FUNAI LCD-A2006 User manual

SERVICE MANUAL

20"COLOR LCD TELEVISION

LCD-A2006/LCD-B2006/

LCD-C2006/LCD-D2006

4-4 L4620DC

TV Cable Wiring Diagram

Fig. D4

IR Sensor CBA

CN310

To Speaker

Function CBA

CN801

To Speaker

CLN53

CN101A

CN102A

CN103A

CN101B

CN102B

CN103B

Main CBA

CN404 CN304

Inverter CBA

CN301

CN302

CN303

CN53

CN106

CN31B

CN311 CN312

LCD Main

CBA Unit

To Liquid

Crystal

Panel Unit

To Liquid

Crystal

Panel Unit

7-1

System Control Block Diagram

L4620BLS

BLOCK DIAGRAMS

FUNCTION CBA

KEY-IN-122

CN31B

KEY-IN-211

IR SENSOR CBA

CLN53 RCV51

D51

RCV-IN33 REMOTE

SENSOR

IC151

(MICRO COMPUTER)

CN103B CN103A

RCV-IN11

BACKLIGHT-ADJ

P-ON-H66

PROTECT-113 13

PROTECT-214 14

VOLUME77

INPUT-099

INPUT-110 10

S-SW15 15

SCL18 18

SDA19 19

KEY-IN-1

RCV-IN

BUS-OPENV

RESET

P-ON-H

PROTECT-1

PROTECT-2

VOLUME

SDA

SCL

INPUT-0

INPUT-1

S-SW

SCL

SDA

X151

10MHz

XIN

XOUT

TO POWER SUPPLY

BLOCK DIAGRAM

TO AUDIO

BLOCK DIAGRAM

BACKLIGHT-ADJ

P-ON-H

PROTECT-1

PROTECT-2

VOLUME

INPUT-0

INPUT-1

S-SW

SCL

SDA

MAIN CBALCD MAIN CBA UNIT

KEY-IN-2

CN106

CN53

RESET

IC153

AL+5V

CN102B CN102A

EEP-SDA 2

EEP-SCL 1

BUS-OPEN 4

CN105(NO CONNECTION)

IC152

(MEMORY)

SCL 6

SDA 5

AL+5V

CN105 IS

USED FOR

ADJUSTMENT

AT FACTORY

MPWEL

MPCE

MPOE

MPSEL-0

MPWEH

RESET

HDIN/FBIN

BUS-OPEN 2

DVP-RESET-PC

DVP-CLK-PC

CN301(NO CONNECTION)

DVP-SOUT-PC

DVP-SIN-PC

DVP-CS-PC

MPSEL-0 3

Q156

3.3V<-->5V

CONVERTER

Q155

3.3V<-->5V

CONVERTER

Q152

3.3V<-->5V

CONVERTER

Q154

3.3V<-->5V

CONVERTER

Q153

3.3V<-->5V

CONVERTER

AL+3.3V

2DVP-SOUT

2DVP-CS

2DVP-CLK

42DVP-SIN

H-SYNC

2DVP-RESET

91 AFT-IN11 11

AFT-IN

23 SLOW-SW17 17

SP-MUTE18 18

FBIN22 22

SLOW-SW-IN

SP-MUTE

84INSEL-MUTE

87 RAPID-SW16 16

RAPID-SW-IN

INSEL-MUTE

15 15

P-25V-ON21 21

NICAM-RESET

20 20

P-25V-ON

SC-VIDEO-MUTE

NICAM-RESET

S/C-JACK-MUTE

14 14

34 EEP-SCL

EEP-SDA

S/C-JACK-MUTE

SP-MUTE

INSEL-MUTE

NICAM-RESET

FBIN

RAPID-SW

SLOW-SW

S/C-JACK-MUTE

TO IF/VIDEO

BLOCK DIAGRAM

AFT-IN

IC301

P-25V-ON

BACKLIGHT-ADJ

PROTECT-1

TO LCD BACKLIGHT

BLOCK DIAGRAM

KEY SWITCH

LCD DRIVE / LCD

SIGNAL PROCESS

POWER

VCOM

TO LCD

BLOCK DIAGRAM

7-2

IF/Video Block Diagram

L4620BLIF

JK751

VIDEO-B

VIDEO-G

VIDEO-R

AUDIO

BLOCK DIAGRAM

CN103A

INPUT-0(INV)

INPUT-1(INV)

TU1

SIF

SDA

SCL

SIF

MAIN CBA

VIDEO SIGNAL AUDIO SIGNAL

TO AUDIO BLOCK

DIAGRAM

Q734

JK722

VIDEO1

-IN

JK721

S-VIDEO

-IN

TO SYSTEM

CONTROL

BLOCK

DIAGRAM

LCD BLOC

DIAGRAM

CN103B

IC781 (INPUT SELECT)

CONTROL

911

INPUT-0

INPUT-1

SYSTEM CONTROL

BLOCK DIAGRAM

Q872

Q871

(TUNER UNIT)

BUFFER

WF7

WF2

WF3

WF6

WF5 WF4

CVBS18

S-VIDEO-C5

S-VIDEO-Y6

VIDEO-R1

VIDEO-G2

VIDEO-B3

CVBS29

VIDEO-IN

VIDEO-OUT

SLOW-SW

RAPID-SW

AFT

VIDEO

Q781

BUFFER

WF8

SDA

SCL

S-SW

AUDIO AUDIO

AFT-IN

S/C-JACK-MUTE

FBIN

Q11

SLOW-SW

Q731

RAPID-SW

Q730

Q791

Q792

BUFFER

Q744

BUFFER

7-3

Audio Block Diagram

L4620BLA

MAIN CBA

AUDIO SIGNAL

VOLUME

TO SYSTEM

CONTROL

BLOCK

INPUT-0(INV)

INPUT-1(INV)

SCL

SDA

IC871 (INPUT SELECT)

SW CTL

9 10

dBX/MNR

PANDA1

FM/AM

PRESCALE

I2C READ

AUTOMATIC

SOUND

SELECT

NICAM

PRESCALE

L-CH

R-CH

AGC DEMODULATOR

A/D

CONVERTER

I2C

DECORDER

TO IF/VIDEO

BLOCK

DIAGRAM

TUNER

AUDIO1

AUDIO2

TUNER

AUDIO1

AUDIO2

(L-CH)

(R-CH)

IC831 (SOUND PROCESSOR)

AUDIO1(L)

-IN

JK723

SIF

JK724

AUDIO1(R)

-IN

IC801 (AUDIO AMP)

VOLUME

AMP

MUTE

/STANDBY

CONTROL

(R-CH)

(L-CH)

JK801

HEADPHONE

JACK

CN801

SP-R 1

GND 2

TO IF/VIDEO

BLOCK

DIAGRAM

WF1

CLN801

SP801

SPEAKER

R-CH

TO SYSTEM

CONTROL

BLOCK

DIAGRAM NICAM-RESET

AUDIO

RESET

INH

JK751

AUDIO2(L)

-OUT

AUDIO2(R)

-OUT

AUDIO2(L)

-IN

AUDIO2(R)

-IN

Q732 Q733

Q741

Q742

INSEL-MUTE

S/C-JACK-MUTE

SP-MUTE

DEEMPHASIS

SOUND

SELECT

D/A

CONVERTER VOLUME

SCART1 OUTPUT SELECT SCART1

CHANNEL

MATRIX

STANDERD

AND SOUND

DETECTION

BUFFER

SP802

SPEAKER

L-CH

CN310

CN304

CN404 CLN310

SP-L 1

GND 2

INVERTER CBA

SP-L22

GND11

7-4 L4620BLLCD

LCD Block Diagram

LCD MAIN CBA UNIT

VIDEO SIGNAL

IC301 (LCD DRIVE / LCD SIGNAL PROCESS)

IF/VIDEO

BLOCK

DIAGRAM

CN103A

CN103B

182

181

180

179

175

174

173

QDRVHC

QDRVVB

QDRVHB

QDRVHA/QDE

QDRVVA

QDRVHE

QCLKL

LCD MODULE

VREF(4) 28

VREF(0) 32

VREF(1) 31

VREF(2) 30

VREF(3) 29

VREF(7) 24

VREF(5) 26

VREF(6) 25

VREF(8) 23

VREF(9) 22

104

105

103

VCOM 35

VCOM 36

PANEL+10.8V

CN311

169

168

167

166

165

161

160

159

158

155

154

153

152

151

150

146

145

LCD MODULE

TP322

TP323

TP318

TP319

TP320

TP321

143

142

141

140

139

135

134

133

132

131

130

129

128

127

123

122

121

120

119

116

115

114

113

106

TP316

TP317

TP312

TP313

TP314

TP315

CN312

OR(3)

OR(4)

OR(5)

OR(0)

OR(1)

OR(2)

OG(3)

OG(4)

OG(5)

OG(0)

OG(1)

OG(2)

OB(3)

OB(4)

OB(5)

OB(0)

OB(1)

OB(2)

ER(3)

ER(4)

ER(5)

ER(0)

ER(1)

ER(2)

EG(3)

EG(4)

EG(5)

EG(0)

EG(1)

EG(2)

EB(3)

EB(4)

EB(5)

EB(0)

EB(1)

EB(2)

CVBS1 8

CVBS2 9

S-VIDEO-C 5

S-VIDEO-Y 6

VIDEO-B 3

VIDEO-R 1

VIDEO-G 2

VCOM 3

VCOM 4

CN312

84 85

X301

54MHz

XIN XOUT

CLKV 14

VCOM

CONTROL

Q971

IC981

STV1 13

LP 44

CN311

POL 43

HMS1-E 7

CLKH 10

STH1 42

HMS1-O 13

WF11

WF10 WF12

WF9

VIDEO

SIGNAL

PROCESS

NTSC/PAL

SEPARATION

BURST

LOCKED

OUTPUT

CONTROL

CHROMA

DECODER

SECAM PDM

RCO

PANEL

SIGNAL

PROCESS

SIGNAL

PROCESS

INPUT

CONTROL

CVBS

A/D

QDRVHC

WF14WF13

R905

R907

R901

R904

R902

R997

VCOM

SYSTEM

CONTROL

BLOCK

DIAGRAM

7-5 L4620BLP

Power Supply Block Diagram

LINE

FILTER

L601

AC601

AC CORD

BRIDGE

RECTIFIER

D605-D608

HOT COLD

T601

MAIN CBA

CN101A

HOT CIRCUIT. BE CAREFUL.

AL+33V

AL+3.3V

AL+7.5V

INV+22V

P-ON-H

P-25V-ON

AL+5V

IC601

IC606

ERROR

VOLTAGE

DET

T-ON+5V

CN103A

AL+12V

PROTECT-1

CN101B

PANEL+25V

PANEL+3.3V

PANEL+10.8V

PANEL+25V

PANEL+3.3V

LCD MAIN CBA UNIT

PANEL-6V

99PANEL-6V

PANEL+10.8V

CN103B

AL+4V(D)13 13

AL+5V(D)12 12

AL+3.3V10 10

REG+3.3V

REG+1.8V

AL+3.3V

IC101

+3.3V

REG

IC102

+1.8V

REG

AL+40V

TO SYSTEM CONTROL

BLOCK DIAGRAM

TO INVERTER

BLOCK DIAGRAM

F601

T4A L 250V

Q608

Q603

Q504

Q633

Q502

Q632

Q507

Q506

-6V REG.

+5V REG. IC602

+3.3V REG.

IC605

+5V REG.

Q501

+25V REG.

Q503

+10.8V REG.

Q505

PROTECT-2

AL+5V11 11 AL+5V

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.

NOTE:

The voltage for parts in hot circuit is measured using

hot GND as a common terminal.

CAUTION !

For continued protection against fire hazard,

replace only with the same type fuse.

7-6 L4620BLLB

LCD Backlight Block Diagram

CURRENT

CONTROL

SWITCH

Q321

Q324

T301 CN301

LCD MODULEINVERTER CBA

BACK

LIGHT

BACK

LIGHT

BACK

LIGHT

OVER VOLTAGE

PROTECTOR

Q322,323

CN302

CN303

INV+22V

AL+40V

BACKLIGHT

-ADJ

PROTECT-1

POWER

SUPPLY

BLOCK

DIAGRAM

SYSTEM

CONTROL

BLOCK

DIAGRAM

MAIN CBA

+22V77

CN404 CN304

+22V66

+22V55

+22V44

+22V88

+22V99

CURRENT

CONTROL

SWITCH

Q341

Q344

T302

OVER VOLTAGE

PROTECTOR

Q342,343

CURRENT

CONTROL

SWITCH

Q361

Q364

T303

OVER VOLTAGE

PROTECTOR

Q362,363

OVER VOLTAGE

PROTECTOR

Q304

Q306

+10V REG.

OVER CURERENT

PROTECTOR

Q325

Q305

PROTECT-133

Q401

Q402

Q403

8-3 L4620SCM1

Main 1/4 Schematic Diagram

8-4 L4620SCM2

Main 2/4 Schematic Diagram

CN103A

10.1

20.4

30.2

52.6

62.6

81.7

90.2

10 0

11 3.5

12 5.2

13 6.9

14 3.1

15 0

16 4.8

17 0

18 5.2

19 0

20 5.2

21 3.3

22 3.1

23 0

VOLTAGE CHART

Pin No. Voltage

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