SHARP LC20D42U Service Manual

LC-20D42U

N27A9LC20D42U

LCD COLOR TELEVISION

MODEL

In the interests of user-safety (Required by safety regulations in some countries) the set should be restored
to its original condition and only parts identical to those specified should be used.

LC-20D42U

CONTENTS

Page

» IMPORTANT SERVICE SAFETY PRECAUTION.........................................................................................2

» SPECIFICATIONS ........................................................................................................................................5

» OPERATION MANUAL .................................................................................................................................6

» DIMENSIONS ...............................................................................................................................................9

» REMOVING OF MAJOR PARTS ................................................................................................................10

» ADJUSTING PROCEDURE OF EACH SECTION .....................................................................................15

» PUBLIC MODE SETTING PROCEDURE ..................................................................................................26

» TROUBLESHOOTING TABLE ....................................................................................................................31

» MAJOR IC INFORMATIONS ......................................................................................................................42

» BLOCK DIAGRAM ......................................................................................................................................44

» OVERALL WIRING DIAGRAM ................................................................................................................... 46

» DESCRIPTION OF SCHEMATIC DIAGRAM ............................................................................................. 48

» SCHEMATIC DIAGRAM

ËLED Unit...................................................................................................................................................49

ËMAIN Unit.................................................................................................................................................50

ËKEYUnit ...................................................................................................................................................90

» PRINTED WIRING BOARD ASSEMBLIES ................................................................................................92

» REPLACEMENT PARTS LIST .................................................................................................................. 104

» PA CKING OF THE SET ............................................................................................................................119

This document has been published to be used for
after sales service only.
The contents are subject to change without notice.

LC-20D42U

SAFETY PRECAUTION

IMPORTANT SERVICE SAFETY PRECAUTION

Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the
servicing guidelines which follow:

WARNING

1. For continued safety, no modification of any circuit should be
attempted.

2. Disconnect AC power before servicing.

CAUTION:FOR CONTINUED
PROTECTION AGAINST A RISK OF
FIRE REPLACE ONLY WITH SAME
TYPE FUSE.

AV

F1(250V 3.15A), F101(125V 5A)

•Use an AC voltmeter having with 5000 ohm per volt, or higher, sen­sitivity or measure the AC voltage drop across the resistor.

•Connect the resistor connection to all exposed metal parts having a
return to the chassis (antenna, metal cabinet, screw heads, knobs
and control shafts, escutcheon, etc.) and measure the AC voltage
drop across the resistor.

All checks must be repeated with the AC cord plug connection
reversed. (If necessary, a nonpolarized adaptor plug must be used
only for the purpose of completing these checks.)

Any reading of 0.75 Vrms (this corresponds to 0.5 mA rms AC.) or
more is excessive and indicates a potential shock hazard which
must be corrected before returning the monitor to the owner.

DVM

BEFORE RETURNING THE RECEIVER (Fire &

Shock Hazard)

Before returning the receiver to the user, perform the following
safety checks:

3. Inspect all lead dress to make certain that leads are not pinched,
and check that hardware is not lodged between the chassis and
other metal parts in the receiver.

4. Inspect all protective devices such as non-metallic control knobs,
insulation materials, cabinet backs, adjustment and compartment
covers or shields, isolation resistor-capacitor networks, mechanical
insulators, etc.

5. To be sure that no shock hazard exists, check for leakage current in
the following manner.

•Plug the AC cord directly into a 120 volt AC outlet.

•Using two clip leads, connect a 1.5k ohm, 10 watt resistor paral­leled by a 0.15 F capacitor in series with all exposed metal cabinet
parts and a known earth ground, such as electrical conduit or elec­trical ground connected to an earth ground.

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

µ

TO EXPOSED
METAL PARTS

AC SCALE

1.5k ohm
10W

0.15µF

TEST PROBE

CONNECT TO
KNOWN EARTH
GROUND

SAFETY NOTICE

Many electrical and mechanical parts in LCD color television have
special safety-related characteristics.

These characteristics are often not evident from visual inspection, nor
can protection afforded by them be necessarily increased by using
replacement components rated for higher voltage, wattage, etc.

Replacement parts which have these special safety characteristics are
identified in this manual; electrical components having such features

Par

ts

are identified by " " and shaded areas in the Replacement
and Schematic Diagrams.

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Lists

For continued protection, replacement parts must be identical to those
used in the original circuit.

The use of a substitute replacement parts which do not have the same
safety characteristics as the factory recommended replacement parts
shown in this service manual, may create shock, fire or other hazards.

2

PRECAUTIONS A PRENDRE LORS DE LA REPARATION

s
s

-

Ne peut effectuer la réparation qu' un technicien spécialisé qui s'est parfaitement accoutumé à toute vérification de sécurité et aux
conseils suivants.

Al'aide de deux fils à pinces, brancher une résistance de 1.5 k

AVERTISSEMENT

1.

N'entreprendre Aaucunemodification de tout circuit. C'est danger­eux.

2.

Débrancher le récepteur avant toute réparation.

PRECAUTION: POUR LA PRO­TECTION CONTINUE CONTRE
LES RISQUES D'INCENDIE, RE­MPLACER LE FUSIBLE

AV

F1(250V 3.15A), F101 (125 5A)

VERIFICATIONS CONTRE L'INCEN-DIE ET LE
CHOC ELECTRIQUE

Avant de rendre le récepteur à l'utilisateur , effectuer les vérifica­tions suivantes.

3.

Inspecter tous les faisceaux de câbles pour s'assurer que les fils
ne soient pas pincés ou qu'un outil ne soit pas placé entre le châs­sis et les autres pièces métalliques du récepteur.

4.

Inspecter tous les dispositifs de protection comme les boutons de
commande non-métalliques, les isolants, le dos du coffret, les cou­vercles ou blindages de réglage et de compartiment, les réseaux
de résistancecapacité, les isolateurs mécaniques, etc.

S'assurer qu'il n'y ait pas de danger d'électrocution en vérifiant la

5.
fuite de courant, de la facon suivante:

Brancher le cordon d'alimentation directem-ent à une prise de cou­rant de 120V. (Ne pas utiliser de transformateur d'isolation pour
cet essai).

10 watts en parallèle avec un condensateur de 0.15µFensérie
avec toutes les pièces métalliques exposées du coffret et une terre
connue comme une conduite électrique ou une prise de terre
branchée à la terre.

Utiliser un voltmètre CA d'une sensibilité d'au moins 5000 /V pour
mesurer la chute de tension en travers de la résistance.

Toucher avec la sonde d'essai les pièces métalliques exposées qui
présentent une voie de retour au châssis (antenne, coffret métalli­que, tête des vis, arbres de commande et des boutons, écusson,
etc.) et mesurer la chute de tension CA en-travers de la résistance.
Toutes les vérifications doivent être refaites après avoir inversé la
fiche du cordon d'alimentation. (Si nécessaire, une prise
d'adpatation non polarisée peut être utilisée dans le but de termin­er ces vérifications.)
La tension de pointe mesurèe ne doit pas dépasser 0.75V (corre­spondante au courant CA de pointe de 0.5mA).
Dans le cas contraire, il y a une possibilité de choc électrique qui
doit être supprimée avant de rendre le récepteur au client.

DVM

ECHELLE CA

1.5k ohm
10W

µ

F

0.15

SONDE D'ESSAI

LC-20D42U

AUX PIECES
METALLIQUES
EXPOSEES

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

BRANCHER A UNE
TERRE CONNUE

AVIS POUR LA SECURITE

De nombreuses pièces, électriques et mécaniques, dans les télévi­seur ACL présentent des caractéristiques spéciales relatives à la sé­curité, qui ne sont souvent pas évidentes à vue. Le degré de protec­tion ne peut pas être nécessairement augmentée en utilisant des
pièces de remplacement étalonnées pour haute tension, puissance,
etc.
Les pièces de remplacement qui présentent ces caractéristiques sont
identifiées dans ce manuel; les pièces électriques qui présentent ces
particularités sont identifiées par la marque " " et hachurées dans la
liste des pièces de remplacement et les diagrammes schématiques.

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Pour assurer la protection, ces pièces doivent être identiques à celle
utilisées dans le circuit d'origine. L'utilisation de pièces qui n'ont pa
les mêmes caractéristiques que les pièces recommandées par l'usine,
indiquées dans ce manuel, peut provoquer des électrocutions, incen
dies, radiations X ou autres accidents.

3

LC-20D42U

Precautions for using lead-free solder

Employing lead-free solder

•“PWBs” of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and service manuals. The
alphabetical character following LF shows the type of lead-free solder.

Example:

Indicates lead-free solder of tin, silver and copper. Indicates lead-free solder of tin, silver and copper.

Using lead-free wire solder

•When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead wire solder may cause dam­age or accident due to cracks.

As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40
bit, if you are not familiar with how to obtain lead-free wire solder or soldering bit, contact our service station or service branch in your area.

Soldering

•As the melting point of lead-free solder (Sn-Ag-Cu) is about 220
solder wettability, you may be apt to keep the soldering bit in contact with the PWB for extended period of time. However, Since the land may be
peeled off or the maximum heat-resistance temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the
steady soldering condition.

Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn on and off the power of the bit as
required.

If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit after every use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.

°C which is higher than the conventional lead solder by 40 °C, and as it has poor

°C, we recommend you to use a dedicated soldering

•Be careful when replacing parts with polarity indication on the PWB silk.

Lead-free wire solder for servicing

PARTS CODE

ZHNDAi123250E BL J 0.3mm 250g (1roll)
ZHNDAi126500E BK J 0.6mm 500g (1roll)
ZHNDAi12801KE BM J 1.0mm 1kg (1roll)

PRICE
RANK

PART

DELIVERY

DESCRIPTION

φ
φ
φ

4

SPECIFICATIONS

LC-20D42U

Item

LCD panel

Number of dots
TV

Function

TV-standard (CCIR)
Receiving

Channel

Audio multiplex
Backlight

Audio out

Terminals

Rear

Front

Side

USB SOFT UPDATE (When service man and products USB is used only by update of program.

OSD language

Power Requirement
Power Consumption

Model

LC-20D42U

20"Advanced Super View & BLACK TFT LCD

×

3,147,264 dots (1366 768 3 dots)

×

American TV Standard ATSC/NTSC System
VHF/UHF
CATV
Digital Terretrial

Broadcast(8VSB)
Digital cable

(64/256 QAM)

VHF 2-13ch, UHF 14-69ch

1-135ch (non-scrambled channel only)

2-69ch

*1

1-135ch (non-scrambled channel only)

BTSC System

60,000 hours (at Backlight Standard position)

×

5W 2

INPUT 1
INPUT 2
INPUT 3

INPUT 4
INPUT 5

AV in, COMPONENT in

AV in

AV in, S-VIDEO in

HDMI in with HDCP

HDMI Analog Audio in, HDMI in with HDCP

INPUT 6 15 pin mini D-sub, PC Audio in (Ø 3.5 mm jack)

ANTENNA
DIGITAL AUDIO OUTPUT

75 Ω Unbalance, F Type 1 for Analog (VHF/UHF/CATV) and Digital (AIR/CABLE)

Optical Digital audio output 1 (PCM/Dolby Digital)

×

×

OUTPUT Audio out
MOBILE AUDIO

Mobile Audio in

The ordinary user never uses it. )

English/French/Spanish

AC 120 V, 60 Hz

69 W (0.3 W Standby with AC 120V)

Weight

w/o stand
with stand

Dimension
(W H D)

*2

×

×

w/o stand

with stand

Operating temperature

*1

Emergency alert messages via Cable are unreceivable.

*2

The dimensional drawings are shown on the inside back cover.

As part of policy of continuous improvement, SHARP reserves the right to make design and speci cation changes for product

*

15.8 lbs./12.0 kg

13.2 lbs./14.5 kg

35

20

/64 1545/64 855/64 inch

35

×

/64 1419/64 533/64 inch

20

+

32˚F to 104˚F (0˚C to 40˚C)

×

×

×

+

+

improvement without prior notice. The performance speci cation gures indicated are nominal values of production units.
There may be some deviations from these values in individual units.

5

LC-20D42U

Part names

TV (Front)

Remote

control
sensor

OPC

sensor*

*OPC: Optical Picture Control
**See page 16 for TV status indicator.

TV (Rear)

OPERATION MANUAL

MOBILE
AUDIO jack
OPC indicator*

POWER
indicator**

To change the vertical angle of the LCD TV set,
tilt thescreen up to 2.5 degrees forward or 10
degrees backwards.Please adjust the angle so that
the LCD TV set can be watched most comfortably.

SOFT UPDATE
The ordinary user never
uses it.

USB
terminal

AUDIO terminals (INPUT 5)
HDMI terminal (INPUT 5)

HDMI terminal (INPUT 4)

PC IN terminals (INPUT 6)

AUDIO OUTPUT terminals

DIGITAL AUDIO OUTPUT
terminal
Antenna/Cable in

Channel buttons

(CH / )

Volume
buttons

(VOL + / - )

INPUT button

MENU button

POWER button

INPUT 3 terminals
INPUT 2 terminals
INPUT 1 terminals

AC INPUT terminal

6

Part names

LC-20D42U

Remote control unit

1 POWER: Switch the TV power on or enters standby.
2 0 - 9: Set the channel.

3 (DOT):

»

+

4 VOL / : Set the volume.
5 DISPLAY: Display the channel and the clock

6 INPUT: Select a TV input source. (TV, INPUT 1,

7 VIEW MODE: Select the screen size.
8 FREEZE: Set the still image. Press again to return to

9 EXIT: Turn off the menu screen.
10 FAVORITE CH
A, B, C, D: Select 4 preset favorite channels in 4

While watching, you can toggle the selected channels

11 SLEEP: Set the sleep timer.
12 FAVORITE: Set the favorite channels.
13 AUDIO: Selects the MTS/SAP or the audio mode

14 ENT: Jumps to a channel after selecting with the 0 - 9

15 CH / : Select the channel.
16 MUTE: Mute the sound.

17 SURROUND: Select Surround settings.

18 FLASHBACK: Return to the previous channel or

external input mode.
MENU: Display the menu screen.

19

20 / / / /ENTER: Select a desired item on the

21 RETURN: Return to the previous menu screen.
22 CC: Display captions from a closed-caption source.

23 AV MODE: Select an audio or video setting.

-

information .

INPUT 2, INPUT 3, INPUT 4, INPUT 5, INPUT 6)

normal screen.

different categories.

by pressing A, B, C and D.

during multi-channel audio broadcasts.

buttons.

screen.

(When the input source is TV, INPUT 1, 2 or 3:
STANDARD, MOVIE, GAME, USER, DYNAMIC (Fixed),
DYNAMIC. When the input source is INPUT 4, 5 or 6:
STANDARD, MOVIE, GAME, PC, USER, DYNAMIC
(Fixed), DYNAMIC)

When using the remote control unit, point it at the TV.

7

LC-20D42U

Basic adjustment sitings

Menu items for TV/INPUT 1/2/3 Menu items for HDMI/PC-IN

OPC
Backlight
Contrast
Brightness
Color
Tint
Sharpness
Advanced

Color Temp.
Black
I/P Setting
Film Mode
3D-Y/C
Monochrome
Range of OPC

Treble
Bass
Balance
Surround

No Signal Off
No Operation Off

OPC
Backlight
Contrast
Brightness
Color
Tint
Sharpness
Advanced

Color Temp.
Black
I/P Setting
Film Mode
Monochrome
Range of OPC

Treble
Bass
Balance
Surround

No Signal Off
No Operation Off

EZ Setup
CH Setup
Antenna Setup-DIGITAL
Input Skip
Input Label
Parental CTRL
Position
Language
Clock Setup
Music Player Input
Reset

Audio Only
Digital Noise Reduction
Input Select
Output Select
Color System
Caption Setup
Program Title Display
Favorite CH
Wake-up Timer Setup

Audio Setup

Input Skip
Input Signal
Auto Sync.
Input Label
Fine Sync.
Position
Language
Clock Setup
Music Player Input
Reset

Audio Only
Digital Noise Reduction
HDMI Setup
Output Select
Wake-up Timer Setup

Some menu items may not be displayed depending on the

selected input source.

8

17

20

35

15

/32

/64

(522)

(443.6)

DIMENSIONS

12

LC-20D42U

33

/64

(318)

(36)

/64

27

1

(363)

/64

19

14

(249.4)

/16

13

9

(399)

/64

(234)

45

/32

7

15

9

23

2

(60)

/64

33

5

(140)

15

3

/16

(100)

(62)

/16

7

2

(100)

/16

15

3

/64

5

(92)

/8

3

55

(225)

/64

8

9

LC-20D42U

REMOVING OF MAJOR PARTS

1. Remove the lock screw and detach the Stand Cover.

2. Remove the 4 lock screw and detach the Stand Assy.

3. Remove the USB Cover.

4. Remove the 5 lock screws,4 lock screws,3 lock screws,1 lock screw and detach the Cabinet B.

Cabinet A

4

3

USB Cover

Stand Cover

1

Cabinet B

2

Stand Assy

10

5. Remove the 6 lock screws,3 lock screws and detach the Main Shield.

6. Remove the 2 lock screws and detach the Chassis Frame.

LC-20D42U

6

5

Main Shield

Chassis Frame

11

LC-20D42U

7. Disconnect all the connectors from all he PWBs.

8. Remove the 2 lock screws and detach Top Cover Assy.

9. Remove the 2 lock screws from the Top Cover Assy and detach the KEY Unit.

10.Remove the 4 lock screws and detach the Speaker Assy L&R.

11.Remove the 2 lock screws and detach the R/C LED Unit.

8

Top Cover Assy

KEY Unit

9

10

7

7

R/C LED Unit

11

Speaker Assy L&R

10

12

12. Remove the 5 lock screws and detach the POWER Unit.

13. Remove the 6 lock screws and detach the MAIN Unit.

14. Remove the 2 lock rivets and detach the Radiator.

15. Remove the 2 Earth Plate.

LC-20D42U

Earth Plate

13

15

14

Radiator

12

POWER Unit

MAIN Unit

13

LC-20D42U

16.Remove the 6 lock screws,5 lock screws and detach the Back Shield.

Back Shield

16

14

LC-20D42U

ADJUSTING PROCEDURE OF EACH SECTION

[1] ADJUSTMENT PROCEDURETME

The adjustment values are set to the optimum conditions at the factory before shipping. If a value should become improper or an adjustment is
required due to part replacement,make an adjustment according to the following procedure.

1. After replacement of any PWB unit and/or IC for repair,please note the following.

• When replacing the following units, make sure to prepare the new units loaded with updated software.

MAIN Unit:DUNKE001FMF1

2. Upgrading of each microprocessor software

Caution:Never "POWER OFF" the unit when software upgrade is on going.
Otherwise the system may be damaged beyond recovery.

2.1. Software version upgrade

The model employs the following software.

•

Main software

•Monitor microprocessor software.

The main software and the monitor microprocessor software can be upgraded by using a general-purpose USB Memory.

The followings are the procedures for upgrading,explained separately for each of the main software,the monitor microprocessor software.

2.2. Main software version upgrade

Get ready before you start

• USB Memory of 128MB or higher capacity.

• PC running on Windows 98/98SE/ME/2000/XP operating system.

• USB Memory reader/writer with USB connectivity.

Preparations

To upgrade the main software,it is necessary to get ready the USB Memory for version upgrade before you start.

Follow the steps below and create the USB Memory for version upgrade.

1. Copy the file 42LTAxxx.USB(named temporarily) for version upgrade to the root directory (folder) of the USB Momory.

NOTE:In the USB Memory drive, do not store other folders or unrelated files, or more than one files for version upgrade.

Now the USB Memory for version upgrade is ready.

How to upgrade the software

2.

Unplug the AC cord. (make sure AC power shut down more than 1 minute.)

3. Insert the USB Memory for version upgrade (prepared as above) into the service socket located Right side from center at terminals,above
HDMI4 terminal in the rear of the unit.

4. plug in the AC cord with power button pressing after 5 seconds later, unpress the power button.

5. After the unit startup,the system upgrade screen as shown below appears within 20-40 seconds.

100%

MOISE_LITE

MAIN

45%

MONITOR

NO DATA

SYSTEM UPGRADE

EEPROM

USB - MEMORY

DETECT

U0612111 OLD Version

NEW Version U0612201

Boot Version

D42U_LITE 0.80

15

LC-20D42U

6. Even a single failure in the process will trigger the upgrade failure screen as shown below.the word "NG" channges to red for the item failed.

NOTE: In the event of a failure, repeat the upgrading process.If the process repeatedly fails. it is likely that the hardware is troubled.

100%

100%

MOISE_LITE

MOISE_LITE

SYSTEM UPGRADE

MAIN

45%

MONITOR

NO DATA

NG

NEW Version U0612201

Boot Version

EEPROM

USB - MEMORY

DETECT

U0612111 OLD Version

D42U_LITE 0.80

7.Upon completion of the whole process,the upgrade success screen as shown below appears.You can check the new software version on this
screen. The version information appears after the upgrade is complete.

UPGRADE SUCCESS

MAIN

100%

MONITOR

NO DATA

EEPROM

USB - MEMORY

DETECT

U0612111 OLD Version

NEW Version U0612201

Boot Version

D42U_LITE 0.80

8.unplug the AC cord and remove the USB Memory for version upgrade.

9

.Now the software version upgrade is complete.

NOTE: When you are done with the software version upgrade,start the set,go to the top page of the adjustment process screen and check the main

software version information.

2.3. Monitor microprocessor software version upgrade

Create the USB memory for monitor microprocessor software version upgrade in the same manner as explained in the "Main software version upgrad".

Copy the file 42LTMxxx.USB and 42LTMxxx.BIN(named temorarily ) for monitor microprocessor software version upgrade to th USB memory.

How to upgrade the software

1. Unplug the AC cord.(make sure AC power shut down more than 1 minute.)

2. Insert the USB memory for version upgrade (prepared as above) into the service socket located Right side from center at terminals,above HDMI4
terminal in the rear of the unit.

3. plug in the AC cord with power button pressing.

4. After 5 seconds later,unpress the power botton.

CAUTION: The moment this operation is done,the upgrading of the monitor microprocessor software starts.While the upgrade is ongoing,never power

5. After the upgrade startup, the power light will flash continuous.

off the unit. Otherwise the upgrade will fail and the system may have a serious damage beyond recovery (inability to start).

After the monitor microprocessor software is upgrade, should preform the "Industry Init " by all mean.

16

6. A failure in the process will trigger the upgrade failure screen.The word "NG" changes to red for the item failed.

UPGRADE FAILURE

MONITOR

Model err

NG

LC-20D42U

OLD Version

NEW Version

0.95

0.95

NOTE: In the event of a failure,repeat the upgrading process.If the process repeatedly fails, it is likely that the hardware is troubled.

7. Upon completion of the whole process,the set will restart autowatically.

8. Unplug the AC cord and remove the USB Memory for version upgrade.

9. Now the software versin upgrade is complete.

NOTE: When you are done with the software version upgrade,start the set,go to the top page of the adjustment process screen and check the mon-

itor microprocessor software version information and panel size information.

2.4. LCD TV Adjustment item

1.MICON SOFTWARE Writing

(1) Monitor Micon and Main Micon software writing (Main PWB : QPWBXE001WJN1)

Adjustment item

1 Software writing Inspection mode

Adjustment conditions

Connect the tool by using write MAIN soft to P9301 (TL9301,TL9302,TL9310 - TL9355,TL9357,
TL9359,TL9375,TL9378,TL9380 - TL9383) that is mounted on the main PWB,and insert USB
Memory by using MONITOR MICON to main PWB.MONITOR connect to TL8123,TL8124 that
denoted figure. Load stated voltage to MAIN PWB, write the lastest version MAIN SOFT to

file version checking

IC8451, and write the MONITOR MICON SOFT to IC2002, after all completed,turn off the AC
power.
NOTE
When the USB MEMORY cant insert to main PWB or read out is error,MAIN Miro software
must be writed anain.

2. Signal adjustment

(1) Checking the Device

Before starting the adjustment,make sure the adjustment tool and signal generator are set for Sharp LCD US.

Checking the signal generator level adjustment (Set to th standard level)

•

Composite signal : 0.714 Vp-p ± 0.02 (from pedestal to white)

•

15K component signal : Y level : 0.714 Vp-p ± 0.02 (from pedestal to white)

Pb, Pr LEVEL : 0.7 Vp-p ± 0.02 Vp-p

•

33K component signal : Y LEVEL : 0.7 Vp-p ± 0.02 Vp-p (from pedestal to white)

Pb, Pr LEVEL : 0.7 Vp-p ± 0.02 Vp-p

•

Analog RGB signal : RGB LEVEL : from pedestal to white)

0.7 Vp-p ± 0.02 Vp-p

Adjustment procedure

17

LC-20D42U

(2).Process mode

Adjustment item Adjustment procedure

Process mode Enter the process adjustment mode using the process adjustment remote controller

1

(3

)Composite N358 signal/tuner adjustment

Adjustment item

1 Setting N358 signal

Adjustment conditions

Adjustment conditions

US-10ch

Adjustment procedure

•

Feed the N358 color bar signal(75%)to VIDEO 1 Input

•

Feed the RF signal (by use of US-10CH) to TUNER.

[Video input signal] [US-10ch]

75% Color saturation

100% white 0% black 100% white

2 Automatic adjust-

ment execution

(4) 15K COMPONENT signal adjustment

Adjustment item

1 Setting 480i signal Feed the 100% color Bar signal to VIDEO1 COMPONENT input

2 Automatic adjust-

ment execution

(5) Component 33Ksignal adjustment

Adjustment item

1 Setting 1080i signal Feed the 100% color Bar signal to VIDEO1 CIMPONENT input

Adjustment conditions

Adjustment conditions

Move the cursor to [ N358 ADJ] and press the [ENTER] key.

When [ N358 ADJ OK] appears,the adjustment is complete.

Adjustment procedure

100% Color saturation

100% white

Move the cursor t0 [ COMP 15K ALL ADJ] and press the [ENTER] key..
When [ COMP 15K ALL ADJ OK] appears, the adjustment is complete.

Adjustment procedure

480i
100% color bar

0% black

2 Automatic adjust-

ment execution

100% Color saturation

100% white

Move the cursor to [ HDTV ADJ ] and press the [ENTER] key.
When [ HDTV ADJ OK] appears, the adjustment is complete.

1080i
100% color bar

0% black

18

(6) Analog RGB signal adjustment

Adjustment item

1 Setting Analog RGB signal: XGA

Adjustment conditions

(1024x768) 60HZ

SYNC: HV separate

LC-20D42U

Adjustment procedure

Feed the XGA100% color bar signal to analog RGB input.

2Automatic adjust-

ment execution

) Tuner/V-Chip test

(7

Adjustment item

1 Setting NTSC RF signal

2 Automatic adjust-

ment execution

Adjustment conditions

US-4(AIR)ch

100% Color saturation

100% white

Move the cursor to [ ANALOG RGB ADJ] and press the [ENTER] key.

When [ ANALOG RGB ADJ OK] appears ,the adjustment is complete.

•

Feed the NTSC signal to RF ANTENNA.

Move the cursor to[ TUNER VCHIIP TEST(*04ch)] and press the [ENTER] key.

(* Select the channel according to RF signal.)

When [ A-OK(***.**)/VM-OK] appears in blue, the test is complete.(If [A-NG/VM-NG]
appears in yellow or red, the test is incomplete.
Make sure a displacement of ±

Adjustment procedure

0.0625MHZ from the center frequency is acceptable.

XGA
100% color bar

0% black

19

LC-20D42U

3.White balance adjustment

Adjustment item

1 Setting For detailed adjustment procedure refer to "Kameyama Model Integral WB Adjustment

2 Automatic adjust-

ment execution

Adjustment conditions

[Command]
Process mode
KRSW0001
KKT10037

Setting

KYOF0000

OSDS0001
SBSL0016

Multi-point adjustment

MSET0001

Adjustment value

initialization
MSET0004

Point 6
WBI60928
MG6G****
MG6B****
MG6R****

Point 5
WBI50800
MG5G****
MG5B****
MG5R****

Point 4
WBI40680
MG4G****
MG4B****
MG4R****

Point 3
WBI30480
MG3G****
MG3B****
MG3R****

Point 2
WBI20312
MG2G****
MG2B****
MG2R****

Point 1
WBI10168
MG1G****
MG1B****
MG1R****

Specifications V1.4".

1) Make the following settings for the set.

2) Connect the white balance adjustment tool to the set.
[Adjustment prcedure]

1) Using the remote controller,transmit the "monitor adjustment process" code.

2) Set the 6

3) Set the 5

4)

5)

6)

7)

8) With the MSET0003 command, write the adjustment values and turn off the AC

* Initial R, G and B settings at point 6: Gradation level set at 928
* Initial R and B settings at points 1 thru 5:Correct the setting same remainder of

RGB setting at each point (This is because the adjustment is made to achieve the
same remainder of RGB setting/4 at each point.

[Adjustment value]

As per the "standard set" submitted by Engineering Department

[LC-20D42U] Teaching Set.

[Adjustment reference] Instrument:[Minolta CA-210] Engineering instrument

Point 6 928 X=0.272 ±0.0012 ±0.0020

Point 5 800 X=0.272 ±0.0012 ±0.0020

Point 4 680 X=0.272 ±0.0012 ±0.0020

Point 3 480 X=0.272 ±0.0012 ±0.0020

Point 2 312 X=0.272 ±0.0020 ±0.0030

Point 1 168 X=0.272 ±0.0035 ±0.0045

Note Set conditions for inspection

AV MODE: [DYNAMIC]
Backlight: +16
Aging time: Min. 60 minutes

th

turn down the R,G and B settings to their reference levels.

Correct the G setting (800 x 6th point G setting /928) (rounded off), and make the R
and B settings to their reference levels.

Set the 4

Correct the G setting (680 x 6th point G setting /928) (rounded off), and make the R
and B settings to their reference levels.

Set the 3rd point to the specified gradation level.

Correct the G setting (480 x 6th point G setting /928) (rounded off), and make the R
and B settings to their reference levels.

Set the 2nd point to the specified gradation level.

Correct the G setting (312 x 6th point G setting /928) (rounded off), and make the R
and B settings to their reference levels.

Set the 1st point to the specified gradation level.

Correct the G setting (168 x 6th point G setting /928) (rounded off), and make the R
and B settings to their reference levels.

power.

point to the specified gradation level,With the strongest color being fixed, ,

th

point to the specified gradation level.

th

point to the specified gradation level.

Level Reference Adj. spec Ins. spec

Adjustment procedure

y=0.277

y=0.2777

y=0.277

y=0.277

y=0.277

y=0.277

AV MODE: [DYNAMIC] (Reset)

Monochro: ON

Aging Time: Min. 60 minutes

Writing
MSET0003

20

4. Key writing

1. EDID writing (Main PWB :QPWBXE001WJZZ,Analog RGB/GDMI input terminal)

Adjustment item

1 Analog RGB

EDID writing

HDMI EDID

2

Writing

Adjustment conditions

File Version checking 1) Using the checker,write the EDID data for HDMI to

IC1505 that is mounted on the main PWB.

TL1514: I2C CLODK, TL1515: 12C DATA
TL1516: 5V, TL1517: GND

TL1524: write protection (H:write enable,Low: write

protection)

2) In the analog RGB inspection,use a DDC-compatible
device. If the EDID has been written,the RGB input

does not function normally.

Inspection mode
File version checking

1)

Using the checker,write the analog HDMI EDID data to
IC1501 and IC1502 that are mounted on the main PWB.

TL15108/1510: I2C CLODK, TL1509/1511: 12C DATA

TL1512/1513: 5V, TL1519/1518: GND

TL1534/1535: write protection (H:WP,Low: write enable)

2) Write the data before the HDMI inspection with the

checker.

In the HDMI inspection, use a DDC-compatible device.If
the EDID has been written,the HDMI input does not
function normally.

LC-20D42U

Adjustment procedure

21

LC-20D42U

Repeat until RGB
become the target
values.

PC Set

Set the light level to MAX with the light control command
(SBSL0016 for 45).
SBSL0016

Setting is complete.
OK

Multi point adjustment mode setting
MSET0001

Multi point adjustment mode is set.
OK

Initialize adjustment values.
MSET0004

Initialization is done.
OK

Adjustment gradation setting (point 6 = 232 gradation adjustment*)
LEV60232

Pattern display

Adjustment values are set.
OK

Adjust RGB to the target xy values.
MG6RXXXX
MG6GXXXX
MG6BXXXX
* XXXX indicates the adjusted values between 0000 and 1023
(4 digit decimal number with zero fill).
* In order to adjust by reducing the value, set the strongest color
as the fixed color.
* The default adjustment value of RGB is the parameter value of
the LEV6 command multiplied by 2.

The adjustment value is
reflected in the image.

Adjustment values are set.
OK

Adjustment gradation setting (point 5 = 200 gradation adjustment*)
LEV50200

Pattern display

Adjustment values are set.
OK

Correction of G value
MG5G0800
When G is changed at gradation 6, calculate the ratio of the
change and set the following value to XXXX: (the value set with
LEV5) x 2 x (the ratio).

Adjustment values are set.
OK

22

Start measurement

Repeat until RGB
become the target
values.

LC-20D42U

PC Set

Adjust RB to the target xy values.
MG5RXXXX
MG5BXXXX
* XXXX indicates the adjusted values between 0000 and 1023
(4 digit decimal number with zero fill).
* G is fixed.
* The default adjustment value of RGB is the parameter value
of the LEV5 command multiplied by 2.

The adjustment value is
reflected in the image.

Adjustment values are set.
OK

Adjustment gradation setting (point 4 = 170 gradation adjustment*)
LEV40170

Pattern display

Adjustment values are set.
OK

Correction of G value
MG4G0680
When G is changed at gradation 6, calculate the ratio of the
change and set the following value to XXXX: (the value set with
LEV4) x 2 x (the ratio).

Start measurement

Repeat until RGB
become the target
values.

Adjustment values are set.
OK

Adjust RB to the target xy values.
MG4RXXXX
MG4BXXXX
* XXXX indicates the adjusted values between 0000 and 1023
(4 digit decimal number with zero fill).
* G is fixed.
* The default adjustment value of RGB is the parameter value of
the LEV4 command multiplied by 2.

The adjustment value is
reflected in the image.

Adjustment values are set.
OK

Adjustment gradation setting (point 3 = 120 gradation adjustment*)
LEV30120

Pattern display

Adjustment values are set.
OK

Correction of G value
MG3G0480
When G is changed at gradation 6, calculate the ratio of the
change and set the following value to XXXX: (the value set with
LEV3) x 2 x (the ratio).

Adjustment values are set.
OK

23

LC-20D42U

Start measurement

Repeat until RGB
become the target
values.

PC Set

Adjust RB to the target xy values.
MG3RXXXX
MG3BXXXX
* XXXX indicates the adjusted values between 0000 and 1023
(4 digit decimal number with zero fill).
* G is fixed.
* The default adjustment value of RGB is the parameter value of
the LEV3 command multiplied by 2.

The adjustment value is
reflected in the image.

Adjustment values are set.
OK

Adjustment gradation setting (point 2 = 78 gradation adjustment*)
LEV20078

Pattern display

Adjustment values are set.
OK

Correction of G value
MG2G0312
When G is changed at gradation 6, calculate the ratio of the
change and set the following value to XXXX: (the value set with
LEV2) x 2 x (the ratio).

Start measurement

Repeat until RGB
become the target
values.

Adjustment values are set.
OK

Adjust RB to the target xy values.
MG2RXXXX
MG2BXXXX
* XXXX indicates the adjusted values between 0000 and 1023
(4 digit decimal number with zero fill).
* G is fixed.
* The default adjustment value of RGB is the parameter value of
the LEV2 command multiplied by 2.

The adjustment value is
reflected in the image.

Adjustment values are set.
OK

Adjustment gradation setting (point 1 = 42 gradation adjustment*)
LEV10042

Pattern display

Adjustment values are set.
OK

Correction of G value
MG1G0168
When G is changed at gradation 6, calculate the ratio of the
change and set the following value to XXXX: (the value set with
LEV1) x 2 x (the ratio).

24

Adjustment values are set.
OK

g

Start measurement

Repeat until RGB
become the target
values.

LC-20D42U

PC Set

Adjust RB to the target xy values.
MG1RXXXX
MG1BXXXX
*XXXX indicates the adjusted values between 0000 and 1023
(4 digit decimal number with zero fill).
* G is Fixed.
* The default adjustment value of RGB is the parameter value of
the LEV1 command multiplied by 2.

The adjustment value is
reflected in the image.

Adjustment values are set.
OK

Writing of adjusted values
MSET0003

Writing is complete.
OK

Deleting adjustment patterns
MSET0000

Deletion is complete.
OK

Completion of adjustment

5. Factory settings

After making the factory settings.pull off the AC cord.

NOTE: Do not turn on the power once the factory settings have been made. Otherwise the factory setting must be made again.

Adjustment item

1 Factory settings Finally pull off the AC cord. • Move the cursor to the [INDUSTRY INIT] line. Using the

Adjustment conditions

[VOL+/-] keys. set this item ON and press the [ENT] key.
The version confirm window appears on the green
screen. When [SUCCESS] appears at the top, the fac­tory settings are complete.(If an error occurs.[ERROR]
appears on the red screen.)

• Finally turn off AC power.
The following settings are returned to the factory ones.

1) User settings

2) Channel data (broadcast frequencies,etc.)

3) Password setting

4) Operation time

5) Automatic installation flag

6) V-CHIP block setting

Adjustment procedure

6. Software version

The software version will be reported at the Conversion Judgment Meeting. Possible modifications that will follow will be reported using the Modifica­tions Report.

* Main microprocessor

* Monitor microprocessor

* EDID data (HDMI/analo

RGB)

25

LC-20D42U

PUBLIC MODE SETTING PROCEDURE

1. How to start Public Mode

• There are the following two ways to get the public mode setup screen displayed.
1 In the adjustment process mode, turn on "HOTEL MODE". Also press the "CH (ù)" and "VOL (+)" keys on

the set at once and turn on the power.

2 1) Press the "INPUT" and "VOL (+)" keys on the set at once and turn on the power.

2) Get the password input screen displayed.

Procedure

• The input starts with the leftmost digit.

• Use the numeric keys [1] thru [9] and [0] key on the remote controller.

The other keys are not acceptable.

• With a numeric-key input, "–" will change to " ". The input position
will move one digit to the right.

• With all the 3 digits entered, the password will be verified.

3) The 3-digit password is now verified.
The password [0] [2] [7] provides for the public mode screen. (This screen comes on with whatever
adjustment process settings.)
With any other passwords, the screen changes to the normal mode.

26

LC-20D42U

2. How to exit Public Mode

There are the following ways to quit the public mode setup screen.

• Tu rn off "HOTEL MODE" in the adjustment process mode. (✩) ← This way alone is not for quitting the setup
screen, but for quitting the mode itself.

• Tu rn off the power with the "POWER" key. (★)

• Select "EXECUTE". (★)

★ ... "HOTEL MODE" stays on in the adjustment process mode.
✩ ... The settings will be back to the factory ones.

3. Public Mode Setting Values

• With the factory settings made, the public mode settings get initialized. (The adjustment process remains intact.)

4. Public Mode Menu

The guidance is not displayed onscreen.
Setup procedure

• To move the cursor up and down, use the "cursor UP/DOWN" key (remote controller) and "CH (ù)/(Ù)" key

(remote controller and set).

• To change the settings, use the "cursor RIGHT/LEFT" key (remote controller) and "VOL (+)/(–)" key (remote

controller and set).

• To save new settings, keep the cursor at "EXECUTE" and use the "ENTER" key (remote controller) .

Public mode

Power on fixed [Variable ]

Maximum volume [ 60 ]

Volume fixed [Variable ]

Volume fixed level [ 60 ]

RC button [Respond ]

Panel button [Respond ]

Menu button [Respond ]

On screen display [Yes ]

Input mode start [Normal ]

Input mode fixed [Variable ]

Reset

EXECUTE

27

LC-20D42U

5. On Setting Items

* "EZ-SETUP" discussed below indicates "EZ-SETUP after the first power-on".
(1) POWER ON FIXED

Selection
Default
Explanation

Limit in Setting
Exception
Remarks

(2) MAXIMUM VOLUME

Selection
Default
Explanation
Limit in Setting

Exception
Remarks

Selection between

"Var iable" and "Fixed" (loop provided)

Variable
In

"Fixed" setting, the power-off by the power key of the unit is invalidated and the image is kept being

received. The power can be turned off by stopping the power supply from AC.
Refer to the

"Power-On Fixed" sheet.

None

Adjustment from 0 to 60 (no loop)
60
Sound volume can not be adjusted higher than the preset value.

•

When the sound volume is set lower than 59, only figures are displayed and the sound volume bar is not
displayed.

•

The maximum sound volume for ON-timer (Wake up timer) is limited also to the preset value.

None

•

In line output (sound volume variable), the sound volume can be adjusted from 0 to 60 irrespective of pre­adjusted value.

•

When the sound volume is set higher than the MAX setting by the adjusting process, the sound volume
control operation is prohibited for turn-up and the sound volume should be turned down to MAX in this
state.

(3) VOLUME FIXED

Selection
Default
Explanation
Limit in Setting

Exception
Remarks

Selection between "Variable" and "Fixed" (loop provided)
Variable
Sound volume is fixed and made invariable.

•

•

None

•

•

•

The sound volume for the ON-timer (Wake up timer) is fixed also without display of menu. Besides, the
setting is made impossible. (Basically, the menu is not displayed.)
The following keys become invalid:

•

Sound volume Up/Down (VOL +/-) [for both remote control and the unit]

•

Mute (MUTE)

In line output (sound volume variable), the sound volume can be adjusted from 0 to 60 irrespective of pre­adjusted value.
As for sound volume fixing and sound volume MAX level, the sound volume fixing has priority.
Once the sound volume has been changed by adjustment process, it should be set back to the sound
volume preset by sound volume fixing level when the adjustment process ends .

28

(4) VOLUME FIXED LEVEL

Selection
Default
Explanation
Limit in Setting
Exception
Remarks

Adjustment from 1 to 60 (no loop)
60
The sound volume to be fixed by
None
None
Setting is valid only when

(5) R/C BUTTON

Selection
Default
Explanation
Limit in Setting
Exception

Remarks

Selection between
Respond
Keys acceptable by remote control are limited or reception of keys can be prohibited.
In

"No respond" setting, all the keys (including the power key) are not accepted.

•

Adjustment process, factory setting, inspection process and hotel only keys are valid irrespective of setting.

•

All the keys can be used in adjustment process, inspection mode and hotel menu irrespective of setting.

•

All the keys can be used also in the initial EZ-Setup after power-ON irrespective of setting.

(6) PANEL BUTTON

Selection
Default
Explanation
Limit in Setting
Exception

Remarks

Selection between
Respond
All the operations by keys (except the power key) of the unit can be invalidated.

•

Inspection mode and hotel menu mode can be started irrespective of setting.

•

All the keys can be used in adjustment process, inspection mode and hotel menu irrespective of setting.

•

In U.S.A model, all the keys can be used also in the initial EZ-Setup after power-ON irrespective of
setting.

LC-20D42U

"Volume fixed" is determined.

"Volume fixed" is selected for "fixed".

"Respond" and "No respond" (loop provide)

"Respond" and "No respond" (loop provide)

(7) MENU BUTTON

Selection
Default
Explanation

Limit in Setting

Exception

Remarks

Selection between "Respond" and "No respond" (loop provide)
Respond
In
unit are invalidated.

•

•

•

"No respond" setting, the menu operation by the menu key of the remote control and the menu key of the

Inspection mode and hotel menu mode can be started irrespective of setting.
All the keys can be used in adjustment process, inspection mode and hotel menu irrespective of setting.
All the keys can be used also in the initial EZ-Setup after power-ON irrespective of setting.

29

LC-20D42U

(8) ON SCREEN DISPLAY

Selection
Default
Explanation

Limit in Setting

Others

Exception

Remarks

Selection between "Ye s " , "NO" (loop provide)
Ye s
The following OSD displays are made ineffective.
Displays of menu group, channel call, sound volume bar and direct key call

•

ON-timer (Wake-up timer) is cleared and set to "OFF".

•

Set time of the OFF-timer (SLEEP TIMER) is cleared.

•

Setting of the no-signal power-OFF (AUTO POWER OFF) is cleared to "OFF".

•

Setting of the no-operation power-OFF is cleared to "OFF".

•

Keys falling under any of the following items become invalid.

1Appearance of screen changes and the sound changes.
2Personal functions which are hard to restore.

Screen display, menu, OFF-timer, ON-timer, AV MODE, screen size switching, clock setting, treble
emphasis, AUDIO ONLY, sound changeover, LANGUAGE, CLOSED CAPTION

•

Simple input switching is generated. Those which are restored soon after leaving as they are and may be
requested for change by customer are not prohibited.
Brightness sensor (BACKLIGHT) .

•

Such a caution which is displayed independently is displayed as it is.
Non-responding signal caution.

•

When CC has already been ON, CLOSED CAPTION is displayed.

(9) INPUT MODE START

Selection
Default
Explanation

About options

Limit in Setting
Exception
Remarks

Selection between
Normal
In power-ON, the input source to be started or channel can be set.
(In standard mode, the operation follows the last memory.)

•

All the input sources in the model are made selectable.

•

When the input/output switchable input source is selected and the input source is set to output, the setting
of input/output switching is changed to input at the execution of hotel menu. In addition, the input/output
switching by menu is prohibited.

•

In TV mode, the channel to be set follows the last memory and the content of the last memory is included
in the notation by options. Ex.) TV (CH2), TV (CH4) etc.

•

The display of channel setting menu and the channel setting operation are prohibited.

None

•

In setting at "Normal", the setting of "Input mode fixed" is changed to "Variable" and selection should be
prohibited.

(10) INPUT MODE FIXED

Selection
Default
Explanation

Limit in Setting

Exception
Remarks

Selection between
– (Variable)
The input mode is fixed at the input source or the channel set at the
sources and channels can be made non-selectable.

•

With the execution of hotel mode, the input source is forced to change to that set by "Input mode start"
and the channel switching and input switching are prohibited thereafter.

•

ON-timer's (Wake-up timer) channel items are not displayed or the operation is prohibited. (Basically, they
are not displayed.)

•

The following keys are invalidated.
CH '", direct tuning button, FLASHBACK, input
~However, the keys (input switching and CH '" keys) of the unit for menu operation remain valid.

None

•

In the following case, setting is cancelled and mode is changed to "Var iable".
1When the setting of

"Normal" , "Air/Cable (CH~)", "INPUT 1/2/3","HDMI","HDMI2","DVI" (loop provide)

"Var iable" and "Fixed" (loop provide)

"Input mode start" in 9 and other input

"Input mode start" is set to NORMAL.

30

TROUBLESHOOTING TABLE

No power supply (Front LED does not light up) and no power-up even is turned on (Front LED light up to blue)

LC-20D42U

Is the AC cord connected?

Yes

Are the harness and Cable connected
properly?

Yes

Are F1 normal?

Yes

Is the voltage of C4 approx. 160V?

Yes

Are UR12V supplied?

Yes

No

Connect the AC cord and turn on the power.

No

Connect the hamess and Cable properly.

No

If the fuse is blown when turning on the power after replacing F1.replace Q1 and
PC1.

No

Check if L1,TH1 and BD1 are normal.

No

Does AC-CTRL (pin10 of CN1) become High (approx. 3.3V)?

Yes

Check the rectifier circuit of UR12V

Is the unit set to STANDBY MODE?
Is the main unit normal?

No

Is 24V supplied?

Yes

Turn on the power again,and check if
the unit works normally.

Remarks

State of the set

STDBY

MODE1

MODE2

Power ON

PS_ON
(CN1 )

High

Low

High

10

UR12V
(CN1 )

No

Do the primary side and secondary side of T1/T1A oscillate normally?

Are D20 out of order?

UR24V

1

(CN2 )

12V

--

12V

1

24V

24V

Yes

No

Are there defective parts on the pri­mary side?Is the output on the Sec­ondary side short-circuited?

31

LC-20D42U

TROUBLESHOOTING TABLE (Continued)

No audio output during UHF/VHF reception

Is SIF output from the tuner (TU1101_Pin15) normal?

Yes

Is input signal fed to pin21 (SOUNDIF 1)of IC1401(SIF
Demodulator) normal?

Yes

Are audio signals from pins 29 and 30 (SC2_OUTL/R) of
IC1401 to pins 51 and 52 of IC1404 (CODEC) normal?

Yes

Are audio outputs (A-OUT_L/R) of pins 38 and 39 of
IC1404 normal?

Yes

Is audio input from pins 38 and 39 of IC1404 to pin 3 and 5
of IC2701 (STEREO_AMP) normal?

Yes

Is audio output from IC2701 normal?

Yes

Check the connector (P2703) of AV_UNIT and around the
speakers.

No

Check the tuner and peripheral circuits.

No

Check the filter circuits (Q1102-3) and peripheral
circuits

No

Check between pins 29 and 30 (SC2_OUTL/R) of
IC1401 and pins 51 and 52 of IC1404(CODEC)

Are the DSP_LRCK,DSP_BCKIN,DSP_SDIN1,

No

DSP_MCLK,DSP_SDOUT1,DSP_SDOUT2 signals
sent from IC1404 to IC1407(DSP) normally?

Yes

Check IC1404 and peripheral circuits.

No

Check the circuits between pins 38 and 39 of
IC1404 and pins 3 and 5 of IC2701. (MUTE
cercuits:Q1307,Q1314,Q1313)

No

Check IC2701 and peripheral circuits

No monitor audio output

Is monitor audio output set to "Variable"?

No

Are audio output pins 40 and 41 of IC1404 (CODEC)
normal?

Yes

Are audio output pins 7 and 1 of IC1408 (Buffer_AMP)
normal?

Yes

Check between IC1408 and MONITOR OUTPUT terminal
(J501,J502).

Yes

Reset monitor audio output to "Fixed".

No

Check IC1404 and peripheral circuits.

No

Check IC1408 and peripheral circuits.

32

TROUBLESHOOTING TABLE (Continued)

No audio output from external input

<<HDMI>>[INPUT-4/INPUT5 (Digital audio mode)]
Is digital audio signal (DTV_SPDIF) fed from pin E12 of IC8101 to pin 4 of IC1404?

<<HDMI>>[INPUT-5(Analog audio mode)]
Is L-ch audio signal fed from pin 3 of input terminal J1501 to pin 57 of IC1404?
Is R-ch audio signal fed from pin 2 of input terminal J1501 to pin 58 of IC1404?

PCIPUT<<INPUT-6>>
Is L-ch audio signal fed from pin 2 of input terminal J1502 to pin 55 of IC1404?
Is R-ch audio signal fed from pin 3 of input terminal J1502 to pin 56 of IC1404?

<<INPUT-1>>
Is L-ch audio signal fed from input terminal J505 to pin 12 of IC1405?
Is R-ch audio signal fed from input terminal J505 to pin 1 of IC1405?

<<INPUT-2>>
Is L-ch audio signal fed from input terminal J505 to pin 15 of IC1405?
Is R-ch audio signal fed from input terminal J505 to pin 2 of IC1405?

Is L-ch audio signal fed from pin13 of IC1405 to pin 53 of IC1404?
Is R-ch audio signal fed from pin3 of IC1405 to pin 54 of IC1404?

Yes

No audio output during digital broadcasting reception

<<INPUT-3>>
Is L-ch audio signal fed from input terminal J509 to pin 4 of IC1405?
Is R-ch audio signal fed from input terminal J509 to pin 5 of IC1405?

LC-20D42U

Are the 12S signals DAKCK,SCLK,LRCK,and DATAOUT
sect from pins B22,F13,E13 and F12 of IC8101 normally?

Yes

Are input signals of pins 24 (DAKCK),11(SCLK),10(LRCK),
32(DATA) of IC1404 normal?

Yes

Are audio signals from pins 29 and 30 (SC2_OUTL/R) of IC1404 to
pin 27 and 25 of IC1407 (DSP) normal?

Yes

Are audio outputs (A-OUT_L/R) of pins 38 and 39 of IC1404 normal?

Yes

Is audio input from pins 38 and 39 of IC1404 to pins 3 and 5 of
IC2701(STEREO_AMP) normal?

Yes

Is audiio output from IC2701 normal?

Yes

No

Check around IC8101 BCM3551.

No

Check the circuits between pins B22,F13,E13 and F12 of IC8101
and pins 24,11,10 and 32 of IC1404.

No

Check between pins 29 and 30 (SC2_OUTL/R) of IC1404 and pins
27 and 25 of IC1407 (DSP).

No

Are the LRCK,BICK,SDTO and SDTI signals sent from IC1404 to
IC1407 (DSP) normally?

Yes

Check IC1403 and peripheral circuits.

No

Check the Circuits between pins 38 and 39 of IC1404 and pins 3 and
5 of IC2701.(MUTE circuits:Q1307,Q1313,Q1314)

No

Check IC2701 and peripheral circuits.

Check the connector (P2703) of AV_UNIT and around the speakers

33

LC-20D42U

TROUBLESHOOTING TABLE (Continued)

<Component video signal input> No video output (1)

No video output from extermal input <<INPUT-1>>

Is INPUT-1 selected on the input switching menu screen?

Yes

Is video signal fed to pin 21 of IC501 (AV SWITCH)?

Yes

Is video signal sent to pin 60 of IC501?

Yes

Is video signal fed to pin K25 of IC8101 (Broadcom) via
L.P.F. composed of Q2202 and Q2210?

Yes

Are digital video (LVDS) signals sent from pins 37-42 and
45-48 of IC2602?

Are digital video (COMOS) signal sent from IC8101
(DVODATA 0-23,DVOCLKO,DVODE,DVOHSYNC,
DVOVSYNC)?

Yes

Select INPUT-1 and the input signal on the input switching
menu screen.

No

When INPUT-1 cannot be selected since the characters
INPUT-1 on the menu screen are gray.

Yes

Is the video signal detection function normal?
Check between J507 and pin 38 of IC501.

No

Check between J507 and pin 21 of IC501.

No

Check IC501 (AV SWITCH) and peripheral circuits.

No

Check between IC501 and IC3301.(Q2202,Q2210,etc.)

No

Check IC2602 and peripheral circuits.

No

Check IC8101 and peripheral circuits.

Check LCD_CONTROL PWB.

34

TROUBLESHOOTING TABLE (Continued)

<Component video signal/S-video signal input> No video output (2)

LC-20D42U

No video output from extermal input <<INPUT-3>>

Yes

Is INPUT-2 selected on the input switching menu screen?

Yes

Is video signal fed to pin 21 of IC507 (AV SWITCH)?

<Composite video signal input>
Is video signal fed to pin 3 of IC509?

<S-video signal input>
Are Y and C signals fed to pins 5 and 7 of IC501
respectively?

Yes

<Composite video signal input>
Is video signal sent to pin 60 of IC501?
<S-video signal input>
Are Y and C signals sent to pins 60 and 59 of IC501
respectively?

Yes

No

Select INPUT-3 and the input signal on the input switching
menu screen.

No

When INPUT-3 cannot be selected since the characters
INPUT-2 on the menu.

Yes

Is the video signal detection function normal?Check
between J509 and pin 42of IC501.

Is the S-video signal detection function normal?Check
between J509 and pin 2 of IC501.

No

Check between J509 and pin 3 of IC501.

Check between J509 and pin 5 and 7 of IC501.

Check IC501 (AV SWITCH) and peripheral circuits.(Q501,

No

Q502,Q503,Q504,etc.)

Check between IC501.(Q501,Q502,Q503,Q504,etc.)

<Composite video signal input>
Is video signal fed to pin K25 of IC8101 (Broadcom) via
L.P.F. composed of Q2202 and Q2210?
<S-video signal input>
Are Y and C signals fed to pins K25 and L24 of IC8101
(Broadcom) via L.P.F. composed of Q2202 and Q2210
and via L.P.F. composed of Q2203 and Q2211
respectively?

Yes

Are digital video (LVDS) signals sent from pins 37-42 and
45-48 of IC2602?

Are digital video (COMOS) signal sent from IC8101
(DVODATA 0-23,DVOCLKO,DVODE,DVOHSYNC,
DVOVSYNC)?

Yes

Check LCD_CONTROL PWB.

Check between SC1101 and IC3301.(Q2202,Q2210,etc.)/

No

(Q2203,Q2211,etc.)

No

Check IC2602 and peripheral circuits.

No

Check IC8101 and peripheral circuits.

35

LC-20D42U

TROUBLESHOOTING TABLE (Continued)

No video output during ANALOG broadcasting reception

Is video signal sent to output terminal pin 13 of tuner
(TU1101)?

Yes

Is video signal fed to pin 7 of IC1103 (LEVEL ADJ)?

Yes

Is video signal fed to pin R26 of IC8101 (Broadcom) via L.P.F. composed of Q2204 and Q2208?

Yes

Are digital video (LVDS) signals sent from pins 37-42 and
45-48 of IC2602?

Are digital video (COMOS) signal sent from IC8101
(DVODATA 0-23,DVOCLKO,DVODE,DVOHSYNC,
DVOVSYNC)?

Yes

Check LCD_CONTROL PWB.

No

Check or repiace the tuner's peripheral circuits.

No

Is control signal for level adjustment fed from pin 1 of
IC1104 to pin 6 of IC1103?

No

Check or replace IC1104 (CONTROL) and peripheral
circuits.

No

Check between IC1103 and IC3301.(Q2204,Q2208,etc.)

No

Check IC2602 and peripheral circuits.

No

Check IC8101 and peripheral circuits.

36

TROUBLESHOOTING TABLE (Continued)

<Component video signal input> No video output (3)

No video output from external input<<INPUT-1>>

Is INPUT-1 selected on the input switching menu screen?

Yes

No

Select INPUT-1 and the input signal on the input switching
menu screen.

When INPUT-1 cannot be selected since the characters
INPUT-1 on the menu screen are gray.

Yes

Is the component video signal detection function normal?
Check between 6 pin of J507 and pin 38 of IC501.

LC-20D42U

Are component video signals fed to pins 21,23 and 25
(Y,Pb and Pr) of IC501 (AV SWITCH)?

Yes

Are Y,Pb and Pr signals sent to pins 60,59 and 58 of
IC501 respectively?

Yes

Are component video signals sent to R574,R580,R586 Via
the Net of Q501-Q506?

Yes

Are Y,Pb and Pr signals fed to pins L26,J25 and J26 of
IC8101 (Broadcom) respectively? Via LPF composed of
Q2202,Q2203,Q2206,Q2210,Q2211 and Q2212.

Yes

Are digital video (LVDS) signals sent from pins 37-42 and
45-48 of IC2602?

Are digital video (COMOS) signal sent from IC8101
(DVODATA 0-23,DVOCLKO,DVODE,DVOHSYHC,
DVOVSYNC)?

Yes

Check LCD_CONTROL PWB.

No

Check between J507 and each input pin of IC501.

No

Check IC501 and perpheral circuits.

No

Check between IC501 and SC501. (Q501-Q506,etc.)

No

Check IC8801.(Q2210,Q2211,Q2212,etc.)

No

Check IC2602 and peripheral circuits.

Check IC8101 and peripheral circuits.

37

LC-20D42U

TROUBLESHOOTING TABLE (Continued)

No video output from HDMI input (INPUT4)

Are signals fed from HDMI (SC1501) connector to input
terminals H_RX0

74),H_RX2
of IC1507 (TMDS_SW)?

Are signals fed from IC1507 (TMDS_SW) to input
terminals H_RX0
and B18),H_RX2
C19 and D19) of IC8101 (Broadcom)?

Are digital video (LVDS) signals sent from pins 37-42 and
45-48 of IC2602?

Are digital video (COMOS) signal sent from IC8101
(DVODATA 0-23,DVOCLKO,DVODE,DVOHSYHC,
DVOVSYNC)?

Check LCD_CONTROL PWB.

±(pins 70 and 71),H_RX1±(pins 73 and

±(pins 76 and 77) and H_RXC±(pins 67 and 68)

±(pins B19 and A19),H_RX1±(pins A18
±(pins D18 and C18) and H_RXC±(pins

Yes

Yes

Is IC1501(E2PROM) accessed with 12C when connectiong

No

HDMI device and is DDC_12C_CLOCK/DATA data read
out?

YesYes

Check IC1501 and peripheral circuits.
Are cables connected securely?

Check the setting of HDMI device.

No

Check IC1507 (TMDS_SW) and peripheral circuits.
For INPUT4,pin 21 is Low and pin 22 is High.

No

Check IC2602 and peripheral circuits.

Check IC8101 and peripheral circuits.

No

When using an old HDMI transmission device,some video formats cannot be selected or no sound is heard. Since this model
conforms to the latest HDMI standard, the HDMI transmission device does not recognize the data of the latest version
correctly.It is necessary to upgrade its firmware. Download the latest firmware from the web site of each manufacturer,or
contact the customer service center of each manufacturer.

38

TROUBLESHOOTING TABLE (Continued)

No video output from HDMI input (INPUT5)

LC-20D42U

Are signals fed from HDMI (SC1502) connector to input
terminals H_RX0

12),H_RX2
IC1507 (TMDS_SW)?

Are signals fed from IC1507 (TMDS_SW) to input
terminals H_RX0
and B18),H_RX2
C19 and D19) of IC8101?

Are digital video (LVDS) signals sent from pins 37-42 and
45-48 of IC2602?

Are digital video (COMOS) signal sent from IC8101
(DVODATA 0-23,DVOCLKO,DVODE,DVOHSYHC,
DVOVSYNC)?

Check LCD_CONTROL PWB.

±(pins 8 and 9),H_RX1±(pins 11 and

±(pins 14 and 15) and H_RXC±(pins 5 and 6) of

±(pins B19 and A19),H_RX1±(pins A18
±(pins D18 and C18) and H_RXC±(pins

Yes

Yes

Is IC1502 (E2PROM) accessed with 12C when connecting

No

HDMI device and is DDC_12C_CLOCK/DATA data read
out?

YesYes

Check IC1502 and peripheral circuits.
Are cables connected securely?

Check the setting of HDMI device.

No

Check IC1507 (TMDS_SW) and peripheral circuits.
For INPUT5,pin 21 is High.

No

Check IC2602 and peripheral circuits.

Check IC8101 and peripheral circuits.

No

When using an old HDMI transmission device,some video formats cannot be selected or no sound is heard. Since this model
conforms to the latest HDMI standard, the HDMI transmission device does not recognize the data of the latest version
correctly.It is necessary to upgrade its firmware. Download the latest firmware from the web site of each manufacturer,or
contact the customer service center of each manufacturer.

39

LC-20D42U

No video output from PC input (INPUT6)

TROUBLESHOOTING TABLE (Continued)

DIGITAL mode

Analog mode

IS IC1505(E
and is DDC_12C_CLOCK/DATA data read out?

Check the setting of PC.

Are signals from pins 83-76,62-55,50-43,71-68.(DATA0-23,VSYNC,HSYNC,DE,CLK) of IC3304 (ADC) toB23,A23,D22,C22,
E23,A25,D23,B24,F22,A24,C23,E22,D17,F18,E18,F17,E17,C17,B17,A17,C16,D16,F16,E16 ,F23,G22,C25,C24 of IC1801?

Are digital video (LVDS) signals sent from pins 37-42 and
45-48 of IC2602?

Are digital video (COMOS) signal sent from IC8101
(DVODATA0>23,DVOCLKO,DVODE, DVOHSYHC,
DVOVSYNC)?

Check LCD_CONTROL PWB.

2

PROM) accessed 12C when connecting PC

Yes

Check IC1505 and periph­eral circuits.Are cable con­nected securely?

Yes

Yes

No

Are signal fed from pins 1,2,3(Analog-R/G/B),and 13,14(H

Yes

Sync/V Sync) of input terminal (SC1503) to pins 11,9,6,2,3
of IC3304 (A/DC)?

Yes

Check peripheral circuits of IC3304

Check connection of IC3304 and IC8101.

No

Check IC2602 and peripheral circuits.

No

Check IC8101 and peripheral circuits.

No

No

When using an old HDMI transmission device,some video formats cannot be selected or no sound is heard. Since this model
conforms to the latest HDMI standard, the HDMI transmission device does not recognize the data of the latest version
correctly.It is necessary to upgrade its firmware. Download the latest firmware from the web site of each manufacturer,or
contact the customer service center of each manufacturer.

[FRONT-END SECTION]

Digital broadcasting cannot be received.

Yes

Are IF_OUT_P/N signal send from
pin (20) (19) of TU1101 respectively?

No

Check the TU1101.

Yes

Are signal fed to pins U25,U26 of
IC8101?

No

Check between TU1101 and
IC8101(C1104,C1141,etc.).

Yes

Check IC8101 and its peripheral cir­cuits.

40

TROUBLESHOOTING TABLE (Continued)

LED flashing timing chart for error notification

1) Red power LED

Remarks

Remarks

Remarks

Error type Power green LED operation (1 cycle)

Error type OPC LED operation (1 cycle)

Error type OPC LED operation (1 cycle)

Pins are monitor microprocessor pins.

H: On

L: Off

H: On

L: Off

H: On

L: Off

H: On

L: Off

H: On

L: Off

H: On

L: Off

H: On

L: Off

H: On

L: Off

H: On

L: Off

H: On

L: Off

H: On

L: Off

H: On

L: Off

Refer to "Power failure details".

Power failure

Flashes twice

communication failure

Refer to "Communication failure details".

with main CPU

Communication line failure or main CPU communication failure > Check debug statements for the main CPU.

Flashes 3 times

Vsync

failure

Flashes 4 times

Monitor temperature failure

Flashes 5 times

2) Power failure details (Power LED flashes twice and OPC LED flashes)

Pins are monitor microprocessor pins unless otherwise specified.

DET_10V failure

Flashes once

DET_D3.3V failure

Flashes twice

DET_6V failure

Flashes 3 times

Panel 5V failure

Flashes 5 times

Main failure

Flashes 7 times

3) Communication failure details (Power LED flashes 3 times and OPC LED flash

Initial communication

reception failure

Flashes once

Time-out setting reception failure

Start-up confirmation reception failure

Flashes twice

Regular communication failure

Flashes 3 times

The details are displayed in "ERROR STANDBY CAUSE" on page 1 of process A mode for the main microprocessor.

Initial communication from the main CPU is not received. (After canceling the reset, request for the monitor model No. is not received.)

Communication line failure or main CPU start-up failure

Time-out setting and start-up mode change cannot be received from the main CPU. (Start-up communication until time-out setting and

startup mode change is not received.)

Basically, communication logs are analyzed by a bus monitor or debug print logs are analyzed.

Main CPU start-up failure or monitor microprocessor's reception failure

Regular communication that is performed at 1 second intervals in the normal operation is interrupted.

Main CPU operation failure or monitor microprocessor's reception failure

Main microprocessor detection error,

DET_PNL5V (pin 58): Abnormal (L). Panel power is not applied.

If error is detected during operation, error standby is activated by polling.

EU_POW

PS_ON

PANEL_POW

D_POW

If error is detected during operation, error standby is activated by polling.

DET_6V (pin 56): Abnormal (L). D5V,A5V is not applied.

(MONITOR MAX TEMP on process A mode: Change of temperature failure AD value): Thermistor

If error is detected during operation, error standby is activated by polling.

AC_DET (pin 16): Abnormal (L), DET_10V (pin 57). Main converter A9V/UR10V is not applied.

If error is detected during operation, the power is turned on again by interrupt handling (instantaneous blackout processing).

DET_3V3 (pin 59): Abnormal (L). Main power 3.3V is not applied.

VSYNC (pin 46) failure (uninput). Video process operation failure.

Detected during operation (interruption)

If the panel temperature is 60˚C or more for 15 seconds or more in a row, CAUTION appears on the OSD of AVC (flashes in red in the

lower right screen).

If the panel temperature is 60˚C or more for 25 seconds or more in a row, error standby is activated.

MAIN CPU communication: TXD(28pin),RXD(29pin).

H: On

L: Off

Program DATA broken

Flaches & times.

Recovery: Mcu flash ROM DATA failure.

Mcu SOFT rewrite.

>

>

>

LC-20D42U

41

LC-20D42U

IXB870WJQZ BALLOUT

1-1. IC8101 (RH-iXB870WJQZQ)
This IC is a system LSI with the following function.
A cable,ground wave receiver,NTSC decoder,HDMI receiver,transport processor,MPEG video pocessor,digital
andio decoder,analog video processor,graphics processor,MLPS processor, and Peripheral controller.

IXB870WJQZ BALLOUT

123456789101112 13 14 15 16 17 18 19 20 21 22 23 24 25 26

TMODE_

A GND GPIO_54

DDR_VD

B

GPIO_51

DP

DDR0_V

DDR_BV

C

REF1

DDR_1

DDR0_D

DDR0_D

D

ATA26

ATA24

DDR0_D

DDR0_D

E

ATA31

ATA30

DDR0_D

DDR0_D

F

ATA17

ATA16

DDR0_D

DDR0_D

G

ATA23

ATA21

DDR0_WEBDDR0_C

H

J

K GND

L

M

N

P

R

T

U GND

V

W

Y

AA

AB

AC

AD GPIO_30 GPIO_10GPIO_05

AE GPIO_06 VDDO

AF GND

ASB

DDR0_BA0DDR0_BA1DDR0_R

DDR0_A

DDR01

DDR_VDDPDDR0_A

DDR05

DDR0_A

DDR0_A

DDR07

DDR06

DDR0_C

DDR0_C

LK0

LK0B

DDR0_D

DDR0_D

ATA10

ATA12

DDR0_D

DDR0_D

ATA15

ATA00

DDR0_D

DDR0_D

ATA03

ATA05

DDR0_V

REF0

DDR_VDDPDDR_BV

DDR_2

USB_DP1USB_DN1USB_PW

USB_MO

USB_PW

NCDR

RON_1

USB_RREFPKT1_D

ATA

POD_PK

POD_PK

T5P_CL

T5P_DA

K

TA_2

POD_PK

POD_PK

T5P_DA

T5P_DA

TA_4

TA_7

HSX_CL

DVO_27 DVO_21 DVO_17 DVO_12 DVO_7 DVO_DE

1

TMODE_3TMODE_

DDR_PV

GPIO_52 DVO_28 DVO_22 DVO_16 DVO_11 DVO_5 DVO_1

SSP

DDR_BV

GPIO_50

SSR_1

DDR0_D

UART_R

ATA28

XD_2

DDR0_D

DDR0_D

ATA27

ATA25

DDR0_D

DDR0_D

ATA19

DDR0_D

DDR0_D

ATA18

DDR0_C

ASB

DDR0_A

DDR0_A

DDR00

DDR10

DDR0_A

DDR0_A

DDR04

DDR08

DDR0_A

DDR0_CKEDDR0_D

DDR12

DDR0_D

DDR0_D

ATA08

ATA13

DDR0_D

DDR0_DM0DDR0_D

ATA14

DDR0_D

DDR0_D

ATA01

ATA04

DDR0_D

USB_AV

ATA06

DD33

DDR_BV

USB_XT

SSR_2

USB_AV

PKT0-

DD12PL

DATA

L

PKT0_S

RFLT_1

YNC

POD_PK

PKT1_C

T5P_VA

LK

POD_PK

POD_PK

T5P_DA

T5P_DA

TA_0

TA_5

GPIO_29GPIO_55

GPIO_11GPIO_07

POD_PS

_CLK

POD_PS

HSX_DA

_DATA_

TA

PLL_MIP

PLL_MIP

S_AVDD

K

S_AGND

1P2

MAJOR IC INFORMATIONS

VDDO GND DVO_14 DVO_10 DVO_4

0

TMODE_

DVO_25 DVO_19 DVO_13 DVO_6 DVO_2

2

GPIO_53 DVO_29 DVO_23 DVO_15 DVO_8 DVO_3

DDR_CLKUART_T

DDR0_D

QS3

ATA29

DDR0_DM2DDR0_DM3DDR_VD

QS2

DDR0_D

SB0

ATA22

DDR0_A

DDR02

DDR0_A

DDR09

ATA09

DDR0_D

DDR0_D

ATA07

USB_XT

PKT0_CLKPKT1_S

ALI

NO_CON

NECT

POD_PK
T5P_SY

POD_PK
T5P_DA

LID

TA_6

GPIO_56GPIO_09

HSX_SYNCPOD_PS

POD_PS
_SYNC

POD_PS
_DATA_

POD_OB

_CLK

2

PCI_RSTBPCI_GN

DVO_26 DVO_20 DVO_9 DVO_0

XD_2

DDR_PV

DVO_24 GND DVO_18

DDP

DP

DDR0_D

GND VDDC VDDC VDDC VDDC VDDC VDDC VDDC VDDC VDDC VDDC VDDP GND GND GND GND

ATA20

DDR0_A

DDR_VD

DDR03

DP

DDR0_A

GND VDDC GND GND GND GND GND GND GND GND GND VDDC VDDO VDDO

DDR11

DDR0_D

DDR_VD

ATA11

DP

DDR0_D

QS1

QS0

ALO

NC

GND VDDC GND GND GND GND GND GND GND GND GND VDDC VDDO

M1

DDR0_D

DDR_VD

ATA02

DP

USB_AV

USB_MO

DD25PL

NPLLCD

L

R

USB_AGNDUSB_AV

DD12

VDDC VDDC GND GND GND GND GND GND GND GND GND VDDC VDDO GND

YNC

POD_PK

VDDC VDDC VDDC VDDC VDDC VDDC VDDC VDDC VDDC VDDC VDDC VDDC VDDO GND GPIO_25 GPIO_48GPIO_47

T5P_DA

TA_1

POD_PK

VDDC VDDC VDDO VDDO VDDO VDDO VDDO VDDO VDDO VDDO VDDO VDDO VDDO GND GPIO_19 GPIO_24GPIO_35 GPIO_46OB_AGC

T5P_DA

TA_3

GPIO_31GPIO_08 GND

POD_PS
_DATA_

0

POD_PS
_DATA_

_VAL

5

POD_PS

BYP_CP

_DATA_

U_CLK

4

POD_OB

PCI_CLK

_DATA

_OUT

3

PCI_CLK

PCI_AD30PCI_VIO

_IN

PCI_AD21PCI_AD29PCI_AD28PCI_AD24PCI_FRA

T2B

VDDO VDDP VDDO VDDP VDDO VDDO VDDO VDDO VDDO VDDO VDDO VDDP GND GND GND

VDDC GND GND GND GND GND GND GND GND GND VDDC VDDO GND GND

VDDC GND GND GND GND GND GND GND GND GND VDDC VDDO

VDDC GND GND GND GND GND GND GND GND GND VDDC VDDO

VDDC GND GND GND GND GND GND GND GND GND VDDC VDDO

VDDC GND GND GND GND GND GND GND GND GND VDDC VDDO VDDP GND

POD_PS
_DATA_6GND

PLLTES
T_MIPS

PCI_AD22PCI_AD1

PCI_AD20PCI_AD17PCI_AD27PCI_TRDYBPCI_CBE01PCI_AD15PCI_AD09PCI_INT

_1

DVO_CL

SPDIF_I

K_POS

N_P

DVO_CL

SPDIF_I

K_NEG

N_N

DVO_VS

YNC

DVO_HS

YNC

SGPIO_06AUD_SP

SGPIO_0712S_DA

SPDIF_A

SPDIF_A

VDD2P5

VSS

POD_PS

POD_PS

_DATA_

PCI_RE

Q2B

VDDO GND

VDDO VDDO VDDO VDDO VDDO

_DATA_

1

7

PCI_AD31PCI_AD16PCI_AD23PCI_DE

PCI_AD19PCI_AD26PCI_CBE

PCI_AD25PCI_CBE03PCI_SERRBPCI_AD11PCI_INT

VDDO

8

PCI_IRDYBPCI_PERRBPCI_CBE00PCI_AD1

MEB

AUD_RI

GHT_P

AUD_RI

GHT_N

AUD_RV
DDO3P3

AUD_RV

SSO

DIF

TA_OUT

GND VDDO

02

PCI_STO

PB

AUD_LE

VDAC0_0VDAC_B

FT_N

AUD_LE

VDAC0_3VDAC_R

FT_P

AUD_LV

VDAC0_

DDO3P3

AUD_LV

VDAC0_2VDAC_A

SSO

12S_LR_

VDAC_A

OUT

12S_CLK

VDAC_A

_OUT

VDAC_A

VDD3P3

PCI_AD13PCI_AD0

VSELB

PCI_AD1

PCI_PAR

PCI_AD14PCI_AD07PCI_AD06PCI_VIO_2PCI_INT

VDDO

VSS

VSS

1

2

0

GVSS

BIAS

VDAC_B
GVDD1P

2

VDD2P5

VDAC_D

VSS

VDAC_D

VDD1P2

VDAC_A

VDD3P3

8

PCI_AD0

3

_A1

_A0

GND VDDO

GPIO_41GPIO_04

GPIO_40GPIO_03

GPIO_12GPIO_02

GPIO_36GPIO_42

GPIO_38GPIO_01 GPIO_45 GND

GPIO_37GPIO_00 GPIO_44

GPIO_39 VDDO

EBI_CS3BEBI_TSI

VDDP

GND

PCI_AD04EBI_RDBEBI_WE

PCI_AD05PCI_GN

HDMI_D

HDMII_

HDMI_D

ATA_0_

ATA_1_P

HDMI_D

HDMI_D

ATA_1_

ATA_0_P

N

HDMI_D

HDMI_C

ATA_2_

LK_P

N

HDMI_D

HDMI_C

ATA_2_P

LK_N

DVOPLL
_AVDD1

DVOPLL

GND

_AVSS

GND GND GPIO_14 GPIO_15GPIO_20 GPIO_26GPIO_34

ZE1B

EBI_RWBEJTAG_

EBI_CS0BEBI_TABEJTAG_

PCI_INT

GPIO_59 RESETBGPIO_13 GPIO_16GPIO_21 GPIO_27GPIO_49

TCK

TMS

EBI_TSB

1B

EBI_CS1BEBI_CS4BEBI_DSBEJTAG_

VDDO

T0B

PCI_AD02PCI_RE

_A2

PCI_AD01PCI_AD00PCI_GN

_A3

HDMII_

N

P2

Q0B

HTPLG_

HDMII_

HTPLG_I

HDMII_
DDC_SD

HDMI_R
XVDD3P

HDMI_A

HDMI_R

ESREF

HDMI_P
LL_AVD

SD_AVD

OB_AVSSOB_AVD

CLK54_

AVSS

EDSAFE
_ADCD_

GPIO_57GPIO_61

EBI_AD

DR24

PCI_RE

12S_CLK

DDC_SC

OUT

L

12S_LR_

GPIO_43

IN

N

12S_DA

HD_DVI_3HD_DVI

TA_IN

A

HDMII_

HD_DVI_2HD_DVI_6HD_DVI

CEC

3

HDMI_R

HD_DVI

XVDD2P

VSS

5

HDMI_R

HD_DVI_8HD_DVI

XVDD1P

2

HD_DVI

VDDO

_HSYNC

D1P2

SD_AVD

SD_AVD

SD_AVD

D_AFE2

P5

SD_AGNDSD_AVD

D1P2

OB_DVSSOB_AVD

D1P2

EDSAFE

EDSAFE

_PLLGN

D

EDSAFE

EDSAFE

_AVDD2

_AGND

GND

BYP_DS

SGPIO_02SGPIO_03AGC_VDDOSGPIO_04EDSAFE

BSC_S_SCLBSC_S_S

EJTAG_

GPIO_58

TDO

EBI_WE0BEBI_TA2BEJTAG_

Q1B

EBI_CS2BEBI_TSI

T1B

D_AFE2

_PLLVD

HD_DVI_1HD_DVI_9HD_DVI

_IN

HD_DVI_0HD_DVI

_10

HD_DVI

_11

_4

_VSYNC

GND

VCXO_A

GND

PLL_MA
IN_AGN

D

SD_AVD
D_CLK2

D1P2

P5

SD_AVD
D_CLK2

P5

P5

SD_AGNDOB_DVD

D1P2

D2P5

CLK54_
AVDD2P

D1P2

5

EDSAFE
_AVDD1

P5

P2

EDSAFE
_AVDDT

_CLK

H1P2

DA

RESET_

OUTB

IR1_IN GPIO_60 GPIO_17GPIO_23 AD

TDI

TRSTB

ZE0B

_5

VDDO

_7

HD_DVI

HD_DVI

_CLK_P

_DE

VCXO27_BANT_RX

_CLK_N

BYP_SY

GND

S108_CL

K

ANT_DETANT_TX

_DATA

PLL_MA

VCXO_A

IN_AGN

VDD1P2

D

VCXO_A

SD_INC

GND

M_CVBS

NO_CON

SD_PB SD_PR J

NECT

SD_AGN

SD_Y

D

SD_INC

SD_C

M_LC

OB_IFV

D1P2

CO_N

CLK54_

OB_I_N OB_I_P N

AVDD1P

2

EDSAFE

CLK54_

_ADCD_

XTAL_N

VDD1P2

EDSAFE

EDSAFE

_CLKVD

_VCM_0

D2P5

EDSAFE

EDSAFE

_ADCVD

_VCM_1

D2P5

_IF_N

DS_AGC

NO_CON

I_CTL

NECT

SGPIO_01SGPIO_0

VDDP GPIO_28GPIO_33 AB

NMIB GPIO_22 GPIO_32 AC

IR_OUT IR2_IN GPIO_18 AE

EBI_AD

VDDO GND AF

DR25

GND A

BYP_SY
S9_CLK

VCXO27

_A

_DATA

PLL_MA

IN_AVD

D1P2

PLLTES
T_MAIN

GND G

SD_CVB

S

SD_INC
M_COMPK

SD_L L

OB_IFV

CO_P

CLK54_
XTAL_P

EDSAFE

_CVBS_

0

EDSAFE

_CVBS_

1

EDSAFE

_IF_P

NO_CON

NECT

DS_AGC

T_CTL

5

SGPIO_0

0

B

C

D

E

F

H

M

P

R

T

U

V

W

Y

AA

42

--MEMO--

LC-20D42U

43

LC-20D42U

Disclete LPF

IC1301

I/O
M62320
<MUTE>

IC1404

CODEC AK4683

IC8101

IXB870WJQZ

MAIN

I2C0

PCI/LOCAL BUS

SPDIF
Digital Audio

UART

SP

P2703(4p)

IC8454
EEPROM

BR24L64F

I2CEXT

HDMI 2

P9005

BUS Connecter

USB

IF

DTV_HDMI/I2S

DTV/SPDIF

SIF

IN1

IC2701

Digital AMP

TPA3101D

SP_L/SP_R

DTV_SPDIF

Tuner L/R

IN2

IN3

RX0

OUT1

OUT2

SDTOA

SDTIA2

SDTIA3

TX

HDMI 1

24-bit Digital

D3.3V

D2.6V

Y

C

RGB 24 bit

CK,HD,VD,DE

RF IN

DIF

AGC

RGB

RGB_LR

OPTICAL

OUT

IC1507

TMDS

Selector

TMDS341A

TUN_I2C

IN4

IC8452

NOR FLASH

64Mb

CVBS

RX_x8

RX_x8

RGB

I2C_0

I2C_1

(100KHz)

3.3V

HD,VD

D3.3V

IC1401

Voice

multiplex

decoder
AN5832SA

AFT

RGBAudio

(Mini Plug)

INPUT

6

4

5

6

RX1

SDTIB

EEPROM

RESET

To CPLD

A_OUT_SW

DTV_SPIDF

DTV_I2S

IC1104

DAC

M62332FP

I2C1

(100KHz)

5V

+5V

GAIN

EA[23:1

Tuner I2C

IF_AGC

D1.2V

Analog RGB

HD,VD

Digital IN
DVIDATA[23:0]
DVICLK
DVIHSYNC
DVIVSYNC
DVIDE

DS_AGCI_CTL

Digital Out
DVO DATA[23:0]
DVOCLK0
DVOCLK1
DVODE
DVOHSYNC
DVOVSYNC
DVODE

EDSAFE_CVBS_0

SD_L

SD_CVBS

FCLK

CVBS

SD_PB

SD_PR

SD_C

TMDS_SEL_D[2:0]

TMDS_SEL_CLK

HDMI_DATA[2:0]

HDMI_CLK

IC3304

RGB ADC

Mstar

3ch 10bit
ADC
(2mux/ch)
108MHz
1080i

85.5MHz
WXGA

HDMI_I2C

I2S_IN

I2S_OUT

X3301

14.318MHz

SD_Y

Y

Cb

Cr

+3.3V
+2.5V

IC1103

AMP

I2C_2

(400KHz)

3.3V

IC8451
EEPROM
B979WJ

EEPROM

D5V

D5V

A5V

D3.3V

+5V

D5V

D5V

A5V
D3.3V

UR6V

D3.3V

D3.3V

33

I2C_BSC

UART

CVBS

HDMI_L/R

HDMI Audio

5

EEPROM

D5V

IC1504

1ShotMulti

VD

To M16

UART

P9301

Connector for

software

writing

I/O

EDSAFE_IF_P
EDSAFE_IF_N

EDSAFE_CVBS_1

1ch 12bit
ADC
(3mux/1ch)
108MHz
1080i

BU5V

Audio

Out

L/R

A9V

CVBS

CVBS

L/R

CVBS

S

IC501

AV SWITCH

MM3151XQ

Monitor
Out

TV
Main
Out

Video3

Video1

Video2

CVBS

S Video

2

3

1

L/R

L/R

IC1407

SOUND DSP

TAS3108D

IC1405

Analog SW

D2.6

Port(OUT)

SC8401

USB

IC8401

Power

+UR6V

Component

CVBS/LR

YPbPr

IC1402
EEPROM
B991WJ

TU1101

Analog/Digital

Tuner

+5V

LR

CVBS/LR

+12V
+5V

MOBILE Audio_LR

IN5

30MHz

7MHz

7MHz

7MHz

7MHz

30MHz

30MHz

BLOCK DIAGRAM

H

G

E

D

C

B

F

A

87109654321

44

LV P2601

(32p FFC)

UART

AC

80 FFC

Inverter

POWER

MENU

INPUT

CH-UP/DOWN

VOL-UP/DOWN

KEY

KM

(P2002 4p)

LCD

CN2
(10p)

PNL+5V

LB P2603

(5pin )

+24V

PNL+5V

KEY1,KEY2

PS_ON/AC_CTRL

SH P2602

(7pin )

AC_DET

PD

P9701(12PIN)

RA P101(15p)

LED

OPC_LED,POW_LED_R,POW_LED_G

R/C
OPC
LED

USB

24-bit Digital

R/C

R/L,U/D

Power

MAIN

A9V
A5V

D5V
D3.3V
D2.6V
D1.2V

IC9101

CPLD

B860WJ

D3.3V

DET_PNL5V,DET_10V,DET_6V

LED(3)

STBY_POW

CN103

(14pin )

BU+3.3V

BU+5V

OPC

R/C

+12V

BackUp

BU+3.3V

D_POW,PNL5V_ON

RESET

54.000MHz

RA (P502 15p)

BU+3.3V

EA[23:1] ED[15:0]

ut
TA[23:0]

X8101
X'tal
54MHz

FCLK

IC2002

CPU
M16

BU+3.3V

X2001
X'tal

I2C

A/D(2)

A/D

A/D

INT0

PM_REQ

SRESET

CBOOTS

20MHz

IC2001

Reset

UART

TEMP[3:0],O/S_SET,FRAME

TH2001

Thermister

Von

I2C

AC_DET

Vbrt

THERMO

SW

SW

IC8301

IC8302
DDR-SDRAM
256Mbit*2

DDR-400

AFT

33.0MHz

RESET

INT

SRESET

RESET

I2C_BSC

I/O

I/0
32KHz
X'tal

32.728KHz

I/O

I/O

P9201

Board Config

SC8401

USB

IC8401

Power

+UR6V

Mobile

Audio

Board Config

Wire

Detect

5V_REG

BU+3.3V

BackUP

C

IC2005

DAC

M62332FP

IC2602

LVDS Tx

VHIV385AGLF-1Y

$0.51

D3.3V

IC2004

EEPROM

BR24L08F

D3.3V

BU+3.3V

BU+3.3V

+2.6V

BU+5V

LC-20D42U

45

1716 1918151413121110

LC-20D42U

P2002P2002

P2703P2703

MAIN UNITMAIN UNIT

QCNW-F193WJQZ QCNW-F193WJQZ

LC-20D42ULC-20D42U

OVERALL WIRING DIAGRAMO V E R A L L W I R I N G D I A G R A M

P151P151

KEY UNITKEY UNIT

1 4

P502P502

QCNW-F723WJPZ QCNW-F723WJPZ

QCNW-F727WJQZ QCNW-F727WJQZ

QCNW-F726WJQZ QCNW-F726WJQZ

QCNW-F724WJQZ QCNW-F724WJQZ

QCNW-F206WJQZ QCNW-F206WJQZ

J1501J1501

J507J507

J509J509

J505J505

J501J501

SC1503SC1503

D1306D1306

J1502J1502

SC1501SC1501

SC8401SC8401

SC1502SC1502

1 4

1 4

1 15

P2602P2602

P9701P9701

P2603P2603

P2601P2601

1 12

1 5

1 7

1 32

CN1

CN2

LCD CONTROL UNIT

POWER
UNIT

CN1CN1

1 12

P101P101

LED UNITLED UNIT

15 1

1

2

3

5

6

7

OVERALL WIRING DIAGRAM

H

G

F

E

D

C

B

A

46

87109654321

LC-20D42U

INVERTERINVERTER
UNITUNIT

CN103CN103

QCNW-F725WJQZ QCNW-F725WJQZ

To LAMP

To LAMP

To LAMP

To LAMP

To LAMP

80

80

CN1CN1

CN2CN2

LCD CONTROL UNITLCD CONTROL UNIT

1 7

1 32

1 14

POWERPOWER
UNITUNIT

CN1CN1

AC INAC IN

CN2CN2

1 12

1 10

4

1716 1918151413121110

47

LC-20D42U

DESCRIPTION OF SCHEMATIC DIAGRAM

VOLTAGE MEASUREMENT CONDITION:

1. The voltages at test points are measured on the
stable supply voltage of AC 120V. Signals are fed
by a color bar signal generator for servicing purpose
and the above voltages are measured with a 20k
ohm/V tester.

INDICATION OF RESISTOR &
CAPACITOR:

RESISTOR

1. The unit of resistance “Ω” is omitted.
(K=kΩ=1000 Ω, M=MΩ).

2. All resistors are ± 5%, unless otherwise noted.
(K= ± 10%, F= ± 1%, D= ± 0.5%)

3. All resistors are 1/16W, unless otherwise noted.

CAPACITOR

1. All capacitors are µF, unless otherwise noted.
(P=pF=µµF).

2. All capacitors are 50V, unless otherwise noted.

CAUTION:

This circuit diagram is original one, therefore there may be a
slight difference from yours.

SAFETY NOTES:

1.DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACING PARTS.

2.SEMICONDUCTOR HEAT SINKS SHOULD BE
REGARDED AS POTENTIAL SHOCK HAZARDS
WHEN THE CHASSIS IS OPERATING.

IMPORTANT SAFETY NOTICE:

PARTS MARKED WITH “å” ( ) ARE
IMPORTANT FOR MAINTAINING THE SAFETY OF
THE SET. BE SURE TO REPLACE THESE PARTS
WITH SPECIFIED ONES FOR MAINTAINING THE
SAFETY AND PERFORMANCE OF THE SET.

AVIS DE SECURITE IMPORTANT:

LES PIECES MARQUEES “å” ( )SONT
IMPORTANTES POUR MAINTENIR LA SECURITE
DE L'APPAREIL.
NE REMPLACER CES PIEDES QUE PAR DES
PIECES DONT LE NUMERO EST SPECIFIE POUR
MAINTENIR LA SECURITE ET PROTEGER LE BON
FONCTIONNEMENT DE L'APPAREIL.

Note: MAIN 14,15 does not use it.

48

SCHEMATIC DIAGRAM

Ë

LED Unit

H

G

F

LC-20D42U

E

D

C

B

A

654321

49

LC-20D42U

Ë

MAIN Unit-1/20

H

G

F

E

D

C

B

A

87109654321

50

LC-20D42U

51

1716 1918151413121110

LC-20D42U

Ë

MAIN Unit-2/20

H

G

F

E

D

C

B

A

87109654321

52

LC-20D42U

53

1716 1918151413121110

LC-20D42U

Ë

MAIN Unit-3/20

H

G

F

E

D

C

B

A

87109654321

54

LC-20D42U

55

1716 1918151413121110

LC-20D42U

Ë

MAIN Unit-4/20

H

G

F

E

D

C

B

A

87109654321

56

LC-20D42U

57

1716 1918151413121110

LC-20D42U

Ë

MAIN Unit-5 /20

H

G

F

E

D

C

B

A

87109654321

58

LC-20D42U

59

1716 1918151413121110

LC-20D42U

Ë

MAIN Unit-6 /20

H

G

F

E

D

C

B

A

87109654321

60

LC-20D42U

61

1716 1918151413121110

LC-20D42U

Ë

MAIN Unit-7 /20

H

G

F

E

D

C

B

A

87109654321

62

LC-20D42U

63

1716 1918151413121110

LC-20D42U

Ë

MAIN Unit-8 /20

H

G

F

E

D

C

B

A

87109654321

64

LC-20D42U

65

1716 1918151413121110

LC-20D42U

Ë

MAIN Unit-9 /20

H

G

F

E

D

C

B

A

87109654321

66

LC-20D42U

67

1716 1918151413121110

LC-20D42U

Ë

H

G

F

MAIN Unit-10 /20

E

D

C

B

A

87109654321

68

LC-20D42U

69

1716 1918151413121110

LC-20D42U

Ë

H

G

F

MAIN Unit-11 /20

E

D

C

B

A

87109654321

70

LC-20D42U

71

1716 1918151413121110

LC-20D42U

Ë

H

G

F

MAIN Unit-12 /20

E

D

C

B

A

87109654321

72

LC-20D42U

73

1716 1918151413121110

LC-20D42U

Ë

MAIN Unit-13/20

H

G

F

E

D

C

B

A

87109654321

74

LC-20D42U

75

1716 1918151413121110

LC-20D42U

Ë

H

G

F

MAIN Unit-14 /20

E

D

C

B

A

87109654321

76

LC-20D42U

77

1716 1918151413121110

LC-20D42U

Ë

H

G

F

MAIN Unit-15 /20

E

D

C

B

A

87109654321

78

LC-20D42U

79

1716 1918151413121110

LC-20D42U

Ë

H

G

F

MAIN Unit-16 /20

E

D

C

B

A

87109654321

80

LC-20D42U

81

1716 1918151413121110

LC-20D42U

Ë

H

G

F

MAIN Unit-17 /20

E

D

C

B

A

87109654321

82

LC-20D42U

83

1716 1918151413121110

LC-20D42U

Ë

H

G

F

MAIN Unit-18 /20

E

D

C

B

A

87109654321

84

LC-20D42U

85

1716 1918151413121110

LC-20D42U

Ë

H

G

F

MAIN Unit-19/20

E

D

C

B

A

87109654321

86

LC-20D42U

87

1716 1918151413121110

LC-20D42U

Ë

MAIN Unit-20/20

H

G

F

E

D

C

B

A

87109654321

88

LC-20D42U

89

1716 1918151413121110

LC-20D42U

Ë

H

G

F

KEY Unit

E

D

C

B

A

87109654321

90

LC-20D42U

91

1716 1918151413121110

LC-20D42U

PRINTED WIRING BOARD ASSEMBLIES

H

G

LED Unit (Side-A)

F

E

D

LED Unit (Chip Parts Side-A)

C

B

A

LED Unit (Side-B)

87109654321

92

LC-20D42U

93

1716 1918151413121110

LC-20D42U

H

G

F

E

D

C

B

A

MAIN Unit (Side-A)

87109654321

94

LC-20D42U

95

1716 1918151413121110

LC-20D42U

H

G

F

E

D

C

B

A

MAIN Unit (Chip Parts Side-A)

87109654321

96

LC-20D42U

97

1716 1918151413121110

LC-20D42U

H

G

F

E

D

C

B

A

MAIN Unit (Side-B)

87109654321

98

LC-20D42U

99

1716 1918151413121110

LC-20D42U

H

G

F

E

D

C

B

A

MAIN Unit (Chip Parts Side-B)

87109654321

100