sharp LC10A2U Service Manual

SERVICE MANUAL LCD COLOR TELEVISION

LC-10A2U

SERVICE MANUAL

S40Z6LC-10A2U

LCD COLOR TELEVISION

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

» ELECTRICAL SPECIFICATIONS......................................................................................................... 4

» OPERATION MANUAL ......................................................................................................................... 5

» SUPPLIED ACCESSORIES ................................................................................................................. 6

» DISASSEMBLY OF THE SET............................................................................................................... 7

» ADJUSTING PROCEDURE OF EACH SECTION ............................................................................. 10

» TROUBLE SHOOTING TABLE ........................................................................................................... 12

» CHASSIS LAYOUT ............................................................................................................................. 16

MODEL LC-10A2U

» BLOCK DIAGRAM.............................................................................................................................. 18

» DESCRIPTION OF SCHEMATIC DIAGRAM ..................................................................................... 19

» SCHEMATIC DIAGRAM ..................................................................................................................... 20

» PRINTED WIRING BOARD ASSEMBLIES........................................................................................ 28

» PARTS LIST

» PACKING OF THE SET ...................................................................................................................... 42

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 be used.

LC-10A2U

CONTENTS

ELECTRICAL PARTS..................................................................................................................... 33

MAIN UNIT ..................................................................................................................................... 33

TERMINAL UNIT............................................................................................................................ 37

OPERATION UNIT ......................................................................................................................... 38

LED UNIT ....................................................................................................................................... 39

RELAY UNIT .................................................................................................................................. 39

ACCESSORIES PARTS................................................................................................................. 39

PACKING PARTS ........................................................................................................................... 39

CABINET PARTS LIST................................................................................................................... 40

CABINET AND MECHANICAL PARTS.......................................................................................... 41

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-10A2U

Service work should be perfomed onl y by qualified service technicians who are thor oughly familiar with all safety checks and the servicing guidelines which follow:

IMPORTANT SERVICE SAFETY PRECAUTION

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

A V

ONLY WITH SAME TYPE FUSE. F3701 (1.6A, 125V), F3702 (1.6A, 125V), F3751 (2.5A, 125V) FUSE.

BEFORE RETURNING THE RECEIVER (Fire & Shock Hazard)

Before returning the receiver to the user , perf orm 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. T o be sure that no shock hazard e xists, check f or leakage current in the following manner.

• Plug the AC cord directly into a 110~240 v olt AC outlet, and connect the DC power cable into the receiv er'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 earth ground.

• Use an AC voltmeter ha ving with 5000 ohm per volt, or higher, sensitivity or measure the A C 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 and etc.) and measure the AC voltage drop across the resistor. All checks must be repeated with the AC cord plug connection reversed. (If necessary, a nonpolarized adaptor plug must be used only for the purpose of completing these checks.) Any reading of 0.75V peak (this corresponds to 0.5 milliamp. peak AC.) or more is excessive and indicates a potential shock hazard which must be corrected before returning the monitor to the owner.

DVM

AC SCALE

50k ohms.

10W

0.15 µF

TEST PROBE

TO EXPOSED METAL PARTS

CONNECT TO KNOWN EARTH GROUND

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234

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 and 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”

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234

Replacement Parts Lists

and

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.

LC-10A2U

AVERTISSEMENT

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 FUSIBLE PAR UN FUSIBLE DE MEME TYPE F3701 (1,6A, 125V), F3702 (1,6A, 125V), F3751 (2,5A, 125V).

A V

VERIFICATIONS CONTRE L’INCEN-DIE ET LE CHOC ELECTRIQUE

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

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

• Brancher le cordon d’alimentation dans la prise CA de 110~240 V et le câble d’alimentation CC dans le jack du moniteur. (Ne pas utiliser un transformateur pour cet essai.)

• A l’aide de deux fils à pinces, brancher une résistance de 1,5kΩ 10 watts en paralléle avec un condensateur de 0,15µF en série avec toutes les pièces métalliques exposées du coffret et une terre connue comme une conduite électrique ou une prise de terre branchée à la terre.

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

• Toucher avec la sonde d’essai les piéces 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 mesure la chute de tension CA en-travers de la résistance. T outes les vérifications doiv ent être refaites aprés a voir 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.) Une valeur de 0,75 V RMS ou plus (correspond à 0,5 mA C.A.) est excessive et implique un danger de secousse électrique, qui devra être supprimé avant de retourner l'appareil à l'utilisateur.

VTVM

ECHELLE CA

1.5 KOHMS 10W

0,15 µF

SONDE D'ESSAI

VERS PIECES METALLIQUES EXPOSEES

CANNECTER A UNE MASSE DE TERRE CONNUE

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234

SAFETY NOTICE

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

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234

identifiées par la marque “ å” et hachurées dans

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.

la liste

LC-10A2U

ELECTRICAL SPECIFICATIONS

Power input .......................................................................................DC 12V (Receiver)

....................................................................................... AC 110-240V (AC Adaptor)

Power consumption ..........................................................24W (Connected to DC 12V)

LCD panel size ....................................................................................... 10.4" TFT LCD

Number of pixels...........................................................................921,600 pixels (VGA)

Video color systems.........................................................................PAL/NTSC/SECAM

Audio amplifier .......................................................... 1.0 W + 1.0 W (at 10% distortion)

Speakers

Size .................................................................................................. 3 × 4 cm (2 pcs)

Voice coil impedance .......................................................................................8 ohm

Antenna input impedance............................................................... 75 ohm unbalanced

Tuning ranges

VHF Channels .............................................................................................2 thru 13

UHF Channels ...........................................................................................14 thru 69

CATV Channels .........................................................................................1 thr u 125

.........................................................................................(EIA, Channel Plan U.S.A)

Weight........................................................................................ 2.0 kg w/o accessories

Accessories ...................R/C, Batteries, Wall mount parts, Antenna cable, AC adapter,

AC cord, Operation manual

Specifications are subject to change without prior notice.

OPERATION MANUAL

LC-10A2U

Main unit (front view)

Main unit (rear view)

Remote control

LC-10A2U

SUPPLIED ACCESSORIES

Operation Manual (x1) Wireless Remote Control (x1)

TiNS-6926CEZZ

LANGU9053CE01

Wall Mount Bracket Screws (x4)

RRMCG1559CESA

Antenna CableWall Mount Bracket (x1) AC Cord

QCNW-5730CEZZ

QACCD3093CEZZ

AC Adapter (x1) Size AAA Dry Battery (x2)

Fixed Screw for Set Stand (x1)

UADP-0211CEZZ

UBATU0026GEZZ

DISASSEMBLY OF THE SET

P2001

P3203

P3204

SC401

P701

1. Remove the five lock screws (1) off the cabinet B.

2. Push on the six hooks (2) of the cabinet B and open it slightly.

3. Disconnect all the connectors (3) from the terminal and operation PWBs. Detach the cabinet B.

4. Disconnect all the connectors (4) from the main PWB.

LC-10A2U

Cabinet B

P301

P2001

(Main PWB)

P752

P401 SC1201

P701

P2002

P751

SC1203

Cabinet A

LC-10A2U

5. Remove the four lock screws (5) off the main PWB.

6. Peel off the five pieces of tape (6) and detach the LC display unit.

7. Remove the two lock screws (7) off the remote control PWB.

8. Remove the four lock screws (8) off the terminal PWB.

9. Remove the two lock screws (9) off the operation PWB.

10.Remove the two lock screws (10) off the flexible shield, and detach he relay PWB.

Main PWB

LC display unit

Cabinet A

Terminal PWB

Operation PWB

Remote control reception PWB

LC display unit

(rear view)

Cabinet B

Flexible shield

Relay PWB

11.Remove the lock screw (11) off the LC display unit.

12.Undo the seven hooks (12) to release the unit frame.

13.Detach the fluorescent lamp (13).

LC display unit

(front view)

LC-10A2U

Panel holder

LC-10A2U

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-0211CEZZ DC power supply: 12 ± 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 microcomputer 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)Inspection mode

[Procedure] Holding down the [TV/VIDEO] key and [MENU] key, turn on the power.

[Description]

• In the ordinary menu select “VIDEO ADJUST” with the [CH] key, and decide with the [VOL] key. Then select “PICTURE”, “TINT (only NTSC)”, “COLOR”, “BLACK LEVEL”, “SHARPNESS”, “RED-BLUE”, “GREEN” and “COLOR SYSTEM” with the [CH] key, and decide with the [VOL] key. After that, adjust values with the [VOL] key.

• VOLUME, PICTURE, TINT (only NTSC), COLOR, BLACK LEVEL, SHARPNESS, RED-BLUE, GREEN change as follows.

ûMin.Û ûCenterÛ ûMax.Û

(4)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 adjustment mode.

[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.

4.Adjustments

Adjustment Adjusting conditions Adjusting method

1 +B Adjustment 1. Connect the DC voltmeter to 1. Adjust the "+B-Adj" value to

(If E2PROM is replaced) pin 49 of SC401. 5.0V±0.02V with [VOL+] or [VOL-] (IC2004) 2. Go to the adjustment mode. Key.

* The color of "+B Adj" must be yellow.

2 Model setup 1. Go to the adjustment mode. 1. Select "MODEL" with [MENU] key

(If E2PROM is replaced) and adjust to "A2U" with [VOL+] (IC2004) or [VOL-] key.

* The color of "MODEL" must be yellow.

3 Counter-bias adjustment 1. Receive a B/W channel. 1. Adjust "COM BIAS" to the darkest

2. Go to the adjustment mode. screen with [VOL+] and [VOL-] key.

3. Select the "COM BIAS" with * The color of "COM BIAS" must be [MENU] key. yellow.

LC-10A2U

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

SHARP................................................................................................................................................ 0

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

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

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

AV Color System ................................................................................................................................ Auto

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

AV1 ..................................................................................................................................................... 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

LC-10A2U

No picture

at all

Yes

Are inputs

and outputs

of IC802 as

specified?

Check all the settings on the microprocessor’s adjust process menu.

No picture

Check IC802

and its

peripheral

parts.

Yes

Are inputs

and outputs

of IC1201 as

specified?

Check

IC1201 and

its peripheral

parts.

Check LCD

panel voltage

and

waveform.

No TV and

VIDEO 1

output

Yes

Are inputs

and outputs

of IC402 as

specified?

Check IC402

and its

peripheral

parts.

Is input at Pin

(73) of IC802

as specified?

Check IC802,

AV1 line and

their

peripheral

parts.

No TV

output

Yes

Are voltages

at Pins (6),

(7) and (9) of

tuner as

specified?

Check the

power line.

Yes

Is output at

Pin (19) of

tuner as

specified?

Check the

tuner and its

peripheral

parts.

Is input at Pin

(1) of IC402

as specified?

Check the

line in

question.

Yes

Check IC402

and its

peripheral

parts.

Yes

Are Pins (2)

and (4) of

IC402 at “H”

and “L”

respectively?

Are Pins (65)

and (66) of

IC2001 at “H”

and “L”

respectively?

No VIDEO

1 output

Yes

Is input at Pin

(1) of IC402

as specified?

Check the

line in

question.

Yes

Are Pins (1)

and (4) of

IC402 both at

“L”?

No VIDEO

2 output

Is input at Pin

(74) of IC802

as specified?

Check J3404,

AV line and

their

peripheral

parts.

No S

VIDEO

output

Are inputs at

Pins (71) and

(72) of IC802

as specified?

Check J3301,

SY line, SC

line and

peripheral

parts.

Are Pins (65)

and (66) of

IC2001 both

at “L”?

Check IC402

and its

peripheral

parts.

Yes

Check the

line in

question.

Yes

Check the

line in

question.

TROUBLE SHOOTING TABLE

TROUBLE SHOOTING TABLE (Continued)

No picture and sound

No color

No TV color

No S-VIDEO color

Yes

Do F3701 and F3702

function?

Check all the settings on the microprocessor’s adjust process menu.

Are secondary outputs

(+38V, +16V, +9V, +5V, -8V)

of T701 as specified?

Yes

Are the oscillation waveform

at T701’s primary side as

specified?

Yes

Disconnect F3701 and

F3702. Is the load side

short-circuited?

Yes

Is any of T701’s primary side,

Q701, Q710 and S4701

short-circuited?

Check J3701, its peripheral

parts and connection cable.

Replace F3701 and F3702.

Check S4701 and

connection cable.

Check the secondary-side

load of T701.

Fluorescent lamp

Yes

Does F3751 function?

Yes

Is Pin (34) of IC1202 at “H”?

Yes

Are the oscillation waveforms

at the primary side of T751

and T752 as specified?

Yes

Replace F3751.

Is input at Pin (71) of IC802

as specified?

Check J3301, SC line and

peripheral parts.

Yes

Check the line, IC1202 and

its peripheral parts.

Check Q751, Q752, T751,

T752, Q753 and their

peripheral parts.

Replace the fluorescent lamp

and check the oscillation

waveform again.

No VIDEO color

Check all the settings on the microprocessor’s adjust process menu.

LC-10A2U

+ 28 hidden pages