SHARP LC-20B1U Service Manual

LC-20B1U

SERVICE MANUAL

S52i8LC-20B1U

LCD COLOR TELEVISION

P

O

W

E

R

S

L

E

E

P

MODEL

LC-20B1U

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.

CONTENTS

Page Page

» IMPORTANT SERVICE SAFETY

PRECAUTION.................................................... 2

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

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

» DIMENSIONS .................................................... 8

» REMOVING OF MAJOR PARTS ....................... 9

» ADJUSTING PROCEDURE OF

EACH SECTION.............................................. 13

» TROUBLE SHOOTING TABLE ....................... 24

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

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

» DESCRIPTION OF SCHEMATIC DIAGRAM .. 34
» SCHEMATIC DIAGRAM

Ë

CONTROL and RC/LED UNIT .................. 35

Ë

DIGITAL UNIT............................................ 36

Ë

ANALOG UNIT .......................................... 46

Ë

INVERTER-A UNIT.................................... 50

Ë

INVERTER-B UNIT.................................... 51

» PRINTED WIRING BOARD ASSEMBLIES..... 52

» PARTS LIST

Ë

ELECTRICAL PARTS ................................ 56

Ë

DIGITAL UNIT............................................ 56

Ë

ANALOG UNIT .......................................... 61

Ë

CONTROL UNIT........................................ 64

Ë

RC/LED UNIT ............................................ 64

Ë

INVERTER-A UNIT.................................... 65

Ë

INVERTER-B UNIT.................................... 65

Ë

CABINET AND MECHANICAL PARTS ..... 66

Ë

ACCESSORIES PARTS ............................ 68

Ë

PACKING PARTS ...................................... 68

» PACKING OF THE SET................................... 69

SHARP CORPORATION

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

LC-20B1U

2

2

IMPORTANT SERVICE SAFETY PRECAUTION

Ë

Service work should be perfomed only by qualified ser vice 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 A GAINST A RISK OF
FIRE REPLACE ONLY WITH SAME
TYPE F3701 (2A, 125V), F3702
(1.6A, 125V), F6700 (1A, 125V),

A V

F6701 (1A, 125V), F6702 (1A,
125V), F6703 (1A, 125V) , F6704
(1A, 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 A C 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 ha ving 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 A C .) or more is e xcessive 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 F

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 , w attage , 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-20B1U

2

2

2

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
5000ohm/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

PRO TECTION CONTINUE CONTRE
LES RISQUES D'INCENDIE,
REMPLACER LE FUSIBLE PAR UN
FUSIBLE DE MEME TYPE F3701 (2A,
125V), F3702 (1.6A, 125V), F6700(1A,
125V), F6701(1A, 125V), F6702(1A,
125V), F6703(1A, 125V), F6704(1A,
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.
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.)
Tous les courants mesurés ne doivent pas dépasser
0,5 mA.

VERIFICATIONS 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 suiv ante:

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

0.15 F

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 kohm 10 watts en parallèle a vec 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

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121

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-20B1U

Precautions for using lead-free solder

1 Employing lead-free solder

"Digital PWB" 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 40°C, 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 y ou 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.

Be careful 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-20B1U

Items

LCD panel 19.7" Advanced Super View & 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 ø 2 in. (5 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 (3.5 ø)

PC Card slot PC Card Type II (PC card adapter)
Image File Format JPEG files complying with DCF format
OSD language English/French/Spanish
Power consumption AC 67 W (with AC adapter), DC 58 W (DC 13 V)
Power supply DC 13 V, AC 110
Weight 19 lbs (8.6 kg), w/o accessories
Accessories

Enviromental conditions

Model

2

Remote control, Batteries, Antenna cable, AC adapter,
AC cord, Cable clamps

0-40°C

LC-20B1U

- 240 V, 50/60 Hz

As a part of policy of continuous improvement, SHARP reserves the right to make design and specification changes for
product improvement without prior notice. The performance specification figures indicated are nominal values of
production units. There may be some deviations from these values in individual units.

Specifications are subject to change without notice.

5

LC-20B1U

Operation Manual

AV-IN2/OUT

AUDIO (L)

AUDIO (R)

VIDEO

T

O

IO

U

L

R

E

D

/O

ID

U

2

V

A

-IN
V
A

Main unit (rear view)

Y

T

N

B

E

Y

P

N
O

P
M

O
C

COMPONENT

RPB

AUDIO (L)

AUDIO (R)

P

R

IO

L

R

P

D

U
A

AV-IN1

VIDEO

L

VIDEO

AUDIO (L)

R

AUDIO

AUDIO (R)

S-VIDEO

S-VIDEO

HEAD

PHONE

ANT.

HEADPHONE

INPUT

DC13V

POWER

POWER INPUT

(DC 13V)

Antenna terminal

AV-IN1

V
O
L

C
H

M
E
N
U
T
V
/
V
I
D
E
O
M

A
I
N
P
O
W
E
R

PC Card slot

PC CardPC Card

Main unit (front view)

MENU

TV/VIDEO

MAIN POWER

MENU TV/VIDEO MAIN POWER

CH

VOL

Upper control panel

)/( )

CH (

-

VOL ( )/(+)

Speaker

Speaker

PC Card slot

To change the vertical angle of the LCD

TV set, tilt the screen up to 5 degrees

forward or 10 degrees backward. The

TV set can also be rotated 50 degrees

horizontally. Please adjust the angle so

that the TV set can be watched most

comfortably.

P
E
E
L
S

R
E
W
O
P

The SLEEP indicator lights up red when

the SLEEP TIMER is set to on.

SLEEP indicator

POWER indicator

Remote sensor window

(The actual location is not visible.)

6

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).

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

remote control.

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

Note

C
H

| \

|

/ / / (Cursor control)

|

ENTER/

DISPLAY

POWER

SLEEP CARD

2

CARD*

ENTER

3

MENU

FLASHBACK*

TV/VIDEO

FLASHBACK

CHVOL

MUTE BRIGHT MENU TV/VIDEO

LC-20B1U

CH ( )/( )

Channel Select

3

6

9

2

5

8

1

4

7

Displays the receiving

channel for 10 seconds.

Turns on CARD mode to play

back a memory card.

1

*

Returns to the previous

2

3

*

*

100

0

MTS

channel.

Selects audio settings.

4

*

1

POWER

DISPLAY*

VO
L

C
H

M
ENU

T
V
/
V
ID
EOM

A
IN
P
O
WE
R

SLEEP

MUTE

BRIGHT

)

-

VOL(+)/(

4

MTS*

On-screen display

60

VOLUME

Headphones

Rear terminal

V
O
L

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

Before connecting a connection cord into the rear

terminal, remove the back cover. Push in the tab and

Removing the Back Cover

pull out the back cover carefully.

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.

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

Listening with Headphones

HEADPHONE jack.

Note

7

LC-20B1U

Dimensions

/ 473.5

64

/

41

18-

/ 381.5

64

/

1

15-

/ 1887-

32

/

13

7-

/ 193.5

8

/

5

CHVOL TV/VIDEOMENU MAIN POWER

9

/

16

12-

24-51/

51

/

64

15-

/ 319

64

/ 630

/ 401.3

/ 40

64

/

37

1-

/ 298.8

64

/

49

11-

/ 66.6

8

/

5

2-

/ 72.6

64

/

55

2-

1-37/

14-59/

64

/ 379

4-7/

32

/ 107.3

2-55/

64

/ 72.6

64

/ 40

VIDEO

AV-IN1
L

AUDIO

R

S-VIDEO

HEAD

PHONE

ANT.

POWER

INPUT

DC12V

Unit: inch/mm

1-13/

6-

/ 87.5

16

/

7

3-

/ 468.8

64

/

29

18-

64

/ 30.5

29

/

64

/ 163.9

1

9-

/

32

/ 229.4

37

/

64

/ 65.5

2-

VIDEO

AV-IN 2/OUT

AUDIO

COMPONENT

AUDIO

L

R

Y

P

B

R

P

L

R

/ 100

16

/

15

3-

3-15/

/ 1.5

16

/

1

16

/ 100

8

REMOVING OF MAJOR PARTS

V

O

LC

H

M

E

N

U

T

V

/

V

I

D

E

O

M

A

I

N

P

O

W

E

R

Front Cabinet

Rear Cabinet

Table Stand

Back Cover

Back Cover

1

1

2

3

3

3

3

3

3

1. Remove the two back covers.

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

3. Rear cabinet is detached opening some rear cabinet and shifting to a PC card slot side,
where a card release button is pushed in.

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

5. Remove the PC card unit.
5-1. Detach the connector.
5-2. Remove the PC card frame angle

fixing screws (2 pcs.).

5-3. Remove the ground cable

fixing screws (3 pcs.).

6. Detach the connector from each PWB.

LC-20B1U

5-3

5-2

5-2

PC CARD Unit

PC Card Frame Angle

5-3

5-1

5-3

66

6

6

[CAUTION]

When you attach FFC, a
black dot mark should be
on a card unit side.

6

6

DIGITAL PWB

6

6

6

CONTROL PWB

6

6

INVERTER-A
PWB

Reinforcement Angle

6

6

6

4

ANALOG PWB

6

6

6

6

6

6

6

RC/LED PWB

6

INVERTER-B PWB

9

LC-20B1U

7. Remove the digital PWB fixing screws (1 pcs.).

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

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

10. Undo the hooks and slide the chassis frame cover out of position.

11. Remove the analog PWB fixing screws (3 pcs.).

12. Remove the RC/LED PWB fixing screws (2 pcs.).

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

8

Chassis Frame

DIGITAL PWB

7

11

INVERTER-A
PWB

ANALOG
PWB

10

9

INVERTER-B
PWB

CONTROL PWB

RC/LED PWB

12

Chassis Frame Cover

13

10

» 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.

14.Remove the four screws and open the LCD display unit.

15.Remove the ITO earth angle fixing screw (1 pcs.).

16.Detach the reflection/deflection, prism, diffusion, ITO sheets and diffusion plate.

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

18.Detach the lamp set A/B.

19.Remove the reflection plate fixing screws (6 pcs.).

Shielding plate
(CSLDM4685CE02)

Lamp holder
(LHLDZ2176CEZZ)

Diffusion plate
(PCOVU0107CEZZ)

ITO sheet
(PSHEP0289CEZZ)

LC-20B1U

o

Prism sheet
(PSHEP0287CEZZ)

20" LCD panel unit

r

Reflection/deflection sheet

Ground cable
(QCNW-A548WJZZ)

(PSHEP0286CEZZ)

u

y

ITO earth angle

t

Diffusion sheet
(PSHEP0288CEZZ)

(MSPRP1220CEFW)

u

i

Lamp holder
(LHLDZ2176CEZZ)

Lamp set-A
(KLMP-0124CEZZ)

Lamp set-B
(KLMP-0125CEZZ)

Reflection plate
(PMiR-0296CEZZ)

11

LC-20B1U



Notes at the time of the side B(back) service of a digital unit

1. Remove PC card slot attachment angle fixed screws(2 pcs.).

2. Remove the FFC from a PC card unit.

3. Remove the grounding cable fixed screws(2 pcs.).

4. Remove the FFC for connection between digital unit (SC2001) and analog unit (SC3403), and connect the exten­sion FFC for service(QCNW-A324WJZZ).

5. Remove the cable for connection between digital unit (P2004) and analog unit (P3702), and connect the extended
cable for service(QCNW-A323WJZZ).

6. Remove the chassis frame fixed screws(4 pcs.), it shifts to right-hand side, and remove the double-sided tape (for
digital unit (SC1203) - LCD panel connection FFC fixation) under a chassis frame.

7. Remove the RC/LED unit.
7-1. Open a wire holder.
7-2. Remove the RC/LED unit fixed screws(2 pcs.).

8. Remove the digital unit fixed screw(1 pc.), a substrate is reversed.

1

1

3

3

PCcard
slot

DIGITALUnit

(sideB)

8

2

SC901

DIGITAL
Unit

SC1203

P2003

P2004

6



4



SC2001

5

ANALOGUnit

SC3403

P3702

8



RC/LEDUnit

7-2

7-1

WireHolder

12

LC-20B1U

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.

13

LC-20B1U

4.Adjustments

Adjustment Adjusting conditions Adjusting method

1 B+ Adjustment

(R3760)

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

1. Adjust the "B+ Adj" value to

5.0 ±0.02V with R3760. Make exact
adjustment of the 5.00 V 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.

2 Inch Size setup

(If E2PROM is replaced)
(IC2004)

3 Common-bias adjustment

4 TAMP adjustment

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, howev er,
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.)

2. Adjust the “NTSC TAMP” 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. 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

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

Vertical 180th line and
horizontal 46th pixel

640 pixels

GAIBU VER0.000

480 lines

“Y” data
(white 75%)

5 White balance adjustment

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.

14

1. Do not change the “GCUTOFF” setting
because otherwise the black le v el ma y
fluctuate.

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

Upside................................................................................................................................................. Normal

Right/Left ............................................................................................................................................ Normal

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

Closed Caption (Mode) ...................................................................................................................... OFF

(Data) ....................................................................................................................... CH1

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

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

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

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

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

CARD Last Card Mode ................................................................................................................... CARD

SLIDE SHOW SETTING INTERVAL .................................................................................. 5SEC

ORDER TO SHOW..................................................................... NORMAL

REPEAT ..................................................................................... OFF

MY PROGRAM SET PROGRAM ......................................................................... NONE

SOUND SETTING TV ............................................................................................... —(OFF)

AV1 ............................................................................................. —(OFF)

AV2 ............................................................................................. —(OFF)

COMPONENT ............................................................................ —(OFF)

LC-20B1U

15

LC-20B1U

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 7, 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.

Yellow

Green

Cyan

Magenta

Green

Red

Blue

greengreen

» 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 16, turn on the setting, and the following test pattern
shows up.

2-2. Test pattern

The following test pattern appears.

Yellow

Cyan

Magenta

The green pattern is displayed as shown at left.

W

h

i

t

gradation

e

Dark
Dark
Dark

Black

0-level

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.

16

Pin functions of microprocessor IC (IC2001) RH-iXA276WJZZQ

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 PAL, “L” for others
“H” for SECAM, “L” for others
“H” for PAL-M, “L” for others
“H” for N358, “L” for others

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

No

. Pin name Function
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

CVIN

LC-20B1U

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 vertical sync signal
Closed caption (GND)
OSD power input
Closed caption signal input

17

LC-20B1U

Adjustment process mode menus at a glance

Page Item

Initial setting

Function Adjust/modify

Basic settings

1 INCH SIZE 20 Inch size select Adjustment

MODEL B1U Model number
CARD ON
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
V-CHIP 1 VCHIP line mute setting
CANADIAN VCHIP OFF Canadian VCHIP setting

Note: Microprocessor’s Version is displayed on the bottom of a screen.

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 Red cutoff adjustment Adjustment
GCUTOFF 0 Green cutoff adjustment
BCUTOFF -1 Blue cutoff adjustment 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

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)

Audio adjustments (MSP settings)

4 TV GEQ BAND1 +0.5 Equalizer setting 1 (TV)

TV GEQ BAND2 +0.5 Equalizer setting 2 (TV)
TV GEQ BAND3 +1.0 Equalizer setting 3 (TV)
TV GEQ BAND4 +0.5 Equalizer setting 4 (TV)
TV GEQ BAND5 –1.0 Equalizer setting 5 (TV)
EXT GEQ BAND1 +0.5 Equalizer setting 1 (external input)
EXT GEQ BAND2 +0.5 Equalizer setting 2 (external input)
EXT GEQ BAND3 +1.0 Equalizer setting 3 (external input)
EXT GEQ BAND4 +0.5 Equalizer setting 4 (external input)
EXT GEQ BAND5 –1.0 Equalizer setting 5 (external input)
AVC OFF AVC setting
CARRIER MUTE ON Audio output setting out of sync with TV
IGR THR 12D IGR THRESH LEVEL

5 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)

18

LC-20B1U

Page Item

Initial setting

Function Adjust/modify

Video adjustments (VPC settings)

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

IC2 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)

7 VPC DATA 0 Video IC VPC data write & read

VPC DATA WAIT Write & read execution
TEST PATTERN 0 PVC 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)

8 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)

9 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
N358 TV LDLY 0 Y/C phase setting (TV)
N358 AV LDLY 0 Y/C phase setting (composite, S video)

10 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)

19

LC-20B1U

Page Item

Initial setting

Function Adjust/modify

Video adjustments (TV, composite & S video)

11 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)

12 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)

13 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)

14 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)

15 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)

20

LC-20B1U

Page Item

Initial setting

Function Adjust/modify

Search AFT reference & LCD controller settings

16 AFT UP 2.7 AFT reference voltage

AFT DOWN 1.8 AFT reference voltage
NTSC 01 8C Initial settings
NTSC 02 C0 Various settings
NTSC 03 81 RCUTOFF
NTSC 04 00 GCUTOFF
NTSC 05 81 BCUTOFF
NTSC 06 0C Horizontal display position
NTSC 07 10 Vertical display position
NTSC 08 00 UV data phase delay
NTSC 09 4C Panel clock adjustment
NTSC 0A 4B Display screen top/bottom mask position
NTSC 10 80 Test pattern display
NTSC 11 00 Test pattern data
NTSC 12 00 Horizontal display mask (left) position
NTSC 13 00 Horizontal display mask (right) position
NTSC E0 00 FIFO TEST
NTSC E1 03 Sync polarity reversal
NTSC F0 07 OFL terminal operation setting
NTSC F1 00 Inverter frequency setting
NTSC F2 00 Inverter duty setting
NTSC F3 C0 Dimmer frequency setting, lower level
NTSC F4 00 Dimmer frequency setting, upper level
NTSC F5 00 Dimmer PWM setting, lower level
NTSC F6 00 Dimmer PWM setting, upper level
NTSC F7 00 OFL 1/2 phase
NTSC 14 02 System clock setting
G/A TEST PATERN OFF Gradation test pattern display LCD controller IC test pattern

17 PAL 01 8E Initial settings

PAL 02 C8 Various settings
PAL 03 81 RCUTOFF
PAL 04 00 GCUTOFF
PAL 05 81 BCUTOFF
PAL 06 14 Horizontal display position
PAL 07 18 Vertical display position
PAL 08 O2 UV data phase delay
PAL 09 4C Panel clock adjustment
PAL 0A 4A Display screen top/bottom mask position
PAL 10 80 Test pattern display
PAL 11 00 Test pattern data
PAL 12 00 Horizontal display mask (left) position
PAL 13 00 Horizontal display mask (right) position
PAL E0 00 FIFO TEST
PAL E1 03 Sync polarity reversal
PAL F0 07 OFL terminal operation setting
PAL F1 00 Inverter frequency setting
PAL F2 00 Inverter duty setting
PAL F3 BD Dimmer frequency setting, lower level
PAL F4 00 Dimmer frequency setting, upper level
PAL F5 00 Dimmer PWM setting, lower level
PAL F6 00 Dimmer PWM setting, upper level
PAL F7 00 OFL 1/2 phase
PAL 14 02 System clock setting
CLOSED CAPTION 15 Closed caption threshold level
CCD ISO 16 Closed caption phase setting
AIR SEARCH 1.6 Last sync ID frequency at air ON search

21