LG 32LF550B Service Manual page 24

GLOBAL tuner block KR & AJ
TU_AJ_T/C
A1
A1
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 © 2015 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TU_ATSC
TU1601
TU1601-*1
TDJH-H301F
TDJH-G301D
+3.3V
1
NC_1
+3.3V
2
1
IF_AGC
3
SCL_RF NC_1
4
2
SDA_RF
5
IF[P] DIF_AGC
6
3
IF[N]
7
SIF
SCL_RF
8
4
CVBS
9
SDA_RF
5
B1
B1
47 DIF[P]
6
SHIELD
DIF[N]
7
SIF
8
CVBS
9
A1 B1
A1 B1
47
SHIELD
GND seperation for ASIS tuner
+3.3V_TU
C1615 C1616
100pF 0.1uF
50V 16V
close to the tuner pin, add,09029
R1607
R1608
C1610
C1609 18pF
R1605 0 50V
IF_FILTER_AJ 18pF
R1605-*1 50V
IF_NON_FILTER_KR
10
R1606 0
IF_FILTER_AJ
R1606-*1
IF_NON_FILTER_KR
10
Close to the tuner
R1612 0
OPT
R1613 0
OPT
TU_GND_A
TU_GND_Cap
C1617
1000pF
630V
TU_GND_A
R1609
100
IF_AGC_MAIN
should be guarded by ground
C1611
0.1uF
16V
R1610-*1
1K
TU_IIC_NON_ATSC_1K
+3.3V_TU
R1611-*1
1K
TU_IIC_NON_ATSC_1K
R1610 R1611
1.8K 1.8K
TU_IIC_ATSC_1.8K TU_IIC_ATSC_1.8K
33
TU_SCL
33
TU_SDA
OPT
OPT
C1613 C1614
20pF 20pF
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
FE_AGC_SPEED_CTL
FE_TS_SYNC
IF_AGC_SEL
FE_TS_VAL_ERR TUNER_RESET
FE_TS_CLK RF_SWITCH_CTL
FE_TS_DATA[0]
TU_CVBS
TU_SIF
+3.3V_Normal
+3.3V_TU
Size change,0929
L1600
UBW2012-121F
C1603 C1605
C1602 C1607
0.1uF 22uF 0.1uF
22uF
16V 6.3V 16V
6.3V
CHANGE TO CHANGE TO
6.3V 2012 X5R 6.3V 2012 X5R
L14_CA_M1A 140730
TUNER_KR_AJ 16
LGE Internal Use Only