LG 24LN451B Service Manual page 31

GLOBAL tuner block except EU and China
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.
Copyright ⓒ 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
KR/US(WO AD)
TU3700
TDSS-H501F(B)
(KR/US)SI2158_ATSC_1INPUT_H
+3.3V_TU
R3733
100K
12.08.14
R3732
diagonal noise improve
100
NC_1
1
OPT
C3710
RESET C3703
0.1uF
2 0.1uF 16V
16V
SCL
3
SDA
4
+B1[3.3V]
5
NC_2
6
+B2[1.8]
7
NC_3
8
IF_AGC
9
DIF[P]
10 R3761 10
DIF[N]
11 R3760 10
B1 A1
B1 A1
Close to the tuner
12
SHIELD
+3.3V_TU
TUNER_RESET
R3740 R3741
1.8K 1.8K
R3735 33
R3736 33
OPT
OPT
C3711 C3713 C3742 C3743
18pF 18pF 20pF 20pF
50V 50V 50V 50V
IF_P_MSTAR
IF_N_MSTAR
1. should be guarded by ground
2. No via on both of them
3. Signal Width >= 12mils
Signal to Signal Width = 12mils
Ground Width >= 24mils
121118
SS BEAD->SUNLORD BEAD
L3707
+1.8V_TUNER 130118
option DEL
C3707
100pF
50V
C3737 C3738 C3705
100pF 0.1uF 100uF
50V 16V 16V close to the tuner pin, add,09029
OPT
R3704 100
IF_AGC_MAIN
C3716 should be guarded by ground
0.1uF
16V
+3.3V_TU
+3.3V_Normal
121118
SS BEAD->SUNLORD BEAD
Size change,0929
L3703
60mA
UBW2012-121F
C3723 C3725 C3715 C3727
22uF 0.1uF 22uF 0.1uF
6.3V 16V 6.3V 16V
Add,0929
NC4_S7LRM
TUNER_NON_EU
TU_SCL
TU_SDA
+3.3V_TU
C3708
C3706
0.1uF 100uF
16V
16V
OPT
EAX65410201
2012.11.18
26 12
LGE Internal Use Only