Emerson EWL2005 User manual

SERVICE MANUAL

20″COLOR LCD TELEVISION

EWL2005

4-2 L3202DC

S-2

S-1

Fig. D1

[1] Rear Cabinet

Fig. D2

S-10

S-9

S-8

S-10

S-7

S-3

S-6

S-6 S-5

S-5

S-4

S-7

S-3 S-6

S-6

[5] LCD Main CBA & Liquid Crystal Panel Unit

[7] IR Sensor CBA

[4] Main CBA

[3] Inverter CBA

[2] Jack Holder

[6] Function CBA

[8] Speaker

[9] Front Cabinet

4-3 L3202DC

TV Cable Wiring Diagram

CN101ACN102A

CN802CN801

Function CBA

IR Sensor CBA

Inverter CBA

Main CBA

LCD Main

CBA Unit

To Speaker

CN103A

CN312

CN311

CN460

CN101B

CN102B

CN103B

CLN411

CN411

CN490 CN450

CN105

To Liquid Crystal Panel

Fig. D3

CN104

CLN104

CLN105

CN111

CN113

CN112

7-1

BLOCK DIAGRAMS

System Control Block Diagram

L3202BLS

FUNCTION CBA

IC333 (TV MICRO CONTROLLER)

KEY-IN-122

CN104 CLN104

KEY SWITCH

KEY-IN-1

REMOTE

RESET RESET

Q151

P-ON+3.3V(D)

43 X161

27MHz

XIN

XOUT

MAIN CBALCD MAIN CBA UNIT

KEY-IN-211

KEY-IN-2

BACKLIGHT-SW

19 5

BACKLIGHT-ADJ

21 3

P-ON-H16 8

VOLUME15 9

AUDIO-MUTE

13 11

INPUT-012 12

INPUT-111 13

S-SW717

SCL618

SDA519

BACKLIGHT-SW

BACKLIGHT-ADJ

P-ON-H

VOLUME

AUDIO-MUTE

SDA

SCL

INPUT-0

INPUT-1

S-SW

SCL

SDA

41 TO POWER SUPPLY

BLOCK DIAGRAM

TO IF/VIDEO

BLOCK DIAGRAM

TO AUDIO

BLOCK DIAGRAM

BACKLIGHT-SW

BACKLIGHT-ADJ

P-ON-H

VOLUME

AUDIO-MUTE

INPUT-0

INPUT-1

S-SW

SCL

SDA

TO LCD BACKLIGHT

BLOCK DIAGRAM

CN102B CN102A

SDA 2

SCL 1

CN112(NO CONNECTION)

IC171

(MEMORY)

SCL 6

SDA 5

Q131

3.3V<-->5V

CONVERTER

BUS-OPEN 4

NO PART

MOUNTED

FOR CN112

BUS-OPEN

P-ON-H2(NU)

14 1016

P-ON-H2

P-25V-ON P-25V-ON

TO POWER

SUPPLY

BLOCK

DIAGRAM

KEY SWITCH

IR SENSOR CBA

CLN105 REMOTE

SENSOR

RCV102

AL +5V

D102

POWER

Q102

P-ON-H44

CN105 REMOTE33

INVERTER CBA

BACKLIGHT-ADJ

CN411 CLN411

BACKLIGHT-SW

P-ON-H11 11 P-ON-H

AFT-IN10 145AFT-IN

TUNERCLK

Q301

BUFFER AFT-IN

BUS-OPEN519

CN103B CN103A

CN113 (NO CONNECTION)

SDA

2SCL

BUS-OPEN

4CN113 IS USED

FOR ADJUSTMENT

AT FACTORY

P-ON-H

FSC123

FSC

7-2 L3202BLIF

IF/Video Block Diagram

TO AUDIO

BLOCK DIAGRAM

CN103A TO

LCD BLOCK

DIAGRAM

CN103B

CVBS11 S-VIDEO-C7 S-VIDEO-Y9

INPUT-0(INV)

INPUT-1(INV)

SAW

FILTER

TU1 SF11

AGC

SDA

SCL

SIF

MAIN CBA

VIDEO SIGNAL AUDIO SIGNAL

TO AUDIO BLOCK

DIAGRAM

JK706

VIDEO-Y

JK707

VIDEO-Pb/Cb

JK708

VIDEO-Pr/Cr

JK703

VIDEO1

-IN

JK701

S-VIDEO

BUFFER

Q32

SDA

SYSTEM

CONTROL

BLOCK

DIAGRAM

SCL

S-SW

CN103A TO

LCD BLOCK

DIAGRAM

CN103B

VIDEO-Y5

VIDEO-Pb/Cb

VIDEO-Pr/Cr

IC781 (INPUT SELECT)

Q703

Q702

Q701

CONTROL

911

INPUT-0

INPUT-1

TO SYSTEM CONTROL

BLOCK DIAGRAM

Q707

Q708

Q704

Q705

Q706

(TUNER UNIT)

BUFFER

WF7

WF8

WF9

WF10

WF11

WF12

CF31

IC31 (IF SIGNAL PROCESS)

VIF

AMP VIDEO

DET

VCO

4.5MHz

FILTER

AGC

AMP

SIF

AMP

17 478

XTAL-IN 14

TO SYSTEM CONTROL

BLOCK DIAGRAM

AFT-IN

SIF

TRAP

IF AGC DET

AFT EQ

AMP

DEFEAT

FSC

7-3

Audio Block Diagram

L3202BLA

MAIN CBA

AUDIO SIGNAL

AUDIO-MUTE

VOLUME TO SYSTEM

CONTROL BLOCK

INPUT-0(INV)

INPUT-1(INV)

SCL

SDA

IC852 (INPUT SELECT)

SW CTL

9 10

STEREO

FILTER 75uS

DE-EMPH

dBX

DE-EMPH

L+R

FILTER

WIDE BAND

FILTER WIDE BAND

RMS DET WIDE BAND

EXPAND

SPECTRAL

EXPAND

SPECTRAL

RMS DET

SPECTRAL

FILTER

OFFSET

CANCEL

L-CH

R-CH

MATRIX AGC

OFFSET

CANCEL L-R

FILTER (L-R)/SAP

SAP

FILTER

I2C

DECORDER

SAP

DEMOD SAP OUT

FILTER

IF/VIDEO BLOCK

DIAGRAM

TUNER

(L-CH)

(R-CH)

IC851 (MTS/SAP AUDIO SIGNAL PROCESS)

AUDIO1(L)

-IN

JK704

SIF

JK705

AUDIO1(R)

-IN

JK709

AUDIO2(L)

-IN

JK710

AUDIO2(R)

-IN

OFFSET

CANCEL

IC801(AUDIO AMP)

VOLUME

AMP

MUTE

/STANDBY

CONTROL

(R-CH)

(L-CH)

Q802

Q803

JK801

HEADPHONE

JACK

SP801

SPEAKER

R-CH

CN801

SP-R 1

GND 2

SP802

SPEAKER

L-CH

CN802 CLN802

CLN801

SP-L 1

GND 2

+5V

TO IF/VIDEO

BLOCK DIAGRAM

WF6

AUDIO1

AUDIO2

AUDIO1

AUDIO2

SIF/BB

INPUT

VCA

SIF

DEMOD

P-ON-H

7-4

LCD Block Diagram

L3202BLLCD

CN311

IF/VIDEO

BLOCK

DIAGRAM

CN103A

OR(0)34 OR(1)33

LCD MAIN CBA UNIT

VIDEO SIGNAL

CVBS 13

S-VIDEO-C 17

CN103B

IC333 (LCD DRIVE / SIGNAL PROCESS)

S-VIDEO-Y 15

IF/VIDEO

BLOCK

DIAGRAM

CN103A

VIDEO-Y 19

VIDEO-Pb/Cb

CN103B

LCD MODULE

OR(2)32 OR(3)31 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

CN311

170

169

166

165

164

163

162

161

157

156

155

154

153

152

148

147

146

145

138

137

136

135

130

129

128

127

126

125

118

117

116

115

114

113

108

107

101

105

106

144

139

172

173

174

A/D

VIDEO

SIGNAL

PROCESS

LCD RGB

SIGNAL

PROCESS

Pb/Cb

Pr/Cr B(EVEN)

G(EVEN)

R(EVEN)

B(ODD)

G(ODD)

R(ODD)

CN312

A/D

VIDEO-Pr/Cr

WF3

ODDINV

EVENINV

STH-1

POL

OFFEV

STV1

CLKV

CLKH10

143

CLKH1

WF1

WF5

WF2

CVBS

R201

R202

R394

R365

R392

WF4

7-5

Power Supply Block Diagram

L3202BLP

4A/125V

F601

4A/125V LINE

FILTER

L601

AC601

AC CORD

BRIDGE

RECTIFIER

D605 - D608

HOT COLD

T601

IC601

ERROR

VOLTAGE DET

Q601

Q603

SWITCHING

CONTROL

SWITCHING

MAIN CBA

PANEL+3.3V

PANEL+10.8V

PANEL+25V73

PANEL-6V82

VT+33V

Q511

Q513

IC533

+5V REG.

HOT CIRCUIT. BE CAREFUL.

LINE

FILTER

L602

AL+13V

Q509

Q505

Q510

Q512

CN101A

P-25V-ON21 3

AL+5V22 2

CN102A

Q502

Q501

IC671

+5V REG.

IC672

+5V REG.

REG+5V

IC531

+7V REG.

Q531

P-ON-H

AL+7V(D)

AL+5V

AL+21V

TO SYSTEM

CONTROL

BLOCK

DIAGRAM

TP401

+21V

Q633

CN101B

PANEL+3.3V

PANEL+10.8V

PANEL+25V

PANEL-6V

LCD MAIN CBA UNIT

P-25V-ON

AL+5V

CN102B

TO SYSTEM

CONTROL

BLOCK

DIAGRAM

TO LCD

BACKLIGHT

BLOCK

DIAGRAM

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.

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.

4A/125V

NOTE:

The voltage for parts in hot circuit is measured using

hot GND as a common terminal.

7-6

LCD Backlight Block Diagram

L3202BLIV

CURRENT

CONTROL

SWITCH

CURRENT

CONTROL

SWITCH

BACKLIGHT-SW

RL401

Q421,

Q426

IC401 (DC-AC INVERTER CONTROL)

Q403

Q412

VCC

T450

CN450

LCD MODULEINVERTER CBA

P-ON-H

BACKLIGHT-ADJ

Q433

Q411

BACK

LIGHT

BACK

LIGHT

BACK

LIGHT

+8V

REG.

OUTPUT

LOGIC1

OUTPUT

LOGIC2

LOGIC

OVER

VOLTAGE

PROTECT

SLOW

START

OSC

PWM2

PWM1

STANDBY

MODE SW

OVER VOLTAGE

PROTECTOR

Q451,452

OVER VOLTAGE

PROTECTOR

Q454,455

7 6 98 1 2

13 14

T490 CN490

OVER VOLTAGE

PROTECTOR

Q491,492

T460 CN460

OVER VOLTAGE

PROTECTOR

Q461,462

IC402

(OP AMP)

SYSTEM

CONTROL

BLOCK

DIAGRAM

AL+21V

POWER

SUPPLY

BLOCK

DIAGRAM

MAIN CBA

AL+21V22

CN411 CLN411

AL+21V11

AL+21V33

8-3

Main 1/4 Schematic Diagram

L3202SCM1

MAIN 1/4

Ref No. Position

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

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