LG 39LB5600 Service Manual page 29

ATSC tuner block
TU3700
TDSS-H501F(B)
NC_1
1
RESET
2
SCL
3
SDA
4
+B1[3.3V]
5
NC_2
6
+B2[1.8]
7
NC_3
8
IF_AGC
9
DIF[P]
10
DIF[N]
11
B1 A1
B1 A1
12
SHIELD
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.
Copyright ⓒ 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Close to the tuner
+3.3V_TU
C3701
0.1uF
16V
R3733
100K
R3732
100
TUNER_RESET
C3710
0.1uF
16V
R3735
R3736
C3711 C3713
18pF 18pF
50V 50V
R3761 0
IF_P_MSTAR
R3760 0
IF_N_MSTAR
1. should be guarded by ground
Close to the tuner
2. No via on both of them
3. Signal Width >= 12mils
Signal to Signal Width = 12mils
Ground Width >= 24mils
+1.8V_TU
C3737 C3738
100pF 0.1uF
50V 16V
R3704 100
should be guarded by ground
C3716
0.1uF
16V
+3.3V_TU
R3740 R3741
1.8K 1.8K
+3.3V_TU
33
TU_SCL
33
TU_SDA
OPT OPT
C3742 C3743
20pF 20pF
50V 50V
+3.3V_TU
C3708
C3707
100pF 0.1uF
50V 16V
C3717
0.1uF
16V
IF_AGC_MAIN
+3.3V_Normal
L3703
UBW2012-121F
C3725 C3715
C3723 C3727
0.1uF 22uF 0.1uF
22uF
16V 6.3V 16V
6.3V
+3.3V_TU
IC3703
+1.8V_TU
AP1117E18G-13
3 1
IN ADJ/GND
OUT
2
R3766
1
C3740
0.1uF
C3741
16V
10uF
10V
85C
NC4_S7LRM
TUNER_NON_EU
2012.06.21
14
LGE Internal Use Only