SHARP LC20B6US Service Manual

LC-20B6U-S

SERVICE MANUAL

S64T8LC20B6US

LCD COLOR TELEVISION

MODEL

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

CONTENTS

» IMPORT ANT SER VICE SAFETY PRECAUTION.........................................................................................2

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

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

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

» REMOVING OF MAJOR P ARTS ..................................................................................................................9

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

» TROUBLE SHOOTING TABLE ..................................................................................................................28

» MAJOR IC INFORMATIONS ......................................................................................................................33

» CHASSIS LAYOUT .....................................................................................................................................48

» BLOCK DIAGRAM......................................................................................................................................50

» OVERALL WIRING DIAGRAM ...................................................................................................................52

» DESCRIPTION OF SCHEMATIC DIAGRAM .............................................................................................54

» SCHEMATIC DIAGRAM .............................................................................................................................55

» PRINTED WIRING BOARD ASSEMBLIES................................................................................................81

» REPLACEMENT PARTS LIST.................................................................................................................... 90

» PACKING OF THE SET............................................................................................................................103

LC-20B6U-S

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-20B6U-S

IMPORTANT SERVICE SAFETY PRECAUTION

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

WARNING

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

2. Disconnect AC power before servicing.

CAUTION: FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE REPLACE ONL Y WITH SAME TYPE F3701 (2.0A, 250V), F3702

A V

(1.25A, 250V), AND F6701 (6.3A, 250V) 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 1.5k 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 resistor.

• Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor. All checks must be repeated with the AC cord plug connection reversed. (If necessary, a nonpolarized adaptor plug must be used only for the purpose of completing these checks.) Any reading of 0.75V peak (this corresponds to 0.5 mA. 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

1.5k 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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Replacement Parts Lists

and

LC-20B6U-S

DVM

ECHELLE CA

1.5k ohm 10W

0.15 µF

SONDE D'ESSAI

AUX PIECES METALLIQUES EXPOSEES

BRANCHER A UNE TERRE CONNUE

PRECAUTIONS A PRENDRE LORS DE LA REPARATION

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.

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

A V

FUSIBLE P AR UN FUSIBLE DE MEME TYPE F3701 (2.0A, 250V), F3702 (1.25A, 250V) F6701 (6.3A, 250V).

• 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 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

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

Avant de rendre le récepteur à l'utilisateur, effectuer

0,5 mA. Dans le cas contraire, il y a une possibilité de choc électrique qui doit être supprimée avant de rendre le récepteur au client.

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 et de compartiment, les réseaux de résistance-capacité, 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 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 1.5kΩ 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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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.

LC-20B6U-S

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 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 soldering bit, contact our service station or service branch 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 wettability, you may be apt to keep the soldering bit in contact with the PWB for extended period of time. However, Since the land may be peeled off or the maximum heat-resistance temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady soldering condition. Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn on and off the power of the bit as required. If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder . Clean the bit after every use of it. When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.

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

SPECIFICATIONS

Items

LCD panel 20.1'' Advanced Super View & BLACK TFT LCD Number of dots 2,359,296 dots XGA Video color systems N358, N443, PAL, PAL-M, PAL-N, SECAM, PAL-60

TV Standard (CCIR) NTSC/PAL-M/PAL-N

TV function

TV T uning System

PLL 181 ch. STEREO MTS+SAP CATV 125 ch.

Y/C FILTER 3D Y/C FILTER Brightness 430 cd/m

Viewing angles H: 170° V: 170° Audio amplifier 2.1 W × 2 Speakers ø2.1 in. (ø5.7 cm), 2 pcs.

COMPONENT1

COMPONENT1-IN, AUDIO-IN COMPONENT2/AV1 COMPONENT2/AV1-IN, AUDIO-IN, S-VIDEO-IN

Terminals AV-IN2 AV-IN2/AV-OUT

PC-IN PC Connector: 15-pin mini D-sub PC AUDIO: Mini-jack for stereo (ø3.5 mm) Antenna F-Type Headphone Mini-jack for stereo (ø3.5 mm)

OSD language English/Spanish/French Power supply DC 12V, AC 110-240V, 50/60Hz (AC adapter), AC 110-125V (AC cord) Power consumption 81 W (0.5 W standby) :AC 120V

71 W: DC 12V

Weight 19.0 lbs. (8.6 kg), w/o accessories Accessories Remote control, Battery (× 2), Antenna cable, AC adapter, RGB cable, AC cord,

Cable holder, Cable clamp, Operation manual, Registration card

Model

LC-20B6U

Ë As a part of policy of continuous improvement, SHARP reserves the right to make design and specification changes for product improve-

ment 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.

LC-20B6U-S

Part Names of Main Unit

Controls

• INPUT, CH (

)/(

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

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

HEADPHONE jack

Plug the headphone mini-plug into the Headphone

jack located on the front of the main unit.

OPC (Optical Picture Control) sensor

Remote sensor

OPC indicator (Optical Picture Control)

The OPC indicator lights up green when the “OPC” is set to “ON”.

POWER/WAKE UP TIMER indicator

POWER indicator lights up green when the power is on, and red

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

main power is off), and orange when the wake-up timer is set (the

indicator will light when in the standby mode).

To change the vertical angle of the LCD TV

set, tilt the screen up to 5 degrees forward or

10 degrees backward. The LCD TV set can

also be rotated up to 25 degrees to right and

left. Please adjust the angle so that the LCD

TV set can be watched most comfortably.

MAIN POWER

Upper control panel

INPUT

CH (Channel)

(

)/( )

VOL (Volume)

(–)/(+)

Speaker

Listening with Headphones

• Pl ug the he adphon e mini-p lug in to the HEAD PHON E jack lo cated on the rear of the main unit.

• Headphones are not included in the supplied accessories.

• No sound is heard from the main unit speakers when a headphone mini-plug is connected into the HEADPHONE jack.

On-scree

n display

VOLUME

just the sound volume

using VO L (

)/(

–

) on the

remote control.

Headphones

Terminals

Carrying handle

Rear View

AUDIO (L)

AUDIO (R)

VIDEO

AUDIO (R)

AUDIO (L)

AV-IN2/OUT

ANT. (Antenna terminal)

POWER INPUT

(DC 12V)

Y/VIDEO

AUDIO (L)

AUDIO (R)

S-VIDEO

COMPONENT2/AV1

COMPONENT1

ANALOG RGB

AUDIO

PC-IN

How to Fix the Cables

• Pull th e cables connec ted to ea ch ter minal th rough th e holes an d close th e left and righ t termin al cove rs.

Push the cables into the groo ves of the su ppor t cove r. In ser t the ca ble holder (sup plie d) fr om ab ove th e

support cove

r and fix the cables.

Terminal cover

Cable holder

Terminal cover

Support cover

Cable clamp

Whä÷ the cables cann ot be

pushed into the groo ves of

the support cover, use th e

cable clamp (supplie d) to fix

them. The cable clamp ca n

be attached by push ing it

into the hole on the stand.

OPERATION MANUAL

LC-20B6U-S

Part Names of Remote Control

DISPLAY

Displays the receiving channel and

the current time for 10 seconds.

AV MODE

Selects preferred AV MODE.

BACKLIGHT

Adjusts the brightness of the screen.

' /" / \ /| (Cursor control)

Selects a desired item on the screen.

Displays the menu screen.

INPUT

Switches the input source

between COMPONENT1,

COMPONENT2 (or A V1), A V2,

PC and TV mode.

Displays Closed Caption subtitles.

FLASHBACK

Returns to the previous channel.

CH (

)/(

)

Selects channel.

Channel Select

Sets the channel.

POWER

Switches the Liquid Crystal Television power on or off.

TV Signals in Your Region

This product is factory set to comply with the TV broadcasting system in the United States. For Brazil, Argentina and Uruguay,

set the color system according to the country before using this product by following the table below.

U.S.A.

Color: NTSC NTSC (N358) NTSC (N358)

TV ch: US ch US ch US ch

Not required or N/A

Canada, Mexico, Color: NTSC NTSC (N358) NTSC (N358)

Latin America TV ch: US ch US ch US ch

Not required or N/A

Brazil

Color: PAL-M NTSC (N358) NTSC (N358) Set color system to

TV ch: US ch US ch US ch PAL-M

Argentina, Color: PAL-N NTSC (N358) NTSC (N358) Set color system to

Uruguay TV ch: US ch US ch US ch PAL-N

• The 3 Dimensional Y/C separation circuit* only works when the color system is set to N358 in TV mode and Video mode.

* The 3 Dimensional Y/C separation circuit is used to remove flickering and color bleeding.

* The 3 Dimensional Y/C separation circuit does not function when S-VIDEO or COMPONENT signals are played.

TV broadcasting

system

Factory setting of color system User setting

TV Video TV/Video

Country

PIC. FLIP

Sets the orientation of the picture.

SLEEP

Sets the sleep timer.

ENTER

Executes a command.

MENU RETURN

Returns to the previous screen.

MUTE

Mutes the sound.

AUDIO ONLY

Outputs audio without screen image.

VOL (+)/(–)

Sets the volume.

MTS

Selects audio settings.

Installing Batteries in the Remote Control

Before using the LCD TV set for the first time, install the two

“AAA” size batteries supplied in the remote control. When the

batteries become depleted and the remote control fails to operate, replace the batteries with new

“AAA” size batteries.

Open the battery cover.

Insert two “AAA” size batteries.

Close the battery cover.

Ë Place batteries with their

terminals corresponding

to the (+) and (

–)

indications in the battery

compartment.

Caution!

Precautions regarding batteries

Ë Improper use of batteries can result in a leakage of chemicals and/or explosion. Be sure to follow the instructions below.

• Place batteries with their terminals corresponding to the (+) and (

–) indications.

• Different types of batteries have different characteristics. Do not mix batteries of different types.

• Do not mix old and new batteries. Mixing old and new batteries can shorten the life of new batteries and/or cause old

batteries to leak chemicals.

• Remove batteries as soon as they are depleted. Chemicals that leak from batteries can cause a rash. If chemical

leakage is found, wipe it off with a cloth.

• The batteries supplied with the LCD TV set may have a shorter operating time due to storage conditions.

• If the remote control is not to be used for an extended period of time, remove the batteries from the remote control.

Preparation

Ë Engaging the lower

claw with the remote

control, close the

cover.

Ë Slide the cover while

pressing the (

) part.

–

LC-20B6U-S

DIMENSIONS

(212)

(384)

Unit: inch (mm)

(including rubber foot)

(452)

(393)

(59)

(261)

(673)

(410.5)

(308.4)

(100)

(74)

(including rubber foot)

(450)

(178)

(244)

(100)

(47)

REMOVING OF MAJOR PARTS

1. Remove the four lock screws from the stand, and detach the stand.

2. Remove the terminal covers (left and right).

3. Remove the three terminal screws.

4. Remove the twelve lock screws from the cabinet B.

5. Cabinet A is order of

6. Remove the four lock screws from the stand angle, and detach the reinforcement angle.

7. Disconnect all the connectors from all the PWBs.

Terminal Cover (S)

5-1

thru

, and detach the cabinet B.

5-6

5-4

5-3

5-2

5-1

Cabinet A

LC-20B6U-S

Cabinet B

Reinforcement Angle

5-6

5-5

Stand

Terminal Cover (L)

Main PWB

CN1

SC1201

P4050

P2003

SC701

SC2001

Operation PWB

P6707

P6706

P6705

P3302

R/C, LED PWB

P3704

SC3403

7 7

P3404

P3303

P4001

P3703

Analog PWB

P6704

P6703

P6702

P6701

Inverter PWB

LC-20B6U-S

8. Remove the two lock screws from the operation panel (top cover), and detach the operation panel (top cover).

9. Remove the two lock screws from the operation PWB, and detach the operation PWB.

10. Remove the two lock screws from the R/C, LED PWB, and detach the R/C, LED PWB.

11. Remove the two lock screws each from the speaker boxes (left and right), and detach both the speaker boxes.

Operation panel (Top Cover)

Operation PWB

Speaker Box (R)

R/C, LED PWB

Main PWB

Analog PWB

Speaker Box (L)

Inverter PWB

LC-20B6U-S

Inverter PWB

Main PWB

Analog PWB

Chassis Frame (L)

Chassis Frame (R)

12. Remove the two lock screws from the inverter PWB, and detach the inverter PWB.

13. Remove the five lock screws from the main PWB, and undo the claws a and b. Detach the main PWB by lifting the area around the claws and pulling the PWB out.

14. Remove the four lock screws from the analog PWB, and undo the claws c and d. Detach the chassis frame (right) from the analog PWB by pulling out the terminals. In the same way, undo the claws e and f, and detach the chassis frame (left) from the analog PWB by pulling out the terminals.

Note: When detaching the main PWB and analog PWB, be careful not to break the PWB-fixing claws.

LC-20B6U-S

» Precautions in handling the liquid crystal panel

1. Handle it in a clean room. (above 50% humidity)

2. The worker must wear an earth band.

3. Be careful not to drop, vibrate and shock the panel.

4. Use an ionizer. (within 30 cm)

15. Remove the three lock screws from the liquid crystal panel, and detach the liquid crystal panel unit.

16. Remove the prism sheet (H), (V), diffusion sheet and diffusion plate.

17. Remove the lamp unit from the lamp holder (top). Then detach the (bottom)-left and (bottom)-right lamp holders.

18. Remove the upper and lower reflection sheets from the back shield.

Back Shield

Reflection Sheet (Top) (PSHEPA205WJZZ)

Lamp Holder (Bottom)-Left (LHLDZA368WJKZ)

Lamp Unit (KLMP-A034WJZZ)

Lamp Holder (Top) (LHLDZA365WJKZ)

(PSLDMA448WJFW)

Diffusion Sheet (PSHEPA204WJZZ)

Prism Sheet (H) (PSHEPA203WJZZ)

20" LCD Panel Unit

Lamp Holder (Top) (LHLDZA365WJKZ)

Diffusion Plate (PCOVUA035WJZZ)

Prism Sheet (V) (PSHEPA208WJZZ)

Reflection Sheet (Bottom) (PSHEPA206WJZZ)

Lamp Holder (Bottom)-Right (LHLDZA367WJKZ)

LC-20B6U-S

»Precautions in servicing the B side (backside) of the main PWB unit

1. Disconnect the FFC from between the main PWB (SC2001) and the analog PWB (SC3403), and then connect the service-specific extension FFC (flat cable) (QCNW-C459WJQZ).

2. Disconnect the SC701 side of the lead from between the main PWB (SC701) and the analog PWB (P3704), and then connect the service-specific extension cord (QCNW-B461WJQZ).

3. Disconnect the FFC for connection between the main PWB (SC1201) and LCD panel unit, and then connect the service-specific extension FFC (flat cable) (QCNW-C458WJQZ).

4. Remove the lock screws from the main PWB, detach the PWB from the chassis frame, and then turn it over to service.

Main PWB (Side-B)

CN1

SC1201

Analog PWB

1 2

SC2001

SC3403

SC701

P3704

Main PWB

Inverter PWB

Step Part No. Description

1 QCNW-C459WJQZ Extension Cable 60-pin Main (SC2001)-Analog (SC3403) 2 QCNW-C461WJQZ Extension Cable 15-pin Main (SC701)-Analog (P3704) 3 QCNW-C458WJQZ Extension Cable 80-pin Main (SC1201)-LCD Panel

LC-20B6U-S

ADJUSTING PROCEDURE OF EACH SECTION

1. Pre-adjustment preparations

Use the specific AC adaptor or a stable DC power supply as power source.

LC-20B6U AC adapter: UADP-A065WJPZ

DC power supply: 12 (V), 6.6 (A) or more

(1) How to enter the adjustment process mode

The following two methods are available.

» While holding down the "INPUT" and "VOLUME (–)" keys on the set, turn ON the power and press the "CH (Ù)"

and "VOLUME (–)" keys at once.

» Turn ON the power with either of KEY4 (pin (81) of microprocessor) and KEY5 (pin (82) of microprocessor)

staying at "L".

(2) Key operation in adjustment process

Ë Basic operation

» Select a station with the station-selection UP/DOWN key. » Switch the input with the input selector key. » Using the cursor UP/DOWN key, select an item to be adjusted. (When the cursor DOWN key is pressed with the

cursor placed on the bottom item, the cursor will move to the top item on the next page. When the cursor UP key is pressed with the cursor placed on the top item, the cursor will move to the bottom item on the previous page.)

» Adjust the selected item with the volume UP/DOWN key or the cursor RIGHT/LEFT key » Pressing the menu key will move the cursor to the next item. (When the menu key is pressed with the cursor

placed on the bottom item, the cursor will move to the top item on the next page.)

» Pressing the manual memory key will return the cursor to the top item. (When the manual memory key is pressed

with the cursor placed on the top item, the cursor will move to the top item on the previous page.)

» Pressing the auto preset key will move the cursor to the top item on the next page.

Ë Hierarchical structure

» When the ENTER key is pressed with the cursor placed on an item other than I

page corresponding to the selected item will appear.

» To exit each setting page, press the "Previous Screen" key.

Initialization

1. Set both pins (81) and (82) of IC2001 (microprocessor) to GND and turn ON the power

2. Check the model name (A625). *Note: MODEL cannot be changed.

3. Inch size selection Check INCH SIZE (20) * Note: INCH SIZE cannot be changed.

C DATA on page 9, the setting

2.Adjusting procedure

(1)AD converter level adjustment

1 D3 input

1) D3 75% color bar signal input Device name: LEADER LT446 Signal name: COLOR BAR 75% Setting: 01: 1920 x 1080 / 60i H: 33.72kHz, V: 29.97Hz

2) Set AUTO GAIN-OFFSET1 on page 7 of the adjustment process menu to ON.

2 PC input

1) VGA 75% color bar signal input Device name: LEADER LT446 Signal name: COLOR BAR 75% Setting: 07: 640 x 480 / 60P H: 31.47kHz, V: 59.94Hz

2) Set AUTO GAIN-OFFSET2 on page 8 of the adjustment process menu to ON.

LC-20B6U-S

021|2

T Y T

P P

O A D A T A A

M M

S L L

T P C

H T

A T T

M A A

P P

11 12 13 14 15 16 17 18 19 20 21

4 1 1 1

2 5 5 6 9 9 9

7 7 9 0 5 5 5

24 25 26 0 1 2 3 4 5 6 7 8

Y Data

(White 75%)

(2)Adjustment of TAMP

1) 75% standard color bar signal reception

2) If the reading of "YDATA" on page 2 of the adjustment process menu falls outside the range shown in the table below, adjust "NTSC TAMP" on this page so that the reading of "YDATA" falls within this range. * Note that settings may vary with models.

3) Set "PAL-M TAMP" and "PAL-N TAMP" to the same value to which "NTSC TAMP" is set.

Model LC-20B6U-S

Setting 157-160

Reference (Page 2 of adjustment process menu)

LC-20B6U-S

(3)Adjustment of white balance

1) How to adjust the white balance

1 Select the component -480i input. 2 Adjust "R CUTOFF2" and "B CUTOFF2" so that "White 20%" takes on the following WB target values.

Caution: "G CUTOFF2" should be fixed.

3 Adjust two strong colors of "R/G/B-GAIN" downward so that "White 80%" takes on the WB target values.

Caution: Any one of "R/G/B-GAIN" should be fixed at 64.

4 Repeat steps 2 and 3 so that "White 20%" and "White 80%" takes on the target values. 5 Enter the values of "R/B_CUTOFF2" and "R/G/B-GAIN" set in steps 2 to 4 in the corresponding items of

"Composite adjustment", "Component -1080i adjustment" and "PC-VGA adjustment" shown below.

6 Select the composite input and check that "White 20%" and "White 80%" are within the inspection specifications

on the next page. Caution: The component Ys output signal of the automatic regulator should be used also when the composite input is selected. In the case of the CVBS output, the signal level is different.

7 If "White 20%" and "White 80%" are not within the inspection specifications, make the adjustment described

in steps 2 to 4.

8 Select the component -1080i input and check that "White 20%" and "White 80%" are within the inspection

specifications on the next page.

9 If "White 20%" and "White 80%" are not within the inspection specifications, make the adjustment described

in steps 2 to 4.

0 Select the PC-VGA input and check that "White 20%" and "White 80%" are within the inspection specifications

on the next page.

q If "White 20%" and "White 80%" are not within the inspection specifications, make the adjustment described

in steps 2 to 4.

2) Adjustment value

• Composite adjustment...RGB CUTOFF2 and RGB-GAIN on page 3 of adjustment process menu

• Component -480i adjustment...A RGB CUTOFF2 and A RGB-GAIN on page 4 of adjustment process menu

• Component -1081i adjustment...D RGB CUTOFF2 and D RGB-GAIN on page 5 of adjustment process menu

• PC-VGA adjustment...PC RGB CUTOFF2 and PC RGB-GAIN on page 5 of adjustment process menu

3) WB target value (numeric values for MINOLTA CA-210)

Adjustment value Adjustment specifications

White 80% x=0.295 ±0.006

y=0.305 ±0.006

White 20% x=0.292 ±0.006

y=0.301 ±0.006

Remarks The numeric values shown above are for MINOLTA CA-210.

(Reference) White 80%...luminance: 220 cd/m2, About 8000K

White 20%...luminance: 9 cd/m2, About 8400K

4) WB adjustment range R/G/B CUTOFF2: –20 to +20 (G CUTOFF2 fixed at 0) R/G/B GAIN: 36 to 64 (One of the colors fixed at 64)

LC-20B6U-S

3.Factory setting

(1) Factory adjustment procedure

While holding down the "INPUT" and "VOLUME (–)" keys on the set, turn ON the power and press the "CH (ù)" and "VOLUME (+)" keys at once.

(2) DESCRIPTION OF FACTORY SETTINGS

ITEM SETTING

OTHER THAN MENU STARTUP OF EZ SETUP AT POWER-ON ON

SELECT LANGUAGE ENGLISH CH-SETTING ON

AUTO CLOCK ON LAST CHANNEL 2ch LAST TV/INPUT TV FLASH BACK 2ch VOLUME 20

MENU-PICTURE AV MODE DYNAMIC OPC OFF BACKLIGHT BRIGHT (17) CONTRAST 56 BRIGHTNESS 0 COLOR +2 TINT 0 SHARPNESS +4 ADVANCED COLOR TEMP. MIDDLE

RED 0

GREEN 0

BLUE 0

I/P SETTING PROGRESSIVE

NOISE CLEAN OFF

FILM MODE OFF

QUICK SHOOT ON

FOR STANDARD OFF OFF OFF BRIGHT (17) BRIGHT (17) NORMAL(9) 50 50 50 000 0+20 000 000

FOR MOVIE FOR GAME

MENU-AUDIO TREBLE 0 BASS 0 BALANCE 0 WIDE SOUND OFF SPEECH EMPHASIS OFF PC SOUND SELECT PC

LC-20B6U-S

MENU-SETUP CH-SETTING AIR/CABLE AIR

CH MEMORY SKIP ALL CH ON MTS STEREO CLOCK SET AUTO EDS CH AUTO

MENU DST OFF

TIME 12:00AM

TIME DISPLAY ON COMP. 2/AV1 SELECT COMPONENT2 AV2 IN/OUT IN V-CHIP BLOCK INPUT SECRET NO. CLEAR

MPAA G, PG, PG-13, R, NC-17, X ALL CLEAR

TV GUIDELINES TV-Y, TV-Y7, TV-G, TV-PG, TV-14, TV-MA ALL CLEAR

BLOCK CONTENT D, L, S, V, FV ALL CLEAR CAN. ENGLISH RATINGS C, C8+, G, PG, 14+, 18+ ALL CLEAR CAN. FRENCH RATINGS G, 8 ans+, 13 ans+, 16 ans+, 18 ans+ ALL CLEAR STATUS OFF

CLOSED CAPTION OFF COLOR SYSTEM (FOR TV) N358 COLOR SYSTEM (FOR AV 1 AND 2) AUTO PC SETTING INPUT SIGNAL 1024 x 768

FINE SYNC. H. POS. 0

V. POS. 0

CLOCK 0

PHASE 0

LANGUAGE ENGLISH MENU-OPTION

VIEW MODE 4 : 3 AUDIO ONLY OFF SLEEP TIMER OFF WAKEUP TIMER TIMER OFF

TIME 12:00AM CHANNEL 2 VOLUME 20

NO SIGNAL OFF DISABLE NO OPERATION OFF DISABLE POWER MANAGEMENT OFF PICTURE FLIP NORMAL

ADJUSTMENT PROCESS 1st LEVEL ITEM DEFAULT TABLE

Page No. Item

BASIC SETTING

1 MODEL A625

INCH SIZE 20

ERROR NO RESET 0 PUBLIC MODE OFF V-CHIP 1 CANADIAN VCHIP ON EXT CONTROL OFF

BLUE BACK 0 BLUE BACKGROUND ON•OFF SETTING NOT USED ROM AND GAIBU VERSION NUMBERS SHOULD BE DISPLAYED AT THE BOTTOM.

Initial

Value (Do not change other items than designated.)

MODEL NAME SELECTION CANNOT BE CHANGED. INCH SIZE SELECTION

LAMP ERROR COUNT & RESET REFER TO LAMP ERROR DETECTION. HOTEL MODE SETTING NOT USED VCHIP LINE MUTE SETTING NOT USED CANADIAN VCHIP SETTING NOT USED BUS UART OPEN NOT USED

Function

LC-20B6U-S

Response precautions on servicing

USED FOR INITIALIZATION. MUST NOT BE CHANGED IN OTHER CASES. IF CHANGED, IT IS NECESSARY TO PERFORM DATA REWRITING AND READJUSTING

VIDEO ADJUSTMENT

2 COM BIAS 427

TAMP L 157 YDATA —

TAMP H 160 NTSC TAMP 70 TAMP ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. PAL-M TAMP 70 TAMP ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. PAL-N TAMP 70 TAMP ADJUSTMENT REFER TO METHOD OF ADJUSTMENT.

BACKGROUND ADJUSTMENT

3 R CUTOFF 0

G CUTOFF 0 GREEN CUTOFF ADJUSTMENT REFER T O METHOD OF ADJUSTMENT. B CUTOFF 0 BLUE CUTOFF ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. GAIN1 64 WHITE BALANCE ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. GAIN2 64 WHITE BALANCE ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. REF 0 REFERENCE SETTING REFER TO METHOD OF ADJUSTMENT. R CUTOFF2 0 RED CUTOFF ADJUSTMENT REFER T O METHOD OF ADJUSTMENT. G CUTOFF2 0 GREEN CUTOFF ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. B CUTOFF2 0 BLUE CUTOFF ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. R-GAIN 64 WHITE BALANCE ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. G-GAIN 64 WHITE BALANCE ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. B-GAIN 64 WHITE BALANCE ADJUSTMENT REFER TO METHOD OF ADJUSTMENT.

525I/625I/525P/625P BACKGROUND ADJUSTMENT

4 A R CUTOFF 0

A G CUTOFF 0 A B CUTOFF 0 A GAIN1 64 A GAIN2 64 A REF 0 A R CUTOFF2 0 A G CUTOFF2 0 A B CUTOFF2 0 A R-GAIN 64 A G-GAIN 64 A B-GAIN 64

COMMON BIAS ADJUSTMENT NOT USED Y LOWER LIMIT SETTING FOR TAMP ADJUSTMENT Y UPPER LIMIT SETTING FOR TAMP ADJUSTMENT Y UPPER LIMIT SETTING FOR TAMP ADJUSTMENT

RED CUTOFF ADJUSTMENT REFER TO METHOD OF ADJUSTMENT.

525I/625I/525P/625P RED CUTOFF ADJUSTMENT 525I/625I/525P/625P GREEN CUTOFF ADJUSTMENT 525I/625I/525P/625P BLUE CUTOFF ADJUSTMENT 525I/625I/525P/625P WHITE BALANCE ADJUSTMENT 525I/625I/525P/625P WHITE BALANCE ADJUSTMENT 525I/625I/525P/625P REFERENCE SETTING 525I/625I/525P/625P RED CUTOFF ADJUSTMENT 525I/625I/525P/625P GREEN CUTOFF ADJUSTMENT 525I/625I/525P/625P BLUE CUTOFF ADJUSTMENT 525I/625I/525P/625P WHITE BALANCE ADJUSTMENT 525I/625I/525P/625P WHITE BALANCE ADJUSTMENT 525I/625I/525P/625P WHITE BALANCE ADJUSTMENT

NOT USED REFER TO METHOD OF ADJUSTMENT. NOT USED

REFER TO METHOD OF ADJUSTMENT. REFER TO METHOD OF ADJUSTMENT. REFER TO METHOD OF ADJUSTMENT. REFER TO METHOD OF ADJUSTMENT. REFER TO METHOD OF ADJUSTMENT. REFER TO METHOD OF ADJUSTMENT. REFER TO METHOD OF ADJUSTMENT. REFER TO METHOD OF ADJUSTMENT. REFER TO METHOD OF ADJUSTMENT. REFER TO METHOD OF ADJUSTMENT. REFER TO METHOD OF ADJUSTMENT. REFER TO METHOD OF ADJUSTMENT.

LC-20B6U-S

Page No. Item

1125I/750P BACKGROUND ADJUSTMENT

5 D R CUTOFF 0

D G CUTOFF 0 1125I/750P D B CUTOFF 0 1125I/750P D GAIN1 64 1125I/750P D GAIN2 64 1125I/750P D REF 0 1125I/750P D R CUTOFF2 0 1125I/750P D G CUTOFF2 0 1125I/750P D B CUTOFF2 0 1125I/750P D R-GAIN 64 1125I/750P D G-GAIN 64 1125I/750P D B-GAIN 64 1125I/750P

PC BACKGROUND ADJUSTMENT

6 PC R CUTOFF 0

PC G CUTOFF 0 PC GREEN CUTOFF ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. PC B CUTOFF 0 PC BLUE CUTOFF ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. PC GAIN1 64 PC WHITE BALANCE ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. PC GAIN2 64 PC WHITE BALANCE ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. PC REF 0 PC PREFERENCE SETTING REFER TO METHOD OF ADJUSTMENT. PC R CUTOFF2 0 PC RED CUTOFF ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. PC G CUTOFF2 0 PC GREEN CUTOFF ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. PC B CUTOFF2 0 PC BLUE CUTOFF ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. PC R-GAIN 64 PC WHITE BALANCE ADJUSTMENT REFER T O METHOD OF ADJUSTMENT. PC G-GAIN 64 PC WHITE BALANCE ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. PC B-GAIN 64 PC WHITE BALANCE ADJUSTMENT REFER TO METHOD OF ADJUSTMENT.

Initial

Value (Do not change other items than designated.)

1125I/750P

PC RED CUTOFF ADJUSTMENT REFER TO METHOD OF ADJUSTMENT.

Function

RED CUTOFF ADJUSTMENT

GREEN CUTOFF ADJUSTMENT BLUE CUTOFF ADJUSTMENT WHITE BALANCE ADJUSTMENT WHITE BALANCE ADJUSTMENT PREFERENCE SETTING RED CUTOFF ADJUSTMENT GREEN CUTOFF ADJUSTMENT BLUE CUTOFF ADJUSTMENT WHITE BALANCE ADJUSTMENT WHITE BALANCE ADJUSTMENT WHITE BALANCE ADJUSTMENT

Response precautions on servicing

REFER TO METHOD OF ADJUSTMENT . REFER TO METHOD OF ADJUSTMENT . REFER TO METHOD OF ADJUSTMENT . REFER TO METHOD OF ADJUSTMENT . REFER TO METHOD OF ADJUSTMENT . REFER TO METHOD OF ADJUSTMENT . REFER TO METHOD OF ADJUSTMENT . REFER TO METHOD OF ADJUSTMENT . REFER TO METHOD OF ADJUSTMENT . REFER TO METHOD OF ADJUSTMENT . REFER TO METHOD OF ADJUSTMENT . REFER TO METHOD OF ADJUSTMENT .

1125I/750P AD ADJUSTMENT

7 AD9883 DATA 0 AD9883 DATA WRITE AND READ NOT USED

AD9883 DATA WAIT WRITE AND READ EXECUTION NOT USED AUTO GAIN-OFFSET1 OFF

AD R GAIN 30 AD G GAIN 125 AD B GAIN 30 AD R OFFSET 64 AD G OFFSET 50 AD B OFFSET 64 RGTAR E0

GGTAR 98 BGTAR E0 RGCAL — GGCAL — BGCAL — ROCAL — GOCAL — BOCAL —

AD9883 GAIN AND OFFSET AUTO ADJUSTMENT OFF/RUN 1125I/750P INPUT RED GAIN ADJUSTMENT

1125I/750P INPUT GREEN GAIN ADJUSTMENT 1125I/750P INPUT BLUE GAIN ADJUSTMENT 1125I/750P INPUT RED OFFSET ADJUSTMENT 1125I/750P INPUT GREEN OFFSET ADJUSTMENT 1125I/750P INPUT BLUE OFFSET ADJUSTMENT 1125I/750P INPUT RED OFFSET ADJUSTMENT 1125I/750P INPUT GREEN OFFSET ADJUSTMENT 1125I/750P INPUT BLUE OFFSET ADJUSTMENT DISPLAY OF Y LEVEL CHROMA CALCULATED VALUE

DISPLAY OF Y LEVEL CHROMA CALCULATED VALUE DISPLAY OF Y LEVEL CHROMA CALCULATED VALUE DISPLAY OF Y LEVEL WHITE LEVEL CALCULATED VALUE OF CLAMP AREA DISPLAY OF Y LEVEL WHITE LEVEL CALCULATED VALUE OF CLAMP AREA DISPLAY OF Y LEVEL WHITE LEVEL CALCULATED VALUE OF CLAMP AREA

NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED

LC-20B6U-S

Page No. Item

PC AD ADJUSTMENT

8 AUTO GAIN-OFFSET2 OFF

PCAD R GAIN 130 PC INPUT RED GAIN ADJUSTMENT REFER T O METHOD OF ADJUSTMENT. PCAD G GAIN 130 PCAD B GAIN 130 PCAD R OFFSET 56 PC INPUT RED OFFSET ADJUSTMENT REFER TO METHOD OF ADJUSTMENT. PCAD G OFFSET 56 PCAD B OFFSET 56 RGTAR AC

GGTAR AC BGTAR AC RGCAL — GGCAL — BGCAL — ROCAL — GOCAL — BOCAL —

TABLE OF CONTENTS FOR SETTINGS

9 I2C DATA

I2C DATA WAIT WRITE AND READ EXECUTION NOT USED SOUND — TC — G/A — TUNER — OTHERS —

Initial

Value (Do not change other items than designated.)

AD9883 GAIN AND OFFSET AUTO ADJUSTMENT OFF/RUN

PC INPUT GREEN GAIN ADJUSTMENT PC INPUT BLUE GAIN ADJUSTMENT

PC INPUT GREEN OFFSET ADJUSTMENT PC INPUT BLUE OFFSET ADJUSTMENT TARGET VALUE FOR PC INPUT RED GAIN ADJUSTMENT

TARGET VALUE FOR PC INPUT GREEN GAIN ADJUSTMENT TARGET VALUE FOR PC INPUT BLUE GAIN ADJUSTMENT DISPLAY OF Y LEVEL CHROMA CALCULATED VALUE DISPLAY OF Y LEVEL CHROMA CALCULATED VALUE DISPLAY OF Y LEVEL CHROMA CALCULATED VALUE DISPLAY OF Y LEVEL WHITE LEVEL CALCULATED VALUE OF CLAMP AREA DISPLAY OF Y LEVEL WHITE LEVEL CALCULATED VALUE OF CLAMP AREA DISPLAY OF Y LEVEL WHITE LEVEL CALCULATED VALUE OF CLAMP AREA

000000000000

I2C BUS CONTROL C DATA WRITE AND READ

SHIFTING TO SOUND ADJUSTMENT PAGE SHIFTING TO TC ADJUSTMENT PAGE SHIFTING TO G/A ADJUSTMENT PAGE SHIFTING TO TUNER ADJUSTMENT PAGE SHIFTING TO OTHERS ADJUSTMENT PAGE

Function

Response precautions on servicing

REFER TO METHOD OF ADJUSTMENT.

REFER TO METHOD OF ADJUSTMENT. REFER TO METHOD OF ADJUSTMENT.

NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED

NOT USED

SHIFTING TO SOUND ADJUSTMENT PAGE WITH ENTER KEY SHIFTING TO TC ADJUSTMENT PAGE WITH ENTER KEY SHIFTING TO G/A ADJUSTMENT PAGE WITH ENTER KEY SHIFTING TO TUNER ADJUSTMENT PAGE WITH ENTER KEY SHIFTING TO OTHERS ADJUSTMENT PAGE WITH ENTER KEY

AUDIO ADJUSTMENT PROCESS SPECIFICATIONS

Page No. Item

AUDIO ADJUSTMENT

SOUND1 VOLUME 20 USER VOLUME SETTING NOT USED

AVC OFF AVC SETTING NOT USED MSP DATA MSP DATA WAIT WRITE AND READ EXECUTION NOT USED CARRIER MUTE ON IGR THR 012D IGR THRESH LEVEL NOT USED SP TEST OFF FOR AUDIO TEST NOT USED

AUDIO ADJUSTMENT

SOUND2 PRESCALE SCART 27

PRESCALE FM/AM-M 31 PRESCALE SETTING (TV) NOT USED VOICE TEST OFF VOICE LEVEL 6 S. WIDE TEST OFF S. WIDE LEVEL 3F

Initial

Value (Do not change other items than designated.)

0000000000

AUDIO IC MSP DATA WRITE AND READ

AUDIO OUTPUT SETTING WITHOUT TV SYNCHRONIZATION

PRESCALE SETTING (EXTERNAL INPUT)

TREBLE EMPHASIS TEST (VOICE USED) TREBLE EMPHASIS LEVEL SETTING (VOICE USED) SOUND WIDE TEST (SOUND WIDE USED) SOUND WIDE LEVEL SETTING (SOUND WIDE USED)

Function

NOT USED

NOT USED NOT USED NOT USED NOT USED

Response precautions on servicing

LC-20B6U-S

Page No. Item

AUDIO ADJUSTMENT

SOUND3 BASS EQ SET 0

TREB EQ SET 0 EQ LIMIT 00 0 EQ LIMIT 00 +12.0 EQ LIMIT 01 10 EQ LIMIT 01 +12.0 EQ LIMIT 02 20 EQ LIMIT 02 +12.0 EQ LIMIT 03 25 EQ LIMIT 03 +12.0 EQ LIMIT 04 30 EQ LIMIT 04 +12.0 EQ LIMIT 05 35 EQ LIMIT 05 +12.0 EQ LIMIT 06 40 EQ LIMIT 06 +12.0 EQ LIMIT 07 42 EQ LIMIT 07 +12.0 EQ LIMIT 08 44 EQ LIMIT 08 +12.0 EQ LIMIT 09 46 EQ LIMIT 09 +12.0 EQ LIMIT 10 48 EQ LIMIT 10 +12.0 EQ LIMIT 11 50 EQ LIMIT 11 +12.0 EQ LIMIT 12 52 EQ LIMIT 12 +12.0 EQ LIMIT 13 54 EQ LIMIT 13 +12.0 EQ LIMIT 14 56 EQ LIMIT 14 +12.0 EQ LIMIT 15 58 EQ LIMIT 15 +12.0

Initial

Value (Do not change other items than designated.)

USER AUDIO ADJUSTMENT TREBLE VALUE USER AUDIO ADJUSTMENT BASS VALUE EQUALIZER LIMIT TABLE 00: VOLUME SETTING EQUALIZER LIMIT TABLE 00: LIMIT SETTING EQUALIZER LIMIT TABLE 01: VOLUME SETTING EQUALIZER LIMIT TABLE 01: LIMIT SETTING EQUALIZER LIMIT TABLE 02: VOLUME SETTING EQUALIZER LIMIT TABLE 02: LIMIT SETTING EQUALIZER LIMIT TABLE 03: VOLUME SETTING EQUALIZER LIMIT TABLE 03: LIMIT SETTING EQUALIZER LIMIT TABLE 04: VOLUME SETTING EQUALIZER LIMIT TABLE 04: LIMIT SETTING EQUALIZER LIMIT TABLE 05: VOLUME SETTING EQUALIZER LIMIT TABLE 05: LIMIT SETTING EQUALIZER LIMIT TABLE 06: VOLUME SETTING EQUALIZER LIMIT TABLE 06: LIMIT SETTING EQUALIZER LIMIT TABLE 07: VOLUME SETTING EQUALIZER LIMIT TABLE 07: LIMIT SETTING EQUALIZER LIMIT TABLE 08: VOLUME SETTING EQUALIZER LIMIT TABLE 08: LIMIT SETTING EQUALIZER LIMIT TABLE 09: VOLUME SETTING EQUALIZER LIMIT TABLE 09: LIMIT SETTING EQUALIZER LIMIT TABLE 10: VOLUME SETTING EQUALIZER LIMIT TABLE 10: LIMIT SETTING EQUALIZER LIMIT TABLE 11: VOLUME SETTING EQUALIZER LIMIT TABLE 11: LIMIT SETTING EQUALIZER LIMIT TABLE 12: VOLUME SETTING EQUALIZER LIMIT TABLE 12: LIMIT SETTING EQUALIZER LIMIT TABLE 13: VOLUME SETTING EQUALIZER LIMIT TABLE 13: LIMIT SETTING EQUALIZER LIMIT TABLE 14: VOLUME SETTING EQUALIZER LIMIT TABLE 14: LIMIT SETTING EQUALIZER LIMIT TABLE 15: VOLUME SETTING EQUALIZER LIMIT TABLE 15: LIMIT SETTING

Function

Response precautions on servicing

NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED

AUDIO ADJUSTMENT

SOUND4 HPF VDS OFF 60

AUDIO ADJUSTMENT

SOUND8 BAND1 MIN TV -0400 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER -0400

BAND1 CNT TV +0400 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER +0400

BAND1 MAX TV +1200 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER +1200

BAND2 MIN TV -0200 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER -0200

BAND2 CNT TV +0150 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER +0150

BAND2 MAX TV +0500 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER +0500

BAND3 MIN TV -0025 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER -0025

BYPASS FILTER SETTING FOR DOLBY VIRTUAL OFF

EQUALIZER SETTING (OTHER THAN TV INPUT)

NOT USED

LC-20B6U-S

Page No. Item

AUDIO ADJUSTMENT

SOUND9 BAND4 MIN TV -0400 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER -0400

BAND4 CNT TV +0050 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER +0050

BAND4 MAX TV +0500 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER +0500

BAND5 MIN TV -1150 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER -1150

BAND5 CNT TV -0050 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER -0050

BAND5 MAX TV +1050 EQUALIZER SETTING (TV INPUT) NOT USED

OTHER +1050

Initial

Value (Do not change other items than designated.)

EQUALIZER SETTING (OTHER THAN TV INPUT)

Function

NOT USED

TC90203 ADJUSTMENT PROCESS ITEM

Page No. Item

TC1 TC DATA 000 00 —

TC TEST PATTERN OFF TEST PATTERN SELECT NOT USED

TC2 OSD VS 0020

OSD HS 0030 OSD VE 0021 OSD VD END TIMING CORRECTION NOT USED OSD HE 009F OSD HD END TIMING CORRECTION NOT USED XGA OSD VS 001A XGA OSD HS 0030 XGA OSD VE 001B XGA OSD HE 00B8 VGA OSD VS 001E VGA OSD HS 0030 VGA OSD VE 001F VGA OSD HE 0060

TC3 N358 TV CONT 96 N358 VIDEO SETTING (TV) NOT USED

N358 AV CONT 96 N358 TV SUBCONT +5 N358 SUB-CONTRAST SETTING (TV) NOT USED N358 AV SUBCONT +1 1 N358 TV BRIGHT -7 N358 BRIGHTNESS SETTING (TV) NOT USED N358 AV BRIGHT -7 N358 TV COLOR 188 N358 AV COLOR 174 N358 TV TINT 52 N358 TINT SETTING (TV) NOT USED N358 AV TINT 44 N358 TV SHARP 45 N358 SHARPNESS SETTING (TV) NOT USED N358 AV SHARP 45

TC4 N443 AV CONT 96

N443 AV SUBCONT +1 1 N443 AV BRIGHT -7 N443 AV COLOR 174 N443 AV TINT 44 N443 AV SHARP 45

TC5 PAL AV CONT 96

PAL AV SUBCONT +11 PAL AV BRIGHT -7 PAL AV COLOR 168 PAL AV TINT 44 PAL AV SHARP 26

Initial

Value (Do not change other items than designated.)

GENERAL-PURPOSE VARIABLE ADJUSTMENT ITEM FOR TC90203 REVIEW

OSD VD START TIMING CORRECTION OSD HD START TIMING CORRECTION

OSD VD START TIMING CORRECTION FOR PC XGA OSD HD START TIMING CORRECTION FOR PC XGA OSD VD END TIMING CORRECTION FOR PC XGA OSD HD END TIMING CORRECTION FOR PC XGA OSD VD START TIMING CORRECTION FOR PC VGA OSD HD START TIMING CORRECTION FOR PC VGA OSD VD END TIMING CORRECTION FOR PC VGA OSD HD END TIMING CORRECTION FOR PC VGA

N358 VIDEO SETTING (COMPOSITE, S VIDEO)

N358 SUB-CONTRAST SETTING (COMPOSITE, S VIDEO)

N358 BRIGHTNESS SETTING (COMPOSITE, S VIDEO) N358 COLOR STRENGTH SETTING (TV) N358 COLOR STRENGTH SETTING (COMPOSITE, S VIDEO)

N358 TINT SETTING (COMPOSITE, S VIDEO)

N358 SHARPNESS (COMPOSITE, S VIDEO) N443 VIDEO SETTING (COMPOSITE, S VIDEO) N443 SUB-CONTRAST SETTING (COMPOSITE, S VIDEO) N443 BRIGHTNESS SETTING (COMPOSITE, S VIDEO) N443 COLOR STRENGTH SETTING (COMPOSITE, S VIDEO) N443 TINT SETTING (COMPOSITE, S VIDEO) N443 SHARPNESS (COMPOSITE, S VIDEO) PAL VIDEO SETTING (COMPOSITE, S VIDEO) PAL SUB-CONTRAST SETTING (COMPOSITE, S VIDEO) PAL BRIGHTNESS SETTING (COMPOSITE, S VIDEO) PAL COLOR STRENGTH SETTING (COMPOSITE, S VIDEO) PAL TINT SETTING (COMPOSITE, S VIDEO) PAL SHARPNESS (COMPOSITE, S VIDEO)

Function

NOT USED

NOT USED NOT USED

NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED

NOT USED

NOT USED NOT USED NOT USED

NOT USED

NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED

Response precautions on servicing

LC-20B6U-S

Page No. Item

TC6 SECAM AV CONT 96

SECAM AV SUBCONT +11 SECAM AV BRIGHT -7 SECAM AV COLOR 168 SECAM AV TINT 44 SECAM AV SHARP 26

TC7 PAL60 A V CONT 96

PAL60 AV SUBCONT +11 PAL60 AV BRIGHT -7 PAL60 AV COLOR 168 PAL60 AV TINT 44 PAL60 AV SHARP 45

TC8 PAL-M TV CONT 96 PAL-M VIDEO SETTING (TV) NOT USED

PAL-M A V CONT 96 PAL-M TV SUBCONT +5 PAL-M A V SUBCONT +11 PAL-M TV BRIGHT -7 PAL-M BRIGHTNESS SETTING (TV) NOT USED PAL-M A V BRIGHT -7 PAL-M TV COLOR 168 PAL-M A V COLOR 168 PAL-M TV TINT 44 PAL-M TINT SETTING (TV) NOT USED PAL-M A V TINT 44 PAL-M TV SHARP 45 PAL-M SHARPNESS SETTING (TV) NOT USED PAL-M A V SHARP 45

TC9 PAL-N TV CONT 96 PAL-N VIDEO SETTING (TV) NOT USED

PAL-N A V CONT 96 PAL-N TV SUBCONT +5 PAL-N A V SUBCONT +11 PAL-N TV BRIGHT -7 PAL-N BRIGHTNESS SETTING (TV) NOT USED PAL-N A V BRIGHT -7 PAL-N TV COLOR 168 PAL-N A V COLOR 168 PAL-N TV TINT 44 PAL-N TINT SETTING (TV) NOT USED PAL-N A V TINT 44 PAL-N TV SHARP 26 PAL-N SHARPNESS SETTING (TV) NOT USED PAL-N A V SHARP 26

TC10 525I CONT 90 525I VIDEO SETTING (COMPONENT) NOT USED

525I SUBCONT +5 525I BRIGHT -7 525I COLOR 142 525I TINT 50 525I TINT SETTING (COMPONENT) NOT USED 525I SHARP 26 525P CONT 92 525P SUBCONT +5 525P BRIGHT -7 525P COLOR 142 525P TINT 50 525P SHARP 26

TC11 625I CONT 90 625I VIDEO SETTING (COMPONENT) NOT USED

625I SUBCONT +5 625I BRIGHT -7 625I COLOR 142 625I TINT 50 625I TINT SETTING ( 625I SHARP 26 625P CONT 92 625P VIDEO SETTING (COMPONENT) NOT USED 625P SUBCONT +5 625P BRIGHT -7 625P COLOR 142 625P TINT 50 625P TINT SETTING (COMPONENT) NOT USED 625P SHARP 26

Initial

Value (Do not change other items than designated.)

SECAM VIDEO SETTING (COMPOSITE, S VIDEO) SECAM SUB-CONTRAST SETTING (COMPOSITE, S VIDEO) SECAM BRIGHTNESS SETTING (COMPOSITE, S VIDEO) SECAM COLOR STRENGTH SETTING (COMPOSITE, S VIDEO) SECAM TINT SETTING (COMPOSITE, S VIDEO) SECAM SHARPNESS (COMPOSITE, S VIDEO) PAL60 VIDEO SETTING (COMPOSITE, S VIDEO) PAL60 SUB-CONTRAST SETTING (COMPOSITE, S VIDEO) PAL60 BRIGHTNESS SETTING (COMPOSITE, S VIDEO) PAL60 COLOR STRENGTH SETTING (COMPOSITE, S VIDEO) PAL60 TINT SETTING (COMPOSITE, S VIDEO) PAL60 SHARPNESS (COMPOSITE, S VIDEO)

PAL-M VIDEO SETTING (COMPOSITE, S VIDEO) PAL-M SUB-CONTRAST SETTING (TV) PAL-M SUB-CONTRAST SETTING (COMPOSITE, S VIDEO)

PAL-M BRIGHTNESS SETTING (COMPOSITE, S VIDEO) PAL-M COLOR STRENGTH SETTING (TV) PAL-M COLOR STRENGTH SETTING (COMPOSITE, S VIDEO)

PAL-M TINT SETTING (COMPOSITE, S VIDEO)

PAL-M SHARPNESS (COMPOSITE, S VIDEO)

PAL-N VIDEO SETTING (COMPOSITE, S VIDEO) PAL-N SUB-CONTRAST SETTING (TV) PAL-N SUB-CONTRAST SETTING (COMPOSITE, S VIDEO)

PAL-N BRIGHTNESS SETTING (COMPOSITE, S VIDEO) PAL-N COLOR STRENGTH SETTING (TV) PAL-N COLOR STRENGTH SETTING (COMPOSITE, S VIDEO)

PAL-N TINT SETTING (COMPOSITE, S VIDEO)

PAL-N SHARPNESS (COMPOSITE, S VIDEO)

525I SUB-CONTRAST SETTING(COMPONENT) 525I BRIGHTNESS SETTING (COMPONENT) 525I COLOR STRENGTH SETTING(COMPONENT)

525I SHARPNESS SETTING(COMPONENT) 525P VIDEO SETTING 525P SUB-CONTRAST SETTING(COMPONENT) 525P BRIGHTNESS SETTING(COMPONENT) 525P COLOR STRENGTH SETTING(COMPONENT) 525P TINT SETTING 525P SHARPNESS

625I SUB-CONTRAST SETTING (COMPONENT) 625I BRIGHTNESS SETTING (COMPONENT) 625I COLOR STRENGTH SETTING (COMPONENT)

625I SHARPNESS SETTING (COMPONENT)

625P SUB-CONTRAST SETTING (COMPONENT) 625P BRIGHTNESS SETTING (COMPONENT) 625P COLOR STRENGTH SETTING (COMPONENT)

625P SHARPNESS (COMPONENT)

Function

NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED

NOT USED NOT USED NOT USED

NOT USED

NOT USED NOT USED NOT USED

NOT USED

NOT USED NOT USED NOT USED

NOT USED

(COMPONENT) NOT USED

NOT USED NOT USED NOT USED

(COMPONENT) NOT USED

NOT USED NOT USED NOT USED

COMPONENT

) NOT USED

NOT USED

NOT USED NOT USED NOT USED

NOT USED

Response precautions on servicing

LC-20B6U-S

Page No. Item

TC12 1125I CONT 96 1125I VIDEO SETTING (COMPONENT) NOT USED

1125I SUBCONT +6 1125I BRIGHT -7 1125I COLOR 142 1125I TINT 50 1125I TINT SETTING (COMPONENT) NOT USED 1125I SHARP 16 750P CONT 96 750P SUBCONT +6 750P BRIGHT -7 750P COLOR 142 750P TINT 50 750P SHARP 16

Initial

Value (Do not change other items than designated.)

1125I SUB-CONTRAST SETTING (COMPONENT) 1125I BRIGHTNESS SETTING (COMPONENT) 1125I COLOR STRENGTH SETTING (COMPONENT)

1125I SHARPNESS SETTING (COMPONENT) 750P VIDEO SETTING (COMPONENT) 750P SUB-CONTRAST SETTING (COMPONENT) 750P BRIGHTNESS SETTING (COMPONENT) 750P COLOR STRENGTH SETTING (COMPONENT) 750P TINT SETTING (COMPONENT) 750P SHARPNESS (COMPONENT)

Function

NOT USED NOT USED NOT USED

NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED

G/A ADJUSTMENT PROCESS ITEM

Page No. Item

LIQUID CRYSTAL COMMON SETTING

G/A 1 G/A TEST PATTERN OFF

G/A DATA 00 —

QS DRIVING TEMPERATURE THRESHOLD SETTING

G/A 2 QS T ABLE TEST OFF FOR QS TEST NOT USED

TABLE SELECT 6 MCU PALA 2 TABLE0-1 -5°C

TABLE1-2 0°C

TABLE2-3 +5°C

TABLE3-4 +10°C

TABLE4-5 +15°C

TABLE5-6 +20°C

TABLE6-7 +25°C

READ TEMP —

Initial

Value (Do not change other items than designated.)

GRAY SCALE TEST PATTERN DISPLAY GENERAL-PURPOSE VARIABLE ADJUSTMENT ITEM FOR GA REVIEW

SELECTION TABLE SETTING FOR QS TEST QS TEMPERATURE TABLE AUTO SETTING TEMPERATURE THRESHOLD SETTING BETWEEN QS SELECTION TABLES 0 AND 1 TEMPERATURE THRESHOLD SETTING BETWEEN QS SELECTION TABLES 1 AND 2 TEMPERATURE THRESHOLD SETTING BETWEEN QS SELECTION TABLES 2 AND 3 TEMPERATURE THRESHOLD SETTING BETWEEN QS SELECTION TABLES 3 AND 4 TEMPERATURE THRESHOLD SETTING BETWEEN QS SELECTION TABLES 4 AND 5 TEMPERATURE THRESHOLD SETTING BETWEEN QS SELECTION TABLES 5 AND 6 TEMPERATURE THRESHOLD SETTING BETWEEN QS SELECTION TABLES 6 AND 7 DISPLAYING THE TEMPERATURE SENSOR READING

Function

REFER TO TEST PATTERN OF ADJUSTMENT PROCESS MODE. NOT USED

NOT USED NOT USED NOT USED

NOT USED

Response precautions on servicing

ADJUSTMENT PROCESS TUNER ITEM DEFAULT TABLE

Page No. Item

BASIC SETTING

TUNER1 AFT UP 1.80

AFT DOWN 1.20 LSYNC 1000 HSYNC 1048 AVSYNC 5000

TUNER2 AIR SERCH 1.600

EDS TEST 10

AFT FARTIME 50 AFT NEARTIME 30 AFT NEARMTIME 10 AFT 1STEPTIME 10 AFT CSYNCTIME 50

Initial

Value (Do not change other items than designated.)

AFT VOLTAGE REFERENCE VALUE (ALL BANDS) AFT VOLTAGE REFERENCE VALUE (ALL BANDS) SYNC DETERMINATION THRESHOLD (TV) SYNC DETERMINATION THRESHOLD (TV) SYNC DETERMINATION THRESHOLD (EXTERNAL INPUT) LAST SYNC DETERMINATION FREQUENCY FOR AIR CH SEARCH TIME (SECOND) FOR DETERMINATION OF ABSENCE OF EDS TIME DATA CHANNEL PRESET TIME ADJUSTMENT 1 CHANNEL PRESET TIME ADJUSTMENT 2 CHANNEL PRESET TIME ADJUSTMENT 3 CHANNEL PRESET TIME ADJUSTMENT 4 CHANNEL PRESET TIME ADJUSTMENT 5

Function

Response precautions on servicing

NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED

NOT USED NOT USED NOT USED NOT USED NOT USED

LC-20B6U-S

ADJUSTMENT PROCESS OTHERS ITEM DEFAULT TABLE

Page No. Item

TADJUSTMENT PROCESS OTHERS ITEM DEFAULT TABLE

OTHERS1 DAC DATA —

L ERROR WAIT 15s L ERROR H TIME 1.0s LAMP ERROR DETECTION TIME NOT USED AV AUTO GAIN OFF AUTO GAIN SETTING FOR TV NOT USED TV OSD 0 NTSC PWM FREQ 0293 NTSC PWM DUTY 0 LIGHT CONTROL DUTY SETTING NOT USED PAL PWM FREQ 0258 PAL PWM DUTY 0 OPC THRESHOLD 24

HOTEL POWERFIX OFF COMP SYSTEM AUTO REMOCON CODE SHOULD BE DISPLAYED AT THE BOTTOM.

OTHERS2 CLOSED CAPTION 15 CLOSED CAPTION THRESHLEVEL NOT USED

CCD ISO 16 CLOSED CAPTION PHASE SETTING NOT USED EZ SETUP ON

Initial

Value (Do not change other items than designated.)

GENERAL-PURPOSE VARIABLE

Function

NOT USED ADJUSTMENT ITEM FOR DAC REVIEW LAMP ERROR DETECTION WAIT TIME

DISPLAY POSITION SETTING FOR OTHER THAN CARD LIGHT CONTROL FREQUENCY SETTING

LIGHT CONTROL FREQUENCY SETTING (50Hz) LIGHT CONTROL DUTY SETTING (50Hz) INPUT LEVEL THRESHOLD FOR SHIFTING FROM

NOT USED

NOT USED BRIGHTNESS SENSOR STOP MODE TO OPERATION MODE SETTING FOR HOTEL MODE POWER SUPPLY ON FIXED COMPONENT SIGNAL SELECTION IN ADJUSTMENT PROCESS

PRESENCE OR ABSENCE OF DISPLAY OF EZ SET UP

NOT USED

Response precautions on servicing

EDS DATA SHOULD DISPLAYED AT THE BOTTOM

Adjustment process auto clock display

01234567891011121314151617181920212223242526272829303132333435363738 0OTH 1 CLOSED CAPTI ON 2CCDISO 3EZSETUP 4 5 6 7 8 9

10 00 00 00 00: 00. 0 00

11 D 0 L 0 Z 0 D 0 12 0 0 0 0 13

RS 2

Time of Day (Greenwich Mean Time)

0~23 0~59 1990+X 1~12 1~31 ~7 0~23 TIME MIN YEAR MONTH DAY WEEK TIME

1(=SUN)

Local Time Zone & DST Use

Time of Day (Greenwich Mean Time)

D bit

* In the adjustment process, the local time can be freely obtained. Each time the local time is known, the colors of the following items change accordingly. (1) Time of Day (Greenwich Mean Time) (2) Local Time Zone & DST Use (3) Start code

Reset SEC

L bit Z bit D bit

Start code

Test pattern in the adjustment process mode

IC1201 (LCD controller) test pattern

1) Getting the test pattern displayed Call the adjustment process mode, select "G/A" on page 4, and press the ENTER button. Next select "G/A TEST PATTERN" in line 1 on page 1. (The "G/A TEST PATTERN" turns yellow.) Now use the cursor RIGHT/ LEFT keys to get the test pattern displayed. To turn off the test pattern, use the cursor RIGHT/LEFT keys again. If the cursor UP/DOWN keys are wrongly pressed and the cursor RIGHT/LEFT keys become ineffective, just turn OFF the power.

2) Test pattern displayed The following test pattern appears onscreen.

Gray scale gradation

Red gradation Green gradation

LC-20B6U-S

Blue gradation

Gray scale single color

256 dot256 dot256 dot256 dot

LC-20B6U-S

No or Wrong Picture

Are the waveforms at

pins (50), (54), (55), and

(57) of IC1201 as

specified?

Check IC1201 and its

peripheral circuits as

well as the LCD panel

voltage and waveform.

Check the related lines,

IC801 itself and its

peripheral circuits.

Are the waveforms at the signal

input pins of IC801 as specified?

TV/Composite … Pin (216)

S Video … Pins (216) and (131)

Component … Pins (133), (135) and

(218)

Check the IC801 signal

input line.

Check IC801 and its

peripheral circuits.

Yes

Does the IC1201 test pattern appear

properly?

No Power (Power LED indicator still in red)

Go to the adjustment process mode.

Move the cursor to ERROR NO RESET

and click on it (to reset to zero).

Turn off the power.

Is the power turned on again?

MODEL A625

INCH SIZE 20

ERROR NO RESET 0

PUBLIC MODE OFF

V-CHIP 1

CANADIAN VCHIP ON

EXT CONTROL OFF

BLUE BACK 0

VER ROM 1.05A GAIBU 1.050

Note:

This model is equipped with the lamp error detection function that detects the current

flowing into the fluorescent lamp and protects the backlight lamp drive circuit.

If a lamp error is detected, the microprocessor interrupts the unit and the ERROR NO

RESET setting will go up.

When the ERROR NO RESET setting has reached "5", the microprocessor turns and

keeps off the unit's power. To resume the power, take the above procedure to clear the

ERROR NO RESET setting.

Check the following points.

(1) Backlight lamp

(2) Inverter circuit Sub PWB F6701, Q6701, Q6702, Q6703, Q6704, Q6705,

Q6707, Q6708, Q6709, Q6710, Q6711, Q6712 and their peripheral parts as

well as pins (177) and (178) of IC1201, Q3701

(3) Lamp error detection circuit Q6717, Q6718, IC6702, and their peripheral parts

as well as pin (42) of IC2001

TROUBLE SHOOTING TABLE

TROUBLE SHOOTING TABLE (Continued)

No sounds or pictures come out.

Check if the adjustment process menu of the microcomputer is set properly.

The fluorescent lamp does not go on.

Are F3701 and F3702 normal?

Yes

No No

Yes

Are +35V, +9V and -12V

of the secondary-side

output of T701 normal?

Are pins (14) of IC701-

IC705 and IC707 normal?

(1.35V-2.05V)

Check the load side.

Is pin (178) of IC1201 at

"H"?

Are Q6705-Q6712 free

from short-circuit?

Check Q6705-Q6712 and

their peripheral parts.

Is the oscillation waveform

of the primary side of

T6701- T6712 normal?

Replace and check the

fluorescent lamp.

Check the peripheral

parts of Q6701-Q6704

and the connecting cable.

Are the primary-side

peripheral parts of T701,

and SC701, Q716 and

Q715 free from short-

circuit?

Is the load side free from

short-circuit when F3701

and F3702 are

disconnected?

Replace F3701 and

F3702.

Is F6701 normal? Replace F6701.

Check the line in question,

IC1201 and its peripheral

parts.

Check SC701 and the

connecting cable.

Check the peripheral

parts of J3701 and the

connecting cable.

LC-20B6U-S

(480i, 480p)

(1080i, 720p)

No pictures come out (1/2).

All pictures do not come out.

No TV pictures come out.

No video 1 pictures come out. No video 2 pictures come out.

Check if the adjustment process menu of the microcomputer is set properly.

No No No No

Yes

No S video pictures come out.

Yes

No component 2 pictures come out.

Yes

No pictures come out (2/2).

No PC pictures come out.

Yes

Does the

test pattern

of the LCD

controller

come out?

Are the

input and

output of

IC801 as

specified?

No TV, video 1 or video 2

pictures come out.

Check

IC1201, its

peripheral

circuitry and

the LCD

panel.

Check

IC801 and

its

peripheral

circuitry.

Is the input

at pin

(216) of

IC801 as

specified?

Check the

IC801 VIDEO

line and its

peripheral

parts.

Is the output

at pin (19) of

the tuner as

specified?

Are the

input and

output of

IC3401 as

specified?

Check

IC3401 and

its peripheral

parts.

Check the

power supply

line.

Check the

line in

question.

Check

IC3401 and

its peripheral

parts.

Check the

tuner and its

peripheral

parts.

Check the line

in question.

Check

IC3401 and

its peripheral

parts.

Are the

voltages at

pins (6), (7)

and (9) of the

tuner as

specified?

Is the input

at pin (47)

of IC3401

specified?

Is the

output at

pin (43) of

IC3401 as

specified?

Check the

line in

question.

Is the

output at

pin (43) of

IC3401 as

specified?

Is the input

at pin (1) of

IC3401 as

specified?

Check the

line in

question.

Check

IC3401 and

its peripheral

parts.

Is the input

at pin (8) of

IC3401 as

specified?

Is the

output at

pin (43) of

IC3401 as

specified?

Yes Yes

Yes

Is the input

at pin (216)

of IC801 as

specified?

Is the input

at pin (216)

of IC801 as

specified?

Check

IC801 and

its input

line and

peripheral

parts.

Check

IC801 and

its input

line and

peripheral

parts.

Check

IC801 and

its input

line and

peripheral

parts.

Are the inputs at pins

(3), (6) and (10) of

IC403 as specified?

Is the voltage at pin (16)

of IC403 as specified?

Are the outputs at pins

(4), (7) and (9) of IC403

as specified?

Are the inputs at pins

(43), (48) and (54) of

IC8701 as specified?

Is the output of IC8701

as specified?

Is the input of IC801 as

specified?

Yes

Check the output of IC801,

the input and output of

IC1201 and their

peripheral parts.

Are the

inputs at pins

(3) and (5) of

IC3401 as

specified?

Check the

SY line, SC

line and

peripheral

parts of

J3401.

Check the

lines and

peripheral

parts of

J3408.

Check

J3401 and

its

peripheral

parts.

Are the

outputs at

pins (43)

and (45) of

IC3401 as

specified?

Are the

inputs at

pins (131)

and (216) of

IC801 as

specified?

Are the

inputs at

pins (3),

(7) and

(27) of

IC3403 as

specified?

No component 1 pictures come out.

Yes

Check the

lines and

peripheral

parts of

J3407.

Are the

inputs at

pins (1), (5)

and (25) of

IC3403 as

specified?

Check

IC3403 and

its

peripheral

parts.

Are the

outputs at

pins (11),

(14) and (17)

of IC3403 as

specified?

Check the input line

and its peripheral

parts.

Check Q401, Q402

and Q403.

Check the power

supply line.

Check the line in

question.

Check IC8701 and

its peripheral parts.

Check IC801 and

its peripheral parts.

Yes

Check Q404, Q405

and Q406 and their

peripheral parts.

Are the inputs at pins

(2), (5) and (11) of

IC403 as specified?

Yes

Check the input line

and its peripheral

parts.

Check IC8701 and

its peripheral parts.

Check IC801 and its

peripheral parts.

Yes

Is the output of IC8701

as specified?

Are the inputs at pins (43),

(49), (48) and (54) of

IC8701 as specified?

Is the input of IC801 as

specified?

Check the output of IC801,

the input and output of

IC1201 and their

peripheral parts.

Yes

Are the inputs at pins

(218), (133) and (135) of

IC801 as specified?

Check the output of

IC801, the input and

output of IC1201 and

their peripheral parts.

Check IC801 and its

input line and

peripheral parts.

Check if the adjustment process menu of the microcomputer

is set properly.

TROUBLE SHOOTING TABLE (Continued)

+ 74 hidden pages