Read LG 50PK550-SA (CHASSIS:PB01A) Service Manual 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.
DSUB_DET
DDC_SDA
DDC_SCL
100
R930
0.1uF
50V
C915
+3.3V_ST
0.1uF
50V
C918
0.1uF
50V
C919
MAX3232CDR
IC902
3
-
1
C
2
+
V
4
+2
C
1
+1
C
6
-
V
5
-
2
C
7
2T
U
O
D
8
2
NI
R
9
2T
U
O
R
0
1
2
NI
D
1
1
1
NI
D
2
1
1T
U
O
R
3
1
1
NI
R
4
1
1T
U
O
D
5
1
D
N
G
6
1
C
C
V
0.1uF
50V
C920
1
0
0
R
93
1
RS232C_TXD
+3.3V_ST
RS232C_RXD
0.1uF
50V
C914
PC_L_IN
PC_R_IN
KEY2
+3.3V_ST
KEY1
LED_WHITE
ADUC30S03010L_AMODIODE
30V
READY
D910
ADUC30S03010L_AMODIODE
30V
READY
D911
LED_BREATHING
MLB-201209-0120P-N2
L901
PK950
D3.3V
10pF
C925
10pF
C927
10pF
C923
10pF
C926
10pF
C929
PK950
SUB_SDA
10pF
C924
D914
10pF
C917
READY
10pF
C916
READY
D3.3V
LED_RED
22
R936
SUB_SCL
0.1uF
16V
C921
0.1uF
16V
C922
S
P
G
09
-D
B
-0
09
JK
9
0
2
1
2
3
4
5
6
7
8
9
1
0
4.7K
R926
MLB-201209-0120P-N2
L904
22
R935
22
R934
10K
R928
10K
R927
4.7K
R925
4.7K
R922
4.7K
R923
0
R941
READY
0
R940
READY
RGB_HSYNC
003:C5
RGB_VSYNC
003:C5
47K
R938
10K
R933
+3.3V_ST
+3.3V_ST
2SC3052
Q902 E
B
C
22
R924
47K
R932
47K
R937
0
READY
R929
2SC3052
Q901
E
B
C
+3.3V_ST
2.2K
R939
+3.3V_ST
IR
PK550
L900
CDS3C05HDMI1
5.6V
D912
CDS3C05HDMI1
5.6V
D913
1
0
R
92
0
S
P
G
09
-D
B
-0
10
JK
9
0
1
1
R
ED
2
G
R
EE
N
3
B
LU
E
4
G
N
D
_1
5
D
D
C
_G
N
D
6
R
ED
_G
N
D
7
G
R
EE
N
_G
N
D
8
B
LU
E_
G
N
D
9
N
C
1
0
SY
N
C
_G
N
D
1
1
G
N
D
_2
1
2
D
D
C
_D
A
TA
1
3
H
_S
Y
N
C
1
4
V
_S
Y
N
C
1
5
D
D
C
_C
LO
C
K
1
6
SH
IL
E
D
C
D
S3
C
30
G
T
H
D
90
5
0.1uF
50V
C906
5.6V
D908
1/
10
W
1K
5%
R
91
9
30V
D904
2
7
0
p
F
50
V
R
EA
D
Y
C
91
0
EDID_WP
001:H5
1/10W
22
5%
R913
BLM18PG600SN1D
RGB_BEAD
R911-*1
47pF
50V
READY
C901
C
D
S3
C
30
G
T
H
30V
D
90
7
0.1uF
C903
18pF
50V
C908
0
RGB_R
R912
1K
R921
2
.7
K
R
9
1
6
10
K
R
90
9
2
7
0
p
F
50
V
R
EA
D
Y
C
91
3
30V
D903
PC_SER_CLK
002:G3
AT24C02BN-10SU-1.8
IC901
3
A2
2
A1
4
GND
1
A0
5 SDA
6 SCL
7 WP
8 VCC
22
R902
8
2
p
F
R
EA
D
Y
50
V
C
91
2
22
R900
0
RGB_R
R911
22
R901
KRC102S
Q900
E
B
C
BLM18PG600SN1D
RGB_BEAD
R910-*1
5.5V
D902
1/10W
22
5%
R914
5.5V
D900
5.6V
READY
D909
0
RGB_R
R910
BLM18PG600SN1D
RGB_BEAD
R912-*1
8
2
p
F
R
EA
D
Y
50
V
C
90
9
10
K
R
90
6
K
7.
2
5
1
9
R
PC_SER_DATA
002:G3
100pF
50V
C911
74F08D
IC900
3
Q0
2
D0B
4
D1A
1
D0A
6
Q1
5
D1B
7
GND
8 Q2
9 D2A
10 D2B
11 Q3
12 D3A
13 D3B
14 VCC
22
R903
5.6V
READY
D906
1
0
R
91
7
47pF
50V
READY
C900
5.5V
D901
47pF
50V
READY
C902
18pF
50V
C907
2.7K
R918
RGB_B
RGB_R
RGB_G
PEJ027-01
JK900
6B T_TERMINAL2
7B B_TERMINAL2
5 T_SPRING
4 R_SPRING
7A B_TERMINAL1
6A T_TERMINAL1
3 E_SPRING
47
0K
R
90
4
5.1V
ZD902
1uF
25V
C904
5.1V
ZD901
47
0K
R
90
5
1uF
25V
C905
5.1V
ZD900
5.1V
ZD903
+5V_ST
MLB-201209-0120P-N2
L902
MLB-201209-0120P-N2
L903
MLB-201209-0120P-N2
L905
PK950
NEC_RXD
NEC_TXD
47K
R944
RS232C_TXD
+3.3V_ST
4.7K
R945
BCM_RX
D3.3V
BCM_TX
0.1uF
16V
C930
RS232C_RXD
MC14053BDR2G
0ISTL00024A
IC903
3
Z1
2
Y0
4
Z
1
Y1
6
INH
5
Z0
7
VEE
8
VSS
9
C
10
B
11
A
12
X0
13
X1
14
X
15
Y
16
VDD
D3.3V
12507WR-03L
P903
PK950
1
2
3
4
12507WR-12L
P902
1
IR
2
GND
3
KEY1
4
KEY2
5
LED-RED
6
GND
7
SCL
8
SDA
9
GND
10
3.3V_ST
11
3.3V_MULTI
12
LED-WHITE
13
GND
IR_NEC
4.7K
READY R946
4.7K
READY
R947
D3.3V
SUB_SCL
SUB_SDA
0
R
EA
D
Y
94
9
R
0
84
9
R
1/
16
W
1K
5%
R951
1/16W
1K
5%
R950
D3.3V
P_+5V
P_+5V
P_+5V
P_+5V
IR_NEC
ROM DOWNLOAD FOR PDP
RS232C
$0.179
SUB Board I/F
1 0 1 3
LVDS/RS232//RGB
FOR PK/J90 - BREATING
EAX61354901
R,G,B PC INPUT
BCM Reference
PC AUDIO
TO HDMI JACK FOR WIRELESS
X1 Y1 S7M
OUTPUT
TO HDMI JACK FOR WIRELESS
RS232 DEBUG SWITCH
- NEC/S7
HIGH
LOW X0 Y0 NEC
A/B
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