LG DT-65780M Diagram
3-18 3-19
DIAGRAMAS DE BLOQUES
1. DIAGRAMA DE BLOQUES DE LA FUENTE DE PODER (SMPS), DIAGRAMA 1
BD101
BD101
PW101
BR
(BK)BL(WH)
V101
F101
!
!
IC105
F102
IC106
!
IC102
T102
IC103
!
!
T101
!
C103
5.0V REG
BLOCK
( IC152, C172 )
C113C114
C122
!!
!
!
PSW01
32VA
5VA
12VA
PWR SENSE
PSV01
FD(+)
FD(-)
-29VA
33VA
13VA
3.8VA
5.3VA
LINE FILTER
BLOCK
( C101, C102,
L101, L102 )
RECTIFIER & SMOOTHING
BLOCK
( D129, C144, L124, C147 )
FEED-BACK
BLOCK
( R132, R133, C148,
R134, R135, R136,
R137 )
RECTIFIER &
SMOOTHING
BLOCK
(D123, C130, ZD121, R127)
RECTIFIER & SMOOTHING
BLOCK
( D126, C140, L122, C141 )
RECTIFIER &
SMOOTHING
BLOCK
( D125, R129, C138 )
FEED-BACK
BLOCK
( R122, R121, C136,
R123, R124, R125,
R126 )
12V REG
BLOCK
( IC153, C139 )
PWR SENSE
BLOCK
( R184, R185 )
RECTIFIER & SMOOTHING
BLOCK
( D124, C137, R128 )
DRIVE & S/W BLOCK
QUASI-RESONANT BLOCK
( IC101, R114, R115, C123, C107,
BC101, D108, R101, D102, R102,
D103, R106, ZD102, Z101, C108,
R104, C109, C110)
RECTIFER & SMOOTHING
BLOCK
( D122, C131, R131,
C132, C133, C135, L122 )
SNUBBER
BLOCK
( R110, C115,
D104, C117 )
DRIVE & S/W BLOCK
SOFT-START BLOCK
( R107, R108, C121, R105,
C120, C119, ZD1103, D105,
R111, BC102 )
RECTIFIER & SMOOTHING
BLOCK
( D127, C142, L123, C146 )
DT-65780M's
3-20 3-21
2. DIAGRAMA DE BLOQUES DE LA FUENTE DE PODER (SMPS), DIAGRAMA 2
FD(+)
FD(-)
-29VA
GND
33VA
GND
13VA
GND
3.8VA
3.8VA
GND
5.3VA
5.3VA
GND
GND
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
TO SYS
FD(+)
TO SYS
FD(-)
TO SYS
-29VA
TO TU
33VT
TO TU
REG 12VT
TO SYS
5.3VA
TO TU/SYS/ Hi-Fi
5.2VA
TO AVCP
REG 5V
FROM µ-COM
PWR CTL 'H'
PVS01
5.3VA
8V
GND
REG 12VT
3.3V
3.3V
5V
5V
GND
2.5V
GND
GND
1
2
3
4
5
6
7
8
9
10
11
12
PVD01
33VT BLOCK
(Q163, R168,
R169, R170)
12VT BLOCK
(IC164, C162, R171)
8V BLOCK
(IC160, D163,
C163, R161)
3.3V BLOCK
(IC161, D164, C173)
2.5V BLOCK
(IC162, D165, C172)
REG 5V
(Q166, C166, C167,
R174, ZD161)
5.2V BLOCK
(Q167, C168, R175,
R176, R177)
PWR CTL BLOCK
(Q169, C170, R181,
R182, R183)
5V BLOCK
(Q168, R178, R179,
R180, C169)
DT-65780M's
3-22 3-23
3. DIAGRAMA DE BLOQUES DEL SINTONIZADOR Y DE LOS RECEPTÁCULOS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
A.IN
TU701
GND
A.IN
MOD CTL
5.0V
VCR'H'
V.IN
GND
7
6
5
4
3
2
1
PVT01 PVT01
7
6
5
4
3
2
1
CH S/W
REG 5V
CONTROL
V.IN
RF AGC
NC
ENABLE
CLOCK
DATA
AFT
A.OUT
SIF
TU 30V
NC
V.OUT
GND
NC
CLOCK
DATA
AFT
GND
SIF
TU 33V
V.OUT
GND
PVT02 PVT02
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
C731
10µ/16V
C878
56p
R703
3.9K
C701
4.7µ/50V
C701
15PF
C704
0.1µ
C707
15PF
R708
680
R707
680
C702
220µ/6.3V
C871
4.7µ/50V
C711
R710
C712
1500p
C708
0.1µ
C703
10.1µF
R708
33K
R706
10µM
R711
1.0K
R702
1.0K
57
158
732
IC801
TU 33V
TU VIDEO
71
72
100
CLOCK
671MOD VIDEO
26VCR'H'
1065.0V
81MOD CTL
2IC801
DATA
AFT
DT-65780M's
3-24 3-25
4. DIAGRAMA DE BLOQUES DEL CIRCUITO Y/C
EP PB 'A'
EP PB 'B'
SP PB 'B'
SP PB 'A'
64
59 58 57 55 54 53
65
67
72
74
ACC
DET
ENV
DET
C-ROT
RF-SW
IN
Y/C ENA
Y/C DATA
Y/C CLOCK
V.OUT
AUDIO
MUTE
HA SW
P
P
P
C-LPF
MAIN
CONV
3.58M
BPF2
ACC
AMP
ACC
DET
CLAMP
Y
LPF
CLAMP
CLAMP
IN
OUT
VCA
CCD
3.58M
BPF1
Y/C
MIX
6dB
DOUBLE
LIMFMDEM
SUB
LPF
MAIN
DE-EM
PB
FM-EQ
FM
AGC
CNC
YNR
COMB
4.21M
BPF
SUB
CONV
39
37
36
34
26
22
21
P
B
(Modo de Reproducción)
EP REC
SP REC
57
V. H/SW55Y/C ENA
54
Y/C DATA
53 51 50 49 48 47
39
38
37
36
34
32
30
28
22
21
20
73
70
69
66
Y/C CLOCK
X-TAL
3.58MHZ
C-LPF
MAIN
CONV
4.21M
BPF
SUB
CONV
DETAIL
ENH
MAIN
EMPHA
REC
FM-EQ
4.7K
FM
MOD
Y
LPF
YNR
COMB
3.58M
BPF1
LINE2
26
V.OUT
DVD
TU/LINE1
VIDEO
AGC
CLAMP
CLAMP
CLAMP
IN
CCD
OUT
VCA
SW
BLOCK
IC302
NL
EMPHA
B-UP
AMP
ACC
AMP
ACC
DET
BGA
REC
APC
REC
AFC
320FH
VCO
SLDVX01
SERIAL
DECODER
R
R
B
DT-65780M's
(Modo de Grabación)
3-26 3-27
5. DIAGRAMA DE BLOQUES DEL AUDIO NORMAL
IC301
LA71206M
SIF
A_IN
RF_MOD
IC801
LA72670M
TUNER
TU701
10
76
DET
NORMAL
AUDIO
OUT
LINE AUDIO(R) IN
LINE AUDIO(L) IN
REAR JACK
REAR Jack
A. OUT (L)
ALC
SIF
DE MOD
INPUT
SELECT
OUTPUT
SELECT
4
6
13
1
57
9
2
71
117312
74
80
78
A. OUT (R)
DVD AUDIO
(System)
IC801
LA72670M
IC301
LA71206M
AMP
EQ
AMP
78
410
A. OUT (R)
MOD. OUT
DATA
CLOCK
R/P HEAD
N.A.IN
53
ENA
55 54
5
4
6
From u-COM
80
A. OUT (L)
2
OUTPUT
SELECTOR
EQ
3
2
SIF
DE MOD
INPUT
SELECT
OUTPUT
SELECT
IC301
LA71206M
SIF
IC801
LA72670M
TUNER
TU701
10
76
DET
NORMAL
AUDIO
OUT
LINE AUDIO(R) IN
LINE AUDIO(L) IN
REAR Jack
A. OUT (L)
REC
AMP
4
6
13 57
RF MOD.
A_IN
1 2
9
71
80
78
A. OUT (R)
DT-65780M's
ALC
9
1) Modo EE 2) Modo de Reproducción 3) Modo de Grabación
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