Page 1
SERVICE MANUAL
20″ COLOR LCD TELEVISION
EWL2005
Page 2
[1] Rear Cabinet
[9] Front Cabinet
S-1
S-2
S-1
S-1
S-1
S-2
S-1
Fig. D1
[8] Speaker
S-7
S-4
S-8
S-9
S-10
[6] Function CBA
[7] IR Sensor CBA
[8] Speaker
S-10
S-7
S-8
S-7
[2] Jack Holder
[5] LCD Main CBA & Liquid Crystal Panel Unit
S-3
S-3
S-3
S-7
S-7
S-6
S-6
S-6
S-6
[4] Main CBA
[3] Inverter CBA
S-6
S-5
S-5
Fig. D2
4-2 L3202DC
Page 3
TV Cable Wiring Diagram
To Liquid Crystal Panel
LCD Main
CBA Unit
Function CBA
CLN104
CN104
CN113
CN311
CN103B
CN103A
CN312
CN102B
CN105
CN111
CN112
CN101B
CLN105
Main CBA
IR Sensor CBA
CN460
Inverter CBA
CN101ACN102A
CN411
CN802CN801
CLN411
CN490 CN450
To Speaker
To Liquid Crystal Panel
To Speaker
Fig. D3
4-3 L3202DC
Page 4
BLOCK DIAGRAMS
System Control Block Diagram
POWER
D102
AL +5V
Q102
SENSOR
REMOTE
RCV102
IR SENSOR CBA
CLN105
P-ON-H44
REMOTE33
CN105
KEY SWITCH
KEY SWITCH
CLN104
KEY-IN-122
KEY-IN-211
CN104
TO LCD BACKLIGHT
BLOCK DIAGRAM
CN113 IS USED
FOR ADJUSTMENT
P-ON-H
BACKLIGHT-SW
BACKLIGHT-ADJ
FUNCTION CBA
CLN411
BACKLIGHT-ADJ
BACKLIGHT-SW
P-ON-H11 11
99
88
CN411
TO POWER SUPPLY
INVERTER CBA
BLOCK DIAGRAM
P-ON-H
TO IF/VIDEO
BLOCK DIAGRAM
SCL
SDA
S-SW
INPUT-0
AFT-IN
INPUT-1
FSC
P-ON-H
VOLUME
TO AUDIO
BLOCK DIAGRAM
SDA
SCL
AUDIO-MUTE
AT FACTORY
SDA2SCL1BUS-OPEN
4
CN113 (NO CONNECTION)
IC333 (TV MICRO CONTROLLER)
4
KEY-IN-2
3
KEY-IN-1
MAIN CBALCD MAIN CBA UNIT
BUS-OPEN519
BACKLIGHT-SW
BACKLIGHT-ADJ
P-ON-H16 8
INPUT-012 12
INPUT-111 13
P-ON-H2(NU)
19 5
21 3
14 1016
CN102B CN102A
TO POWER
SUPPLY
BLOCK
P-25V-ON
12
P-25V-ON
DIAGRAM
221817
23
BUS-OPEN
BACKLIGHT-SW
BACKLIGHT-ADJ
P-ON-H
P-ON-H2
3140193241
INPUT-0
INPUT-1
P-ON+3.3V(D)
X161
27MHz
RESET
Q151
11
REMOTE
21
RESET
42
XIN
43
XOUT
S-SW717
SCL618
SDA519
AFT-IN10 145AFT-IN
SCL
SDA
S-SW
VOLUME15 9
AUDIO-MUTE
13 11
20
35
VOLUME
AUDIO-MUTE
Q301
Q131
80
TUNERCLK
IC171
(MEMORY)
BUFFER
3.3V<-->5V
CONVERTER
7
6
5
WP
SCL
SDA
FSC123
CN103B CN103A
CN112(NO CONNECTION)
SDA 2
SCL 1
BUS-OPEN 4
NO PART
MOUNTED
FOR CN112
7-1
L3202BLS
Page 5
IF/Video Block Diagram
TO
CVBS11
CN103A
LCD BLOCK
DIAGRAM
CN103B
S-VIDEO-C7
S-VIDEO-Y9
WF8
TO
VIDEO-Y5
CN103A
LCD BLOCK
DIAGRAM
CN103B
VIDEO-Pb/Cb
VIDEO-Pr/Cr
3
1
AUDIO SIGNAL
MAIN CBA
VIDEO SIGNAL
TO AUDIO BLOCK
DIAGRAM
SIF
8
SIF
AMP
7
4.5MHz
FILTER
CF31
4
SIF
TRAP
IF AGC DET
WF7
Q703
3
BUFFER
BUFFER
4
5
WF9
Q702
13
BUFFER
14
12
Q701
1
BUFFER
15
2
SW
TO AUDIO
BLOCK DIAGRAM
INPUT-0(INV)
INPUT-1(INV)
11
10
CONTROL
9
Q707
Q708
INPUT-0
INPUT-1
TO SYSTEM CONTROL
BLOCK DIAGRAM
TO SYSTEM CONTROL
BLOCK DIAGRAM
AFT-IN
13
18
IC781 (INPUT SELECT)
Q32
EQ
AMP
1
2
DEFEAT
VIDEO
VIF
IC31 (IF SIGNAL PROCESS)
16
SAW
FILTER
SF11
IF
TU1
(TUNER UNIT)
DET
AMP
17
VCO
RF
AGC
14
5
173
AGC
XTAL-IN
2
SCL
AFT
SDA
AMP
11
SDA
TO
SCL
FSC
SYSTEM
CONTROL
WF10
WF11
WF12
S-SW
BLOCK
DIAGRAM
JK703
VIDEO1
BUFFER
Q704
Q705
CY
-IN
JK701
S-VIDEO
IN
JK706
VIDEO-YINJK707
BUFFER
Q706
VIDEO-Pb/CbINJK708
BUFFER
VIDEO-Pr/Cr
IN
7- 2 L3202BLIF
Page 6
Audio Block Diagram
AUDIO SIGNAL
30
L-CH
OFFSET
CANCEL
75uS
DE-EMPH
MATRIX AGC
29
R-CH
OFFSET
CANCEL
WIDE BAND
EXPAND
WIDE BAND
RMS DET
WIDE BAND
FILTER
(L-R)/SAP
SW
SPECTRAL
EXPAND
dBX
DE-EMPH
SPECTRAL
RMS DET
SPECTRAL
FILTER
SP802
SPEAKER
L-CH
CLN802
SP-L 1
CN802
SP801
SPEAKER
R-CH
JK801
HEADPHONE
JACK
GND 2
WF6
VOLUME
/STANDBY
CONTROL
14
RF
AMP
11
AMP
MUTE
CLN801
GND 2
SP-R 1
CN801
TO IF/VIDEO
SCL
BLOCK DIAGRAM
SDA
INPUT-0(INV)
INPUT-1(INV)
TO SYSTEM
CONTROL BLOCK
VOLUME
P-ON-H
AUDIO-MUTE
Q803
5
7
2
Q802
+5V
IC851 (MTS/SAP AUDIO SIGNAL PROCESS)
L+R
FILTER
OFFSET
STEREO
FILTER
SIF/BB
SW
INPUT
VCA
SIF
DEMOD
21
SIF
L-R
FILTER
CANCEL
SAP OUT
FILTER
SAP
DEMOD
SAP
FILTER
I2C
DECORDER
27
24
IC801 (AUDIO AMP)
13
TUNER
AUDIO2
AUDIO1
IC852 (INPUT SELECT)
111512
14
(L-CH)
6
(L-CH)
(R-CH)
(R-CH)
TUNER
AUDIO1
4
2
1
3
AUDIO2
1
9 10
SW CTL
5
MAIN CBA
TO
IF/VIDEO BLOCK
DIAGRAM
7-3
AUDIO1(L)
JK704
-IN
JK705
AUDIO1(R)
-IN
JK709
AUDIO2(L)
-IN
JK710
AUDIO2(R)
-IN
L3202BLA
Page 7
LCD Block Diagram
LCD MODULE
OR(0)34
OR(2)32
OR(3)31
OR(1)33
OR(4)30
OR(5)29
OG(0)27
OG(1)26
OG(2)25
OG(3)24
OG(4)23
OG(5)22
OB(0)20
OB(1)19
OB(2)18
OB(3)17
OB(4)16
OB(5)15
ER(0)6
ER(1)5
ER(2)4
ER(3)3
ER(4)2
ER(5)1
EG(0)50
EG(1)49
EG(2)48
EG(3)47
EG(4)46
EG(5)45
EB(0)43
EB(1)42
EB(2)41
EB(3)40
EB(4)39
EB(5)38
OFFEV12
STV113
CLKV14
HMS1-E7
HMS1-013
STH142
POL43
LP44
CLKH10
VIDEO SIGNAL
LCD MAIN CBA UNIT
CN311
170
169
166
R(ODD)
R
165
164
163
162
161
157
156
G(ODD)
G
155
154
153
152
148
B(ODD)
B
147
146
145
LCD RGB
138
137
SIGNAL
PROCESS
136
135
130
129
R(EVEN)
Y
CN312
128
127
126
125
G(EVEN)
Pb/Cb
118
117
116
115
114
113
Pr/Cr B(EVEN)
108
107
101
105
STV1
OFFEV
R365
106
CLKV
CN311
WF1
WF2
R392
144
143
CLKH1
ODDINV
R202
R394
172
139
173
POL
STH-1
EVENINV
WF4
R201
WF3
WF5
174
LP
IC333 (LCD DRIVE / SIGNAL PROCESS)
A/D
R
CVBS
68
CN103B
CVBS 13
TO
IF/VIDEO
S-VIDEO-Y 15
S-VIDEO-C 17
BLOCK
DIAGRAM
CN103A
A/D
G
VIDEO
SIGNAL
C
49
PROCESS
A/D
B
Y
71
7-4
A/D
74
A/D
52
CN103B
VIDEO-Y 19
TO
IF/VIDEO
A/D
60
21
23
VIDEO-Pr/Cr
VIDEO-Pb/Cb
BLOCK
DIAGRAM
CN103A
L3202BLLCD
Page 8
Power Supply Block Diagram
NOTE:
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.
TO LCD
BACKLIGHT
BLOCK
DIAGRAM
TO SYSTEM
CONTROL
BLOCK
DIAGRAM
TO SYSTEM
CONTROL
BLOCK
DIAGRAM
+21V
TP401
For continued protection against risk of fire,
replace only with same type 4 A, 125V fuse.
CAUTION ! :
ATTENTION : Utiliser un fusible de rechange de même type de 4A, 125V.
Q505
4A/125V
AL+21V
Q510
Q512
Q509
AL+13V
IC671
REG+5V
+5V REG.
IC672
REG+5V
IC531
+5V REG.
VT+33V
AL+7V(D)
+7V REG.
P-ON-H
Q531
IC533
AL+5V
+5V REG.
Q513
PANEL+3.3V
PANEL+10.8V
PANEL+25V
PANEL-6V
CN101B
PANEL+3.3V
PANEL+10.8V
PANEL+25V73
PANEL-6V82
46
55
CN101A
Q501
Q502
Q511
P-25V-ON
CN102B
P-25V-ON21 3
CN102A
Q633
AL+5V
AL+5V22 2
LCD MAIN CBA UNIT
MAIN CBA
T601
9
7
11
16
HOT COLD
BRIDGE
RECTIFIER
D605 - D608
L602
LINE
FILTER
L601
LINE
FILTER
F601
4A/125V
CAUTION !
Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.
If Main Fuse (F601) is blown , check to see that all components in the power supply
circuit are not defective before you connect the AC plug to the AC power supply.
Otherwise it may cause some components in the power supply circuit to fail.
HOT CIRCUIT. BE CAREFUL.
4A/125V
10
12
3
SWITCHING
Q601
2
CONTROL
Q603
SWITCHING
1
4
IC601
ERROR
2
3
VOLTAGE DET
13
14
5
15
AC601
AC CORD
7-5
L3202BLP
Page 9
LCD Backlight Block Diagram
BACK
1
CN450
LIGHT
2
OVER VOLTA GE
Q451,452
PROTECTOR
BACK
1
CN490
LIGHT
2
OVER VOLTA GE
PROTECTOR
Q491,492
Q454,455
BACK
LIGHT
LCD MODULEINVERTER CBA
1
2
CN460
7 6 98 1 2
13 14
OVER VOLTA GE
PROTECTOR
IC402
(OP AMP)
OVER VOLTA GE
PROTECTOR
Q461,462
T450
9
3
10
425
RL401
CLN411
Q421,
Q426
9
T490
3
CURRENT
CONTROL
10
425
SWITCH
Q403
7
8
1
6
8
IC401 (DC-AC INVERTER CONTROL)
1
7
6
262723
OUTPUT
LOGIC1
24
OUTPUT
LOGIC2
457
OSC
T460
Q433
LOGIC
9
3
425
CURRENT
CONTROL
SWITCH
Q411
OVER
VOLTAGE
10
+8V
REG.
28
VCC
PROTECT
7
8
1
6
14
PWM2
13
11
12
PWM1
10
9
STANDBY
16
SLOW
START
MODE SW
1
AL+21V22
AL+21V11
AL+21V33
CN411
AL+21V
MAIN CBA
TO
POWER
SUPPLY
BLOCK
DIAGRAM
BACKLIGHT-SW
TO
SYSTEM
P-ON-H
BACKLIGHT-ADJ
CONTROL
BLOCK
DIAGRAM
7-6
Q412
L3202BLIV
Page 10
Main 1/4 Schematic Diagram
MAIN 1/4
Ref No. Pos ition
IC531
D-4
IC533
E-3
IC671
E-2
IC672
E-2
Q501 C-4
Q502 C-4
Q503 B-3
Q505 C-3
Q509 C-3
Q510 B-2
Q511 C-3
Q512 C-2
Q513 C-2
Q531 D-3
Q633 E-1
CN411 F-4
CN101A A-4
CN102A A-3
TP401 E-4
ICS
TRANSISTORS
TEST POINT
CONNECTORS
8-3
L3202SCM1
Page 11
Main 2/4 Schematic Diagram
MAIN 2/4
Ref No. Pos ition
IC31 I-1
IC851 H-3
IC852 J-4
Q32 J-2
CN113
G-1
ICS
TRANSISTOR
CONNECTOR
8-4
L3202SCM2
Page 12
Main 3/4 Schematic Diagram
MAIN 3/4
Ref No. Pos ition
IC781
P-3
IC801
N-2
Q701
N-3
Q702
N-3
Q703 N-3
Q704 P-1
Q705 O-1
Q706 P-1
Q707 P-2
Q708
P-2
Q802
O-1
Q803
N-1
CN801
M-4
CN802 M-3
CN103A M-2
CONNECTORS
ICS
TRANSISTORS
8-5
L3202SCM3
Page 13
Main 4/4 Schematic Diagram
MAIN 4/4
Ref No. Pos ition
IC601
U-1
Q601 S-2
Q603 T-2
TRANSISTORS
IC
CAUTION !
Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.
If Main Fuse (F601) is blown , check to see that all components in the power supply
circuit are not defective before you connect the AC plug to the AC power supply.
Otherwise it may cause some components in the power supply circuit to fail.
4A/125V
CAUTION ! :
ATTENTION : Utiliser un fusible de rechange de même type de 4A, 125V.
For continued protection against risk of fire,
replace only with same type 4 A, 125V fuse.
NOTE:
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.
8-6
L3202SCM4
Page 14
Inverter Schematic Diagram
INVERTER
Ref No. Pos ition
IC401
A-3
IC402
E-3
Q403 B-1
Q411 B-3
Q412 B-3
Q421 B-4
Q426 B-3
Q433 B-2
Q451 E-4
Q452 D-4
Q454 D-3
Q455 D-3
Q461 E-2
Q462 D-2
Q491 D-3
Q492 D-3
CLN411
A-1
CN450
F-4
CN460
F-2
CN490 F-4
ICS
TRANSISTORS
CONNECTORS
8-7
L3202SCI
Page 15
Function Schematic Diagram
8-8
L3202SCF
Page 16
IR Sensor Schematic Diagram
8-9
L3202SCIR
Page 17
LCD Main 1/2 Schematic Diagram
LCD MAIN 1/2
Ref No. Pos ition
IC333
B-3
Q301
D-1
CN104
A-3
CN105
A-2
CN111
A-2
CN211
F-4
CN311 F-4
CN102B A-4
CONNECTORS
TRANSISTOR
TRANSISTOR
8-10
L3202SCL1
Page 18
LCD Main 2/2 Schematic Diagram
LCD MAIN 2/2
Ref No. Pos ition
IC151
I-3
IC171
J-3
IC191
H-2
IC192 H-1
IC193
H-2
IC201 J-1
Q131
I-4
Q201 J -1
CN112
L-4
CN312
L-3
CN101B
L-4
CN103B G-2
TRANSISTOR
CONNECTORS
TRANSISTOR
8-11
L3202SCL2
Page 19
NU
PANEL+10.8V
GND
NU
GND
PANEL+3.3V
CN101B
9
724
6
8
215
3
4
6
NU
NU
GND
PANEL+3.3V
BACKLIGHT-ADJNUGND
GND
GND
PANEL+10.8V
BACKLIGHT-SWNUNU
CN101A
CN102A
132547689
WIRING DIAGRAM
CN103B
GND
PANEL+25V
PANEL-6V
7
8
PANEL-6V
PANEL+25V
P-ON-H
VIDEO-Pb/Cb
GND
GND
VIDEO-Y
VIDEO-Pr/Cr
153
9
GND
CN103A
VOLUME
P-ON-H2(NU)
10131211141517161918212022
153
2
GND
VIDEO-Pr/Cr
VIDEO-Pb/Cb
AUDIO-MUTE
INPUT-0
INPUT-1
4
GND
AFT-IN
1923212022
VIDEO-Y
PROTECT-1
S-VIDEO-C
GND
18
17
7
6
GND
S-VIDEO-C
PROTECT-2
S-SW
GND
GND
S-VIDEO-Y
161113
15
9
8
101412
GND
GND
S-VIDEO-Y
SDA
SCL
GND
CVBS
GNDNUGNDNUAL+3.3V(A)
9
101412
11
13
15
NU
GNDNUGND
CVBS
AL+3.3V(A)
P-25V-ON
GND
AL+5V
23
NU
724
8
16
17
NU
BUS-OPEN
DVD-MAIN-POWER(NU)
6
18
1923212022
BUS-OPEN
DVD-MAIN-POWER(NU)
GND
AL+7V(D)
GND
AL+7V(D)
GND
GND
FSC
153
FSC
KEY-IN-2
CN104
132
1
CLN104
KEY-IN-2
AL+3.3V(D)
KEY-IN-1
3
2
KEY-IN-1
AL+3.3V(D)
GND
4
4
GND
NUNUNU
576
5
NU
CN105
134
1
AL+5V
CLN105
2
2
GND
3
REMOTE
P-ON-H
5
5
4
NU
P-ON-H
IR SENSOR CBA
NU
8
FUNCTION CBA
NU
REMOTE
AL+5V
GND
9
724
6
8
INPUT-0
INPUT-1
AUDIO-MUTE
P-ON-H2(NU)
101412
AFT-IN
PROTECT-1
CN802
SP-L
1
PROTECT-2
GND
2
CLN802
S-SW
SCL
NU
CN102B
GND
BACKLIGHT-ADJ
GND
1923212022
BACKLIGHT-SW
18
17
NU
NU
CN801
SP-R
1
161113
15
P-ON-H
VOLUME
GND
2
CLN801
LCD MAIN CBA
SP801
SPEAKER
SP802
SPEAKER
153
SDA
GND
GND
AL+5V
P-25V-ON
AC CORD
AC601
TU1 TUNER UNIT
MAIN CBA
CLN411
AL+21V
AL+21V
AL+21V
GND
153
2
4
153
2
4
GND
CN411
AL+21V
AL+21V
AL+21V
GND
GND
GND
6
6
GND
GND
7
7
GND
BACKLIGHT-SW
8
8
BACKLIGHT-SW
BACKLIGHT-ADJ
9
9
BACKLIGHT-ADJ
PROTECT-1
10
10
PROTECT-1
S-VIDEO
OUT IN
P-ON-H
11
11
P-ON-H
VIDEO1
-IN
AUDIO1(R)
-IN
VIDEO
-Y IN
AUDIO1(L)
-IN
VIDEO
-Pb/Cb IN
AUDIO2(R)
-IN
VIDEO
-Pr/Cr IN
AUDIO2(L)
-IN
INVERTER CBA
CN450
1
BACK
2
LIGHT
CN490
1
BACK
2
LIGHT
CN460
1
BACK
2
LIGHT
LCD MODULE
1
CN312
GND
2NU3
CN311
5NU6
V-COM4V-COM
GND
HMS1-E
ER(0)
ER(1)
ER(2)
ER(3)
ER(4)
ER(5)
132547689
7NU8
9
10
11NU12
13
NU
STV1
OFFEV
VEEG(-6V)
VDDG(+25V)
VDDD(+3.3V)
GND
CLKH
GND
GND
HMS1-0
GND
OB(5)
OB(4)
OB(3)
OB(2)
OB(1)
OB(0)
GND
OG(5)
OG(4)
OG(3)
OG(2)
OG(1)
OG(0)
101312111415171619182120222324272625282930
14
15NU16
CLKV
17NU18NU19NU20NU21
GND
22
GND
VREF(9)23VREF(8)24VREF(7)25VREF(6)26VREF(5)
27
28
GND
VREF(4)29VREF(3)30VREF(2)31VREF(1)32VREF(0)
GND
OR(5)
OR(4)
OR(3)
33
35
V-COM36V-COM
VDDA(+10.8V)34VDDA(+10.8V)
OR(2)
OR(1)
OR(0)
GND
GND
VDDD(+3.3V)
VDDD(+3.3V)
VDDD(+3.3V)
333231
3435373639384140424344
37
38
GND
EB(5)39EB(4)40EB(3)41EB(2)42EB(1)43EB(0)
44
GND
VDDD(+3.3V)
GND
STH1
POLLPGND
45
45
EG(5)46EG(4)47EG(3)48EG(2)49EG(1)50EG(0)
L3202WI10-1
Page 20
EWL2005
L3202UC
2005-04-06
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