LG 42LN54XX / 42LN540S / 42LN540V / 42LN541V / 42LN542V (CHASSIS:LD31B / LD36B) Service Manual ▷ View 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.
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.
LAN
2012/06/21
21
NC4_S7LRM
EPHY_RN
EPHY_TN
EPHY_TP
JK2100
XRJV-01V-0-D12-080
ETHERNET_XMULTIPLE
1
2
3
4
5
6
7
8
9
9
+2.5V_Normal
EPHY_RP
C2104
0.01uF
50V
0.01uF
50V
ETHERNET
L2101
BLM18PG121SN1D
ETHERNET
R2101
49.9
ETHERNET
R2102
49.9
ETHERNET
C2101
0.1uF
ETHERNET
R2104
49.9
ETHERNET
C2102
0.1uF
ETHERNET
R2103
49.9
ETHERNET
JK2100-*1
RJ45VT-01SN002
ETHERNET_XML_EMI
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
ETHERNET
* H/W option : ETHERNET
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.
2012/06/19
TUNER_EU
26
NC4_S7LRM
FE_TS_DATA[5]
FE_TS_DATA[6]
FE_TS_DATA[7]
FE_TS_DATA[0]
FE_TS_DATA[2]
FE_TS_DATA[3]
FE_TS_DATA[4]
FE_TS_DATA[1]
R2605
22
DVB_S
C2616
0.1uF
16V
0.1uF
16V
CHINA
R2600
51
DVB_S
TU_CVBS
C2604
0.1uF
16V
0.1uF
16V
R2613
10
F_NIM/CHINA
R2624
220
T2_C_S2/CHINA
TU_SIF
R2632
1
Q2601
MMBT3906(NXP)
T2_C_S2/CHINA
E
B
C
R2615
1K
R2616
4.7K
4.7K
T2_C_S2/CHINA
R2633
12K
1%
F_NIM/CHINA
+1.23V_TU
R2604
22
DVB_S
R2610-*1
MLG1005SR27JT
TU_I2C_FILTER
+3.3V_TU
FE_TS_DATA[0-7]
L2603
BLM18PG121SN1D
CHINA
R2612
0
OPT
AR2603
47
CHINA
TU_GND_A
C2634
0.1uF
16V
0.1uF
16V
DVB_S
C2618
10uF
6.3V
10uF
6.3V
CHINA
L2601
BLM18PG121SN1D
CHINA
C2621
100pF
50V
100pF
50V
+3.3V_TU
+3.3V_S2_DE
C2633
0.1uF
16V
0.1uF
16V
CHINA
R2606
0
CHINA
C2620
0.1uF
16V
0.1uF
16V
CHINA
TU_GND_B
FE_TS_VAL_ERR
R2610
TU_I2C_NON_FILTER
33
TUNER_RESET
R2608
0
H_NIM/NON_T2
C2644
0.1uF
16V
16V
FE_TS_CLK
C2607
20pF
50V
20pF
50V
C2614
100pF
50V
100pF
50V
CHINA
+1.8V_TU
C2630
0.1uF
16V
0.1uF
16V
LNA2_CTL
R2629
3.3K
F_NIM/CHINA
+3.3V_S2_DE
R2635
680
OPT
OPT
Q2600
MMBT3906(NXP)
T2_C_S2/CHINA
E
B
C
LNB_TX
C2625
0.1uF
16V
0.1uF
16V
DVB_S
R2609
TU_I2C_NON_FILTER
33
L2600
BLM18PG121SN1D
DVB_S
FE_TS_ERR
C2623
0.1uF
16V
16V
R2603
0
RF_SW_OPT
L2606
CIS21J121
+3.3V_TU
C2651
20pF
50V
20pF
50V
R2618
470
T2_C_S2/CHINA
C2626
0.1uF
16V
16V
DEMOD_SDA
FE_TS_VAL
+3.3V_Normal
AR2602
47
CHINA
R2609-*1
MLG1005SR27JT
TU_I2C_FILTER
+3.3V_TU_CHINA
+3.3V_TU_CHINA
TU_SDA
FE_TS_ERR
AR2601
47
CHINA
C2641
0.1uF
0.1uF
16V
C2617
0.1uF
16V
0.1uF
16V
CHINA
C2622
0.1uF
16V
C2635
0.1uF
16V
+1.23V_TU
TU_GND_B
LNB_OUT
RF_SWITCH_CTL
+3.3V_TU
C2611
0.1uF
16V
0.1uF
16V
DVB_S
R2628
0
IF_AGC_MAIN
IC2603
AP1117E18G-13
OUT
INADJ/GND
R2607
0
OPT
R2637
680
OPT
OPT
IF_P_MSTAR
TU_SCL
C2645
0.1uF
16V
F_NIM/CHINA
DEMOD_SCL
C2602
100pF
50V
100pF
50V
R2634
22K
1%
22K
1%
F_NIM/CHINA
C2600
0.1uF
16V
16V
R2614
100K
R2625
220
T2_C_S2/CHINA
FE_TS_VAL
C2603
0.1uF
16V
0.1uF
16V
RF_SW_OPT
TU_GND_B
R2648
200
1%
OPT
C2646
22uF
10V
22uF
10V
IF_N_MSTAR
FE_TS_SYNC
C2608
100pF
50V
100pF
50V
DVB_S
C2624
100pF
50V
100pF
50V
DVB_S
R2647
0
+1.8V_TU
R2636
2K
OPT
2K
OPT
R2611
100
100
+3.3V_TU
C2612
20pF
50V
20pF
50V
TU_GND_B
IC2602
TJ4220GDP-ADJ
F_NIM/CHINA
3
VIN3
2
EN2
4
NC4
1
NC_1
5
NC_2
6
VOUT
7
ADJ/SENSE
8
GND
9
[EP]GND
+3.3V_TU
+3.3V_TU
C2619
0.1uF
16V
0.1uF
16V
F_NIM/CHINA
L2602
BLM18PG121SN1D
DVB_S
+3.3V_TU
C2643
22uF
10V
22uF
10V
C2648
0.1uF
0.1uF
16V
R2619
82
82
T2_C_S2/CHINA
C2652
20pF
50V
20pF
50V
R2620
1K
S2_RESET
+1.23V_TU
IF_AGC_SEL
LNA_CTRL_1
BR_RESET_DEMOD
LNA_CTRL_2
R2644 0
CHINA
TU2603
TDSS-G501D
TUNER_T/C_H/NIM
5
3.3V
11
DLIF[N]
2
RESET
10
DLIF_[P]
4
SDA
1
NC
9
IF_AGC
8
ALIF_[P]
3
SCL
7
1.8V
6
ALIF_[N]
12
SHIELD
A1
A1
B1
B1
TU2602
TDSQ-G601D
TDSQ-G601D
TUNER_T2/C/S2_F/NIM
1
NC_1
2
RESET
3
SCL
4
SDA
5
+B1[3.3V]
6
SIF
7
+B2[1.8V]
8
CVBS
9
NC_2
10
NC_3
11
NC_4
12
NC_5
13
NC_6
14
NC_7
15
GND_1
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
GND_2
29
GND_3
30
+B3[1.23V]
31
S2/T2_RESET
38
SHIELD
32
+B4[3.3V]
33
S2_F22_OUTPUT
34
S2/T2_SCL
35
S2/T2_SDA
36
LNB
37
GND_4
A1
A1
B1
B1
TU2601
TDSQ-G501D
TUNER_T/C/S2_F/NIM
1
NC_1
2
RESET
3
SCL
4
SDA
5
+B1[3.3V]
6
NC_2
7
+B2[1.8V]
8
NC_3
9
T/C_IF_AGC
10
T/C_DIF[P]
11
T/C_DIF[N]
12
NC_4
13
NC_5
14
NC_6
15
GND_1
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
GND_2
29
GND_3
30
+B3[1.23V]
31
S2_RESET
38
SHIELD
32
+B4[3.3V]
33
S2_F22_OUTPUT
34
S2_SCL
35
S2_SDA
36
LNB
37
GND_4
A1
A1
B1
B1
C2631-*1
10uF
10V
10uF
10V
CAP_10uF_X7R_CHINA
C2632-*1
10uF
10V
10uF
10V
CAP_10uF_X7R_DVB_S
C2647-*1
10uF
10V
10uF
10V
CAP_10uF_X7R_FNIM/CHINA
C2642-*1
10uF
10V
CAP_10uF_X7R
C2615
10uF
6.3V
6.3V
DVB_S
C2631
10uF
10V
10uF
10V
CAP_10uF_X5R_CHINA
C2632
10uF
10V
10uF
10V
CAP_10uF_X5R_DVB_S
C2647
10uF
10V
10uF
10V
CAP_10uF_X5R_FNIM/CHINA
C2642
10uF
10V
CAP_10uF_X5R
R2617
0
NON_CHINA
R2630
0
NON_CHINA
TU_GND_B
R2631
0
NON_CHINA
R2622
0
NON_CHINA
R2638
0
NON_CHINA
R2623
0
NON_CHINA
R2639
0
NON_CHINA
R2626
0
NON_CHINA
R2627
0
NON_CHINA
R2643
0
NON_CHINA
TU_GND_A
R2642
0
NON_CHINA
R2646
0
NON_CHINA
R2645
0
NON_CHINA
R2640
0
NON_CHINA
R2641
0
NON_CHINA
R2621
0
NON_CHINA
TU2604
TDSM-C601D
TUNER_CHINA_F/NIM
8
CVBS
9
NC_1
10
NC_2
11
NC_3
12
+B3[3.3V]
13
+B4[1.23V]
14
DEMOD_RESET
15
GND
16
NC_4
17
SYNC
18
VALID
19
MCLK
20
D0
21
D1
22
D2
23
D3
24
D4
25
D5
26
D6
27
D7
RF_S/W_CTL
50
RESET
51
SHIELD
59
SIF
55
+B1[3.3V]
54
SDA
53
SCL
52
+B2[1.8V]
56
A1
A1
A2
A2
B1
B1
B2
B2
R2602
10
NON_T2_C_S2/CHINA
R2601
10
NON_T2_C_S2/CHINA
AR2601-*1
0
1/16W
0
1/16W
DVB_S
AR2602-*1
0
1/16W
0
1/16W
DVB_S
AR2603-*1
0
1/16W
0
1/16W
DVB_S
NETCAST4.0 EU&CHUNA_TUNER_BLOCK
Close to TUNER
Vo=VREF*(1+R2/R1)
close to TUNER
R1
R1
Close to the tuner
ERROR & VALID PIN
VREF=1.25V
R2
Vo=0.8*(1+R2/R1)
should be guarded by ground
R2
GPIO must be added.
This was being applied to the only china demod,
so this has to be deleted in both main and ISDB sheet.
so this has to be deleted in both main and ISDB sheet.
GND seperation for CHINA tuner
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.
2012/06/19
LNB
27
NC4_S7LRM
R2701
0
C2709
0.1uF
50V
0.1uF
50V
LNB
C2710
0.1uF
LNB
A_GND
+12V_LNB
+12V_LNB
D2704
40V
LNB_SMAB34
D2705-*1
40V
LNB_SX34
A_GND
C2708
10uF
25V
10uF
25V
LNB
A_GND
C2707
0.1uF
LNB
R2706
0
0
R2702
2.2K
1W
2.2K
1W
LNB
C2712
0.1uF
50V
0.1uF
50V
LNB
C2703
0.01uF
50V
LNB
R2705
33
LNB
D2705
40V
LNB_SMAB34
D2704-*1
40V
LNB_SX34
C2705
10uF
25V
10uF
25V
LNB
A_GND
A_GND
C2704
10uF
25V
10uF
25V
LNB
D2701
LNB
D2703
30V
LNB
A_GND
R2704
33
LNB
D2702
30V
MBR230LSFT1G
LNB
LNB_TX
C2706
10uF
25V
10uF
25V
LNB
+12V
C2713
0.22uF
25V
LNB
L2701
BLM18PG121SN1D
LNB
LNB_OUT
C2711
0.22uF
LNB
L2702
15uH
SP-7850_15
LNB
DEMOD_SCL
DEMOD_SDA
C2701
18pF
18pF
LNB
C2714
18pF
18pF
LNB
C2702
33pF
33pF
LNB
R2703
36K
36K
1/16W
1%
1%
LNB
IC2701
A8303SESTR-T
LNB
1
VCP
3
NC_1
7
SCL
9
ADD
10
TONECTRL
11
TCAP
12
ISET
13
VREG
14
GND
15
VIN
16
LX
17
GNDLX
18
NC_2
19
NC_3
20
BOOST
5
TDO
8
SDA
6
IRQ
4
TDI
2
LNB
21
[EP]GND
close to TUNER
DVB-S2 LNB Part Allegro
Close to Tuner
Surge protectioin
3A
Input trace widths should be sized to conduct at least 3A
(Option:LNB)
Ouput trace widths should be sized to conduct at least 2A
close to Boost pin(#1)
Max 1.3A
close to VIN pin(#15)
2A
Max 1.3A
Caution!! need isolated GND
3.5A
TH
ER
MA
L
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.
2012/08/29
AMP_STA380BWEF
34
NC4_S7LRM
SPK_L+
+3.5V_ST
AMP_MUTE
AMP_SCL
C3420
0.22uF
50V
0.22uF
50V
R3403
10K
SPK_R-
C3415
1uF
50V
+3.3V_Normal
R3410
43
R3408
43
L3401
CIS21J121
R3404
100
R3402
10K
10K
C3412
1uF
50V
C3424
1000pF
50V
1000pF
50V
R3401
10K
SPK_L+
P3401
WAFER-ANGLE
1
2
3
4
C3425
1000pF
50V
1000pF
50V
C3408
0.1uF
16V
0.1uF
16V
C3427
1000pF
50V
1000pF
50V
C3419
0.22uF
50V
0.22uF
50V
SPK_L-
SPK_L-
+3.3V_Normal
AUD_MASTER_CLK
C3423
0.22uF
50V
0.22uF
50V
C3426
1000pF
50V
1000pF
50V
C3411
0.1uF
50V
C3416
0.1uF
50V
C3413
330pF
50V
330pF
50V
C3422
0.22uF
50V
0.22uF
50V
SPK_R+
Q3401
MMBT3904(NXP)
MMBT3904(NXP)
E
B
C
AUD_LRCH
C3414
330pF
50V
330pF
50V
R3409
43
AUD_SCK
AMP_RESET
SPK_R+
R3411
43
C3407
0.1uF
16V
0.1uF
16V
POWER_DET
+24V
C3421
0.22uF
50V
0.22uF
50V
C3401
1000pF
50V
1000pF
50V
C3409
0.1uF
16V
AMP_SDA
C3418
0.22uF
50V
0.22uF
50V
R3405
0
OPT
SPK_R-
C3404
2.2uF
2.2uF
10V
C3403
0.1uF
0.1uF
16V
AUD_LRCK
R3406
0
R3407
0
IC3401
STA380BWF
1
VCC_REG
2
VSS_REG
3
OUT2B
4
GND2
5
VCC2
6
OUT2A
7
OUT1B
8
VCC1
9
GND1
10
OUT1A
11
VDD_REG
12
GND_REG
1
3
N
C
_
1
1
4
N
C
_
2
1
5
N
C
_
3
1
6
N
C
_
4
1
7
N
C
_
5
1
8
N
C
_
6
1
9
N
C
_
7
2
0
N
C
_
8
2
1
N
C
_
9
2
2
N
C
_
1
0
2
3
N
C
_
1
1
2
4
N
C
_
1
2
25
NC_13
26
NC_14
27
NC_15
28
VDDDIG1
29
GNDDIG1
30
FFX3A
31
FFX3B
32
EAPD/FFX4A
33
TWARNEXT/FFX4B
34
VREGFILT
35
AGNDPLL
36
MCLK
3
7
B
I
C
K
I
3
8
L
R
C
K
I
39
SDI
40
RESET
41
PWDN
42
INTLINE
43
SDA
44
SCL
45
SA
46
TESTMODE
47
GNDDIG2
48
VDDDIG2
49
[EP]
L3404
10uH
L3402
10uH
L3405
10uH
L3403
10uH
C3417
10uF
35V
3216
AUDIO AMP(STA380BWEF)
SPEAKER_R
SPEAKER_L
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