Zenith D52WLCD, D52WLCD4 Service Manual
SERVICE MANUAL
Model Series:
Product Type: Rear Projection LCD
Chassis: 094A
Manual Part #: 923-03485R1
Manual Series: PV154
Model Line: E
Product Year: 2002
REVISED EDITION
First revison - Training material added
CONTENTS
General Info ................................................. 1
Service Menu ................................................ 2
Servicing ..................................................... 3
Parts List ..................................................... 4
Diagrams ...................................................... 5
Schematics ................................................... 6
D52WLCD
D52WLCD4
Printed in U.S.A.
Published July 2003
by Technical Publications
LG Electronics of Alabama, Inc.
201 James Record Road
Huntsville, Alabama 35824-1513
Copyright © 2003 LG Electronics Corporation
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS
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 transported 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 components, 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 equipment 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 equipment 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 equipment 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 SAFETY
i
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 3 OVERVIEW
OVERVIEW
OVERVIEW
SPECIFICATIONS
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
Audio (In) 6 500 mVrms (100% modulation), Impedance: 47 kilohms
Center Mode (In) 1
C: 0.280 Vp-p (burst signal), 75 ohms
Audio out 1
1 More than 408 mVrms (fix)
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
More than 408 mVrms at the maximum volume setting (variable)
Impedance (output): 2 kohms
Supplied accessories Remote control, batteries 2 size AA (Alkaline battery)
Screen Aspect Ratio 16 x 9
LCD Panel Size 0.87 inch
D52WLCD 5 OVERVIEW
OVERVIEW
FUNCTION 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
Operation Indicator
Lamp 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
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.
Temperature Indicator
Projection lamp is reaching the end of its life and needs to
be replaced with a new lamp.
D52WLCD 6 OVERVIEW
OVERVIEW
10
AM 03:00
Ch. 13
MONO
Ch.6
On-Screen Displays
This page describes your on-screen display and information banner options.
Main Channel Display
Displays current channel number.
Channel Label
If a channel label has been
set, then it will appear here.
Mute
Appears
when sound
is muted.
Volume
Volume level is displayed while
adjusting the sound.
ABC
PIP Display
This display
appears when
PIP is active.
Time
Appears when
pressing the
enter button on
remote control.
D52WLCD 7 OVERVIEW
Front Panel Controls
power menu enter vol ch
OVERVIEW
1
2
3
4
5
6
7
8
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.
D52WLCD 8 OVERVIEW
1
3
4
5
2
6
8
7
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 f f
exit
flashbk surf
freeze
vol
ch
ratio
comp2
skip
source
enter
REMOTE CONTROL DESCRIPTIONS
Remote Control Functions in TV Mode
REMOTE CONTROL
Selects the remote operating
mode: TV, VCR, Cable, DVD
and Satellite. Select other oper-
ating modes, for the remote to
Selects the analog TV signal.
Toggles between Video 1 and
Allows you to navigate the on-
screen menus and to adjust the
system settings and preferences,
by moving to an option with
and selecting the highlighted
option with . If is pressed while
you are in normal viewing, the
information banner is displayed.
MODE
control external devices.
ANTENNA
Video 2 input sources.
VIDEO
MUTE
Switch the sound on or off
PIPCH-
Changes to next lower PIP
channel
SWAP
Swap the signal from
your PIP window to
the main screen.
THUMBSTICK
Not functional
D
F G
E
INDICATOR LIGHTS
Show active remote mode
every time any button is
pressed.
LIGHT
Illuminates the remote control keys.
FRONT
Selects the front video signal if a device, such as a
camcorder or game player,
is connected to the front
video input jack.
RATIO
Changes the screen format
or aspect ratio.
PIPCH+
Changes to next higher PIP
channel.
PIP
Toggles between PIP, POP
(Picture-out-of-Picture) and
Split screen.
SURF
Scrolls the Surf channel
list.
EXIT
Clears all on-screen displays and returns to TV
viewing from any menu.
D52WLCD 9 OVERVIEW
REMOTE CONTROL
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 f f
exit
flashbk surf
freeze
vol
ch
ratio
comp2
skip
source
enter
Remote Control Functions in TV Mode
Selects component signal sources,
Use to enter a program number for
COMPONENT 1, 2
such as DVD or HD receiver.
NUMBER KEYPAD
For direct channel selection and
programming functions.
“DASH” BUTTON
multiple program channels.
VOLUME UP/DOWN
Increases/decreases the sound
level.
MENU
Brings up the main menu
to the screen.
POWER
Turns your TV or any other
programmed equipment on
or off, depending on mode.
RGB
Selects PC or RGB input
sources.
ENTER
When in the menu system
and other on-screen displays,
selects highlighted options.
CHANNEL UP/DOWN
Scrolls through available
channels in EZ Scan memory.
FLASHBK
Tunes to the last channel
viewed.
FREEZE
Captures and freezes the
currently-viewed screen in
PIP.
RECORD, PAUSE, REW,
FFWD, PLAY, STOP
Control the functions on your VCR.
D52WLCD 10 OVERVIEW
ENTER
When in the menu system
and other on-screen displays, selects high lighted
options.
SKIP
Functions as a song selector in audio mode and a
movie chapter selector in
aux/DVD mode.
REMOTE CODES
TVs
REMOTE CONTROL
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
D52WLCD 11 OVERVIEW
VCRs
REMOTE CONTROL
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 12 OVERVIEW
SAT
REMOTE CONTROL
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
GENERAL INSTRUMENT
HITACHI 139 140
HOUSTON TRACKER 033 037 039
HUGHES 068
HYTEK 053
JANIEL 060 147
JERROLD 061
KATHREIN 108
LEGEND 057
LG 255
LUTRON 132
LUXOR 062 144
MACOM 010 059 063
MEMOREX 057
NEXTWAVE 028 124 125
NORSAT 069 070
PACE SKY SATELLITE 143
PANASONIC 060 142
PANSAT 121
027 133 134
003 004 016
029 031 059
101
051 057 104
064 065
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
SCIENTIFIC ATLANTA 032 138
SONY 103
STARCAST 041
SUPER GUIDE 020 124 125
TEECOM 023 026 075
TOSHIBA 002 127
UNIDEN 016 025 042
CO028 035 047
057 085
087 088 090
107 130 137
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
DVD
Brand Codes
APEX DIGITAL 022
DENON 020 014
GE 005 006
GOLDSTAR 010 016 025
HARMAN KARDON 027
JVC 012
LG 001 010 016
D52WLCD 13 OVERVIEW
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
CATV
REMOTE CONTROL
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 14 OVERVIEW
THEORY
chroic
1
Proj
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.
OPTICS ENGINE
2nd Fly-eye
Lens
1st Fly-eye
Lens
Lamp
1st Illumination
PBS Array
Lens
Dichroic Prism
LCD (Red)
Dichroic Red Lens
(DRL 60)
Mirror 2
Red Reflection
Mirror 1
Dichroic Red Reflection
LCD (Green)
Dichroic Green Lens
(DGL 60)
Blue Transmission
Di
ectionLens
LCD (Blue)
Blue Polarizer (BP 60)
Blue C-Lens 2
Mirror 5
Blue Reflection
Blue
C-Lens
Mirror 4
Blue Reflection
Mirror 3
D52WLCD 15 OVERVIEW
THEORY
R
r
R
100%
Unpolarized
Light
100%
Unpolarized
Light
FEL: Fly-Eye Lens. Focuses the light and
improves its efficiency and uniformity.
Red
otato
50%
P
S
P
S
S-Polarizer
50%
S-Polarizer
50%
S-Polarizer
50%
S-Polarizer
S
S
Rotator (l/2 Plate): Changes P-wave to Swave.
P-Polarizer
PBS: Polarizing Beam Splitter.
Improves the light’s efficiency by
about 1.8 times. Transmits P-wave ,
Reflects S-wave.
otator
S-Polarizer
Green
White
Dichroic Red Reflection
Cyan
Cyan
Blue
Dichroic Blue Transmission
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.
D52WLCD 16 OVERVIEW
THEORY
G
C
l
s
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.
WITHOUT C-LENS
WITH C-LENS
LCD Pane
-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.
BLUE
WHITE
Dichroic Prism
REEN
RED
Black Stripe
Diffusion Plate
Hard Coat
Anti-Static
L
ENTICULAR
S
CREEN
Lenticular Len
RESNEL
F
L
ENS
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 17 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.
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.
TFT Element
Polari zer
Color Filter
Transistor
Gate Line
Data Line
Pixel Electrode
Common Electrode
Liquid Crystal
Polari zer
LIQUID CRYSTAL PANEL CROSS-SECTION
D52WLCD 18 OVERVIEW
Pixel Electrode
(Transparent)
Source
Semi-conductor
Insulator
THIN FILM TRANSISITOR
Gate
Glass Panel
Drain
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.
Conventional TFT-LCD IPS Mode TFT-LCD
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
Liquid Crystal
Electrode
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.
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 19 OVERVIEW
CIRCUIT DESCRIPTIONS
1. Main Part
CIRCUIT DESCRIPTIONS
1.1 CXA2069Q :
Audio/Video Switch
(1) Description
The CXA2069Q is a 7-input, 3-output audio/video switch featuring 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 system 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.
D52WLCD 20 CIRCUITS
(4) Block Diagram
CIRCUIT DESCRIPTIONS
D52WLCD 21 CIRCUITS
CIRCUIT DESCRIPTIONS
1.2 CXA2151Q :
Video/Sync Selector
(1) Description
The CXA2151Q is a bipolar IC developed for multi scan TVs,
and incorporates a four system video switch (including HV
sync signal processing) and a YCbCr output matrix circuit.
(2) Features
• Supports the I2C bus
• Supports multi scan
• Four system video switch (of which two systems support D3
pins)
• Matrix circuit
• Each YCbCr output can be switched between 0dB, 6dB
(gain adjustable) and mute.
• Sync signal automatic identification circuit (with fixed mode)
• Sync separation circuit (supports HD)
• HD Tri-level sync identification circuit
• Sync signal frequency counter (both H and V)
• Dummy sync output
(3) Description of Operation
1) Programmable Matrix Selector
The CXA2151Q has a built-in four system video switch,
which can be selected by INPUT_SEL (I
YCbCr, HD YPbPr, GBR and the respective HV sync signals can be input to each system.
Horizontal scanning line frequencies from 15 to 45kHz can
be input as the range which supports multi scan.
The selected signals are output from SEL_OUT (Pins 22,
23, 25, 26 and 27), respectively. The output amplitude at
this time can be selected by GAIN_SEL (I
when GAIN_SEL is set to 0, the gain can be adjusted by
YGAIN, CBGAIN and CRGAIN (I
HV sync signal input supports both positive and negative
polarity.
Select MAT_OUT (I
2
C bus) as follows according to the input.
• Select THROUGH mode during YCbCr input.
• When YPbPr or GBR are input, select the mode that converts these signals to YCbCr.
The matrix conversion formulas are shown below.
[MAT_OUT = 1: Y
HD
PbPr $ YCbCr]: CCIR protocol
Y = YHD + 0.094Pb + 0.196Pr
Cb = 0.564 (1.762Pb – 0.196Pr)
Cr = 0.713 (–0.094Pb + 1.379Pr)
[MAT_OUT = 2: Y
HD
PbPr $ YCbCr]: BTA protocol
Y = YHD + 0.068Pb + 0.191Pr
Cb = 0.564 (1.758Pb – 0.191Pr)
Cr = 0.713 (–0.068Pb + 1.385Pr)
[MAT_OUT = 3: GBR $ YCbCr]
Y = 0.3R + 0.59G + 0.11B
Cb = 0.564 (–0.3R – 0.59G + 0.89B)
Cr = 0.713 (0.7R – 0.59G – 0.11B)
2
C bus).
2
C bus).
2
Cbus), but
In addition, the IN1 and IN2 systems support D3 input pins.
This is selected by SELSTB_1 and SELSTB_2 (I
2
C bus).
The control line input voltage of each L1, L2, L3 and SW pin
is returned to the status register by a ternary or binary value.
Next, the HV sync signal processing block is described
below.
Existence distinction is first performed to determine whether
the selected sync signals are input from H and V, and these
results are sent as the existence status to the EV and EH
status registers. On the other hand, polarity-matched H and V
that passed through the polarity identification circuit are input
to the priority ranking circuit.
When inputting composite sync (CS), input to the H input pin
of each input system. After passing through the polarity identification circuit, V sync separation is performed and the signal is input to the priority ranking circuit.
When inputting Sync on Y or Sync on Green, input to the
number 3 pin of each input system.
After passing through HYSW, the signal is amplified by 6dB
and output to YG_OUT (Pin 15). This output is returned to
YG_IN (Pin 16) via a sync tip clamping capacitor, sync separation is performed, and the signal is input to the priority ranking circuit. This route can also be used during CS signal input
by setting HYSW (I
2
C bus) to 1.
In addition, sync identification is performed to determine
whether the input signal from YG_IN (Pin 16) is Tri-level
sync, and these results are returned to the 3STATE status
register.
In this manner, the respective signals are input to the priority
ranking circuit, and the output sync signal is determined by
the EV and EH status.
The priority ranking is as follows. The TV set should be
designed so that one of the following three points is met.
1. When both H and V exist at the H and V pins, these sig-
nals are selected with the highest priority.
$ EH = 1, EV = 1
2. When CS exists at the H pin and there is no input at the V
pin, CS is selected.
$ EH = 1, EV = 0
3. When Y or GREEN exists at the number 3 pin and there is
no input at the H and V pins, Y or GREEN is selected.
$ EH = 0, EV = 0
After the HV output is determined, the H sync signal pulse
width is adjusted by H_WIDTH (I
2
C bus), and then
the H sync signal is output together with the V sync signal to
SEL_OUT.
2) SYNC Counter
The H and V sync signals selected by the HV sync signal
processing block described previously are sent to the SYNC
counter block next.
The SYNC counter block counts the frequency of the input H
and V sync signals.
D52WLCD 22 CIRCUITS
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