LG 42PT250B-SG (CHASSIS:PB12K) Service Manual ▷ View online
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.
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.
TU2101
TDTR-T036F
TDTR-T036F
14
+B3[3.3V]
13
+B2[1.2V]
5
NC_2
12
GND
11
VIDEO
2
BST_CTL
10
NC_4
4
NC_1[RF_AGC]
1
RF_S/W_CTL
17
DIF_1[N]
9
SIF
8
NC_3
3
+B1[5V]
16
IF/AGC
7
SDAT
6
SCLT
15
RESET
18
DIF_2[P]
19
SHIELD
RF_SWITCH_CTL
Q2102
MMBT3906(NXP)
E
B
C
C2151
0.1uF
16V
0.1uF
16V
R2137
2.2K
FE_BOOSTER_CTL
C2138
1uF
C2125
0.1uF
C2001
1200pF
50V
1200pF
50V
+3.3V_TU
FE_TS_CLK
C2104
0.1uF
R2140
22
C2000
100uF
16V
16V
C2122
0.1uF
C2120
0.1uF
C2114
0.1uF
16V
C2131
47pF
50V
47pF
50V
C2202
0.01uF
25V
0.01uF
25V
C2139
1uF
C2142
0.01uF
+3.3V_TU
R2129
100
+3.3V_TU
R2126
200
200
+3.3V_DE
+5V_TU
R2132 2.2K
TUNER_IF_P
R2118
100
100
R2115
3K
R2124
200
200
C2147
0.1uF
C2106
1200pF
50V
R2133 2.2K
C2201
0.1uF
16V
FE_TS_VAL_ERR
X2101
25MHz
25MHz
C2117
0.1uF
16V
16V
TU_SIF
C2148
0.1uF
Q2201
MMBT3906(NXP)
E
B
C
C2111
4.7uF
10V
4.7uF
10V
C2137
30pF
50V
30pF
50V
Q2101
MMBT3906(NXP)
E
B
C
TUNER_RESET
AMP_DEMOD_SCL
R2114
3K
+5V_TU
TU_CVBS
C2136
0.1uF
16V
TUNER_IF_N
R2122
470
C2123
0.1uF
R2142
22
TUNER_IF_N
TU_SCL
C2121 0.1uF
C2150
0.1uF
R2135
10K
R2148
100
R2117
1K
1K
L700
C2129
0.1uF
0.1uF
Q2202
2SC3875S(ALY)
E
B
C
R2144
2.7K
C2144
0.1uF
R2145
22
C2108
4.7uF
10V
4.7uF
10V
R2202
10K
C2103
4.7uF
10V
4.7uF
10V
C2132
0.1uF
0.1uF
16V
R2119
100K
+1.2V_DE
C2101
0.1uF
16V
0.1uF
16V
R2147
100
AMP_DEMOD_SDA
+3.3V_DE
C2126
0.1uF
R2146
22
C2110
0.1uF
C2124
0.1uF
FE_TS_SYN
C2140
0.1uF
0.1uF
16V
R2123
82
82
C2133
0.1uF
16V
C2135
0.1uF
TU_SDA
R2120
4.7K
4.7K
R2130
100
C2146
0.1uF
0.1uF
16V
IC2102
MN884433
1
VSS_1
2
AVDD_S
3
AII_S
4
AIQ_S
5
AVSS_S
6
VRT_S
7
VRB_S
8
TCPO_S
9
VDDL_1
10
MSCL_S
11
MSDA_S
12
VSS_2
13
VSSH
14
PSEL
15
ZSEL
16
VDDL_2
17
ACKI
18
TCPO_T
19
IR_T
20
VRT_T
21
VRB_T
22
AVDD_T
23
AIN_T
24
AIP_T
25
AVSS_T
26
VSS_3
27
MSCL_T
28
MSDA_T
29
VDDH_1
30
GPO1
31
AGCI_T
32
AGCR_T
33
GPO0
34
VDDL_3
35
VSS_4
36
XO
37
XI
38
VDDH_2
39
GPI1
40
GPI0
41
TEST4
42
SHVPP
43
SHVDDH
44
NC_1
45
VSS_5
46
VDDL_4
47
TCK
48
TDI
49
NRST
50
TEST3
51
VSS_6
52
VDDL_5
53
TRST
54
TMS
55
CSEL0
56
CSEL1
57
TDO
58
SYNCA
59
ERRA
60
SYNCB
61
ERRB
62
VSS_7
63
VDDL_6
64
SADR_T
65
NC_2
66
SADR_S
67
HDVDDL0
68
VSS_8
69
SDA
70
SCL
71
VDDH_3
72
SADR
73
INTA
74
INTB
75
VSS_9
76
TEST1
77
TEST2
78
SCKA
79
GPI2
80
SDOA
81
PCKA
82
DENA
83
VDDH_4
84
VSS_10
85
HDVPP
86
RON
87
NC_3
88
HDVDDH
89
NC_4
90
HDVDDL1
91
VSS_11
92
VDDL_7
93
SCKB
94
TEST0
95
SDOB
96
PCKB
97
DENB
98
GPO2
99
VDDH_5
100
AGC_S
+1.2V_DE
R2143
22
C2113
0.1uF
C2141
30pF
50V
30pF
50V
C2130
47pF
50V
47pF
50V
FE_TS_SERIAL
+5V_TU
R2139
1M
1M
C2002
1200pF
50V
1200pF
50V
C2116
0.1uF
16V
TUNER_IF_P
R2203
10K
R2201
2.2K
2.2K
R2121
0
READY
+5V_TU
R2141
22
ISDB_IF_AGC
R2138
2.2K
C2145
0.1uF
0.1uF
16V
C2115
100pF
50V
C2143
0.1uF
16V
DEMOD_RESET
ISDB_IF_AGC
C2149
0.1uF
R2131
10K
10K
1%
AUDIO AMP
GP4 LM1
20110531
7
7
Close to the tuner
Close to R622,R623
BRAZIL DEMODULATOR
Close to the tuner
BRAZIL TUNER
CH_6
Close to the tuner
LM1 Replace Training Manual
LM1 Replace Training Manual
Contents
- Block Diagram
- System Design
- Trouble Shooting Guide
Block Diagram – Overview()
S7LR
IR
RS-232C
UART
UART
X-tal
(24MHz)
NAND
Flash
Serial Flash
DDR3
COMP1
COMP2
Y/Cb/Cr
Y/Cb/Cr
R/G/B
RGB-PC
Rear AV
CVBS
Side AV
CVBS
AV1,2 L/R
COMP 1,2 L/R
L/R
L/R
HDMI 1
HDMI 2
HDMI 3
HDMI 2
HDMI 3
TMDS/DDC
TMDS/DDC
Video
Front
End
Audio
Front
End
HDMI
RX
LVDS out
HD
(1024*768)
HD/SD
Video
Encoder
STA368
(Digital AMP)
I2S
MCLK
Audio
DSP
SPDIF Out
UART
RX/TX
DDC
Side USB
USB2.0
TMDS/DDC
RGB-PC L/R
CVBS
DEMOD
DEMOD
CVBS(ATV)
Serial_TS(SBTVD)
IF
SIF
Cab
le
ISDB-T/
PAL/NTSC
IF(ATSC)
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