Zenith D52WLCD4 Series User manual

SERVICE MANUAL

Product Type: Rear Projection LCD

Chassis: 094A

Manual Part #: 923-03485R1

Manual Series: PV154

Model Line: E

Product Year: 2002

Model Series:

D52WLCD

D52WLCD4

Printed in U.S.A.

General Info ................................................. 1

Service Menu ................................................ 2

Servicing ..................................................... 3

Parts List ..................................................... 4

Diagrams ...................................................... 5

Schematics ................................................... 6

CONTENTS

REVISED EDITION

Published July 2003

by Technical Publications

LG Electronics of Alabama, Inc.

201 James Record Road

Huntsville, Alabama 35824-1513

First revison - Training material added

D52WLCD SAFETY

PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS

i

IMPORTANT SAFETY NOTICE

This manual was prepared for use only by properly trained audio-video service

technicians.

When servicing this product, under no circumstances should the original

design be modified or altered without permission from Zenith Electronics

Corporation. All components should be replaced only with types identical to

those in the original circuit and their physical location, wiring and lead dress

must conform to original layout upon completion of repairs.

Special components are also used to prevent shock and fire hazard. These

components are indicated by the letter “x” included in their component

designators and are required to maintain safe performance. No deviations are

allowed without prior approval by Zenith Electronics Corporation.

Circuit diagrams may occasionally differ from the actual circuit used. This way,

implementation of the latest safety and performance improvement changes into

the set is not delayed until the new service literature is printed.

CAUTION: Do not attempt to modify this product in any way. Never perform

customized installations without manufacturer’s approval. Unauthorized

modifications will not only void the warranty, but may lead to property damage

or user injury.

Service work should be performed only after you are thoroughly familiar with

these safety checks and servicing guidelines.

GRAPHIC SYMBOLS

The exclamation point within an equilateral triangle is intended

to alert the service personnel to important safety information in

the service literature.

The lightning flash with arrowhead symbol within an equilateral

triangle is intended to alert the service personnel to the presence

of noninsulated “dangerous voltage” that may be of sufficient

magnitude to constitute a risk of electric shock.

The pictorial representation of a fuse and its rating within an

equilateral triangle is intended to convey to the service personnel

the following fuse replacement caution notice:

CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,

REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED

NEAR EACH FUSE.

SERVICE INFORMATION

While servicing, use an isolation transformer for protection from AC line shock.

After the original service problem has been corrected, make a check of the

following:

FIRE AND SHOCK HAZARD

1. Be sure that all components are positioned to avoid a possibility of

adjacent component shorts. This is especially important on items trans-

ported to and from the repair shop.

2. Verify that all protective devices such as insulators, barriers, covers,

shields, strain reliefs, power supply cords, and other hardware have been

reinstalled per the original design. Be sure that the safety purpose of the

polarized line plug has not been defeated.

3. Soldering must be inspected to discover possible cold solder joints, solder

splashes, or sharp solder points. Be certain to remove all loose foreign

particles.

4. Check for physical evidence of damage or deterioration to parts and compo-

nents, for frayed leads or damaged insulation (including the AC cord), and

replace if necessary.

5. No lead or component should touch a high current device or a resistor

rated at 1 watt or more. Lead tension around protruding metal surfaces

must be avoided.

6. After reassembly of the set, always perform an AC leakage test on all exposed

metallic parts of the cabinet (the channel selector knobs, antenna terminals,

handle and screws) to be sure that set is safe to operate without danger of

electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS

TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in

the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by

a .15 mfd 150V AC type capacitor between a known good earth ground

water pipe, conduit, etc.) and the exposed metallic parts, one at a time.

Measure the AC voltage across the combination of 1500 ohm resistor and

.15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor

and repeat AC voltage measurements for each exposed metallic part. Voltage

measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp

AC. Any value exceeding this limit constitutes a potential shock hazard and

must be corrected immediately.

TIPS ON PROPER INSTALLATION

1. Never install any receiver in a closed-in recess, cubbyhole, or closely

fitting shelf space over, or close to, a heat duct, or in the path of heated

air flow.

2. Avoid conditions of high humidity such as: outdoor patio installations

where dew is a factor, near steam radiators where steam leakage is a factor,

etc.

3. Avoid placement where draperies may obstruct venting. The customer

should also avoid the use of decorative scarves or other coverings that

might obstruct ventilation.

4. Wall- and shelf-mounted installations using a commercial mounting kit

must follow the factory-approved mounting instructions. A product mounted

to a shelf or platform must retain its original feet (or the equivalent

thickness in spacers) to provide adequate air flow across the bottom. Bolts

or screws used for fasteners must not touch any parts or wiring. Perform

leakage tests on customized installations.

5. Caution customers against mounting a product on a sloping shelf or in a

tilted position, unless the receiver is properly secured.

6. A product on a roll-about cart should be stable in its mounting to the cart.

Caution the customer on the hazards of trying to roll a cart with small

casters across thresholds or deep pile carpets.

7. Caution customers against using a cart or stand that has not been listed

by Underwriters Laboratories, Inc. for use with its specific model of

television receiver or generically approved for use with TVs of the same or

larger screen size.

8. Caution customers against using extension cords. Explain that a forest of

extensions, sprouting from a single outlet, can lead to disastrous

consequences to home and family.

REGULATORY INFORMATION

This equipment has been tested and found to comply with the limits for a Class

B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed

to provide reasonable protection against harmful interference when the equip-

ment is operated in a residential installation. This equipment generates, uses

and can radiate radio frequency energy and, if not installed and used in

accordance with the instruction manual, may cause harmful interference to radio

communications. However, there is no guarantee that interference will not occur

in a particular installation. If this equipment does cause harmful interference to

radio or television reception, which can be determined by turning the equip-

ment off and on, the user is encouraged to try to correct the interference by one

or more of the following measures: Reorient or relocate the receiving antenna;

Increase the separation between the equipment and receiver; Connect the equip-

ment into an outlet on a circuit different from that to which the receiver is

connected; Consult the dealer or an experienced radio/TV technician for help.

The responsible party for this device’s compliance is:

Zenith Electronics Corporation

201 James Record Road

Huntsville, AL 35824, USA

Digital TV Hotline: 1-800-243-0000

D52WLCD 3 OVERVIEW

OVERVIEW

OVERVIEW ........................................................ 5

SPECIFICATIONS ............................................. 5

FUNCTION OVERVIEW ...................................... 6

REMOTE CONTROL DESCRIPTIONS ....................... 9

REMOTE CODES ............................................. 11

THEORY .......................................................... 15

OPTICS ENGINE ............................................ 15

LIQUID CRYSTALS ......................................... 18

LIQUID CRYSTAL PANEL ................................. 18

TERMINOLOGY .............................................. 19

CIRCUIT DESCRIPTIONS ..................................... 20

BLOCK DIAGRAMS ............................................. 30

DISASSEMBLY .................................................. 34

LAMP REPLACEMENT ..................................... 34

CABINET DISASSEMBLY .................................. 35

ELECTRICAL DISASSEMBLY .............................. 37

ADJUSTMENTS ................................................. 38

EXPLODED VIEW ............................................... 44

PARTS ............................................................ 46

SCHEMATICS .................................................... 53

MAIN CIRCUIT ............................................. 53

DIGITAL CIRCUIT .......................................... 54

MICROPROCESSOR CIRCUIT ............................. 55

DIGITAL MICROPROCESSOR CIRCUIT ................. 56

DECODER CIRCUIT ......................................... 57

DRIVER CIRCUIT .......................................... 58

LCD DRIVER CIRCUIT - GREEN ......................... 59

LCD DRIVER CIRCUIT - RED ............................ 60

LCD DRIVER CIRCUIT - BLUE .......................... 61

I/O SWITCH CIRCUIT ..................................... 62

KEYBOARD & LED CIRCUIT .............................. 63

POWER SUPPLY CIRCUIT ................................ 64

TUNER CIRCUIT 1/2 ...................................... 65

TUNER CIRCUIT 2/2 ...................................... 66

D52WLCD 5 OVERVIEW

OVERVIEW

Power requirements 120V, 60 Hz

Number of inputs/outputs

Video (In) 3 1 Vp-p, 75 ohms unbalanced, sync negative

Video (Out) 1

S Video (In) 1 Y: 1 Vp-p, 75 ohms unbalanced, sync negative

C: 0.280 Vp-p (burst signal), 75 ohms

Audio (In) 6 500 mVrms (100% modulation), Impedance: 47 kilohms

Center Mode (In) 1

Audio out 1

More than 408 mVrms at the maximum volume setting (variable)

1 More than 408 mVrms (fix)

Impedance (output): 2 kohms

Component input 2 Y: 1.0 Vp-p, 75 ohms w/sync

2 PB: 0.7 Vp-p, 75 ohms

2 PR: 0.7 Vp-p, 75 ohms

PC/DTV Inputs 1 15 pin Sub “D” Female

Speaker output (W) 10W x2

Power consumption (W)

In use (max.) 230W

In standby 8W

TV

Weight (lbs) 121.9

Television system American TV Standard, NTSC, ATSC with STB

Channel coverage VHF: 2 - 13

UHF: 14 - 69

CATV: 1 - 125

Antenna 75 ohm external terminal for VHF/UHF

Screen Size 52” Width

Supplied accessories Remote control, batteries 2 size AA (Alkaline battery)

Screen Aspect Ratio 16 x 9

LCD Panel Size 0.87 inch

OVERVIEW

SPECIFICATIONS

D52WLCD 6 OVERVIEW

OVERVIEW

Function Status Indicators

Lamp indicator, operation indicator, and temperature indicator located below the front panel

controls, reveal the operating status of the LCD projection TV.

Operation Indicator

Lamp Indicator

Temperature Indicator

Off Power cord is not connected.

Red Power Cord is connected, TV is in standby mode.

Green On

Orange (flashing) Preparing operation in standby mode.

Orange

Projection lamp is reaching the end of its life and needs to

be replaced with a new lamp.

Red (flashing) There is a problem with the lamp or around it. Contact

an authorized service center.

Green (flashing) The lamp cover is not closed.

Orange The projection TV is overheating.

Red The projection TV shut down due to overheating.

Red (flashing) The projection TV shut down, check the cooling fan.

Operation Indicator

Lamp Indicator

Temperature Indicator

FUNCTION OVERVIEW

D52WLCD 7 OVERVIEW

OVERVIEW

On-Screen Displays

This page describes your on-screen display and information banner options.

10

AM 03:00

Ch. 13

MONO

Ch.6

Main Channel Display

Displays current channel number.

Channel Label

If a channel label has been

set, then it will appear here.

PIP Display

This display

appears when

PIP is active.

Volume

Volume level is displayed while

adjusting the sound.

Mute

Appears

when sound

is muted.

Time

Appears when

pressing the

enter button on

remote control.

ABC

D52WLCD 8 OVERVIEW

OVERVIEW

Front Panel Controls

power menu enter vol ch

Power On / Off

Menu

Enter (Same as ENTER button

on your remote control)

VOLUME UP / DOWN

CHANNEL UP / DOWN

Operation indicator.

Lamp indicator.

Temperature indicator.

1

2

3

4

1

2

4

3

6

7

8

5

6

7

8

D52WLCD 9 OVERVIEW

REMOTE CONTROL

Remote Control Functions in TV Mode

1 2 3

4 5 6

7 8 9

0

tv

mode

light

power

antenna

video

front

comp1 rgb

vcr

cable

dvd

sat

mute

swap pipch- pipch+

pip

menu

record stop

pause

rew

play ff

exit

flashbk surf

freeze

vol

ch

ratio

comp2

skip

source

enter

RATIO

Changes the screen format

or aspect ratio.

Not functional

EXIT

Clears all on-screen dis-

plays and returns to TV

viewing from any menu.

SURF

Scrolls the Surf channel

list.

PIPCH+

Changes to next higher PIP

channel.

PIP

Toggles between PIP, POP

(Picture-out-of-Picture) and

Split screen.

MUTE

Switch the sound on or off

THUMBSTICK

Allows you to navigate the on-

screen menus and to adjust the

system settings and preferences,

by moving to an option with

F G

and selecting the highlighted

option with . If is pressed while

you are in normal viewing, the

information banner is displayed.

ANTENNA

Selects the analog TV signal.

MODE

Selects the remote operating

mode: TV, VCR, Cable, DVD

and Satellite. Select other oper-

ating modes, for the remote to

control external devices.

VIDEO

Toggles between Video 1 and

Video 2 input sources.

FRONT

Selects the front video sig-

nal if a device, such as a

camcorder or game player,

is connected to the front

video input jack.

PIPCH-

Changes to next lower PIP

channel

SWAP

Swap the signal from

your PIP window to

the main screen.

LIGHT

Illuminates the remote con-

trol keys.

INDICATOR LIGHTS

Show active remote mode

every time any button is

pressed.

D

E

REMOTE CONTROL DESCRIPTIONS

D52WLCD 10 OVERVIEW

REMOTE CONTROL

Remote Control Functions in TV Mode

1 2 3

4 5 6

7 8 9

0

tv

mode

light

power

antenna

video

front

comp1 rgb

vcr

cable

dvd

sat

mute

swap pipch- pipch+

pip

menu

record stop

pause

rew

play ff

exit

flashbk surf

freeze

vol

ch

ratio

comp2

skip

source

enter

POWER

Turns your TV or any other

programmed equipment on

or off, depending on mode.

CHANNEL UP/DOWN

Scrolls through available

channels in EZ Scan memory.

NUMBER KEYPAD

For direct channel selection and

programming functions.

ENTER

When in the menu system

and other on-screen dis-

plays, selects high lighted

options.

RECORD, PAUSE, REW,

FFWD, PLAY, STOP

Control the functions on your VCR.

VOLUME UP/DOWN

Increases/decreases the sound

level.

MENU

Brings up the main menu

to the screen.

SKIP

Functions as a song selec-

tor in audio mode and a

movie chapter selector in

aux/DVD mode.

COMPONENT 1, 2

Selects component signal sources,

such as DVD or HD receiver.

“DASH” BUTTON

Use to enter a program number for

multiple program channels.

ENTER

When in the menu system

and other on-screen displays,

selects highlighted options.

FLASHBK

Tunes to the last channel

viewed.

FREEZE

Captures and freezes the

currently-viewed screen in

PIP.

RGB

Selects PC or RGB input

sources.

D52WLCD 11 OVERVIEW

REMOTE CONTROL

TVs

Brand Codes

A MARK 112 143

ADMIRAL 072 081 161

AKAI 006 146

AMPRO 073 167

AMSTRAD 052

ANAM 043 054 056

080 104 108

112 115 118

121 131

AOC 004 006 058

112

BLAUPUNKT 088

CANDLE 002 003 004

006

CAPEHART 058

CETRONIC 043

CITIZEN 002 003 004

006 043 101

103 143

CLASSIC 043

CONCERTO 004

CONTEC 039 043 050

051

CORONADO 143

CRAIG 043 054

CROWN 043 143

CURTIS MATHES 004 006 101

116 143

CXC 043

DAEWOO 004 016 017

043 044 055

071 076 103

107 111 114

117 120 123

125 127 128

136 143

DAYTRON 004 116 143

DYNASTY 043

DYNATECH 062

ELECTROHOME 024 077 143

EMERSON 004 005 006

028 043 047

048 050 051

096 116 143

151 153 154

155

FISHER 007 057

FUNAI 028 043

FUTURETECH 043

GE 004 006 008

009 034 056

073 074 091

116 130 144

155 160 161

165

Brand Codes

GOLDSTAR 004 102 106

110 112 113

116 119 122

127 137 143

HALL MARK 004 116

HITACHI 004 006 009

010 011 012

023 041 075

143 158 163

166

INFINITY 164

INKEL 129

JBL 164

JCPENNY 004 006 008

009 024 030

065 101 143

156 160

JENSEN 013

JVC 034 038 070

083 145

KEC 043

KENWOOD 006 070

KLOSS 002 059

KMC 143

KTV 006 043 143

154

LG 255

LODGENET 072

LOGIK 072

LUXMAN 004

LXI 007 015 052

081 160 164

166

MAGNAVOX 003 004 006

022 059 060

061 063 064

127 143 160

164

MARANTZ 006 077 164

MATSUI 164

MEMOREX 004 007 072

116

METZ 088

MGA 004 006 024

028 042 049

077 116

MINERVA 088

MITSUBISHI 004 006 024

028 040 042

109 116 124

146

MTC 004 006 062

101

NAD 015 025

NEC 006 007 016

Brand Codes

019 024 040

056 130 132

134

NIKEI 043

ONKING 043

ONWA 043

OPTONICA 019 081

PANASONIC 034 056 080

092 164

PHILCO 003 004 006

024 043 056

059 060 063

064 127 143

164

PHILIPS 003 004 005

006 038 059

070 093 143

160 164

PIONEER 006 018 023

025 027 116

135 176

PORTLAND 004 143

PROSCAN 144 160 161

165 167

PROTON 004 058 116

131 143 171

173

QUASAR 034 056 092

RADIO SHACK 019 043 047

116 127 143

RCA 004 006 023

024 056 065

074 144 152

156 160 161

165

REALISTIC 007 019 043

047

ROCTEC 186

RUNCO 168 169

SAMPO 004 006 058

116

SAMSUNG 004 050 089

101 105 113

116 127 133

137 143 160

SANYO 007 020 021

033 039 053

057 082 166

SCOTT 004 028 043

048 116 143

SEARS 004 007 015

028 030 057

082 094 101

116 143 160

Brand Codes

Sharp 004 014 019

022 028 029

081 143 170

175

SIEMENS 088

SIGNATURE 072

SONY 041 070 079

085 126 139

147 185

SOUNDESIGN 003 004 028

043 116

SPECTRICON 112

SSS 004 043

SUPRE MACY 002

SYLVANIA 003 004 006

044 059 060

063 064 116

127 140 160

164

TANDY 081

TATUNG 056 062

TECHNICS 034 080 084

TECHWOOD 004

TEKNIKA 002 003 004

006 024 028

031 043 072

077 101 103

143

TELEFUNKEN 037 046 086

087

TELERENT 072

TERA 172

TMK 004 116

TOSHIBA 007 015 030

040 051 062

101 138

TOTEVISION 143

UNIVERSAL 008 009

VIDEO CONCEPTS 146

VIDIKRON 174

VIDTECH 004 116

WARDS 004 008 009

019 028 060

061 063 064

072 074 116

143 164

YAMAHA 004 006

YORK 004 116

YUPITERU 043

ZENITH 001 072 073

095 103 157

ZONDA 112

REMOTE CODES

D52WLCD 12 OVERVIEW

REMOTE CONTROL

VCRs

Brand Codes

AIWA 034

AKAI 016 043 046

124 125 146

AMPRO 072

ANAM 031 033 103

AUDIO DYNAMICS 012 023 039

043

BROKSONIC 035 037 129

CANON 028 031 033

CAPEHART 108

CRAIG 003 040 135

CURTIS MATHES 031 033 041

DAEWOO 005 007 010

064 065 108

110 111 112

116 117 119

DAYTRON 108

DBX 012 023 039

043

DYNATECH 034 053

ELECTROHOME 059

EMERSON 006 017 025

027 029 031

034 035 036

037 046 101

129 131 138

153

FISHER 003 008 009

010

FUNAI 034

GE 031 033 063

072 107 109

144 147

GO VIDEO 132 136

GOLDSTAR 012 013 020

101 106 114

123

HARMAN KARDON 012 045

HITACHI 004 018 026

034 043 063

137 150

INSTANTREPLAY 031 033

JCL 031 033

JCPENNY 012 013 015

033 040 066

101

JENSEN 043

JVC 012 031 033

043 048 050

Brand Codes

055 060 130

150 152

KENWOOD 014 034 039

043 047 048

LG 255

LLOYD 034

LXI 003 009 013

014 017 034

101 106

MAGIN 040

MAGNAVOX 031 033 034

041 067 068

MARANTZ 012 031 033

067 069

MARTA 101

MATSUI 027 030

MEI 031 033

MEMOREX 003 010 014

031 033 034

053 072 101

102 134 139

MGA 045 046 059

MINOLTA 013 020

MITSUBISHI 013 020 045

046 049 051

059 061 151

MTC 034 040

MULTITECH 024 034

NEC 012 023 039

043 048

NORDMENDE 043

OPTONICA 053 054

PANASONIC 066 070 074

083 133 140

145

PENTAX 013 020 031

033 063

PHILCO 031 034 067

PHILIPS 031 033 034

054 067 071

101

PILOT 101

PIONEER 013 021 048

PORTLAND 108

PULSAR 072

QUARTZ 011 014

QUASAR 033 066 075

145

RCA 013 020 033

Brand Codes

034 040 041

062 063 107

109 140 144

145 147

REALISTIC 003 008 010

014 031 033

034 040 053

054 101

RICO 058

RUNCO 148

SALORA 014

SAMSUNG 032 040 102

104 105 107

109 112 113

115 120 122

125

SANSUI 022 043 048

135

SANYO 003 007 010

014 102 134

SCOTT 017 037 112

129 131

SEARS 003 008 009

010 013 014

017 020 031

042 073 081

101

SHARP 031 054 149

SHINTOM 024

SONY 003 009 031

052 056 057

058 076 077

078 149

SOUNDESIGN 034

STS 013

SYLVANIA 031 033 034

059 067

SYMPHONIC 034

TANDY 010 034

TATUNG 039 043

TEAC 034 039 043

TECHNICS 031 033 070

TEKNIKA 019 031 033

034 101

THOMAS 034

TMK 006

TOSHIBA 008 013 042

047 059 082

112 131

Brands Codes

TOTEVISION 040 101

UNITECH 040

VECTOR RESEARCH 012

VICTOR 048

VIDEO CONCEPTS 012 034 046

VIDEOSONIC 040

WARDS 003 013 017

024 031 033

034 040 053

054 131

YAMAHA 012 034 039

043

ZENITH 001 034 048

056 058 072

080 101

D52WLCD 13 OVERVIEW

REMOTE CONTROL

SAT

DVD

Brand Codes

ALPHASTAR DSR 123

AMPLICA 050

BIRDVIEW 051 126 129

BSR 053

CAPETRONICS 053

CHANNEL MASTER 013 014 015

018 036 055

CHAPARRAL 008 009 012

077

CITOH 054

CURTIS MATHES 050 145

DRAKE 005 006 007

010 011 052

112 116 141

DX ANTENNA 024 046 056

076

ECHOSTAR 038 040 057

058 093 094

095 096 097

098 099 100

122

ELECTRO HOME 089

EUROPLUS 114

FUJITSU 017 021 022

Brand Codes

027 133 134

GENERAL INSTRUMENT

003 004 016

029 031 059

101

HITACHI 139 140

HOUSTON TRACKER 033 037 039

051 057 104

HUGHES 068

HYTEK 053

JANIEL 060 147

JERROLD 061

KATHREIN 108

LEGEND 057

LG 255

LUTRON 132

LUXOR 062 144

MACOM 010 059 063

064 065

MEMOREX 057

NEXTWAVE 028 124 125

NORSAT 069 070

PACE SKY SATELLITE 143

PANASONIC 060 142

PANSAT 121

Brand Codes

PERSONAL CABLE 117

PHILIPS 071

PICO 105

PRESIDENT 019 102

PRIMESTAR 030 110 111

PROSAT 072

RCA 066 106

REALISTIC 043 074

SAMSUNG 123

SATELLITE SERVICE

CO028 035 047

057 085

SCIENTIFIC ATLANTA 032 138

SONY 103

STARCAST 041

SUPER GUIDE 020 124 125

TEECOM 023 026 075

087 088 090

107 130 137

TOSHIBA 002 127

UNIDEN 016 025 042

043 044 045

048 049 078

079 080 086

101 135 136

Brand Codes

VIEWSTAR 115

WINEGARD 128 146

ZENITH 001 081 082

083 084 091

120

Brand Codes

APEX DIGITAL 022

DENON 020 014

GE 005 006

GOLDSTAR 010 016 025

HARMAN KARDON 027

JVC 012

LG 001 010 016

Brand Codes

025

MAGNAVOX 013

MARANTZ 024

MITSUBISHI 002

NAD 023

ONKYO 008 017

PANASONIC 003 009

Brand Codes

PHILIPS 013

PIONEER 004 026

PROCEED 021

PROSCAN 005 006

RCA 005 006

SAMSUNG 011 015

SONY 007

Brand Codes

THOMPSON 005 006

TOSHIBA 019 008

YAMAHA 009 018

ZENITH 010 016 025

D52WLCD 14 OVERVIEW

REMOTE CONTROL

CATV

Brand Codes

ABC 003 004 039

042 046 052

053

ANTRONIK 014

ARCHER 005 007 014

024

CABLE STAR 026

CENTURION 092

CENTURY 007

CITIZEN 007

COLOUR VOICE 065 090

COMBANO 080 081

COMTRONICS 019 030

DIAMOND 023

EAGLE 020 030 040

EASTERN 057 062 066

ELECTRICORD 032

GE 072

GEMINI 008 022 025

054

GI 052 074

GOLDEN CHANNEL 030

HAMLIN 049 050 055

HITACHI 052 055

HOSPITALITY 070 077

JERROLD 002 003 004

Brand Codes

008 009 010

052 069 074

LG 255

M-NET 037

MACOM 033

MAGNAVOX 010 012 064

079

MEMOREX 001

MOVIE TIME 028 032

NSC 015 028 038

071 073

OAK 016 031 037

053

PANASONIC 044 047

PARAGON 001

PHILIPS 006 012 013

020 065 085

090

PIONEER 034 051 052

063 076

POST NEWS WEEK 016

PRUCER 059

PTS 011 048 071

072 073 074

PULSAR 001

RCA 047

Brand Codes

REGAL 049 050

REGENCY 057

REMBRANT 025

RK 091

SAMSUNG 030 068

SCIENTIFIC ATLANTA 003 011 041

042 043 045

046

SHERITECH 022

SIGNAL 030

SIGNATURE 052

SL MARX 030

SPRUCER 047 078

STARCOM 002 004 008

009

STARGATE 008 030

SYLVANIA 067

TADIRAN 030

TANDY 017

TEXSCAN 029 067

TOCOM 039 040 056

TOSHIBA 001

UNIKA 007 014 024

UNITED CABLE 004 053

UNIVERSAL 005 007 014

024 026 027

Brand Codes

032 035

VIEWSTAR 012 015 018

086 087 088

089

ZENITH 001 060 093

D52WLCD 15 OVERVIEW

THEORY

Video is generated using an LCD Optical Engine. Light from a high intensity light is split into red, green, and blue

which passes through LCDs before being joined back together with a prism.

1st Illumination

Lens

PBS Array

2nd Fly-eye

Lens

1st Fly-eye

Lens

Lamp

Mirror 4

Blue Reflection

Mirror 3

Di

c

hr

o

i

c

Bl

ue

Tr

a

n

s

mi

ss

i

o

n

Blue

C-Lens

1

LCD (Red)

Dichroic Red Lens

(DRL 60)

Mirror 2

Red Reflection

Mirror 1

Dichroic Red Reflection

Blue C-Lens 2

Blue Polarizer (BP 60)

Dichroic Green Lens

(DGL 60)

LCD (Green)

LCD (Blue)

Mirror 5

Blue Reflection

P

ro

j

ect

i

on

L

ens

Dichroic Prism

OPTICS ENGINE

D52WLCD 16 OVERVIEW

THEORY

Dichroic mirrors are used to separate the light into red, green, and blue. A Dichroic mirror allows a certain wavelength

of light to pass through while refecting another.

Dichroic Red Reflection: Reflects red light and allows all other colors to pass through.

Dichroic Blue Transmission: Allows blue light to pass through and reflects others.

P

Unpolarized

Light

S-Polarizer

50%

100%

S

Unpolarized

Light

P

R

otato

r

PBS: Polarizing Beam Splitter.

Improves the light’s efficiency by

about 1.8 times. Transmits P-wave ,

Reflects S-wave.

Rotator (l/2 Plate): Changes P-wave to S-

wave.

Blue

Cyan

Green

Dichroic Blue Transmission

Cyan

White

Red

Dichroic Red Reflection

P-Polarizer

S-Polarizer

R

otator

FEL: Fly-Eye Lens. Focuses the light and

improves its efficiency and uniformity.

D52WLCD 17 OVERVIEW

THEORY

The three light beams pass through Condensing Lenses (C-Lens) which focus the light to match the size of the LCD panel.

Then the three light beams are joined together to form white light, which is then projected to the viewing screen.

RED

G

REEN

BLUE

WHITE

Dichroic Prism

C

-Lens

LCD Pane

l

WITHOUT C-LENS

WITH C-LENS

Condensing Lens: (C-Lens) focuses the light to match the size of the LCD panel.

Dichroic Prism: The prism consists of two Dichroic Mirrors. One reflects red light forward and the other reflects blue light

forward. Both allow green light to pass through. Once the light is joined, it is projected onto the viewing screen.

Hard Coat

Anti-Static

Black Stripe

Lenticular Len

s

Diffusion Plate

F

RESNEL

L

ENS

L

ENTICULAR

S

CREEN

Fresnel Lens: Mylar screen that condenses/focuses

the light from projection lens.

Lenticular Lens: Focuses the light through the

openings in the Black Stripe layer.

Black Stripe: Improves contrast by blocking outside

light.

Diffusion Plate: Improves viewing angle by diffusing

the light.

Hard Coat: Protects the screen surface and helps

improve contrast.

D52WLCD 18 OVERVIEW

THEORY

LIQUID CRYSTALS

Matter has three distinct states; solid, liquid, and gas

(and what some consider a fourth state beyond gas,

plasma). However, there are states of matter that may

fall between these states. Liquid crystals fall between a

liquid and a solid. Basically they are crystals that hold

their orientation (shape) but can flow similar to liquids.

Their molecules point in the same direction with respect

to each other like in a solid, but they are free to change

position like a liquid. Think of a handful of pencils. They

all point the same direction and hold their shape at

rest, but (collectively) change shape when you squeeze

or let go of them.

There are different phases and types of liquid crystals

that perform differently. Small amounts of pressure, heat,

and/or electricity can cause liquid crystals to change in

some way. Therefore liquid crystals are used in many

different ways, not just for displays. Other uses are

thermometers, window coatings, soap, etc. The types

of liquid crystals used in LCDs are called Twisted Nematics.

As the name implies, they are twisted. By applying an

electrical current to them they will untwist.

TFT Element

Pixel Electrode

(Transparent)

Insulator

Semi-conductor

Source

Gate

Drain

Glass Panel

Data Line

Gate Line

Pixel Electrode

Liquid Crystal

Common Electrode

Color Filter

Polarizer

Transistor

LIQUID CRYSTAL PANEL

Below is an exploded view of the Liquid Crystal Panel.

The key to an LCD's operation is the polarizers. The

polarizers only allow a certain wavelength of light to

pass through. The two polarizers are mounted at a 90

degree angle with respect to each other, which prevents

light from passing through. The liquid crystals are used

to twist the light beam 90 degrees and allow light to

pass through that pixel.

Each sub-pixel or cell (a red, green, and blue sub-pixel

equals one pixel) is controlled by a Thin Film Transistor

(TFT). This provides accurate control of each cell and

makes for an accurate picture. Some methods used in

the past that didn't involve a switch and current could

leak to surrounding cells resulting in a blurred image.

LIQUID CRYSTAL PANEL CROSS-SECTION

THIN FILM TRANSISITOR

D52WLCD 19 OVERVIEW

THEORY

TERMINOLOGY

This section explains some of the terminology used with LCD RPTVs. Viewing angle, IPS (In-Plane Switching), Tuning

Standards, Peak Brightness, Contrast Ratio, Response Time, and DVI (Digital Video Interface).

VIEWING ANGLE

Viewing angle is the angle at which the display’s brightness begins to noticeably diminish. Viewing on the LCD RPTVs

is limited due to the Viewing Screen (see page 21).

IPS (IN-PLANE SWITCHING)

In-Plane Switching provides more control over

the Liquid Crystals in an LCD. It uses an electric

field to line up the Liquid Crystals in an arc

formation. This directs light out at angles which

improves the viewing angle.

PEAK BRIGHTNESS

Peak brightness is the maximum amount of brightness that a display can produce. It is often measured in candella per

square meter (cd/m2). The D60WLCD is rated at 680 cd/m

2

CONTRAST RATIO

Contrast Ratio is the ratio of a display’s

brightest white to its darkest black. One of the

limitations of LCDs has been contrast ratio. The

D60WLCD features a 200:1 contrast ratio.

Liquid Crystal

Electrode

Conventional TFT-LCD IPS Mode TFT-LCD

RESPONSE TIME

The speed at which the pixels can react or change. Slower response times can cause fast moving video to “ghost” or

distort because the scene changes faster than the LCD can display the video (especially with video games). The

response time of new LCDs isn't a factor for most uses, but older models can display noticeable ghosting due to slower

response times.

D52WLCD 20 CIRCUITS

CIRCUIT DESCRIPTIONS

1. Main Part

1.1 CXA2069Q : Audio/Video Switch

(1) Description

The CXA2069Q is a 7-input, 3-output audio/video switch fea-

turing I 2 C bus compatibility for TVs. This IC has input pins

that are compatible with S2 protocol.

(2) Features

• 4 inputs that are compatible with S2 protocol

• Serial control with I 2 C bus

• 7 inputs, 3 outputs

• The desired inputs can be selected independently for each

of the 3 outputs

• Wide band video amplifier (20 MHz, –3 dB)

• Y/C MIX circuit

• Slave address can be changed (90H/92H)

• Audio muting from external pin

• High impedance maintained by I 2 C bus lines (SDA, SCL)

even when power is OFF

• Wide audio dynamic range (3 Vrms typ.)

(3) Description of Operation

The CXA2069Q is a TV I 2 C bus-compatible AV switch IC.

The video system and the stereo audio system

both have 7 inputs and 3 outputs each. 4 of the 7 video sys-

tem inputs support S2 and S protocols.

The desired inputs can be independently assigned to each

output (in the audio system, the left and right

channels are processed as one unit) by I 2 C bus control.

However, the same input is assigned to both the

video and audio system output 3.

CIRCUIT DESCRIPTIONS

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