LG C42PW120-WA (CHASSIS:PC21A) Service Manual ▷ View online
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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 safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components 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
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.
HDMI
CK+_HDMI
D0+_HDMI
BSS83
Q305
READY
S
B
D
G
D1+_HDMI
R327
0
READY
0
READY
CK-_HDMI
R329
0
READY
CEC_REMOTE
HDMI_CEC_LM1
D2-_HDMI
HDMI_DDC_SDA
D2+_HDMI
D1-_HDMI
+3.3V
HDMI_DDC_SCL
CEC_REMOTE
D0-_HDMI
JP301
R324
68K
READY
JP300
R318
1K
Q304
MMBT3904(NXP)
E
B
C
D300
BAT54_SUZHO
READY
READY
R314
33
R315
33
+5V
R313
10K
R303
10K
R328
10K
R330
10K
HPD_HDMI
DVI_D1+
C345
0.1uF
DVI_D0+
DVI_D1+_OUT
DVI_DET
L312
ACM2012-900H-2P
1
2
3
4
R361 12
L310
ACM2012-900H-2P
1
2
3
4
R365 12
+3.3V_ST
DVI_CK-_OUT
L313
ACM2012-900H-2P
1
2
3
4
DVI_CK-
DVI_CK+
R362 12
HPD_DVI_OUT
DDC5VD
L311
ACM2012-900H-2P
1
2
3
4
DVI_DDC_SCL
HPD_DVI
DVI_D2-_OUT
DVI_D2+_OUT
R364 12
TX1DSDA
DVI_D2+
TX1DSCL
DVI_CK+_OUT
DVI_D0+_OUT
DVI_D0-
R358
100
READY
R363 12
DVI_D1-_OUT
DVI_D2-
DVI_D1-
DVI_D0-_OUT
R393
470
READY
D303
30V
READY
R366 12
DVI_DDC_SDA
TX1DSDA
C329
1uF
C313
0.1uF
0.1uF
VDDA_33_S
R352
10
C318
10uF
10uF
VDDT_12B_S
R343
10
DVI_D0+
D0-_HDMI
C306
10uF
C341
0.1uF
0.1uF
DVI_D0-
C322
2.2uF
16V
2.2uF
16V
+3.3V_ST
C342
0.1uF
0.1uF
R323
4.7K
READY
C320
10uF
VDD_12_S
SBVCC5
C307
10uF
C311
0.1uF
C324
0.1uF
0.1uF
C314
10uF
22uF
C333
C304 0.1uF
SBVCC5
R332
4.7K
4.7K
DVI_D2-_OUT
C310
10uF
Q301
MMBT3904(NXP)
READY
E
B
C
C316
10uF
C303
0.1uF
HDMI_DDC_SCL
HPD_DP1
VDD_12_S
DVI_D2-
DVI_D1-_OUT
SBVCC5
C301
10uF
R340
0
DIGITAL_DPM_CTRL
C319
0.1uF
VDDA_33_S
C302
10uF
DP_CLKP
DVI_D0-_OUT
DP_DDC_SCL
R356
4.7K
VDD_12_S
DP_D1P
C334
1uF
DVI_CK+_OUT
R322
4.7K
READY
VDDA_12_S
Q300
MMBT3906(NXP)
MMBT3906(NXP)
READY
E
B
C
DVI_DDC_SDA
DP_D0N
RX1+
C308
0.1uF
D2-_HDMI
DP_D2P
DVI_CK+
INT_9489
R300
0
VDDA_33_S
VDD_33_S
VDDT_12B_S
C335
1uF
25V
25V
RX0-
RXC-
D0+_HDMI
R302
4.7K
READY
C325
0.1uF
RX2+
R359
4.7K
R335
10
DVI_DDC_SCL
DVI_D2+
RESET_9489
C338
0.1uF
C330
1uF
TX1DSCL
CK-_HDMI
R301
4.7K
READY
HPD_DVI_OUT
C305
0.1uF
R316
4.7K
4.7K
READY
C331
0.1uF
D1+_HDMI
R360
4.7K
HDMI_DDC_SDA
DVI_D1-
DVI_D1+_OUT
R341
0
C340
0.1uF
0.1uF
VDD_12_S
SBVCC5
R317
4.7K
READY
DVI_D2+_OUT
DP_DDC_SDA
Q303
AO3407A
G
D
S
HPD_DVI
DP_D1N
DVI_D0+_OUT
VDDT_12A_S
HPD_HDMI
DP_CLKN
DVI_CK-_OUT
C332
0.1uF
DVI_CK-
R326
100K
100K
+5V_HDMI
VDDA_12_S
DP_D2N
D1-_HDMI
VDD_33_S
C328
0.1uF
C300
0.1uF
DP_D0P
RXC+
RX0+
C336
1uF
CK+_HDMI
C343
0.1uF
Q306
MMBT3904(NXP)
E
B
C
C321
2.2uF
16V
R320
10K
10K
READY
C309
10uF
VDDA_12_S
C317
0.1uF
0.1uF
DVI_D1+
Q302
MMBT3904(NXP)
READY
E
B
C
C323
10uF
10uF
RX2-
RX1-
VDDT_12A_S
C327
10uF
VDDA_33_S
D2+_HDMI
VDDA_12_S
C312
10uF
10uF
C326
100uF
25V
VDDA_33_S
C337
10uF
10V
C315
0.1uF
DDC5VD
R304
22
READY
R307
2.7
R312
2.7
R309
2.7
R306
2.7
R311
2.7
R310
2.7
R308
2.7
R305
2.7
HDMI_DET
+5V_HDMI
VDDA_33
AUXDCP
DPX3N
DP_DDC_SCL
0.1uF
C377
R384
1M
C363
0.1uF
DPX0N
DPX3P
C386
0.01uF
VDD_33
0.1uF
C365
R389
10K
VDD_33
VDD_12
C353
4.7uF
10V
IR0MD
C351
0.1uF
0.1uF
C372
VDDA_33
HPD_DP
C395
1uF
10V
10V
R1330
4.7K
4.7K
R13334.7K READY
R1328
4.7K
4.7K
DPX2P
DPX1P
AUXN
R386
10K
C350
0.1uF
16V
0.1uF
16V
IR0MS
C346
100uF
25V
25V
R1305
4.7K
4.7K
VDDA_33
D314
40V
RB160M-40
READY
C366
0.01uF
0.01uF
DP_D0P
AUXP
C355
0.01uF
0.01uF
C348
1uF
DP_D1P
R378
1M
AUXDCP
JK304
3VD51203-L7JJ-9H
14
14
13
13
5
5
12
12
11
11
2
2
19
19
18
18
10
10
4
4
1
1
17
17
9
9
8
8
3
3
16
16
7
7
6
6
15
15
20
20
21
SHIELD
IC305
TJ4220GDP-ADJ
DP
3
VIN3
2
EN2
4
NC4
1
NC_1
5
NC_2
6
VOUT
7
ADJ/SENSE
8
GND
9
[EP]GND
0.1uF
C356
16V
C392
0.01uF
C387
0.1uF
DPX1N
IR0MC
C364
1uF
10V
1uF
10V
R379
10K
C347
100uF
25V
VDD_33
0.1uF
C370
VDD_33
C390
0.01uF
0.01uF
VDDRX_12
IC301
PS161
DP
1
GND_1
2
DRX0P
3
DRX0N
4
VDDRX_1
5
DRX1P
6
DRX1N
7
VDD33_1
8
RST#
9
PD#
10
GND_2
11
DRX2P
12
DRX2N
13
VDDRX_2
14
DRX3P
15
DRX3N
16
VDD12_1
17
XTLI
18
XTLO
19
VDD33_2
20
GPIO0/TS_CKO
21
VDD12_2
22
VDDA33
23
REXT
24
GND_3
25
VDDA12
26
GPIO1/MSDA
27
GPIO2/MSCL
28
CSDA
29
CSCL
30
INTRQ/GPIO3
31
HDMI_SCL
32
HDMI_SDA
33
HDMI_CLKN
34
HDMI_CLKP
35
GND_4
36
HDMI_D0N
37
HDMI_D0P
38
VDD33_3
39
HDMI_D1N
40
HDMI_D1P
41
VDD12_3
42
HDMI_D2N
43
HDMI_D2P
44
TESTMODE
45
GPIO4
46
GPIO5
47
GPIO6
48
GND_5
49
VDD33_4
50
HDMI_HPD
51
IROMW/GPIO7
52
IROMQ
53
IROMS
54
IROMC
55
IROMD
56
GND_6
57
DP_HPD
58
VDD12_4
59
DAUXN
60
DAUXP
61
DAUXDCN
62
DAUXDCP
63
NC_1
64
NC_2
C380
22uF
10V
22uF
10V
IR0MD
IR0MW
R385
1M
READY
C396
22uF
10V
22uF
10V
VDD_12
DPX1P
C352
0.1uF
0.1uF
R387
10K
DP_CLKN
DPX0N
VDD_12
D310
40V
RB160M-40
RB160M-40
READY
C378
22uF
10V
22uF
10V
C367
0.1uF
16V
0.1uF
16V
DP_CLKP
C399
0.1uF
50V
C389
0.01uF
IR0MQ
+3.3V_PS161
C354
0.01uF
0.01uF
VDDA_33
0.1uF
C368
C362
22uF
VDD_12
AUXDCN
AUXDCN
DP_DDC_SDA
C393
0.1uF
DPX3P
R388
10K
VDD_33
VDDA_12
IR0MW
HPD_DP1
R13324.7K READY
AUXP
C391
0.1uF
R1307
4.7K
READY
X300
27MHz
DPX2P
C361
0.01uF
0.01uF
R381
10K
AUXN
DP_D0N
C384
0.01uF
R380
10K
SCL1
R1304
4.7K
4.7K
READY
DP_D2N
DPX3N
R377
1M
READY
IR0MC
C382
0.1uF
DPX1N
DPX2N
C360
22uF
SDA1
IR0MQ
0.1uF
C375
C349
10uF
10V
10uF
10V
VDD_12
DPX2N
C388
0.1uF
VDDA_12
DPX0P
HPD_DP
0.1uF
C371
R374
1K
C379
22uF
10V
22uF
10V
R1325
4.7K
4.7K
SDA1
C381
0.1uF
C394
0.01uF
0.1uF
C374
IR0MS
DPX0P
C383
0.1uF
C385
0.01uF
R13314.7K READY
C358
0.01uF
0.01uF
DP_D1N
VDDRX_12
IC304
W25X20BVSNIG
DP
3
WP
2
DO
4
GND
1
CS
5
DIO
6
CLK
7
HOLD
8
VCC
SCL1
0.1uF
C373
R1329
4.7K
READY
4.7K
READY
VDDA_33
0.1uF
C376
DP_D2P
C359
0.1uF
C357
0.1uF
R382
10K
L309
120
120
L315
120
120
L308
120
120
L301
120
120
L303
120
120
L302
120
120
L304
120
120
L300
120
120
L307
120
120
L305
120
120
L316
120
120
L314
120
PD_PS161
RESET_PS161
JK301
QH01121-D2WS-4F
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
JK302
QH01121-D2WS-4F
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
JK300
YKF45-7054V
14
NC
13 CEC
5
DATA1_SHIELD
20
SHIELD
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
9489_SDA
9489_SCL
L317
120
L318
120
+3.3V_9489
+3.3V_ST
P300
SMW250-03
DP
1
2
3
D301
6.5VTO11.0V
RCLAMP0544T.TCT
1
8
2
7
3
6
4
5
9
D302
6.5VTO11.0V
RCLAMP0544T.TCT
RCLAMP0544T.TCT
1
8
2
7
3
6
4
5
9
D304
6.5VTO11.0V
RCLAMP0544T.TCT
1
8
2
7
3
6
4
5
9
D305
6.5VTO11.0V
RCLAMP0544T.TCT
1
8
2
7
3
6
4
5
9
D312
6.5VTO11.0V
RCLAMP0544T.TCT
1
8
2
7
3
6
4
5
9
D313
6.5VTO11.0V
RCLAMP0544T.TCT
1
8
2
7
3
6
4
5
9
D311
6.5VTO11.0V
RCLAMP0544T.TCT
1
8
2
7
3
6
4
5
9
+3.3V_PS161
+3.3V_PS161
+3.3V_PS161
+3.3V_PS161
+3.3V_PS161
+3.3V_PS161
+3.3V_PS161
+3.3V_9489
+3.3V_9489
L306
120
+5V_ST
+5V_9489
+5V_9489
+5V_9489
+5V_9489
D309
6.5VTO11.0V
RCLAMP0544T.TCT
1
8
2
7
3
6
4
5
9
D308
6.5VTO11.0V
RCLAMP0544T.TCT
1
8
2
7
3
6
4
5
9
R370
0
R372
0
0
R383
0 READY
R1323
0
R1327
0
R342
1
1
R390
1
1
R391
1
1
R392
1
1
R333
10
9489_EDID
R334
10
9489_EDID
R336
10
R345
10
R346
10
9489_EDID
R347
10
9489_EDID
R348
10
9489_EDID
R349
10
R350
10
9489_EDID
R357
10
R1312
10
R1313
10
R367
22
R371
22
22
R1309
22
R1311
22
R1314
22
R1315
22
R1317
22
R1318
22
22
R1321
22
R337 33
R338 33
R368
33
R369
33
R355
1K
1K
READY
R1303
1K
R13061K
R375
10K
1%
R351
10K
READY
R394
10K
R1302
10K
10K
R1301
1M
1M
R319
1.8K
R376
20K
1%
R321
3.3K
3.3K
R373
3.3K
3.3K
1/16W
5%
5%
R325
470K
470K
R1308
4.99K
R331
5.1K
R339
5.1K
R344
5.1K
5.1K
C339
0.01uF
C344
0.01uF
C398
30pF
30pF
50V
C397
30pF
30pF
50V
D306
ADUC 5S 02 0R5L
READY
D307
ADUC 5S 02 0R5L
READY
D315
ADUC 5S 02 0R5L
D316
ADUC 5S 02 0R5L
IC306
AZ1117BH-1.2TRE1
1
GND/ADJ
2
OUT
3
IN
IC300
SII9489ACTUC
1
AVDD33_1
2
R1XCN
3
R1XCP
4
R1X0N
5
R1X0P
6
R1X1N
7
R1X1P
8
R1X2N
9
R1X2P
10
AVDD33_2
11
R2XCN
12
R2XCP
13
R2X0N
14
R2X0P
15
R2X1N
16
R2X1P
17
R2X2N
18
R2X2P
19
AVDD12_1
20
DVDD12_1
21
R3XCN
22
R3XCP
23
R3X0N
24
R3X0P
25
R3X1N
26
R3X1P
27
R3X2N
28
R3X2P
29
AVDD12_2
30
AVDD33_3
31
R4XCN
32
R4XCP
33
R4X0N
34
R4X0P
35
R4X1N
36
R4X1P
37
R4X2N
38
R4X2P
39
DVDD12_2
40
ARC4
41
ARC3
42
ARC2
43
ARC1
44
ARC0
45
SPDIF_IN
46
ETH_RXP
47
ETH_RXN
48
HEACP
49
HEACN
50
ETH_TXP
51
ETH_TXN
52
EPWR33
53
DSDA4
54
DSCL4
55
CBUS_HPD4
56
R4PWR5V
57
DSDA3
58
DSCL3
59
CBUS_HPD3
60
R3PWR5V
61
SPDIF_OUT
62
GPIO10
63
GPIO9
64
GPIO8
65
DSDA2
66
DSCL2
67
CBUS_HPD2
68
R2PWR5V
69
GPIO7
70
GPIO6
71
GPIO5
72
GPIO4
73
MICOM_VCC33
74
RSVDL_1
75
CEC_A0
76
CEC_A1
77
RESETB
78
GPIO2
79
GPIO1
80
DSDA1
81
DSCL1
82
CBUS_HPD1
83
R1PWR5V
84
DSDA0
85
DSCL0
86
CBUS_HPD0
87
R0PWR5V
88
DSDA5[VGA]
89
DSCL5[VGA]
90
R5PWR5V[VGA]
91
CSDA
92
CSCL
93
SBVCC5
94
TX1_HPD
95
RSVDL_2
96
INT
97
TX1DSDA
98
TX1DSCL
99
TPWR_CI2CA
100
T1X2P
101
T1X2N
102
T1X1P
103
T1X1N
104
T1X0P
105
T1X0N
106
T1XCP
107
T1XCN
108
TCVDD12
109
TPVDD12
110
T0X2P
111
T0X2N
112
T0X1P
113
T0X1N
114
T0X0P
115
T0X0N
116
T0XCP
117
T0XCN
118
DVDD12_3
119
AVDD33_4
120
R0XCN
121
R0XCP
122
R0X0N
123
R0X0P
124
R0X1N
125
R0X1P
126
R0X2N
127
R0X2P
128
AVDD12_3
129
[EP]GND
R353
4.7K
R354
4.7K
4.7K
+3.3V_PS161
3 5
HDMI/DVI/DP
EAX
LM1
HDMI_JACK
HDMI
DVI OUT
DVI IN
T1X1N
OUT
T1X0N
DVI IN
T1X1P
T1X2P
T1X0P
SII9489
HDMI
DVI OUT
T1XCN
T1XCP
T1X2N
DP
AUX_CH-
GND0
GND1
DISPLAY PORT
ML_LANE_1-
ML_LANE_2+
ML_LANE_2-
GND4
ML_LANE_3-
ML_LANE_0+
HOT_PLUG
ML_LANE_0-
GND2
ML_LANE_1+
CA_DET
DVI_DET/CEC
DP_PWR[3.3V]
ML_LANE_3+
DP->PS161HDEMTQFP64G
RETURN
GND3
AUX_CH+
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