Read LG 42LF7300 Service Manual online
1
1
2
2
3
3
4
4
5
5
A
A
B
B
C
C
D
D
+5V
+1V2DT
+3V3DT
+12V
+8V
+1V8Q
+5VTA
Title
Size
Document Number
Rev
Date:
Sheet
of
LF7300-MAIN-27
10
CH[POWER REGULATOR]
LGE HD T+C
LF7300
27
43
Wednesday, April 15, 2009
Title
Size
Document Number
Rev
Date:
Sheet
of
LF7300-MAIN-27
10
CH[POWER REGULATOR]
LGE HD T+C
LF7300
27
43
Wednesday, April 15, 2009
Title
Size
Document Number
Rev
Date:
Sheet
of
LF7300-MAIN-27
10
CH[POWER REGULATOR]
LGE HD T+C
LF7300
27
43
Wednesday, April 15, 2009
C400
101p/50V/1005
C400
101p/50V/1005
TP182
PCB_TP10
PCB_TP10
TP182
PCB_TP10
PCB_TP10
1
C407
104p/16V/1005
C407
104p/16V/1005
C395
106p/16V/2012
C395
106p/16V/2012
R452
3092/F/1005
3092/F/1005
R452
3092/F/1005
3092/F/1005
TP181
PCB_TP10
PCB_TP10
TP181
PCB_TP10
PCB_TP10
1
TP178
PCB_TP10
PCB_TP10
TP178
PCB_TP10
PCB_TP10
1
R454
103/F/1005
103/F/1005
R454
103/F/1005
103/F/1005
TP179
PCB_TP10
PCB_TP10
TP179
PCB_TP10
PCB_TP10
1
C396
104p/16V/1005
C396
104p/16V/1005
C409
104p/16V/1005
C409
104p/16V/1005
R455
103/F/1005
103/F/1005
R455
103/F/1005
103/F/1005
U48
LD1117AL-1.2/SOT-223
U48
LD1117AL-1.2/SOT-223
ADJ
1
TAP
4
VIN
3
VO
2
C408
106p/10V/2012
C408
106p/10V/2012
C404
104p/16V/1005
C404
104p/16V/1005
U46
LD29150PT/P-PAK 5P
LD29150PT/P-PAK 5P
U46
LD29150PT/P-PAK 5P
LD29150PT/P-PAK 5P
/INH
1
VIN
2
GND
3
VOUT
4
ADJ
5
GND
6
TP180
PCB_TP10
PCB_TP10
TP180
PCB_TP10
PCB_TP10
1
R457
201/F/1005
201/F/1005
R457
201/F/1005
201/F/1005
C397
106p/10V/2012
C397
106p/10V/2012
C505
100uF/16V/MVK/S
C505
100uF/16V/MVK/S
C406
106p/10V/2012
C406
106p/10V/2012
R459
560/F/1005
560/F/1005
R459
560/F/1005
560/F/1005
U49
LD1117AL-ADJ
LD1117AL-ADJ
U49
LD1117AL-ADJ
LD1117AL-ADJ
VIN
3
ADJ
1
VO
2
TAP
4
C394
101p/50V/1005
C394
101p/50V/1005
TP176
PCB_TP10
PCB_TP10
TP176
PCB_TP10
PCB_TP10
1
C403
106p/10V/2012
C403
106p/10V/2012
U45
LD29150PT/P-PAK 5P
LD29150PT/P-PAK 5P
U45
LD29150PT/P-PAK 5P
LD29150PT/P-PAK 5P
/INH
1
VIN
2
GND
3
VOUT
4
ADJ
5
GND
6
C405
104p/16V/1005
C405
104p/16V/1005
U47
LD1117AL-ADJ
LD1117AL-ADJ
U47
LD1117AL-ADJ
LD1117AL-ADJ
ADJ
1
TAP
4
VIN
3
VO
2
C399
105p/16V/1005
C399
105p/16V/1005
R453
563/F/1005
563/F/1005
R453
563/F/1005
563/F/1005
R456
121/F/1005
121/F/1005
R456
121/F/1005
121/F/1005
C402
104p/16V/1005
C402
104p/16V/1005
C398
104p/16V/1005
C398
104p/16V/1005
C401
106p/10V/2012
C401
106p/10V/2012
TP177
PCB_TP10
PCB_TP10
TP177
PCB_TP10
PCB_TP10
1
R458
121/F/1005
121/F/1005
R458
121/F/1005
121/F/1005
1
1
2
2
3
3
4
4
5
5
6
6
A
A
B
B
C
C
D
D
+5VTA
+5VTA
+5VTA
+3V3DT
+5VTA
+5VT_ANT
+3V3DT
+5VT_ANT
RF_CVBS
9
SIF
9
TUNER0_SCL
29,30
TUNER0_AGC 29,30
TUNER0_SDA
29,30
QAM_IF_NARROW-
30
QAM_IF_NARROW+
30
DTT_IF_NARROW-
29
DTT_IF_NARROW+
29
ANT_PWR_EN
5
ANT_PWR_CHK
5
Title
Size
Document Number
Rev
Date:
Sheet
of
LF7300-MAIN-10
10
CH[HYBRID TUNER]
LGE HD T+C
LF7300
28
43
Wednesday, April 15, 2009
Title
Size
Document Number
Rev
Date:
Sheet
of
LF7300-MAIN-10
10
CH[HYBRID TUNER]
LGE HD T+C
LF7300
28
43
Wednesday, April 15, 2009
Title
Size
Document Number
Rev
Date:
Sheet
of
LF7300-MAIN-10
10
CH[HYBRID TUNER]
LGE HD T+C
LF7300
28
43
Wednesday, April 15, 2009
Antenna Current Limiting Circuit (100mA Limiting)
Antenna Power Short Protection Circuit
ANT_PWR_EN
LOW
HIGH
ON
+5V_ANT
OFF
Q39
FDV301N_NL
FDV301N_NL
Q39
FDV301N_NL
FDV301N_NL
1
3
2
R468
101/1005
R468
101/1005
L84
BLM18PG300SN1D
BLM18PG300SN1D
L84
BLM18PG300SN1D
BLM18PG300SN1D
RF IN
U50
FQD1116AME/BH
FQD1116AME/BH
RF IN
U50
FQD1116AME/BH
FQD1116AME/BH
RF PIN IN/OUT(OPTION)
1
ANT_PWR
2
GND
3
NC
4
RF_
AGC
5
GND
6
VP_TUN_+5v
7
VT
8
GND
9
NC
10
AS
11
SCL
12
SDA
13
REF
14
IF-AGC
15
DIF1
16
DIF2
17
WIF O
U
T/NC
18
+5V IF
19
2nd IF SOUND/LOW DIG IF1
20
2nd IF SOUND/LOW DIG IF2
21
NC
22
AS_IF
23
CVBS
24
GND
25
GND
26
GND
27
GND
28
R923
101/1005
R923
101/1005
C419
OPEN-330p/50V/1005
OPEN-330p/50V/1005
C419
OPEN-330p/50V/1005
OPEN-330p/50V/1005
U922
POWER SW MIC2544-1YMM
U922
POWER SW MIC2544-1YMM
EN
1
FLG
2
NC
4
ILIM
5
OUT
6
IN
7
OUT
8
GND
3
R465
201/1005
R465
201/1005
R464
121/F/1005
121/F/1005
R464
121/F/1005
121/F/1005
R461
750/F/1005
R461
750/F/1005
C936
220p/50V/1005
C936
220p/50V/1005
R469
562/1005
R469
562/1005
R466
330/F/1005
330/F/1005
R466
330/F/1005
330/F/1005
C418
OPEN-330p/50V/1005
C418
OPEN-330p/50V/1005
R467
562/1005
R467
562/1005
C504
102p/50V/1005
C504
102p/50V/1005
Q38
FDV301N_NL
FDV301N_NL
Q38
FDV301N_NL
FDV301N_NL
1
3
2
R471
000/1005
R471
000/1005
C412
4R7p/50V/1005
4R7p/50V/1005
C412
4R7p/50V/1005
4R7p/50V/1005
R462
121/F/1005
121/F/1005
R462
121/F/1005
121/F/1005
C443
220uF/16V/MVK/S
C443
220uF/16V/MVK/S
C415
102p/50V/1005
C415
102p/50V/1005
C411
104p/16V/1005
C411
104p/16V/1005
C417
104p/16V/1005
C417
104p/16V/1005
R922
330/1005
R922
330/1005
L69
BLM18PG300SN1D
BLM18PG300SN1D
L69
BLM18PG300SN1D
BLM18PG300SN1D
R470
000/1005
R470
000/1005
C414
104p/16V/1005
C414
104p/16V/1005
R924
103/1005
103/1005
R924
103/1005
103/1005
C410
220uF/16V/MVK/S
C410
220uF/16V/MVK/S
R927
222/1005
R927
222/1005
R460
000/1005
R460
000/1005
R463
201/1005
R463
201/1005
C416
220uF/16V/MVK/S
C416
220uF/16V/MVK/S
C413
102p/50V/1005
C413
102p/50V/1005
C491
104p/16V/1005
C491
104p/16V/1005
L68
BLM18PG300SN1D
BLM18PG300SN1D
L68
BLM18PG300SN1D
BLM18PG300SN1D
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