LG 42LB550A, Service Manual

Page: 18 / 58

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.
IF_N
C402
47pF
50V
C403
47pF
50V
IF_P
C410
0.1uF
16V
IF_AGC
R412
100
+3.3V_M
C405
0.1uF
16V
C411
0.1uF
16V
+3.3V_TU
+3.3V_TU
L421
BLM18PG121SN1D
IR
+3.5V_ST
C423
0.1uF
16V
KEY1
KEY2
C425
0.1uF
16V
OPT
C422
0.1uF
OPT
C421
0.1uF
OPT
C426
100pF
50V
+3.5V_ST
C424
1000pF
50V
LED
C404
22uF
6.3V
100pF
C406
50V
TUNER_SCL
TUNER_SDA
L401
BLM18PG121SN1D
R421
10K
R422
10K
R407
2.2K
R408
2.2K
R405
33
R406
33
C412
10uF
6.3V
R413
10
PAL
R414
10
PAL
R413-*1
0
NTSC
R414-*1
0
NTSC
ZD401
SD05
ZD402
SD05
R423
3.3K
OPT
TU401
TDJH-G101D
PA L
47
SHIELD
6
IF[P]
7
IF[N]
8
NC_2
9
NC_3
1
B1[+3.3V]
2
NC_1
3
IF_AGC
4
SC L
5
SD A
A1
A1
B1
B1
P421
12507WR-10L
1
2
3
4
5
6
7
8
9
10
11
ZD404
IR_Zener
ZD403
LED_R_Zener
TDJH-H101F
TU403
NTSC
47
SHIELD
6
IF[P]
7
IF[N]
8
NC_2
9
NC_3
1
B1[+3.3V]
2
NC_1
3
IF_AGC
4
SCL
5
SDA
A1
A1
B1
B1
TUNER & IR
4 8
close to the tuner pin.
IR/LED+Control
IF
should be guarded by ground
Close to the tuner
EAX65550501
32/42LB550A
2013/08/15
LB45B/LT5B