LG 42PT250B Service Manual page 21

BRAZIL TUNER
TU2101
TDTR-T036F
RF_S/W_CTL
1
BST_CTL
2
+B1[5V]
3
Close to the tuner
NC_1[RF_AGC]
4
C2001
C2002
1200pF 1200pF
NC_2
50V
50V
5
SCLT
6
SDAT
7
NC_3
8
SIF
9
NC_4
10
VIDEO
+1.2V_DE
11
GND
12
C2103
+B2[1.2V]
4.7uF
13
10V
+B3[3.3V]
14
RESET
15
IF/AGC
16
DIF_1[N]
17
C2101
0.1uF
DIF_2[P]
16V
18
Close to the tuner
19
SHIELD
TUNER_IF_N
TUNER_IF_P
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
RF_SWITCH_CTL
C2201
0.1uF
16V
+5V_TU
R2202
E 10K
R2201
Q2201
2.2K
MMBT3906(NXP)
B
C
R2203
C
10K
C2202
0.01uF Q2202 B
FE_BOOSTER_CTL
2SC3875S(ALY)
25V
E
+5V_TU
Close to the tuner
L700
C2000
C2108 C2110
C2106
100uF
1200pF 4.7uF 0.1uF
16V
50V 10V
+3.3V_TU
R2114 R2115
+5V_TU
3K
3K
100 R2147
CH_6
TU_SCL R2122
470
100
R2148
R2123
TU_SDA
82
C2130 C2131
E
47pF 47pF
C2115
50V 50V
100pF 50V B MMBT3906(NXP)
R2120 Q2101
C
4.7K +5V_TU
R2124
200
+3.3V_TU
READY
C2104 R2121 0
0.1uF
C2111
+3.3V_TU
E
4.7uF C2113
10V
0.1uF
R2119 B Q2102
R2118
100K
100 MMBT3906(NXP)
TUNER_RESET C
C2114
0.1uF
R2117 16V
1K
ISDB_IF_AGC
TU_SIF
R2126
200
C2116
0.1uF
TUNER_IF_N
16V
100
R2129
R2130 100
TU_CVBS C2117
TUNER_IF_P
0.1uF
16V
Close to R622,R623
BRAZIL DEMODULATOR
+1.2V_DE
+3.3V_DE
C2132
0.1uF
16V
VSS_1
1
AVDD_S
2
AII_S
0.1uF 3
C2120
AIQ_S
4
AVSS_S
5
VRT_S
6
VRB_S
7
TCPO_S
8 IC2102
C2121 0.1uF
VDDL_1
9
R2132 2.2K
MSCL_S
10
MN884433
R2133 2.2K
MSDA_S
11
VSS_2
12
VSSH
13
0.1uF
PSEL
C2122 14
ZSEL
15
VDDL_2
16
0.1uF
ACKI
C2123 17
TCPO_T
R2131 18
1%
10K IR_T
19
VRT_T
20
C2124 0.1uF
VRB_T
21
C2125 0.1uF
AVDD_T
22
C2126 0.1uF
AIN_T
23
AIP_T
24
AVSS_T
25
R2137 2.2K
R2138 2.2K
C2133 C2136 C2140
0.1uF
0.1uF
0.1uF
16V 16V 16V
C2143
0.1uF
R2139 16V
1M
ISDB_IF_AGC
10K
R2135 X2101
25MHz
C2129
0.1uF C2137 C2141
30pF 30pF
50V 50V
R2140 22
FE_TS_VAL_ERR
R2141
22
FE_TS_SYN
R2142 22
FE_TS_SERIAL
R2143 22
FE_TS_CLK
VSS_9
75
INTB
74
INTA
73
SADR
72
VDDH_3
71
C2147 0.1uF R2145 AMP_DEMOD_SCL
SCL 22
70
SDA
69
VSS_8 22
68 R2146 AMP_DEMOD_SDA
HDVDDL0
67
C2148 0.1uF
SADR_S
66
NC_2
65
SADR_T
64
VDDL_6
63
C2149 0.1uF
VSS_7
62
ERRB
61
SYNCB
60
ERRA
59
SYNCA
58
TDO
57
CSEL1
56
CSEL0
55
TMS
54
TRST
53
VDDL_5
52
C2150 0.1uF
VSS_6
51
+3.3V_DE
DEMOD_RESET
C2151
0.1uF
C2145 C2146
16V
0.1uF 0.1uF
16V 16V
GP4 LM1 20110531
7
7
AUDIO AMP
LGE Internal Use Only