LG 42LB550A, Service Manual

Page: 16 / 58

U
S
B
D
O
W
N
S
T
R
E
A
M
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE
SYMBOL MARK OF THE SCHEMETIC.
G
N
D
+5V_USB
ZD221
30V
READY
ZD220
30V
READY
USB_DP
USB_DN
C220
10uF
10V
OPT
C221
22uF
10V
R204
0
W
/
O
U
A
R
T
I
C
C203
0.1uF
With UART IC
IC201
MAX3232CDR
EAN41348201
With UART IC
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
R205
0
W
/
O
U
A
R
T
I
C
JK201
KJA-PH-1-0177
3 M3_DETECT
4 M4
5 M 5 _ G ND
1 M1
6 M6
C205
0.1uF
With UART IC
C202
0.1uF
With UART IC
R202
100
With UART IC
D
S
U
B
_
S
C
L
C201
0.1uF
P201
12505WS-04A00
DEBUG
1
2
3
4
5
P202
12507WS-04L
1
VCC
2
PM_RXD
3
GND
4
RM_TXD
5
GND
D
S
U
B
_
S
D
A
R201
100
With UART IC
C204
0.1uF
With UART IC
HDMI1_D0-
JK203
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 HDMI1_SCL
Q230
MMBT3904(NXP)
E
B
C
R230
10K
H
R233
2.7K
+5V_USB
R232
2.7K
HDMI1_D1-
H
H
HDMI1_CK-
HDMI1_SDA
HDMI1_D2-
HDMI1_HPD
R231
1K
H
H
HDMI2_HPD
HDMI2_SCL
+5V_USB
HDMI2_D1-
HDMI2_CK-
Q240
MMBT3904(NXP)
E
B
C
R242
1K
R241
10K
HDMI2_D0-
HDMI2_D2-
H
JK204
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
HDMI2_SDA
R243
2.7K
R244
2.7K
H
H
ZD230
READY
ZD231
READY
ZD232
READY
ZD233
READY
R236
100
R237
100
ZD240
READY
ZD241
READY
ZD242
READY
ZD243
READY
R247
100
R248
100
L220
120OHM
JK202
3AU04S-305-ZC-(LG)
1
2
3
4
5
+3.5V_ST
+3.5V_ST
R206
100
W/O UART IC
H
D
M
I
2
_
D
E
T
+3.5V_ST
D
2
4
2
3
0
V
R
E
A
D
Y
R
2
4
6
1
0
K
R
2
4
5
1
0
K
D
2
4
1
3
0
V
R
E
A
D
Y
+3.5V_ST
HDMI1_DET
D234
IP4283CZ10-TBA
ESD_HDMI2_IP4283
3
GND_1
2
T
4
TMDS_CH2-
1
TMDS_CH1-
5
T
6
NC_1
7
NC_2
8
GND_2
9
NC_3
10
NC_4
D235
IP4283CZ10-TBA
ESD_HDMI2_IP4283
3
GND_1
2
T
4
TMDS_CH2-
1
TMDS_CH1-
5
T
6
NC_1
7
NC_2
8
GND_2
9
NC_3
10
NC_4
D244
IP4283CZ10-TBA
ESD_HDMI2_IP4283
3
GND_1
2
T
4
TMDS_CH2-
1
TMDS_CH1-
5
T
6
NC_1
7
NC_2
8
GND_2
9
NC_3
10
NC_4
D245
IP4283CZ10-TBA
ESD_HDMI2_IP4283
3
GND_1
2
T
4
TMDS_CH2-
1
TMDS_CH1-
5
T
6
NC_1
7
NC_2
8
GND_2
9
NC_3
10
NC_4
D234-*1
IP4294CZ10-TBR
ESD_HDMI_IP4294
1
8
2
7
3
6
4
5
9
10
D235-*1
IP4294CZ10-TBR
ESD_HDMI_IP4294
1
8
2
7
3
6
4
5
9
10
D244-*1
IP4294CZ10-TBR
ESD_HDMI_IP4294
1
8
2
7
3
6
4
5
9
10
D245-*1
IP4294CZ10-TBR
ESD_HDMI_IP4294
1
8
2
7
3
6
4
5
9
10
2 7
INPUT2
Close to SIDE_USB
USB(SIDE)
I2C Control
HDMI(REAR)
EAX65550501
32/42LB550A
2013/08/15
LB45B/LT5B