Sharp LC-20E1UW Schematic

LC-20E1U
LC-20E1UB/UW

SERVICE MANUAL

S72M5LC-20E1U

LCD COLOR TELEVISION

LC-20E1U

MODELS

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.

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

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

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

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

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

» ADJUSTING PROCEDURE OF EACH SECTION ................................................................................ 14

» TROUBLE SHOOTING TABLE ............................................................................................................. 26

» CHASSIS LAYOUT ................................................................................................................................ 30

» BLOCK DIAGRAM................................................................................................................................. 32

» OVERALL WIRING DIAGRAM .............................................................................................................. 34

» DESCRIPTION OF SCHEMATIC DIAGRAM ........................................................................................ 36

» SCHEMATIC DIAGRAM ........................................................................................................................ 37

» PRINTED WIRING BOARD ASSEMBLIES........................................................................................... 54

» REPLACEMENT PARTS LIST .............................................................................................................. 66

» PACKING OF THE SET......................................................................................................................... 79

LC-20E1UB/UW

CONTENTS

Page

SHARP CORPORATION

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

LC-20E1U

2

2

LC-20E1UB/UW

IMPORTANT SERVICE SAFETY PRECAUTION

Ë

Service work should be perfomed 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 ONL Y WITH SAME
TYPE F3701 (2.0A, 125V), F3702
(1.6A, 125V), F6700 (1.0A, 125V),

A V

F6701 (1.0A, 125V), F6702 (1.0A,
125V), F6703 (1.0A, 125V) AND
F6704 (1.0A, 125V) FUSE.

BEFORE RETURNING THE RECEIVER
(Fire & Shock Hazard)

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

1. 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.

2. 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.

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

• Plug the AC cord directly into a 110~240 volt AC outlet,
and connect the DC power cable into the receiver's
DC jack. (Do not use an isolation transformer for this
test).

• Using two clip leads, connect a 50k ohm, 10 watt
resistor paralleled by a 0.15µF 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.

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

• 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 0.75V peak (this corresponds to 0.5
milliamp. peak AC.) or more is excessive and indicates
a potential shock hazard which must be corrected
before returning the monitor to the owner.

DVM

AC SCALE

50k ohm

10W

0.15 µF

TEST PROBE

TO EXPOSED
METAL PARTS

CONNECT TO
KNOWN EARTH
GROUND

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SAFETY NOTICE

Many electrical and mechanical parts in LCD 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

and shaded areas in the

Schematic Diagrams

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.

components having such features are identified by “ å”

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2

Replacement Parts Lists

.

and

LC-20E1U

2

2

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LC-20E1UB/UW

PRECAUTIONS A PRENDRE LORS DE LA REPARATION

Ë

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

AVERTISSEMENT

conduite électrique ou une prise de terre branchée à la
terre.

1. N'entreprendre aucune modification de tout circuit.
C'est dangereux.

2. Débrancher le récepteur avant toute réparation.

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

• Toucher avec la sonde d'essai les pièces métalliques

A V

PRECAUTION: POUR LA

PROTECTION CONTINUE CONTRE
LES RISQUES D'INCENDIE,
REMPLACER LE FUSIBLE PAR UN
FUSIBLE DE MEME TYPE F3701
(2.0A, 125V), F3702 (1.6A, 125V),
F6700(1.0A, 125V), F6701(1.0A, 125V),
F6702(1.0A, 125V), F6703(1.0A, 125V),
F6704(1.0A, 125V).

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.
T outes 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.)
Tous les courants mesurés ne doivent pas dépasser
0,5 mA.

VERIFICA TIONS CONTRE L'INCEN-DIE ET
LE CHOC ELECTRIQUE

Dans le cas contraire, il y a une possibilité de choc
électrique qui doit être supprimée avant de rendre le
récepteur au client.

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

1. 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.

2. 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

VTVM

ECHELLE CA

50k ohm

10W

et de compartiment, les réseaux de résistance­capacité, les isolateurs mécaniques, etc.

3. S'assurer qu'il n'y ait pas de danger d'électrocution en
vérifiant la fuite de courant, de la facon suivante:

• Brancher le cordon d'alimentation directem-ent à une

0.15 µF

SONDE D'ESSAI

prise de courant de 110-240V. (Ne pas utiliser de
transformateur d'isolation pour cet essai).

• A l'aide de deux fils à pinces, brancher une résistance
de 50 kΩ 10 watts en parallèle avec un condensateur
de 0,15µF en série avec toutes les pièces métalliques
exposées du coffret et une terre connue comme une

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234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121

AUX PIECES
METALLIQUES
EXPOSEES

BRANCHER A UNE
TERRE CONNUE

AVIS POUR LA SECURITE

De nombreuses pièces, électriques et mécaniques,
dans les téléviseurs 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

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identifiées par la marque " å " et hachurées dans la
liste des pièces de remplacement et les diagrammes
schématiques.
Pour assurer la protection, ces pièces doivent être
identiques à celles utilisées dans le circuit d'origine.
L'utilisation de pièces qui n'ont pas les mêmes
caractéristiques que les pièces recommandées par
l'usine, indiquées dans ce manuel, peut provoquer des
électrocutions, incendies, radiations X ou autres
accidents.

3

LC-20E1U
LC-20E1UB/UW

Precautions for using lead-free solder

1 Employing lead-free solder

"All 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:

L Fa

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

2 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 40ºC, we recommend
you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or soldening
bit, contact our service station or service ranch in your area.

3 Soldering

As the melting point of lead-free solder (Sn-Ag-Cu) is about 220°C which is higher than the conventional lead
solder by 40°C, and as it has poor solder wettabillty, 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 excoeded, remove the bit from the PWB as soon as you conurm the steady soldering
condition.
Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to tum 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.

Becareful when replacing parts with polarity indication on the PWB silk.

Lead-free wire solder for servicing

Part No, ★ Description Code
ZHNDAi123250E J φ0.3mm 250g(1roll) BL
ZHNDAi126500E J φ0.6mm 500g(1roll) BK
ZHNDAi12801KE J φ1.0mm 1kg(1roll) BM

4

SPECIFICATIONS

LC-20E1U
LC-20E1UB/UW

Items

LCD panel 19.7” ASV & BLACK-TFT LCD
Number of dots 921,600 dots VGA
Video color systems N358, N443, PAL, PAL-M, PAL-N, SECAM, PAL-60

Destination USA/Latin A/Twn
TV Standard (CCIR) NTSC/PAL-M/PAL-N

TV function TV Tuning System PLL 181 ch.

STEREO MTS+SAP

CATV 125 ch.
3 Dimensional Y/C separation circuit Yes (N358 only)
Digital comb filter Yes
Brightness 430 cd/m
Lamp life 60,000 hours
Viewing angles H: 170° V: 170°
Audio amplifier 2.5 W × 2
Speakers 1 37/64× 23/4 in. (4 × 7 cm), 2 pcs.

AV1 AV-IN1, S-VIDEO-IN

AV2 AV-IN2/AV-OUT
Terminals COMPONENT COMPONENT-IN, AUDIO-IN

Antenna F-Type

Headphone Mini-jack for stereo (ø 3.5 mm)
OSD language English/French/Spanish
Power

supply DC
Weight 15.7 lbs (7.1 kg), w/o accessories
Accessories Remote control, Batteries, Antenna cable, AC adapter,

Environmental Conditions

Model

2

13 V, AC 110–240 V, 50/60 Hz

AC cord, Cable clamp, Operation Manual
0°C~40°C

LC-20E1U

Specifications are subject to change without prior notice.

5

LC-20E1U

• TV/VIDEO, CH (

)/(

), VOL (–)/(+), and MENU on the main unit have the same functions as the same buttons

on the remote control. Basically, this operation manual provides a description based on operation with the remote

control.

FRONT AND REAR CONTROL OPTIONS

Main unit (front view)

CHVOL

MENU

MAIN POWERTV/VIDEO

MAIN POWER

TV/VIDEO

MENU

CH (

)/( )

VOL (–)/(+)

Speaker

SLEEP indicator

The SLEEP indicator lights up red when

the SLEEP TIMER is set to on.

Upper control panel

Remote sensor window

The screen can be

adjusted backwards to an

angle between 12

degrees and 35 degrees.

The screen cannot be set

up straight. When

changing the angle, make

sure to hold the stand and

adjust the screen to the

best viewable angle.

POWER indicator

A green indicator lights when the power is on and a red indicator lights

when in the standby mode (the indicator will not light when the main

power is off).

Adjustable

range

AV

-

I

N

1

L

R

A

U

D

I

O

S

-

VI

D

E

O

A

N

T.

V

I

D

E

O

P

O

W

E

R

I

N

P

U

T

D

C

1

3

V

HE

A

D

P

H

O

N

E

Y

P

B

CO

M

PO

N

E

N

T

P

R

L

L

R

A

V

-

I

N

2

/

O

U

T

V

I

D

E

O

A

U

D

I

O

R

A

U

D

I

O

V

I

D

E

O

A

U

D

I

O

L

Y

P

B

P

R

R

A

U

DI

O

L

R

C

O

M

PO

N

E

N

T

A

V-I

N

2

/

O

U

T

A

N

T

.

V

ID

EO

S

-VIDE

O

A

U

D

IO

L

R

H

E

A

D

P

H

O

N

E

P

O

W

E

R

IN

P

U

T

D

C

1

3

V

AV

-IN1

Main unit (rear view)

Antenna terminal

AUDIO (L)

AUDIO (R)

HEADPHONE

POWER INPUT

(DC 13V)

AUDIO (L)

AUDIO (R)

VIDEO

Y

P

R

P

B

AV-IN2/OUT

COMPONENT

AUDIO (L)

AUDIO (R)

VIDEO

S-VIDEO

AV-IN1

Carrying handle

LC-20E1UB/UW

OPERATION MANUAL

6

Listening with Headphones

FRONT AND REAR CONTROL OPTIONS (Continued)

Ë

Before connecting a connection cord into the rear terminal, remove the

back cover. Push in the tab and pull out the back cover carefully.

Ë

To mount the cover, insert the 2 hooks on the bottom of the cover

into the cabinet and press on the upper part of the back cover until

the tab locks in place with a click.

Removing the Back Cover

ËPlug the headphone mini-plug into the HEADPHONE jack located on the rear of the TV set.

Headphones

• Headphones are not included in the supplied accessories.

• No sound will be heard from the main unit speakers when a headphone mini-plug is connected into the

HEADPHONE jack.

On-screen display

60

VOLUME

\

\

Rear terminal

A

V

-

I

N

1

L

R

A

U

D

I

O

S

-

VI

D

E

O

AN

T

.
VI

D

EO

PO

W

E

R

I

N

P

U

T

D

C

1

3

V

H

E

A

D

P

H

O

N

E

A

V

-

I

N

1

L

R

A

U

D

I

O

S

-

V

I

D

E

O

A

N

T

.
V

I

D

E

O

P

O

W

E

R

I

N

P

U

T

D

C

1

2

V

H

E

A

D

P

HO

NE

Y

P

B

C

O

M

P

O

N

E

N

T

P

R

L

L

R

A

V

-

IN

2

/O

U

T

V

IDE

O

A

U

D

I

O

R

A

U

D

I

O

CHVOL

POWER

MENU

DISPLAY

MUTE

SLEEP PIC. FLIP

BRIGHT CC TV/VIDEO

FLASHBACK

REMOTE CONTROL

MENU/

/ / / (Cursor control)

TV/VIDEO

POWER

DISPLAY*

1

SLEEP

BRIGHT

VOL(+)/(–)

MTS*

3

PIC. FLIP

FLASHBACK*

2

CH (

)/(

)

Channel Select

*

1

Displays the receiving chan-

nel for 10 seconds.

*

2

Returns to the previous

channel.

*

3

Selects audio settings.

CC (CLOSED CAPTION)

MUTE

\

\

\

\

LC-20E1U
LC-20E1UB/UW

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LC-20E1U

CONNECTING WITH EXTERNAL DEVICES

You can enjoy picture and sound by connecting a VCR or a home video game system to the terminals

located on the rear of the TV set.

When connecting an external device, turn off the power of the main unit first to prevent any possible

damage.

<Example>

• Video camera

• Home video game system

External devices that can be connected

to COMPONENT terminal

• PC connection is not possible.

• For the cable, use a commercially available audio/video cable.

• Only connect audio/video signals to AV-IN1 and 2 terminals. Connecting other signals may result in a malfunction.

• AV-IN1 has 2 video input terminals: VIDEO and S-VIDEO. When you connect external devices to both terminals

(and if you select AV-IN1), you can only view pictures from the S-VIDEO terminal. To view the picture from the

VIDEO terminal, do not connect any external device to the S-VIDEO terminal.

• For more information about external device connections, see the manuals of your external devices.

A

V

-

I

N

1

L

R

A

U

D

I

O

S

-

V

I

DE

O

A

N

T.

V

I

D

E

O

P

O

W

E

R

I

N

P

U

T

D

C

1

3

V

HE

A

D

P

H

O

N

E

Y

P

B

C

O

M

P

O

N

E

N

T

P

R

L

L

R

A

V

-

I

N

2

/

O

U

T

V

I

D

E

O

AU

DI

O

R

AU

DI

O

TUNER/BAND

DVD

AUX 1

AUX 3

AUX 2

SURROUND

ON/OFF

TUNER/BAND

DVD

AUX 1

AUX 3

AUX 2

SURROUND

ON/OFF

Example of external devices that can be connected

External devices that can be connected

to AV-IN2 terminal

* If your external device has a component

terminal, COMPONENT connection is

recommended (you can view high-quality

pictures).

<Example>

• DVD, etc.

<Example>

• VCR

• Laser disc player

* If your external device has an S-Video terminal,

S-VIDEO connection is recommended.

External devices that can be connected

to AV-IN1 terminal

M

ENU

SLEEP T I

M

ER

VIDEO ADJUST

PRESE T

CLOSED CAPT ION

V–CHI P BLOCK

SET UP

SELECT :

ENTER:

EXIT:

MENU

SLEEP T I

M

ER

SELECT :

ADJU ST :

EXI T :

MENU

RETURN

SLEEP T I

M

ER [–– – RE

M

AIN]

PICTURE [ 30]

TINT

COLOR

BLACK LEVEL

SHARPNESS

SELECT :

ENTER:

EXI T :

MENU

VI DEO ADJUST(TV)

RETURN

[ 0]

[ 0]

[ 0]

[ 0]

BRI GHTNESS [BR I GHT ]

AUTO PO

W

ER OFF

PICTURE FLIP

AV2 IN/OUT

SELECT :

EXI T :

MENU

RETURN

[OFF ]

OR

M

AL ]

[IN ]

PRESE T

ADJU ST :

CC/ T EXT

[OFF]

SELECT :

EXIT:

MENU

RETURN

ADJU ST :

CLOSED CAPT ION

INPUT SECRET NO.

––––

EXI T :

MENU

BLUE SCREEN [ OFF]

LANGUAGE

SELECT :

EXIT:

MENU

RETURN

ADJU ST :

SET UP

CH–SE TT I NG

COLOR SYST EM

RESET

[ N 35 8 ]

SELECTING MENU ITEMS

• This LCD TV set allows you to adjust the various settings using the menu screen. Select the desired

menu item by following the steps below and then refer to the indicated page for details.

1

Press MENU to display the MENU

screen.

2

Press

/

to select the desired

menu item.

3

Press

/

to enter.

4

Press MENU to exit.

• The TINT display only appears when

the color system is set to N358 or

N443.

• The displayed items differ depending

on the setting conditions.

• The selected item changes to yellow.

• Items in magenta cannot be se-

lected.

• This product is factory set to comply

with the color system in the United

States (NTSC-N358). For Brazil

(PAL-M), Argentina (PAL-N) and

Uruguay (PAL-N), set the color

system before using this product.

• To return to the previous screen,

select RETURN.

• You can adjust some settings with

the special buttons: CC, PIC. FLIP,

SLEEP and BRIGHT

Selecting Menu Items

CHVOL

P

O

W

E

R

MENU

DISPLAY

MUTE

SLEEP PIC. FLIP

BRIGHT CC TV/VIDEO

FLASHBACK

* The screen indications shown above are larger than actual for easy reading.

MENU/

/

/

/

LC-20E1UB/UW

8

LC-20E1U
LC-20E1UB/UW

DIMENSIONS

Unit: inch/(mm)

MENU

MAIN POWERTV/VIDEO

CHVOL

(68)

64

/

43

2

1913/32(493)

315/16(100)

POWER SLEEP

(244)

64

/

39

9

(5)

16

/

3

0

(440)

64

/

21

17

43/64(103)

243/64(68)

75/32(182)

(187)

64

/

23

7

(214)

64

/

27

8

AV-IN 2/OUT

COMPONENT

VIDEO

AV-IN 1
L

AUDIO

VIDEO

L

AUDIO

R

Y

P

B

R

P

L

AUDIO

R

R

S-VIDEO

HEAD
PHONE

ANT.

POWER

INPUT
DC13V

(100)

16

/

15

3

(51.5)

64

/

1

2

9

LC-20E1U

Digital

P6705

SC1202

P4004

SC1203

SC2001

SC3403

P6706

P3704

P3602

P3500

P3504

LC-20E1UB/UW

REMOVING OF MAJOR PARTS

1. Remove the table stand fixing screws (4 pcs.).

2. Remove the two terminal covers.

3. Remove the terminal section fixing screws (2 pcs.).

4. Remove the cabinet B fixing screws (10 pcs.).

5. Remove the cabinet B after opening from the direction of an arrow.

6. Remove the reinforcement angle fixing screws (4 pcs.).

7. Remove the top cover fixing screws (2 pcs.).

8. Remove the control PWB fixing screws (2 pcs.).

9. Detach the connector from each PWB.

1

4

Terminal
Cover (S)

3

Stand

4

2

Cabinet A

2

5

4

Cabinet B

Terminal
Cover (L)

6

Reinforcement
Angle

7

9

SC1203

SC1203

9

SC1202

Digital

Digital
PWB

P4004

P4004

SC1201SC1202

9

9

P2004

P2003

SC2001

SC2001

Analog
PWB

P3503

P3601

9

9

P3500

P3500

R/C, LED PWB

8

P3602

P3602

9

SC3403

SC3403

Control PWB

P3703

9

P3702

P3504

P3504

9

P3704

P3704

10

P6705

P6705

P6706

P6706

Inverter-A
PWB

9

9

9

Inverter-B
PWB

10. Remove the inverter-A PWB fixing screws (2 pcs.).

11. Remove the inverter-B PWB fixing screws (1 pc.).

12. Remove the digital PWB fixing screws (3 pcs.).

13. Remove the analog PWB fixing screws (3 pcs.) and detatch the chassis frame cover fixing
hooks.

14. Remove the R/C, LED PWB fixing screws (2 pcs.).

LC-20E1U
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Chassis Frame

12

Digital PWB

Analog PWB

10

11

Inverter-A
PWB

13

Inverter-B
PWB

13

Chassis
Frame Cover

14

13

R/C, LED PWB

11

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» Precautions in handling the LCD panels

1. Work in a clean room (with humidities below 50%).

2. Be sure to wear an anti-static armband.

3. Handle the panels on an electroconductive mat.

4. Be careful not to fall, shake and shock the panels.

15. Remove the LCD panel unit fixing screws (4 pcs.).

16. Remove the ITO earth spring fixing screw (1 pc.).

17. Remove the reflection/deflection, prism, diffusion, ITO sheets and diffusion panel.

18. Remove the lamp fixing holder fixing screws (6 pcs.).

19. Detach the lamp unit-A/B.

20. Remove the reflection mirror fixing screws. (6 pcs.).

Reflection Mirror
(PMiR-0296CEZZ)

Lamp Fixing Holder

(LHLDZ2176CEZZ)
Diffusion Panel
(PCOVU0107CEZZ)

Back shield Panel
(PSLDM4685CEFW)

20

ITO Sheet
(PSHEP0289CEZZ)

Prism Sheet
(PSHEP0287CEZZ)

20" LCD Panel Unit

15

15

18

17

Diffusion Sheet
(PSHEP0288CEZZ)

Reflection/Deflection Sheet
(PSHEP0286CEZZ)

18

16

ITO Earth Spring
(MSPRP1220CEFW)

19

Lamp Unit-A
(KLMP-0124CEZZ)

Lamp Unit-B
(KLMP-0125CEZZ)

Lamp Fixing Holder
(LHLDZ2176CEZZ)

12

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P6705

SC1202

SC1203

SC2001

SC3403

P6706

P3602

P3500

Digital
PWB

LC-20E1UB/UW

Precautions at the time of the side B(back) service of digital unit.

1. Remove only SC2001 of the FFC for connection between Digital unit(SC2001) and Analog unit(SC3403), and
connect the extended cable (QCNW-A556WJZZ) for service.

2. Remove only P2004 of the Connecting Cord for connection between Digita unit(P2004) and Analog unit(P3702),
and connect the extended cable (QCNW-A552WJZZ) for service.

3. Remove the FFC for connection between Digita unit(SC1203) and LCD panel unit, and connect the extended
cable (QCNW-A553WJZZ) for service.

4. Remove the FFC for connection between Digita unit(SC1202) and LCD panel unit, and connect the extended
cable (QCNW-A556WJZZ) for service.

5. Remove the FFC for connection between Digita unit(SC1201) and LCD panel unit, and connect the extended
cable (QCNW-A555WJZZ) for service.

6. Remove the R/C, LED unit.
6-1. Remove a lead from a wire holder.
6-2. Remove the R/C, LED unit fixing screws(2 pcs.).

7. Remove the main unit fixing screws(3 pcs.), a substrate is reversed.

R/C, LED PWB

Digital PWB
(Side B)

4 5

SC1201SC1202

SC1202

Digital

Digital

SC1203

SC1203

PWB

PWB

P2003

3

6-2

P3500

P3500

P2004

2

Analog
PWB

P3503

SC2001

SC2001

P3601

P3602

P3602

1

SC3403

SC3403

P3703

P3702

P3704

P3704

6-1

Inverter-A

P6705

P6705

PWB

P3504P3504

Inverter-B
PWB

P6706

P6706

Wire Holder

13

LC-20E1U
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ADJUSTING PROCEDURE OF EACH SECTION

The best adjustment is made before shipping. If any position deviation is found or after part replace is performed, adjust
as follows.

1.Preparation for Adjustments

(1)Use the exclusive-use AC adapter or stable DC power supply.

AC adapter: UADP-0243CEPZ
DC power supply: 13 ± 0.5V

2.Special mode setting procedure

(1)After initialization of E2PROM the mode is changed to the adjustment mode.

[Procedure]
Connect TP2001 and TP2002 to GND, and turn on the power.

[Description]

» The initialization of microprocessor is as follows.
» AV position, DAC data, G/A data, sound processor data, and video chroma data adjustment values are taken as

defaults.

(2)Adjustment mode

[Procedure]
Short-circuit TP2001 to GND, and turn on the power.
Or short-circuit TP2002 to GND, and turn on the power.
Or holding down the [TV/VIDEO] key and [MENU] key, turn on the main power, and simultaneously press the
(inspection process) [CH "] key and [VOL– ] key to change the mode to the adjustment mode.

[Description]
The manual adjustment or adjustment through communication with the automatic machine is performed.

(3)Shipping setting mode

[Procedure]
Holding down the [TV/VIDEO] key and [MENU] key, turn on the main power, and simultaneously press the
(inspection process) [CH '] key and [VOL+] key to change the mode to the shipping setting mode.
Note: Keep it in mind to turn off the power immediately. If any key-in is accidentally made, the setting will be

canceled.

[Description]
User adjustment and other values are taken as defaults.
If TV is indicated as SETTING COMPLETE, setting has been completed.

3.Cancel of special mode

Turn off the main unit power.

14

4.Adjustments

Page 2 of adjustment process mode

2
| COM BIAS 90

NTSCTAMP 20
PAL-M TAMP 20
PAL-N TAMP 20
RCUTOFF -1
GCUTOFF 0
BCUTOFF -1
G3 B3 R3 00 00 00
G1 B4 Y EF C7 C2
TAMP H CA
TAMP L BB

GAIBU VER0.000

“Y” data
(white 75%)

Adjustment Adjusting conditions Adjusting method

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1 B+ Adjustment

(R3760)

2 Inch Size setup

(If E2PROM is replaced)
(IC2004)

3 Common-bias adjustment

4 TAMP adjustment

1. Connect the DC voltmeter to
pin 2 of P3702.

1. Go to the adjustment mode.

1. Receive a B/W channel.

2. Go to the adjustment mode.

3. Select the "COM BIAS" with
[MENU] key.

1. Receive a half color bar signal in the
TV mode so that the top left zone
should turn white 75% as shown be­low. Other signal can be fed instead
of the half color bar signal, however,
if the point at the vertical 180th line
and horizontal 46th pixel is of white
75%. (Make the adjustment based on
the setting of this point.)

1. Adjust the "B+ Adj" value to

5.0±0.02V with R3760. Make exact
adjustment of the 5.00V level be­cause it will be the reference for all
the other supply voltages. Be sure to
make this adjustment together with
the main PWB (digital PWB). During
the adjustment, be also careful not
to allow the voltage at pin (2) of
P3702 to go above 5.3 V.

1. Select "INCH SIZE" and adjust to
"20" with [VOL+] or [VOL-] key.

* The color of "INCH SIZE" must be

yellow.

1. Adjust "COM BIAS" to the darkest
screen with [VOL+] and [VOL-] key.

* The color of "COM BIAS" must be

yellow.

White 75% at
top left zone

Vertical 180th line and
horizontal 46th pixel

640 pixels

480 lines

5 White balance adjustment

2. Adjust the “NTSC T AMP” setting on
page 2 of adjustment process mode
so that the “Y” reading on the same
page should be BB - CA.

3. Make the same setting for the PAL­M TAMP and PAL-N TAMP data.

1. Receive the monoscope pattern sig­nal.

2. Adjust the “RCUTOFF” and
“BCUTOFF” settings on page 2 of
adjustment process mode to achieve
an optimum white balance.

15

1. Do not change the “GCUTOFF” setting
because otherwise the black level may
fluctuate.

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5.Shipping setting list

Channel............................................................................................................................................... 2ch

Air/Cable ............................................................................................................................................. Air

Skip Data_CATV................................................................................................................................. All Skip

Skip Data_AIR .................................................................................................................................... All Skip

Volume................................................................................................................................................ 20

Picture................................................................................................................................................. 30

Tint ...................................................................................................................................................... 0

Color ................................................................................................................................................... 0

Black Level ......................................................................................................................................... 0

SHARPNESS...................................................................................................................................... 0

RED-BLUE.......................................................................................................................................... 0

GREEN ............................................................................................................................................... 0

TV Color System................................................................................................................................. N358

AV Color System ................................................................................................................................ N358

Language ............................................................................................................................................ English

Blue Screen ........................................................................................................................................ Off

EZ Setup Auto Start............................................................................................................................ On

Sleep Timer ........................................................................................................................................ None

MTS .................................................................................................................................................... Stereo

Brightness........................................................................................................................................... Bright

Auto Power Off ................................................................................................................................... Off

Picture Flip.......................................................................................................................................... Normal

AV2 IN/OUT........................................................................................................................................ In

CC/TEXT............................................................................................................................................. OFF

V Chip block (MPAA)..................................................................................................................... None

(TV Guideline) .......................................................................................................... None

(Block Content) ........................................................................................................ All Unblock

(Status)..................................................................................................................... Off

(Input Secret No.)..................................................................................................... Clear

16

Test patterns in adjustment process mode

[1] IC801 (Video decoder) test patterns

1-1. Getting the test patterns displayed

Put the screen in AV1, AV2 or COMPONENT but keep out any signal. Call the adjustment process mode,
select “TEST PATTERN” in the 3rd line of page 8, make the settings 1 thru 6, and the following test patterns
show up.

1-2. Test patterns

» Setting 1

The color bars are displayed as shown at left.

LC-20E1U
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Yellow

Green

Cyan

Magenta

Green

Red

Blue

greengreen

Yellow

» Setting 2

Finer vertical stripes than Setting 1 are displayed.

» Setting 3

Green

Bright BrightDark

» Setting 4

A rather dark green-only pattern is displayed.

» Setting 5

A half-tone green-only pattern is displayed.

» Setting 6

A rather bright green-only pattern is displayed.

[2] IC1201 (LCD controller) test pattern

2-1. Getting the test pattern displayed

Put the screen in AV1, AV2 or COMPONENT but keep out any signal. Call the adjustment process mode,
select “G/A TEST PATTERN” in the 13th line of page 17, turn on the setting, and the following test pattern
shows up.

2-2. Test pattern

The following test pattern appears.

Cyan

Magenta

The green pattern is displayed as shown at left.

W

h

i

t

e

Dark
Dark
Dark

Black

0-level

gradation

Gray scale

Gray

16-level

gradation

Red

Green

Blue

Gray

32-level

gradation

Bright

Bright
Bright
Bright

Gray

48-level

gradation

DarkDark

Dark
Dark
Dark

White

63-level

gradation

Note: When the IC801 and IC1201 test pattern display commands are both turned on at the same time, the IC1201

test pattern is given priority.

17

LC-20E1U
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Pin functions of microprocessor IC (IC2001) RH-iXA300WJZZQ

No

. Pin name Function
1 V HOLD
2 HLF
3 MAIN SW
4 TIMELED
5 M/S OUT
6 CSYNC
7 IREMI
8 GND
9 GND

10 XCIN
11 XOUT
12 RESET
13 XOUT
14 GND
15 XIN
16 VCC
17 OSCIN
18 OSCOUT
19 PSWIN
20 SUBREADY
21 BLK
22
23 DAC1CS
24 DAC2CS
25 D SW
26 DTV
27 MRDY
28 SCL2
29 SCL1
30 SDA1
31 SDA2
32 R
33 G
34 B
35 SUBD OUT
36 SUBDIN
37 SUBCLK
38
39 MRDY OUT
40 FCH
41 IREM OUT
42 L_ERR
43 S IN/OUT
44 N443
45 PAL
46 SECAM
47 PAL_M
48 N358
49 PXOE
50 VSH OUT

Closed caption
Closed caption
Main switch ON[H]/OFF[L]
Off timer LED light-up
Sub-microprocessor master/slave output
Composite sync signal
Remote control
Grounding
Grounding
32kHz oscillation input
32kHz oscillation output
Reset at “L” level
Microprocessor oscillator connection
Grounding
Microprocessor oscillator connection
Power
OSD clock input
OSD clock output
Main power input
Sub-microprocessor ready input
OSD blanking output

DAC1 chip select
DAC2 chip select
D terminal connection detect
D terminal control line
I2C bus open/closed select input
I2C bus serial clock line 2
I2C bus serial clock line 1
I2C bus serial data line 1
I2C bus serial data line 2
R signal output
G signal output
B signal output
Sub-microprocessor data output
Sub-microprocessor data input
Sub-microprocessor clock input

I2C bus open/closed output
No-signal field ID signal output
Not used
Fluorescent lamp error detect input
Audio input/output select

“H” for N443, “L” for others
“H” for P AL, “L” for others
“H” for SECAM, “L” for others
“H” for P AL-M, “L” for others
“H” for N358, “L” for others

Card (Card mode at “L” level)
Panel gate driver voltage control

No

51 REQ
52 AV/SY/DY2
53 FSMUTE
54 RSMUTE
55 HPDET
56 SSTBY
57 VSH IN
58 LMUTE
59 V IN/OUT
60 SRESET
61 DENKA
62 VCC
63 CARDPOW
64 VSS
65 TV/AV1
66 AV/AV2
67 VIS/3DS
68 AV1/VISY
69 AV/SY/DY1
70 STD
71 PMUTE
72 POWOUT
73 AD POW
74 IREM 2
75 MPRCS
76 MPRDA
77 MPCS
78 MPDA
79 MPCLK
80 DDCRESET
81 KEY4
82 KEY5
83 CARDRESET
84 SAW SW
85 MODE1
86 MODE2
87 SSYSTEM
88 SSW
89 AFT
90 AGC
91 KEY1
92 KEY2
93 KEY3
94 POWIN
95 VSYNC
96 AVSS
97 HSYNC
98 TVSETB
99 AVCC

100

. Pin name Function

Adjustment process
US CCD input select
Front mute
Rear mute
Headphone detect at “L” level
Speaker standby (at “H” level)
Panel gate driver voltage check
Line out audio mute
Video input/output select
Multiplex reset at “L” level
Electric charge prevention
Power
Card (ON/OFF)
Grounding
Analog switch 1
Analog switch 2
Analog switch 3
Analog switch 4
US CCD input select 2
Microprocessor power off output
P mute
DC/DC control output
Adaptor ON/OFF input
Reception at slave
G/A read enable
G/A data input
G/A chip select
G/A data output
G/A clock
Digital decoder reset
Key input 4
Key input 5
Card reset (at “H” level)
Tuner select (at “H” level)
Tuner select (at “H” level)
Tuner select (at “H” level)
S system switching detect
S terminal connect input at “L” level
AFT voltage input
AGC voltage input
Key input 1
Key input 2
Key input 3
DC/DC start-up detect
OSD vertical sync signal
Analog power input (GND)
OSD horizontal sync signal
Closed caption (GND)
OSD power input

CVIN

Closed caption signal input

18

Adjustment process mode menus at a glance

Page Item

Initial setting

Function Adjust/modify

Basic settings

1 MODEL E1U Model number

INCH SIZE 20 Inch unit select Adjustment
SYSTEM N358 Color system select
NTSC PWN FREQ OCO Dimmer frequency setting
PAL PWM FREQ OBD Dimmer frequency setting
NTSC PWM DUTY 0 Dimmer duty setting
PAL PWM DUTY 0 Dimmer duty setting
TV GAIN OFF Auto gain setting in TV mode
ERROR NO RESET 0 Lamp error count & reset No. of lamp error detections
PUBLIC MODE OFF HOTEL MODE
V-CHIP (US) 1 VCHIP line mute setting
CANADIAN VCHIP OFF Canadian VCHIP setting
E1UVER Microprocessor Ver. No. display

Video adjustments

2 COM BIAS 90 Counter bias adjustment Adjustment

NTSC TAMP 20 TAMP adjustment Adjustment
PAL-M TAMP 20 TAMP adjustment
PAL-N TAMP 20 TAMP adjustment
RCUTOFF -1 White balance adjustment (Red) Adjustment
GCUTOFF 0 Green cutoff adjustment
BCUTOFF -1 White balance adjustment (Blue) Adjustment
G3 00 Data read value
B3 00 Data read value
R3 00 Data read value
G1 00 Data read value
B4 00 Data read value
Y 00 Data read value at TAMP adjustment
TAMP H CA Y upper limit setting at TAMP adjustment
TAMP L BB Y lower limit setting at TAMP adjustment
GAIBU VER External version display

3 TV NTSC CONT 51 Video contrast setting (TV NTSC)

TV PAL-M CONT 51 Video contrast setting (TV PAL-M)
TV PAL-N CONT 51 Video contrast setting (TV PAL-N)
AV N358 CONTRAST 49 Video contrast setting (Composite, S Video)
AV PAL CONTRAST 49 Video contrast setting (Composite, S Video)
AV SECAM CONTRAST 49 Video contrast setting (Composite, S Video)
AV PAL-M CONTRAST 49 Video contrast setting (Composite, S Video)
AV PAL-N CONTRAST 49 Video contrast setting (Composite, S Video)
AV PAL60 CONTRAST 49 Video contrast setting (Composite, S Video)
G3 00 Data read value
B3 00 Data read value
R3 00 Data read value
G1 00 Data read value
B4 00 Data read value
Y 00 Data read value

Adjustment (Same setting as for NTSC TAMP)
Adjustment (Same setting as for NTSC TAMP)

LC-20E1U
LC-20E1UB/UW

Audio adjustments

4 VOLUME 20 Volume

AVC OFF AVC setting
CARRIER MUTE ON Audio output setting out of sync with TV
IGR THR 12D IGR THRESH LEVEL
MSP DATA 0 Audio IC MSP data write & read
MSP DATA WAIT Write & read execution
PRESCALE FM/AM-M 17 Pre-scale setting (TV)
PRESCALE SCART 15 Pre-scale setting (external input)
FSP TEST OFF Audio test (FS mute ON/OFF)

5 MDB ON MDB

LVL -10 WF level adjustment
FRQ 120 WF LPF cutoff frequency setting
STR 40 MDB amount of effects setting
LMC -27 MDB limit value setting
HMC 00 MDB harmonics effect setting

19

LC-20E1U
LC-20E1UB/UW

Page Item

5 HPF 100 MDB Zone restriction HPF cutoff frequency

LPF 110 MDB Zone restriction LPF cutoff frequency

6 EXT GEQ BAND1 +1.0 Equalizer setting 1 (external input)

EXT GEQ BAND2 –1.0 Equalizer setting 2 (external input)
EXT GEQ BAND3 0.0 Equalizer setting 3 (external input)
EXT GEQ BAND4 0.0 Equalizer setting 4 (external input)
EXT GEQ BAND5 –2.0 Equalizer setting 5 (external input)
TV GEQ BAND1 +1.0 Equalizer setting 1 (TV)
TV GEQ BAND2 –1.0 Equalizer setting 2 (TV)
TV GEQ BAND3 0.0 Equalizer setting 3 (TV)
TV GEQ BAND4 0.0 Equalizer setting 4 (TV)
TV GEQ BAND5 –2.0 Equalizer setting 5 (TV)

Initial setting

Function Adjust/modify

Video adjustments (VPC settings)

7 I2C DATA 0 I2C bus control IC data write & read

I2C DATA WAIT Write & read execution
CBW 1 Chroma band pass setting
NOSEL 3 Comb filter setting
DDR 1 Comb filter setting
HDG 3 Comb filter setting
VDG 0 Comb filter setting
VPK 0 Comb filter setting
KILVL 08 08 Color killer level setting
KILHY 05 05 Color killer hysteresis setting
VSYNC DELAY 29 V sync phase setting
DVCO -720 DVCO setting
AUTO LCK 1 Line lock mode setting

Video adjustments (component)

8 VPC DATA 0 Video IC VPC data write & read

VPC DATA WAIT Write & read execution
TEST PATTERN 0 VPC test pattern select Video IC test pattern
AUTO LDLY 0 Y/C phase setting
DVD NTSC CR 25 Color density setting (component)
DVD NTSC CB 25 Color density setting (component)
DVD NTSC TINT +7 Color tone setting (component)
DVD NTSC BRIGHTNESS +68 Brightness setting (component)
DVD NTSC CONTRAST 26 Video setting (component)
DVD NTSC P FILTER 1 Peaking filter setting (component)
DVD NTSC H-PEAKING 3 Picture quality setting (component)
DVD NTSC BRIGHT2 +8 Brightness setting 2 (component)
DVD NTSC CONTRAST2 48 Video setting 2 (component)

9 DVD PAL CR 24 Color density setting (component)

DVD PAL CB 24 Color density setting (component)
DVD PAL TINT + 9 Color tone setting (component)
DVD PAL BRIGHTNESS +68 Brightness setting (component)
DVD PAL CONTRAST 26 Video setting (component)
DVD PAL P FILTER 1 Peaking filter setting (component)
DVD PAL H-PEAKING 4 Picture quality setting (component)
DVD PAL BRIGHT2 +8 Brightness setting 2 (component)
DVD PAL CONTRAST2 48 Video setting 2 (component)

Video adjustments (TV, composite & S video)

10 N358 TV COLOR 2500 Color density setting (TV)

N358 AV COLOR 2500 Color density setting (composite, S video)
N358 TV TINT +40 Color tone setting (TV)
N358 AV TINT +56 Color tone setting (composite, S video)
N358 BRIGHTNESS +8 Brightness setting (TV, composite, S video)
N358 PEAKING FILTER 1 Peaking filter setting (TV, composite, S video)
N358 TV H-PEAKING 4 Picture quality setting (TV)
N358 AV H-PEAKING 4 Picture quality setting (composite, S video)
N358 AVO START 152 Horizontal position setting
N358 SFIF 0 Horizontal position setting
N358 SCINC1 1623 Roundness setting

20

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Page Item

10 N358 TV LDLY 0 Y/C phase setting (TV)

N358 AV LDLY 0 Y/C phase setting (composite, S video)

11 N443 AV COLOR 2500 Color density setting (composite, S video)

N443 AV TINT +56 Color tone setting (composite, S video)
N443 BRIGHTNESS +8 Brightness setting (TV, composite, S video)
N443 PEAKING FILTER 1 Peaking filter setting (TV, composite, S video)
N443 AV H-PEAKING 4 Picture quality setting (composite, S video)
N443 AVO START 152 Horizontal position setting
N443 SFIF 0 Horizontal position setting
N443 SCINC1 1623 Roundness setting
N443 AV LDLY 0 Y/C phase setting (composite, S video)

Initial setting

Function Adjust/modify

Video adjustments (TV, composite & S video)

12 PAL AV COLOR 2500 Color density setting (composite, S video)

PAL AV TINT +56 Color tone setting (composite, S video)
PAL BRIGHTNESS +8 Brightness setting (TV, composite, S video)
PAL PEAKING FILTER 1 Peaking filter setting (TV, composite, S video)
PAL AV H-PEAKING 4 Picture quality setting (composite, S video)
PAL AVO START 152 Horizontal position setting
PAL SFIF 0 Horizontal position setting
PAL SCINC1 1623 Roundness setting
PAL AV LDLY 0 Y/C phase setting (composite, S video)

13 SECAM AV COLOR 2500 Color density setting (composite, S video)

SECAM AV TINT +56 Color tone setting (composite, S video)
SECAM BRIGHTNESS +8 Brightness setting (TV, composite, S video)
SECAM
SECAM AV H-PEAKING 4 Picture quality setting (composite, S video)
SECAM AVO START 152 Horizontal position setting
SECAM SFIF 0 Horizontal position setting
SECAM SCINC1 1623 Roundness setting
SECAM AV LDLY 0 Y/C phase setting (composite, S video)

14 PAL-M TV COLOR 2500 Color density setting (TV)

PAL-M AV COLOR 2500 Color density setting (composite, S video)
PAL-M TV TINT +40 Color tone setting (TV)
PAL-M AV TINT +56 Color tone setting (composite, S video)
PAL-M BRIGHTNESS +8 Brightness setting (TV, composite, S video)
PAL-M PEAKING FILTER 1 Peaking filter setting (TV, composite, S video)
PAL-M TV H-PEAKING 4 Picture quality setting (TV)
PAL-M AV H-PEAKING 4 Picture quality setting (composite, S video)
PAL-M AVO START 152 Horizontal position setting
PAL-M SFIF 0 Horizontal position setting
PAL-M SCINC1 1623 Roundness setting
PAL-M TV LDLY 0 Y/C phase setting (TV)
PAL-M AV LDLY 0 Y/C phase setting (composite, S video)

15 PAL-N TV COLOR 2500 Color density setting (TV)

PAL-N AV COLOR 2500 Color density setting (composite, S video)
PAL-N TV TINT +40 Color tone setting (TV)
PAL-N AV TINT +56 Color tone setting (composite, S video)
PAL-N BRIGHTNESS +8 Brightness setting (TV, composite, S video)
PAL-N PEAKING FILTER 1 Peaking filter setting (TV, composite, S video)
PAL-N TV H-PEAKING 4 Picture quality setting (TV)
PAL-N AV H-PEAKING 4 Picture quality setting (composite, S video)
PAL-N AVO START 152 Horizontal position setting
PAL-N SFIF 0 Horizontal position setting
PAL-N SCINC1 1623 Roundness setting
PAL-N TV LDLY 0 Y/C phase setting (TV)
PAL-N AV LDLY 0 Y/C phase setting (composite, S video)

16 PAL60 AV COLOR 2500 Color density setting (composite, S video)

PAL60 AV TINT +56 Color tone setting (composite, S video)
PAL60 BRIGHTNESS +8 Brightness setting (TV, composite, S video)
PAL60 PEAKING FILTER 1 Peaking filter setting (TV, composite, S video)
PAL60 AV H-PEAKING 4 Picture quality setting (composite, S video)
PAL60 AVO START 152 Horizontal position setting
PAL60 SFIF 0 Horizontal position setting
PAL60 SCINC1 1623 Roundness setting
PAL60 AV LDLY 0 Y/C phase setting (composite, S video)

PEAKING FILTER

1 Peaking filter setting (TV, composite, S video)

21