LG 42LH40 Schematic
LCD TV
SCHEMATICS and EXPLODED VIEW
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LA92G
MODEL : 42LH40
42LH40-UA
North/Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Only for training and service purposes
300
200
801
120
121
122
500
330
510
805
804
803
802
806
550
910
900
530
540
400
521
A2
A10
LV1
- 27 -
LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special saf ety pa rts sho uld be rep lac ed with the same compon ent s as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
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.
30V
D1209
ZENER
ADUC30S03010L
COMP1_Y
001 :D27
100p F
50V
C1240
12KR1263
AV_L_IN
75
R1288
12K
R1255
VGA_EEPROM_WP
001:A R22
5.6 V
D1243
ADMC5M03200L
ZENER
COMP2_PB
001 :D31
COMP1_L_IN
001 :R32
10K
R1259
30V
D1208
ZENER
ADUC30S03010L
470K
R1244
1K
R1271
10K
R1292
30V
D1217
ADUC30S03010L
ZENER
12K
R1293
100p F
50V
C1225
10K
R1205
0. 1uF
16V
C1228
5.6 V
D1212
ADMC5M03200L
ZENER
75
R1241
470K
R1298
470K
R1289
+5V_GENERAL
100p F
50V
C1224
SIDEAV_DET
001:A R23
18pF
50V
C1223
1000 pF
50V
C1238
DSUB_DET
COMP2_PR
001 :D31
+3.3 V
PC_L_IN
001 :R32
+5V_ST
AV_R_IN
0
R1232
12K
R1294
COMP2_DET
001:A R23
1000 pF
50V
C1220
5.6 V
OPT
D1234
ADMC5M03200L
10K
R1252
ENKMC2838-T112
D1223
A1
C
A2
COMP2_R_IN
001 :R33
OPT
C1216
470K
R1290
+3.3 V
30V
D1215
ADUC30S03010L
ZENER
1K
R1283
470K
R1208
1K
R1240
0
R1307
ISP_RXD
001:A B27
100
R1269
10K
R1300
18pF
50V
C1222
10K
R1277
100p F
50V
C1251
30V
D1226
ADUC30S03010L
ZENER
100p F
50V
OPT
C1206
75
R1238
470K
R1247
30V
D1216
ADUC30S03010L
ZENER
10K
R1237
75
R1287
12K
R1210
COMP1_PB
001 :D27
75
1%
R1215
22
R1257
BG2012B080TF
L1218
PC_R_IN
001 :R31
DSUB_B
001 :D28
AV_CVBS_DET
001:A R23
COMP1_PR
001 :D28
+3.3 V
10K
R1204
5.6 V
D1230
ADMC5M03200L
ZENER
12K
R1207
12K
R1256
470K
R1245
1000 pF
50V
C1221
ISP_TXD
001: AB27 ;001: AR31
10K
R1211
30V
D1210
ADUC30S03010L
ZENER
30V
D1219
ADUC30S03010L
ZENER
100p F
50V
C1241
1K
R1212
30V
D1227
ADUC30S03010L
ZENER
SIDEAV_R_IN
001 :R33
KCN-DS-1-0089
JK1201
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
BG2012B080TF
L1217
75
R1242
5.6 V
D1211
ADMC5M03200L
ZENER
DSUB_HSYNC
001 :D29
470K
R1246
47pF
50V
C1252
10K
R1251
10K
R1262
5.6 V
ZENER
D1225
ADMC5M03200L
5.6 V
D1221
ADMC5M03200L
ZENER
10K
R1248
30V
D1245
ADUC30S03010L
ZENER
1000 pF
50V
C1237
5.6 V
D1220
ADMC5M03200L
ZENER
75
R1243
SIDEAV_CVBS_IN
001 :D26
OPT
C1218
100p F
C1219
5.6 V
D1231
ADMC5M03200L
ZENER
PEJ 024 -01
JK120 5
6B
T_TERMINAL2
8
SHIELD_PLATE
7B
B_TERMINAL2
5
T_SPRING
4
R_SPRING
7A
B_TERMINAL1
6A
T_TERMINAL1
3
E_SPRING
DSUB_G
001 :D29
470K
R1297
75
R1286
5.6 V
D1213
ADMC5M03200L
ZENER
100p F
OPT
C1227
DSUB_R
001 :D29
0
R1305
COMP1_R_IN
001 :R32
DSUB_VSYNC
001 :D29
AV_CVBS_IN
001 :D26
10K
R1258
COMP2_Y
001 :D31
22
R1265
OPT
C1217
SIDEAV_L_IN
001 :R33
470K
R1206
10K
R1301
0 R1233
12KR1264
1K
R1254
PPJ 218 -01
JK120 2
5C
[RD]CONTACT
2C
[RD]U_CAN
4C
[RD]O_SPRING
2B
[WH]U_CAN
3B
[WH]C_LUG
2A
[YL]U_CAN
5A
[YL]CONTACT
4A
[YL]O_SPRING
COMP2_L_IN
001 :R33
5.6 V
D1242
ADMC5M03200L
ZENER
+3.3V
10K
R1270
0
OPT
R1268
12K
R1304
10K
R1291
30V
D1218
ADUC30S03010L
ZENER
4.7 K
R1249
BG2012B080TF
L1208
BG2012B080TF
L1207
12K
R1303
4.7 K
R1253
5.6 V
D1229
ADMC5M03200L
ZENER
30V
D1228
ADUC30S03010L
ZENER
100p F
50V
C1250
BG2012B080TF
L1206
30V
D1207
ADUC30S03010L
ZENER
5.6 V
D1214
ADMC5M03200L
ZENER
COMP1_DET
001:A R23
5.6 V
OPT
D1235
ADMC5M03200L
AT24C02BN-10SU-1.8
IC1200
3
A2
2
A1
4
GND
1
A0
5
SDA
6
SCL
7
WP
8
VCC
5.6 V
OPT
D1224
ADMC5M03200L
5.6 V
OPT
D1222
ADMC5M03200L
5.6 V
ZENER
D1244
ADMC5M03200L
PPJ 227 -01
JK120 6
9N [GN]E-LUG
5K [GN]O-SPRIN G-L
6K [GN]CONTACT-L
4E [GN]O-SP RING-S
3E [GN]CONTACT-S
9M [BL]E-LUG
7J [BL]C-L UG-L
8D [BL]C- LUG-S
9L [YL]E-LUG
4L [YL]O- SPRING-S
3L [YL]CONTACT-S
7H [RD]C-LUG-L
8C [RD]C-LUG -S
9G [WH]E-LUG
8M [WH]C-LUG-S_1
7G [WH]C-LUG-L
8B [WH]C-LUG-S_2
9F [RD]E-LUG
4N [RD]O- SPRING-S_ 1
3N [RD]CONTACT-S_1
5F [RD]O-SP RING-L
6F [RD]CONTACT-L
4A [RD]O- SPRING-S_ 2
3A [RD]CONTACT-S_2
BLM18PG121SN1D
L1209
220
R1299
DBG_TX
47pF
50V
C1243
0. 1uFC1232
100
R1281
MAX3232CDR
IC1201
3
C1-
2
V+
4
C2+
1
C1+
6
V-
5
C2-
7
DOUT2
8
RIN2
9
ROUT2
10
DIN2
11
DIN1
12
ROUT1
13
RIN1
14
DOUT1
15
GND
16
VCC
30V
OPT
D1237
ADUC30S03010L
4.7 K
R1279
2SC305 2
Q1200
E
B
C
0. 1uFC1231
100
OPT
R1285
0. 33u FC1229
0. 1uF
C1230
+5V_ST
220p F
50V
C1235
30V
OPT
D1236
ADUC30S03010L
2SC305 2
OPT
Q1201
E
B
C
100K
R1272
0
R1275
100K
R1273
47pF
50V
C1242
0. 1uF
16V
C1234
220p F
50V
C1239
3.3 K
R1274
DBG_RX
100
R1282
220
R1302
KCN-DS-1-0088
JK1203
1
2
3
4
5
6
7
8
9
10
3.3 K
OPT
R1218
0
R1276
IR
0
R1216
+5V_ST
100
OPT
R1284
10K
OPT
R1217
+3.3V _ST
4.7 K
R1278
0. 1uFC1233
+3.3 V
NL17SZ00DFT2G
IC1 203
3
GND
2
B
4
Y
1
A
5
VCC
100p F
50V
C1254
1/10W
22
1%
R1383
Fi b er O pt i c
JST 122 3-00 1
JK601
1
GND
2
VCC
3
VINPUT
4
FIX_POLE
4.7 K
R1381
0. 1uF
50V
C1255
1K
R638
OPT
+5V_GENERAL+3.3 V
SPDIF_OUT
001:W2 9
0
R1382
OPT
0
R1385
OPT
0
R1384
OPT
D610
0. 1uF
50V
C660
75
R1235
75
R1236
75
R1234
1
IN/OUT
MStar(M+S)
14
09 . 0 3. 1 3
DO JAE GEUN
COMPONENT2
SIDE_AV
COMPONENT1
AV
R,G,B PC&DDC
PC AUDIO
COMPONENT1/2,AV1
RS-232C
S er ia l P or t
mal e
RxD
TxD
Ne e t to pu l l up 3. 3V
SPDIF OPTIC JACK
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. 1uF
C530
0
R536
HPD2
005:AM11
5V_HDMI_1
CEC_REMOTE
005 :H2 6;0 05: H17 ;00 5:L2 7;0 05: R8; 005 :AM 11
47K
R534
CK+_HDMI1
005 :Z1 2
HDMI_CLK-
+3.3V_HDMI
GND
D2+_HDMI1
005 :Z1 0
0. 1uF
C515
0
OPT
R560
47K
R535
D0-_HDMI3
DDC_SDA_2
GND
CK+_HDMI1
0R524
D1-_HDMI4
005:AG 20
0 R584
AVRL161A1R1NT
VR502
OPT
JP5 01
0 R583
D2-_HDMI3
005:AG 6
DDC_SCL_3
0R550
0. 1uF
16V
C501
OPT
GND
1K
R522
OPT
D0-_HDMI4
005:AG 20
+3.3 V
CK-_HDMI3
005: AE6
CEC_REMOTE
HDMI_RX1-
CK+_HDMI2
CK-_HDMI1
005 :Z1 2
0 R594
+3.3V _ST
0
R558
0. 1uF
16V
C508
0R548
CK+_HDMI4
JP5 00
D0-_HDMI1
DDC_SCL_1
0
R545
GND
D0+_HDMI1
0. 1uF
C513
D1-_HDMI1
0. 1uF
C526
0 R569
D1-_HDMI4
0
R513
5V_HDMI_4
CK+_HDMI4
005:AH 20
QJ41193-CFEE1-7F
JK502
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
47K
R559
2K
R542
AVRL161A1R1NT
VR501
OPT
0 R589
0. 1uF
16V
C512
D2-_HDMI2
005:AM14
JP5 03
D2-_HDMI2
0 R588
D1+_HDMI1
D1+_HDMI4
005: AF20
HPD2
AVRL161A1R1NT
VR504
OPT
D1-_HDMI1
005 :Z1 1
D1+_HDMI4
0 R592
0 R599
0
R509
0 R5 74
5V_HDMI_4
001 :AU2 8;0 05:A I18; 005 :AK2 7
D0+_HDMI2
005:AM13
D0-_HDMI2
D2+_HDMI3
005:AG 6
0R503
DDC_SDA_4
D2+_HDMI2
1K
R1504
OPT
CK-_HDMI4
005:AH 20
0
R508
0 R596
47K
OPT
R1505
0. 1uF
16V
C509
9.1 K
R529
+3.3V_HDMI
0. 1uF
C511
3.6 K
R501
OPT
+1.8V_HDMI
DDC_SCL_1
1K
R521
OPT
3.6 K
R502
OPT
0 R526
D2+_HDMI1
0. 1uF
C504
+3.3V _ST
D0+_HDMI2
DDC_SDA_2
HPD4
CK+_HDMI3
005: AE6
GND
D2+_HDMI2
005:AM14
CK-_HDMI3
0 R573
5V_HDMI_4
0
R581
0. 1uF
16V
C520
+1.8V_AMP
DDC_SCL_2
0 R5 72
5V_HDMI_3
47K
R538
0 R5 75
47K
OPT
R1500
D2-_HDMI3
HDMI_RX2+
0. 1uF
16V
C502
OPT
HPD3
005:AD 6
5V_HDMI_3
MMBD301LT1G
D500
HDMI_SDA
DDC_SDA_4
DDC_SCL_4
005:A H20;00 5:AM25
HPD1
0. 1uF
C507
0. 1uF
16V
C500
OPT
0
R544
SSM6N15FU
IC5 01
3
DRAIN2
2
GATE1
1
SOURCE1
4
SOURCE2
5
GATE2
6
DRAIN1
1K
R517
OPT
JP5 07
5V_HDMI_2
CEC_REMOTE
005 :H8 ;00 5:H 17; 005 :L27 ;00 5:R 8;0 05: AM1 1
0 R590
D1+_HDMI3
2K
R541
DDC_SCL_4
0 R5 79
68K
R528
0 R582
DDC_SDA_2
005: Y26;0 05:AM 12
DDC_SDA_3
D0+_HDMI3
12K
R556
CK-_HDMI2
005:AM12
+1.8V_HDMI
CK+_HDMI2
005:AM12
QJ41193-CFEE1-7F
JK501
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
5V_HDMI_1
001 :AT2 8;00 5:Q 22;0 05:A A14
AVRL161A1R1NT
VR500
OPT
4.7 K
R552
OPT
HDMI_RX1+
+3.3V _ST
DDC_SCL_2
0
R519
D2+_HDMI3
0. 1uF
16V
C510
D2+_HDMI4
0 R577
47K
R547
AVRL161A1R1NT
VR506
OPT
HPD1
005 :Z1 3
JP5 05
D0+_HDMI1
005 :Z1 2
47K
OPT
R1507
0
R507
D1+_HDMI2
005:AM14
TDA9996HL
IC502
1
VSS_1
2
OUT_C+
3
OUT_C-
4
VDDO[3V3]
5
OUT_DDC_CLK
6
OUT_DDC_DAT
7
VSS_2
8
VDDC[1V8]_1
9
RXA_HPD
10
RXA_5V
11
RXA_DDC_DAT
12
RXA_DDC_CLK
13
RXA_C-
14
RXA_C+
15
VDDH[3V3]_1
16
RXA_D0-
17
RXA_D0+
18
VSS_3
19
RXA_D1-
20
RXA_D1+
21
VDDH[3V3]_2
22
RXA_D2-
23
RXA_D2+
24
VDDH[1V8]_1
25
NC
26
VSS_4
27
TEST
28
RXB_HPD
29
RXB_5V
30
RXB_DDC_DAT
31
RXB_DDC_CLK
32
RXB_C-
33
RXB_C+
34
VDDH[3V3]_3
35
RXB_D0-
36
RXB_D0+
37
VSS_5
38
RXB_D1-
39
RXB_D1+
40
VDDH[3V3]_4
41
RXB_D2-
42
RXB_D2+
43
VSS_6
44
CDEC_DDC
45
VDDC[1V8]_2
46
VDDC[3V3]
47
MODE
48PD49
SDA/SEL1
50
SCL/SEL0
51
XTAL_IN
52
XTAL_OUT
53
INT/HP_CTRL
54
CDEC_STBY
55
VDDS[3V3]
56
VSS_7
57
CEC
58
RXC_HPD
59
RXC_5V
60
RXC_DDCC_DAT
61
RXC_DDC_CLK
62
RXC_C-
63
RXC_C+
64
VDDH[3V3]_5
65
RXC_D0-
66
RXC_D0+
67
VSS_8
68
RXC_D1-
69
RXC_D1+
70
VDDH[3V3]_6
71
RXC_D2-
72
RXC_D2+
73
VSS_9
74
R12K
75
VDDH[1V8]_2
76
RXD_HPD77RXD_5V78RXD_DDC_DAT79RXD_DDC_CLK80RXD_DC-81RXD_DC+82VDDH[3V3]_783RXD_D0-84RXD_D0+85VSS_1086RXD_D1-87RXD_D1+88VDDH[3V3]_889RXD_D2-90RXD_D2+91VDDC[1V8]_392VSS_1193OUT_D2+94OUT_D2-95VDDO[1V8]96OUT_D1+97OUT_D1-98VSS_1299OUT_D0+
100
OUT_D0-
GND
0 R593
DDC_SCL_3
D0+_HDMI3
005: AF6
4.7 K
OPT
R553
4.7 K
OPT
R554
0
R557
OPT
DDC_SDA_3
005 :AE6 ;005 :AF2 6
0. 1uF
16V
C529
+3.3V _ST
HDMI_CEC
001 :C32
0. 1uF
16V
C506
CEC_REMOTE
005 :H8 ;00 5:H 26; 005 :L27 ;00 5:R 8;0 05: AM1 1
0. 1uF
16V
C523
JP5 02
D1+_HDMI1
005 :Z1 1
CEC_REMOTE
005 :H8 ;00 5:H 26;0 05: H17 ;00 5:L 27;0 05: AM1 1
47K
OPT
R1503
0 R597
3.6 K
R518
OPT
0
R525
1K
R1501
OPT
47K
R537
HDMI_SCL
0R551
BLM18PG121SN1D
L501
0. 1uF
C517
D2-_HDMI4
+1.8V_HDMI
AVRL161A1R1NT
VR508
5V_HDMI_2
001 :Y20 ;005 :W27 ;005 :AK1 5
0 R591
HPD3
0 R586
0R510
+5V_ST
0
R543
D0+_HDMI4
005:AG 20
DDC_SDA_3
HPD4
005 :AI 20
5V_HDMI_1
1K
R515
OPT
0. 1uF
C525
0 R576
0R523
0 R587
47K
R546
HDMI_RX0+
0. 1uF
16V
C524
DDC_SDA_1
0. 1uF
C528
AVRL161A1R1NT
VR503
OPT
0. 1uF
16V
C519
+3.3V_HDMI
1K
R1506
OPT
0
R504
CK-_HDMI2
DDC_SDA_1
DDC_SCL_2
005: Y25;0 05:AM 12
D0-_HDMI1
005 :Z1 2
AVRL161A1R1NT
VR505
OPT
D2+_HDMI4
005: AF20
KJA -ET -0- 0032
JK503
14
NC
13
CEC
5
DATA1_SHIELD
20
JACK_GND
12
CLK-
11
CLK_SHIELD
2
DATA2_SHIELD
19
HPD
18
+5V_POWER
10
CLK+
4
DATA1+
1
DATA2+
17
DDC/CEC_GND
9
DATA0-
8
DATA0_SHIELD
3
DATA2-
16
SDA
7
DATA0+
6
DATA1-
15
SCL
0
R511
D2-_HDMI1
0
R533
D1-_HDMI3
0R539
0. 1uF
C521
D1+_HDMI2
5V_HDMI_3
3.6 K
R500
OPT
0
R514
CK-_HDMI1
HDMI_CLK+
R549
TDA9996_SDA
D2-_HDMI4
005: AF20
D1-_HDMI3
005: AF6
0
R571
0 R570
0 R598
D1+_HDMI3
005: AF6
AVRL161A1R1NT
VR507
OPT
JP5 04
D2-_HDMI1
005 :Z1 1
0 R595
0
OPT
R555
HDMI_RX2-
CEC_REMOTE
005 :H8 ;00 5:H2 6;0 05: H17 ;005 :R8 ;00 5:A M11
DDC_SCL_3
005 :AE6 ;005 :AF2 5
DDC_SCL_4
47K
R561
DDC_SDA_1
005 :R1 9;0 05: Y13
D1-_HDMI2
005:AM13
0. 1uF
C516
0
OPT
R527
CK-_HDMI4
D0+_HDMI4
+3.3V _ST
0. 1uF
16V
C522
QJ41193-CFEE1-7F
JK500
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
TDA9996_SCL
0 R5 80
+3.3V_HDMI
0
R505
D1-_HDMI2
0
R512
D0-_HDMI2
005:AM13
0. 1uF
C527
0 R5 78
0R5 06
0
R520
HDMI_RX0-
0. 1uF
16V
C518
D0-_HDMI3
005: AF6
0. 1uF
16V
C505
OPT
1K
R516
OPT
5V_HDMI_2
0. 1uF
C514
0 R585
0. 1uF
16V
C503
D0-_HDMI4
CB3216PA501E
L500
CK+_HDMI3
DDC_SCL_1
005 :R2 0;0 05: Y13
DDC_SDA_4
005:A H20;00 5:AM25
JP5 06
HDMI
2 1 4
Mstar(M+S)
09 . 0 3. 1 3
LEE GI YO UNG ˙
HDMI S/W For MSTAR Platform
For Onl y T DA99 96 E S3
SIDE_HDMI_PORT4
UI_HW_PORT3
VA RIST ORS( VR5 00/5 01/5 02/ 503/ 504 /505 /506 /50 7) o n li nes -HPD 1/2 /3/4 are al l op tion s
* HDMI CEC
Ne t L ab el s c ha ng ed fo r HDM I2
in ca se HD MI Swi tc h d oes n’t s upp ort ’ ESD pr ote ct ion ’
UI_HW_PORT1
UI_HW_PORT2
Ne t L ab el s c ha ng ed fo r HDM I3
ED I D P ull-up
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