LG 32LV355T Service Manual page 38

LGIT CAN EU T2
TU2801
TDFR-G236D
close to TUNER
NC_1
1 R2801
C2802
BST_CNTL 0.1uF
2
16V
+B1[5V]
3
NC_2[RF_AGC]
4 R2802 0
OPT
NC_3
5 OPT
C2804
SCLT
0.1uF
6
SDAT
7
NC_4
8
SIF
9
NC_5
10
VIDEO
11
GND
12
+B2[1.2V]
C2801 C2805
13
100pF 0.1uF
50V 16V
+B3[3.3V]
14
RESET
15
+B4[2.5V]
16
SCL
17
SDA
18
ERR
19
SYNC
20
VALID
21
MCL
22
D0
23
D1
24
D2
25
D3
26
D4
27
D5
28
D6
29
D7
30
31
SHIELD
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 © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
RF_SWITCH_CTL
Pull-up can't be applied
because of MODEL_OPT_2
close to TUNER
OPT
R2803 0
CONTROL_ATTEN
+5V_TU
0
L2806
RF_SW_OPT 1008CS-102XJLC
C2813
C2809 C2811
C2807 10uF
0.1uF
0.1uF 10V
100pF
16V
16V OPT
50V
OPT
C
R2815
Q2801 B 10K
close to TUNER 2SC3052
OPT
OPT
E
+1.2V_TU
OPT
R2846
+3.3V_TU
+3.3V_TU
75
OPT
C2806
100uF OPT
R2817
16V
C2810 R2816 100K
C2835
C2808
100
10uF 0.1uF
100pF
16V
50V
C2815
0.1uF
R2818
22
R2819
22
C2812 C2814
18pF 18pF
50V 50V
AR2801
47
1/16W
AR2802
47
1/16W
AR2803
47
1/16W
Close to the CI Slot
+5V_TU
L2802
BOOSTER_OPT
BLM18PG121SN1D
BOOSTER_OPT
R2823
0
Q2802
BOOSTER_OPT
ISA1530AC1
E
R2825
2.2K
B
C
BOOSTER_OPT
2SC3052
C2819
0.01uF
25V
BOOSTER_OPT
OPTION : RF AGC
GPIO must be added.
+3.3V_TU
FE_AGC_SPEED_CTL
IF_AGC_SEL
R2822 R2824
1.2K 1.2K
L2807 270nH
close to TUNER
L2808 270nH
C2818
C2816
C2834 C2833
62pF
62pF
20pF 20pF
50V
50V
50V 50V
+2.5V_TU
+3.3V_TU
TUNER_RESET C2817
0.1uF
16V
R2826
close to Tuner
4.7K
should be guarded by ground
FE_TS_DATA[0-7]
FE_TS_SYNC
FE_TS_VAL_ERR
FE_TS_CLK
FE_TS_DATA[0]
FE_TS_DATA[1]
FE_TS_DATA[2]
FE_TS_DATA[3]
+3.3V_TU
IC2801
AP2114H-2.5TRG1
FE_TS_DATA[4]
FE_TS_DATA[5]
VIN
FE_TS_DATA[6]
GND
FE_TS_DATA[7]
C2820
OPT 0.1uF
16V
BOOSTER_OPT
R2828
10K
BOOSTER_OPT
C
R2830
10K
Q2803 B
FE_BOOSTER_CTL
LNA2_CTL
The pull-up/down of LNA2_CTL
E
BOOSTER_OPT is depended on MODLE_OPT_1.
GPIO must be added for FE_BOOSTER_CTL
OPT
C2803
0.1uF 16V
OPT
R2838
4.7K
+5V_TU
TU_SCL
OPT
TU_SDA R2833 R2834
R2847
220
1K 220
OPT
R2848 0
TU_CVBS
E
R2831 0
R2832 B Q2804
1K ISA1530AC1
C
OPT
R2827
4.7K
DEMOD_SCL
DEMOD_SDA
+3.3V_TU
AP2132MP-2.5TRG1
PG
R2836 10K
C2838 C2823
0.1uF EN
10uF 16V
VIN
R2837 VCTRL
10K
+5V_Normal
+2.5V_TU
VOUT
R2829
1
C2821
C2822
10uF 0.1uF
10V
16V
+5V_TU
200mA
C2824
22uF
10V
DVB_T2_TUNER
+5V_TU
R2839
470
OPT
OPT
R2840
82
TU_SIF
E
B
ISA1530AC1
OPT
Q2805
C
R2845
0
IF_AGC_MAIN
IF_N_MSTAR
IF_P_MSTAR
DEMOD_RESET
This was being applied to the only china demod,
so this has to be deleted in both main and ISDB sheet.
IC2802
[EP]
+1.2V_TU
GND
1 8
R1
R2842 R2844
ADJ
11K 11K
2 7
1% 1%
VOUT
3 6
NC
4 5 C2830
C2831
0.1uF
R2841 10uF
16V
20K
10V
1%
380mA
R2
Vo=0.8*(1+R1/R2)
+5V_TUNER
+3.3V_TU +3.3V_Normal
60mA
L2804 L2805
BLM18PG121SN1D BLM18PG121SN1D
OPT
C2826 C2827 C2825 C2837 C2829 C2828 C2836
C2832
0.1uF 22uF 0.1uF 0.1uF 22uF 0.1uF 22uF
0.1uF
16V 16V 16V 16V 10V
16V
GP2R 20101023
28
LGE Internal Use Only