Sharp LC-20B2E (serv.man9) Service Manual ▷ View online
25
LC-20B2E
24
12
11
10
9
8
7
6
5
4
3
2
1
A
B
C
D
E
F
G
H
O
VERALL WIRING
DIA
GRAM
MONOS
GND
SIF
B31V
GND
SCL1
SDA1
GND
V2 L
V2 R
GND
V2LO
V2RO
GND
SC2OUTL
SC2OUTR
GND
V2VO
GND
V2VO
GND
TV_V
GND
SCY
B12V1A
GND
OFL
LMUTE
HSYNC_SW
GND
GND
SIF
B31V
GND
SCL1
SDA1
GND
V2 L
V2 R
GND
V2LO
V2RO
GND
SC2OUTL
SC2OUTR
GND
V2VO
GND
V2VO
GND
TV_V
GND
SCY
B12V1A
GND
OFL
LMUTE
HSYNC_SW
GND
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
MA
PAVCC
PAVCC
N. C
PAGND
PAGND
SIGGND
SIGGND
N. C
SIGVCC
SIGVCC
PAVCC
N. C
PAGND
PAGND
SIGGND
SIGGND
N. C
SIGVCC
SIGVCC
1
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
9
10
MB
OPTION
IREM
MRDY
B5VA
SUB_CLK
SUB_IN
SUB_OUT
MIS_IN
MIS_OUT
OSDCK
OSDVD
OSDHD
B5V500MA
TEXTBLK
TEXTB
TEXTG
TEXTR
GND
GND
VIDEO
IREM
MRDY
B5VA
SUB_CLK
SUB_IN
SUB_OUT
MIS_IN
MIS_OUT
OSDCK
OSDVD
OSDHD
B5V500MA
TEXTBLK
TEXTB
TEXTG
TEXTR
GND
GND
VIDEO
20
19
18
17
16
15
14
13
12
11
10
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
MT
MONOS
GND
SIF
B31V
GND
SCL1
SDA1
GND
V2 L
V2 R
GND
V2LO
V2RO
GND
SC2OUTL
SC2OUTR
GND
V2VO
GND
V2VO
GND
TV_V
GND
SCY
B12V1A
GND
OFL
LMUTE
HSYNC_SW
GND
GND
SIF
B31V
GND
SCL1
SDA1
GND
V2 L
V2 R
GND
V2LO
V2RO
GND
SC2OUTL
SC2OUTR
GND
V2VO
GND
V2VO
GND
TV_V
GND
SCY
B12V1A
GND
OFL
LMUTE
HSYNC_SW
GND
1
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
MA
GND
SCL0
SDA0
SCL1
SDA1
RSIG
JST
SCL0
SDA0
SCL1
SDA1
RSIG
JST
1
2
3
4
5
6
7
2
3
4
5
6
7
TA
PAVCC
PAVCC
N. .C
PAGND
PAGND
SIGGND
SIGGND
N. C
SIGVCC
SIGVCC
PAVCC
N. .C
PAGND
PAGND
SIGGND
SIGGND
N. C
SIGVCC
SIGVCC
1
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
9
10
MB
V1IN
VGND
V1_L
V1_R
SGND
V1_SY
V1_SC
1
2
3
4
5
6
7
MV
LIGHT COLD
LIGHT COLD
LIGHT COLD
LIGHT COLD
LIGHT COLD
1
2
3
2
3
IB
LIGHT COLD
LIGHT COLD
LIGHT COLD
LIGHT COLD
LIGHT COLD
1
2
3
2
3
IC
L SP
PA GND
1
2
R SP
PA GND
1
2
IREM
B5VA
POW
GND
L_ERR
RC_IND
1
2
3
4
5
6
MR
IREM
B5VA
POW
GND
L_ERR
RC_IND
1
2
3
4
5
6
MR
MT
IR_EM_OUT
IR_EM
MRDY
B5VA
SUB_CLK
SUB_IN
SUB_OUT
MIS_IN
MIS_OUT
NC
V
H
B5V500MA
FB_VPC
B_VPC
G_VPC
R_VPC
GND
GND
VIDEO-VPC
IR_EM
MRDY
B5VA
SUB_CLK
SUB_IN
SUB_OUT
MIS_IN
MIS_OUT
NC
V
H
B5V500MA
FB_VPC
B_VPC
G_VPC
R_VPC
GND
GND
VIDEO-VPC
1
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
11
12
13
14
15
16
17
18
19
20
VCOM
VCOM
DGND
CSCOM
CSCOM
SGND
V0
V16
V32
V48
V63
DGND
3.3V VSH
3.3V VSH
5V VLS
5V VLS
DGND
R5
R4
R3
R2
R1
R0
DGND
G5
G4
G3
G2
G1
G0
DGND
B5
B4
B3
B2
B1
B0
DGND
CK
DGND
SPIO
SPOI
LBR
HG
DGND
YOBI8
YOBI7
YOBI6
YOBI5
YOBI4
YOBI3
YOBI2
YOBI1
VCOM
DGND
CSCOM
CSCOM
SGND
V0
V16
V32
V48
V63
DGND
3.3V VSH
3.3V VSH
5V VLS
5V VLS
DGND
R5
R4
R3
R2
R1
R0
DGND
G5
G4
G3
G2
G1
G0
DGND
B5
B4
B3
B2
B1
B0
DGND
CK
DGND
SPIO
SPOI
LBR
HG
DGND
YOBI8
YOBI7
YOBI6
YOBI5
YOBI4
YOBI3
YOBI2
YOBI1
1
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
LS
VLS
VLS
DGND
DGND
DGND
DGND
DGND
VGL
VGL
VGL
VSH
VSH
VGH
VGH
U/D
GSP
POWER
GCK
CSCOM
CSCOM
YOBI1
YOBI2
YOBI3
YOBI4
YOBI5
YOBI6
YOBI7
YOBI8
DGND
DGND
VLS
DGND
DGND
DGND
DGND
DGND
VGL
VGL
VGL
VSH
VSH
VGH
VGH
U/D
GSP
POWER
GCK
CSCOM
CSCOM
YOBI1
YOBI2
YOBI3
YOBI4
YOBI5
YOBI6
YOBI7
YOBI8
DGND
DGND
1
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
LG
INV Vcc
OFL
INV GND
OFL
INV GND
1
2
3
2
3
VE
INVGND
INVGND
INVGND
1
2
2
VD
T
E
E
R
M
I
N
A
A
L
U
N
N
I
T
R
U
N
U
N
T
K
0
7
0
4
K
0
7
0
4
C
E
E
Z
Z
Z
V1IN
VGND
V1_L
V1_R
SGND
V1_SY
V1_SC
1
2
3
4
5
6
7
MV
JACK UNIT
DUNTKA699DE
R/C RECEIVER UNIT
OPERATION UNIT
DUNTKA696DE
MAIN UNIT
INVGND
INVGND
INVGND
1
2
2
VD
H_L
GND
H_R
NC
GND
H_R
NC
1
2
3
4
2
3
4
MH
H_L
GND
H_R
NC
GND
H_R
NC
1
2
3
4
2
3
4
MH
INV Vcc
OFL
INV GND
OFL
INV GND
1
2
3
2
3
VF
B
A
C
K
A
C
K
L
I
G
H
T
I
G
H
T
DUNTKA700DE
LIGHT HOT
LIGHT HOT
LIGHT HOT
LIGHT HOT
LIGHT HOT
1
2
3
2
3
HV
INV Vcc
OFL
INV GND
OFL
INV GND
1
2
3
2
3
VE
INVERTER-A UNIT
DUNTKA400DE
LIGHT HOT
LIGHT HOT
LIGHT HOT
LIGHT HOT
LIGHT HOT
1
2
3
2
3
HV
INV Vcc
OFL
INV GND
OFL
INV GND
1
2
3
2
3
VF
INVERTER-B UNIT
DUNTKA430DE
L
C
D
D
S
O
U
R
C
U
R
C
E
L
C
D
D
G
A
T
E
T
E
LMRDY
SCL1
SDA1
GND
MRDY
1
2
3
4
5
MC
POW2
POW1
KEY1
KEY2
GND
1
2
3
4
5
MS
POW2
POW1
KEY1
KEY2
GND
POW1
KEY1
KEY2
GND
1
2
3
4
5
2
3
4
5
MS
DUNTKA6980DE
26
LC-20B2E
VOLTAGE MEASUREMENT CONDITION:
1. Voltages at test points are measured at the
supply voltage of AC 120V. Signals are fed by a
color bar signal generator for servicing purpose and
the above voltages are measured with a 20k ohm/
V tester.
color bar signal generator for servicing purpose and
the above voltages are measured with a 20k ohm/
V tester.
WAVEFORM MEASUREMENT CONDI-
TION:
TION:
1. Waveforms at test points are observed at the supply
voltage of AC 120V. Signals are fed by a color bar
signal generator for servicing purpose.
signal generator for servicing purpose.
INDICATION OF RESISTOR & CAPACI-
TOR:
TOR:
RESISTOR
1. The unit of resistance “
1. The unit of resistance “
Ω
” is omitted.
(K=k
Ω
=1000
Ω
, M=M
Ω
).
2. All resistors are ± 5%, unless otherwise noted.
(J= ± 5%, F= ± 1%, D= ± 0.5%)
3. All resistors are 1/10W, unless otherwise noted.
4. All resistors are Carbon type, unless otherwise
4. All resistors are Carbon type, unless otherwise
noted.
C
: Solid
W
: Cement
S
: Oxide Film
T
: Special
N
: Metal Coating
CAPACITOR
1. All capacitors are
1. All capacitors are
µ
F, unless otherwise noted.
(P=pF=
µµ
F).
2. All capacitors are 50V, unless otherwise noted.
3. All capacitors are Ceramic type, unless otherwise
3. All capacitors are Ceramic type, unless otherwise
noted.
(ML): Mylar
(TA): Tantalum
(PF): Polypro Film
(ST): Styrol
CAUTION:
This circuit diagram is original one, therefore there may be a
slight difference from yours.
slight difference from yours.
SAFETY NOTES:
1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACEING PARTS.
2. SEMICONDUCTOR HEAT SINKS SHOULD BE
REGARDED AS POTENTIAL SHOCK HAZARDS
WHEN THE CHASSIS IS OPERATING.
WHEN THE CHASSIS IS OPERATING.
IMPORTANT SAFETY NOTICE:
PARTS MARKED WITH “
å
” (
) A R E
IMPORTANT FOR MAINTAINING THE SAFETY OF
THE SET. BE SURE TO REPLACE THESE PARTS
WITH SPECIFIED ONES FOR MAINTAINING THE
SAFETY AND PERFORMANCE OF THE SET.
THE SET. BE SURE TO REPLACE THESE PARTS
WITH SPECIFIED ONES FOR MAINTAINING THE
SAFETY AND PERFORMANCE OF THE SET.
DESCRIPTION OF SCHEMATIC DIAGRAM
27
6
5
4
3
2
1
A
B
C
D
E
F
G
H
LC-20B2E
SCHEMATIC DIAGRAM
Ë
OPERATION and R/C RECEIVER Unit
R/C RECEIVER
OPERATION
29
LC-20B2E
28
12
11
10
9
8
7
6
5
4
3
2
1
A
B
C
D
E
F
G
H
Ë
MAIN Unit-1/7
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