
HALF_NIM
+3.3V_TU
R3769
10K
FULL_NIM
TU3700-*1
TDSS-H101F
SI2176_ATSC_1INPUT_H
5
+B1[3.3V]
11
DIF[N]
2
RESET
10
DIF[P]
4
SDA
1
NC
9
IF_AGC
8
CVBS
3
SCL
7
+B2[1.8V]
6
SIF
12
SHIELD
+1.8V_TU
C3741
10uF
10V
10uF
10V
+3.3V_TU
R3741-*1
1K
TU_IIC_NON_ATSC_1K
C3716
0.1uF
16V
HALF_NIM
C3717
0.1uF
16V
+1.23V_TU
+5V_Normal
DEMOD_SDA
C3710
0.1uF
16V
TUNER_RESET
FE_TS_DATA[0-7]
R3753
4.7K
TU_BUFFER
TU_SDA
C3740
0.1uF
16V
C3707
100pF
50V
100pF
50V
TU_SIF
R3775
0
0
TU_NON_BUFFER
+3.3V_Normal
+3.3V_TU
R3761
0
HALF_NIM
+3.3V_TU
+3.3V_TU
C3713
18pF
50V
TU_I2C_NON_FILTER
18pF
50V
TU_I2C_NON_FILTER
R3750
1K
OPT
+1.8V_TU
FE_TS_SYNC
IF_P_MSTAR
C3725
0.1uF
16V
16V
TU_SCL
C3738
0.1uF
16V
0.1uF
16V
C3701
0.1uF
16V
0.1uF
16V
C3718
0.1uF
16V
FULL_NIM
+1.23V_TU
FE_TS_CLK
C3723
22uF
10V
22uF
10V
FE_TS_VAL_ERR
C3742
20pF
50V
20pF
50V
TU_I2C_FILTER
TU3703
TDSN_B001F
TDSN_B001F
SI2176_BR_2INPUT_H
1
RF_S/W_CTL
2
RESET
3
SCL
4
SDA
5
+B1[3.3V]
6
SIF
7
+B2[1.8V]
8
CVBS
9
NC_1
10
NC_2
11
NC_3
12
+B3[3.3V]
13
+B4[1.23V]
14
NC_4
15
GND
16
ERROR
17
SYNC
18
VALID
19
MCLK
20
D0
21
D1
22
D2
23
D3
24
D4
25
D5
26
D6
27
D7
28
SHIELD
TU3704
TDSH-T101F
SI2176_TW_2INPUT_H
5
+B1[3.3V]
11
DIF[N]
2
RESET
10
DIF[P]
4
SDA
1
RF_S/W_CTL
9
IF_AGC
8
CVBS
3
SCL
7
+B2[1.8V]
6
SIF
12
SHIELD
R3751
220
TU_BUFFER
R3752
220
TU_BUFFER
R3766
1
1
R3774
470
TU_BUFFER
R3747
20K
1005
FULL_NIM_BCD
R3776
10K
10K
FULL_NIM_BCD
R3785
0
ASIA
R3782
2K
2K
OPT
R3786
0
ASIA
R3783
0
NON_ASIA
C3702-*1
0
ASIA
R3784
0
NON_ASIA
IC3701-*1
TJ4220GDP-ADJ
FULL_NIM_TJ
3
VIN3
2
EN2
4
NC4
1
NC_1
5
NC_2
6
VOUT
7
ADJ/SENSE
8
GND
9
[EP]GND
R3748-*1
5.1K
5.1K
FULL_NIM
R3776-*1
0
0
FULL_NIM_TJ
R3747-*1
9.1K
9.1K
FULL_NIM_TJ
IC3703
AP1117E18G-13
2
OUT
3
IN
1
ADJ/GND
L3703
CIS21J121
L3706
120
FULL_NIM
Q3703
MMBT3906(NXP)
TU_BUFFER
E
B
C
Q3705
MMBT3906(NXP)
TU_BUFFER
E
B
C
R3713
0
0
FULL_NIM_BCD
R3710
200
1%
OPT
R3704
100
HALF_NIM
R3740
1.8K
TU_IIC_ATSC_1.8K
R3741
1.8K
TU_IIC_ATSC_1.8K
R3741-*2
1.2K
TU_IIC_ATSC_1.2K
TU_IIC_ATSC_1.2K
R3740-*2
1.2K
TU_IIC_ATSC_1.2K
TU3700
TDSS-G201D
SI2156_DVB_1INPUT_H
5
+B1[3.3V]
11
DIF[N]
2
RESET
10
DIF[P]
4
SDA
1
NC_1
9
IF_AGC
8
NC_3
3
SCL
7
+B2[1.8V]
6
NC_2
12
SHIELD
R3741-*3
2.2K
TU_IIC_BR_2.2K
R3740-*3
2.2K
TU_IIC_BR_2.2K
R3735
TU_I2C_NON_FILTER
33
R3736
TU_I2C_NON_FILTER
33
C3711-*1
20pF
50V
20pF
50V
TU_I2C_FILTER
C3713-*1
20pF
50V
20pF
50V
TU_I2C_FILTER
R3735-*1
TU_I2C_FILTER
R3736-*1
TU_I2C_FILTER
R3711
0
R3781
3.3
ASIA
R3780
3.3
ASIA
C3750
5pF
50V
ASIA
5pF
50V
ASIA
C3751
5pF
50V
5pF
50V
ASIA
TUNER_NON_EU
GP4L_S7LR2
2011.10.11
14
R1
should be guarded by ground
FE_BOOSTER_CTL
380mA
R2
close to the tuner pin, add,09029
Close to the CI Slot
FE_AGC_SPEED_CTL
Pull-up can’t be applied
because of MODEL_OPT_2
because of MODEL_OPT_2
60mA
close to TUNER
Close to the tuner
BCD Vo=0.6*(1+R1/R2)
Add,0929
TUNER MULTI-OPTION
1. should be guarded by ground
2. No via on both of them
3. Signal Width >= 12mils
Signal to Signal Width = 12mils
Ground Width >= 24mils
2. No via on both of them
3. Signal Width >= 12mils
Signal to Signal Width = 12mils
Ground Width >= 24mils
Size change,0929
close to TUNER
GLOBAL tuner block except EU and China
TJ Vo=0.8*(1+R1/R2)
Vo=VREF*(1+R2/R1)
VREF = 1.25V
R1
R2
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