Sharp LC-15SH1U, LC-15AV1U Schematic

SERVICE MANUAL

LC-15SH1U/LC-15AV1U

SERVICE MANUAL

S74X8LC15AV1U

LCD COLOR TV

LC-15SH1U

LCD COLOR TV

LC-15SH1U

LC-15AV1U

MODELS

SPECIFICATIONS ................................................................................................................................ 1-1

IMPORTANT SAFEGUARDS AND PRECAUTIONS............................................................................ 2-1

LC-15SH1U/LC-15AV1U

STANDARD NOTES FOR SERVICING................................................................................................ 3-1

CABINET DISASSEMBLY INSTRUCTIONS ........................................................................................ 4-1

ELECTRICAL ADJUSTMENT INSTRUCTIONS................................................................................... 5-1

TROUBLESHOOTING .......................................................................................................................... 6-1

BLOCK DIAGRAMS.............................................................................................................................. 7-1

SCHEMATIC DIAGRAMS/ CBA’S AND TEST POINTS ....................................................................... 8-1

WAVEFORMS & VOLTAGE CHART.................................................................................................... 9-1

WIRING DIAGRAM ............................................................................................................................. 10-1

IC PIN FUNCTION DESCRIPTIONS .................................................................................................. 11-1

EXPLODED VIEWS ............................................................................................................................ 12-1

MECHANICAL PARTS LIST ............................................................................................................... 13-1

ELECTRICAL PARTS LIST ................................................................................................................ 14-1

MODELS

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

CONTENTS

LC-15AV1U

Page

SHARP CORPORATION

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

<TUNER>

SPECIFICATIONS

ANT. Input ........................... 75ohm Unbal., F type

Reference Level..................20Vp-p (CRT Green Cathode)

Test Input Signal ................. 400Hz 30% modulation

Description Condition Unit Nominal Limit

1. Intermediate Freq.

2. Color Killer Sens.

3. AFT Pull In Range (

10mV input

)

Picture

Sound

CH-2 CH-10 CH-55

- MHz ±2.1 ±0.7

MHz MHz

dBµV dBµV dBµV

45.75

41.25 15

15 15

Description Condition Unit Nominal Limit

1. Number of Pixels

2. Brightness cd/m

3. Color Gamut - % 64 -

4. Response Time - msec 16 -

5. Support Color - - 16mil.(8bit

Horizontal

Vertical

pixels pixels

640 x 3

480

420 -

)

20 20 20

6. Vie wing Angle (

at contrast 1:10 min.

)

Horizontal

Vertical

° °

-85 to 85

The LCD panel is manufactured to provide many years of useful life. Occasionally a few non active pixels may appear as a tiny spec of color. This is not to be considered a defect in the LCD screen.

1-1

L0270SP

<VIDEO>

Description Condition Unit Nominal Limit

1. Over Scan

2. Color Temperature (80% WHITE

3. Color Temperature (40% WHITE

4. Resolution

Horizontal

Vertical

)

x y

Horizontal

Vertical

% %

°K

line line

5 5

8500+10MPCD

0.292

0.307 9000

0.286

0.299 400

350

±0.01 ±0.01

<AUDIO>

All items are measured across 8Ω load at speaker output terminal with L.P.F.

Description Condition Unit Nominal Limit

1. Audio Output Power 10% THD: Lch/Rch W 1.0/1.0 0.8/0.8

2. Audio Distortion 500mW: Lch/Rch % 1.0/1.0 4.0/4.0

3. Audio Freq. Response

Note:

Nominal specifications represent the design specifications. All units should be able to approximate these. Some will exceed and some may drop slightly below these specifications. Limit specifications represent the absolute worst condition that still might be considered acceptable. In no case should a unit fail to meet limit specifications.

-3dB: Lch

-3dB: Rch

Hz Hz

50 to 12K 50 to 12K

1-2

L0270SP

IMPORTANT SAFEGUARDS AND PRECAUTIONS

Prior to shipment from the factory, our products are strictly inspected for recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.

Safety Precautions for TV Circuit

1. Before returning an instrument to the customer,

always make a safety check of the entire instrument, including, but not limited to, the following items:

a. Be sure that no built-in protective devices are

defective and have been defeated during servicing. (1) Protective shields are provided on this chassis to protect both the technician and the customer. Correctly replace all missing protective shields, including any removed for servicing convenience. (2) When reinstalling the chassis and/or other assembly in the cabinet, be sure to put back in place all protective devices, including but not limited to, nonmetallic control knobs, insulating fishpapers, adjustment and compartment covers/shields, and isolation resistor/capacitor networks. Do not operate

this instrument or permit it to be operated without all protective devices correctly installed and functioning. Servicers who defeat safety features or fail to perform safety checks may be liable for any resulting damage.

b. Be sure that there are no cabinet openings through

which an adult or child might be able to insert their fingers and contact a hazardous voltage. Such openings include, but are not limited to, (1) spacing between the picture tube and the cabinet mask, (2) excessively wide cabinet ventilation slots, and (3) an improperly fitted and/or incorrectly secured cabinet back cover.

c. Antenna Cold Check - With the instrument AC plug

removed from any AC source, connect an electrical jumper across the two AC plug prongs. Place the instrument AC switch in the on position. Connect one lead of an ohmmeter to the AC plug prongs tied together and touch the other ohmmeter lead in turn to each tuner antenna input exposed terminal screw and, if applicable, to the coaxial connector. If the measured resistance is less than 1.0 megohm or greater than 5.2 megohm, an abnormality exists that must be corrected before the instrument is returned to the customer. Repeat this test with the instrument AC switch in the off position.

d. Leakage Current Hot Check - With the instrument

completely reassembled, plug the AC line cord directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI) C101.1 Leakage Current for Appliances and Underwriters Laboratories (UL) 1410, (50.7). With the instrument AC switch first in the on position and

then in the off position, measure from a known earth ground (metal water pipe, conduit, etc.) to all exposed metal parts of the instrument (antennas, handle brackets, metal cabinet, screw heads, metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5 milli-ampere. Reverse the instrument power cord plug in the outlet and repeat the test.

READING SHOULD NOT BE ABOVE 0.5 mA

LEAKAGE

DEVICE

BEING

TESTED

TEST ALL EXPOSED

METAL SURFACES

ALSO TEST WITH PLUG REVERSED USING AC ADAPTER PLUG AS REQUIRED

ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE INSTRUMENT TO THE CUSTOMER OR BEFORE CONNECTING THE ANTENNA OR ACCESSORIES.

e. X-Radiation and High Voltage Limits - Because

the picture tube is the primary potential source of Xradiation in solid-state TV receivers, it is specially constructed to prohibit X-radiation emissions. For continued X-radiation protection, the replacement picture tube must be the same type as the original. Also, because the picture tube shields and mounting hardware perform an X-radiation protection function, they must be correctly in place. High voltage must be measured each time servicing is performed that involves B+, horizontal deflection or high voltage. Correct operation of the X-radiation protection circuits also must be reconfirmed each time they are serviced. (X-radiation protection circuits also may be called "horizontal disable" or "hold down.") Read and apply the high voltage limits and, if the chassis is so equipped, the X-radiation protection circuit

CURRENT

TESTER

EARTH GROUND

2-1

LCVISP

specifications given on instrument labels and in the Product Safety & X-Radiation Warning note on the service data chassis schematic. High voltage is maintained within specified limits by close tolerance safety-related components/adjustments in the highvoltage circuit. If high voltage exceeds specified limits, check each component specified on the chassis schematic and take corrective action.

2. Read and comply with all caution and safety-related notes on or inside the receiver cabinet, on the receiver chassis, or on the picture tube.

3. Design Alteration Warning - Do not alter or add to the mechanical or electrical design of this TV receiver. Design alterations and additions, including, but not limited to circuit modifications and the addition of items such as auxiliary audio and/or video output connections, might alter the safety characteristics of this receiver and create a hazard to the user. Any design alterations or additions will void the manufacturer's warranty and may make you, the servicer, responsible for personal injury or property damage resulting therefrom.

4. Picture Tube Implosion Protection Warning - The picture tube in this receiver employs integral implosion protection. For continued implosion protection, replace the picture tube only with one of the same type number. Do not remove, install, or otherwise handle the picture tube in any manner without first putting on shatterproof goggles equipped with side shields. People not so equipped must be kept safely away while picture tubes are handled. Keep the picture tube away from your body. Do not handle the picture tube by its neck. Some "in-line" picture tubes are equipped with a permanently attached deflection yoke; because of potential hazard, do not try to remove such "permanently attached" yokes from the picture tube.

5. Hot Chassis Warning -

a. Some TV receiver chassis are electrically connected

directly to one conductor of the AC power cord and maybe safety-serviced without an isolation transformer only if the AC power plug is inserted so that the chassis is connected to the ground side of the AC power source. To confirm that the AC power plug is inserted correctly, with an AC voltmeter, measure between the chassis and a known earth ground. If a voltage reading in excess of 1.0V is obtained, remove and reinsert the AC power plug in the opposite polarity and again measure the voltage potential between the chassis and a known earth ground.

b. Some TV receiver chassis normally have 85V

AC(RMS) between chassis and earth ground regardless of the AC plug polarity. This chassis can

be safety-serviced only with an isolation transformer inserted in the power line between the receiver and the AC power source, for both personnel and test equipment protection.

c. Some TV receiver chassis have a secondary ground

system in addition to the main chassis ground. This secondary ground system is not isolated from the AC power line. The two ground systems are electrically separated by insulation material that must not be defeated or altered.

6. Observe original lead dress. Take extra care to assure correct lead dress in the following areas:a. near sharp edges,b. near thermally hot parts-be sure that leads and components do not touch thermally hot parts,c. the AC supply,d. high voltage, and,e. antenna wiring. Always inspect in all areas for pinched, out of place, or frayed wiring. Check AC power cord for damage.

7. Components, parts, and/or wiring that appear to have overheated or are otherwise damaged should be replaced with components, parts, or wiring that meet original specifications. Additionally, determine the cause of overheating and/or damage and, if necessary, take corrective action to remove any potential safety hazard.

8. Product Safety Notice - Some electrical and mechanical parts have special safety-related characteristics which are often not evident from visual inspection, nor can the protection they give necessarily be obtained by replacing them with components rated for higher voltage, wattage, etc.. Parts that have special safety characteristics are identified by a ( # ) on schematics and in parts lists. Use of a substitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock, fire, and/or other hazards. The product's safety is under review continuously and new instructions are issued whenever appropriate. Prior to shipment from the factory, our products are strictly inspected to confirm they comply with the recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.

2-2

LCVISP

IMPORTANT SERVICE SAFETY PRECAUTION

T M

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 F

TEST PROBE

O EXPOSED

ETAL PARTS

CONNECT TO KNOWN EART GROUND

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 components having such features are identified by “#”

and shaded areas in the Replacement Parts Lists and 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.

2-3

LCVISP

PRECAUTIONS A PRENDRE LORS DE LA REPARATION

A M E

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

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

A V

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

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 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

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 pièces métalliques

•

exposées qui présentent une voie de retour au châssis (antenne, coffret métallique, tête des vis, arbres de commande et des boutons, écusson, etc.) et mesurer la chute de tension CA en-travers de la résistance. Toutes les vérifications doivent être refaites après avoir inversé la fiche du cordon d’alimentation. (Si nécessaire, une prise d’adpatation non polarisée peut être utilisée dans le but de terminer ces vérifications.) Tous les courants mesurés ne doivent pas dépasser 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.

DVM

ECHELLE CA

1.5k ohm 10W

0.15 F

SONDE D'ESSAI

UX PIECES

ETALLIQUES

XPOSEES

BRANCHER A UN 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 identifiées par la marque "#" et hachurées dans la liste des pièces de remplacement et les diagrammes schématiques. Pour assurer la protection, ces pièces doivent être identiques à 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.

2-4

LCVISP

STANDARD NOTES FOR SERVICING

NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.

Circuit Board Indications

a. The output pin of the 3 pin Regulator ICs is indicated

as shown.

Top View

Out

b. For other ICs, pin 1 and every fifth pin are indicated

as shown.

< Bottom View >

Input

Bottom View

Pin 1

c. The 1st pin of every male connector is indicated as

shown.

< Bottom View >

Pin 1

Instructions for Connectors

1. When you connect or disconnect the FFC (Flexible Foil Connector) cable, be sure to first disconnect the AC cord.

2. FFC (Flexible Foil Connector) cable should be inserted parallel into the connector, not at an angle.

Precautions for Using Lead-free Solder

1 Employing lead-free solder

Pb free mark (as shown below) indicates lead-free solder, and is attached on the PWBs and service manuals. For PWBs with Pb free mark, be sure to use lead-free solder. For PWB without Pb free mark, use standard solder. The alphabetical character following Pb shows the type of lead-free solder.

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.

FFC Cable

Connector

CBA

* Be careful to avoid a short circuit.

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

Lead-free wire solder for servicing

Part No. Description Code ZHNDAi123250E J 0.3mm 250g(1roll) BL ZHNDAi126500E J 0.6mm 500g(1roll) BK ZHNDAi12801KE J 1.0mm 1kg(1roll) BM

3-1

LCV_NOTE

How to Remove / Install Flat Pack-IC

Flat Pack-IC

Desoldering Braid

Soldering Iron

Fig. S-1-3

Fine Tip Soldering Iron

Sharp Pin

Fig. S-1-4

With Soldering Iron:

1. Removal

With Hot-Air Flat Pack-IC Desoldering Machine:

(1) Prepare the hot-air flat pack-IC desoldering ma-

(2)Remove the flat pack-IC with tweezers while apply-

(3)Bottom of the flat pack-IC is fixed with glue to the

(4)Release the flat pack-IC from the CBA using twee-

Caution:

1. Do not supply hot air to the chip parts around the flat

2. The flat pack-IC on the CBA is affixed with glue, so

chine, then apply hot air to the Flat Pack-IC (about 5 to 6 seconds). (Fig. S-1-1)

Fig. S-1-1

ing the hot air.

CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6)

zers. (Fig. S-1-6)

pack-IC for over 6 seconds because damage to the chip parts may occur. Put masking tape around the flat pack-IC to protect other parts from damage. (Fig. S-1-2)

be careful not to break or damage the foil of each pin or the solder lands under the IC when removing it.

Hot-air Flat Pack-IC Desoldering

CBA

Masking Tape

Tweezers

Machine

Flat Pack-IC

Fig. S-1-2

(1)Using desoldering braid, remove the solder from all

pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3)

(2)Lift each lead of the flat pack-IC upward one by one,

using a sharp pin or wire to which solder will not adhere (iron wire). When heating the pins, use a fine tip soldering iron or a hot air desoldering machine. (Fig. S-1-4)

(3)Bottom of the flat pack-IC is fixed with glue to the

CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6)

(4)Release the flat pack-IC from the CBA using twee-

zers. (Fig. S-1-6)

With Iron Wire:

(1)Using desoldering braid, remove the solder from all

pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3)

(2) Affix the wire to a workbench or solid mounting point,

as shown in Fig. S-1-5.

(3)While heating the pins using a fine tip soldering iron

or hot air blower, pull up the wire as the solder melts so as to lift the IC leads from the CBA contact pads as shown in Fig. S-1-5.

3-2

LCV_NOTE

(4)Bottom of the flat pack-IC is fixed with glue to the

Example :

Pin 1 of the Flat Pack-IC is indicated by a " " mark.

Fig. S-1-7

Presolder

CBA

Flat Pack-IC

Fig. S-1-8

CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6)

(5)Release the flat pack-IC from the CBA using twee-

zers. (Fig. S-1-6)

Note:

When using a soldering iron, care must be taken to ensure that the flat pack-IC is not being held by glue. When the flat pack-IC is removed from the CBA, handle it gently because it may be damaged if force is applied.

Hot Air Blower

Iron Wire

2. Installation

(1)Using desoldering braid, remove the solder from the

foil of each pin of the flat pack-IC on the CBA so you can install a replacement flat pack-IC more easily.

(2) The “

(3)Solder all pins of the flat pack-IC. Be sure that none

” mark on the flat pack-IC indicates pin 1. (See Fig. S-1-7.) Be sure this mark matches the 1 on the PCB when positioning for installation. Then presolder the four corners of the flat pack-IC. (See Fig. S1-8.)

of the pins have solder bridges.

To Solid Mounting Point

CBA

Tweezers

Soldering Iron

Fig. S-1-5

Fine Tip Soldeing Iron

Flat Pack-IC

Fig. S-1-6

3-3

LCV_NOTE

Instructions for Handling Semi-conductors

Electrostatic breakdown of the semi-conductors may occur due to a potential difference caused by electrostatic charge during unpacking or repair work.

1. Ground for Human Body

Be sure to wear a grounding band (1MΩ) that is properly grounded to remove any static electricity that may be charged on the body.

2. Ground for Workbench

Be sure to place a conductive sheet or copper plate with proper grounding (1MΩ) on the workbench or other surface, where the semi-conductors are to be placed. Because the static electricity charge on clothing will not escape through the body grounding band, be careful to avoid contacting semi-conductors with your clothing.

< Incorrect >

< Correct >

CBA

Grounding Band

CBA

Conductive Sheet or Copper Plate

3-4

LCV_NOTE

CABINET DISASSEMBLY INSTRUCTIONS

NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.

[ LC-15SH1U ]

1. Disassembly Flowchart

This flowchart indicates the disassembly steps to gain access to item(s) to be serviced. When reassembling, follow the steps in reverse order. Bend, route, and dress the cables as they were originally.

[1] Rear Cabinet

[2] Main CBA

[6] Speaker L

[3] LCD Main CBA

[4] Liquid Crystal Panel

[5] Function CBA

[7] Speaker R

2. Disassembly Method

REMOVAL

ID/

LOC.

No.

[1]

[2] Main CBA

[3]

[4]

[5]

[6] Speaker L

PART

Rear Cabinet

LCD Main D3D2 CBA

Liquid Crystal Panel

Function D3D2 CBA

REMOVE/*UNHOOK/

Fig.

UNLOCK/RELEASE/

No.

UNPLUG/DESOLDER

D1 6(S-1

D2 D3

), (

), 2(

6(S-4 *CN101A, *CN102A *CN103A, *CN801 *CN802, *CN401 *CN402, *CN403 *CN404, *CN104

4(S-6 *CN311A, *CN321A

4(S-7

3(S-8

2(S-9

*CN310A

)

S-2

S-5

), (

S-3

Not

)

, , ,

[8] Front Cabinet

[7] Speaker R

Front

[8]

Cabinet

↑↑↑ ↑ ↑

123 4 5

1 : Identification (location) No. of parts in the figures 2 : Name of the part 3 : Figure Number for reference 4 : Identification of parts to be removed, unhooked,

unlocked, released, unplugged, unclamped, or desoldered. P=Spring, L=Locking Tab, S=Screw, CN=Connector, *=Unhook, Unlock, Release, Unplug, or Desolder e.g.5(S-1) = five Screws (S-1),

2(L-2) = two Locking Tabs (L-2)

5 : Refer to "Reference Notes."

D2 D3

D2 ---------- -

2(S-10

)

4-1

L0270DC

S-1

[1] Rear Cabinet

S-1

S-2

S-3

S-1

Fig. D1

4-2

L0270DC

[8] Front Cabinet

[6] Speaker L

[7] Speaker R

S-8

[5] Function CBA

S-10

[4] Liquid Crystal Panel

S-9

S-7

S-9

S-7

S-6

S-4

[3] LCD Main CBA

[2] Main CBA

S-6

S-5

S-4

Fig. D2

4-3

L0270DC

To Liquid Cristal Panel

CLN104

CN321A

LCD Main CBA

CN310A CN311A

CN113B CN112B

CN103A

CN102A CN101A

Function CBA

CN111B

CN104

CN401

CN402

To Liquid Cristal Panel

CN403

Main CBA

CN801

To Speaker

CN404

CN802

To Speaker

Fig. D3

4-4

L0270DC

[ LC-15AV1U ]

1. Disassembly Flowchart

[1] Rear Cabinet

[2] Main CBA

[7] Speaker L

[3] LCD Main CBA

[4] Liquid Crystal Panel

[5] Function CBA

[6] IR Sensor CBA

[9] Front Cabinet

[8] Speaker R

ID/

LOC.

PART

No.

Rear

[1]

Cabinet

[2] Main CBA

LCD Main D6D5

[3]

CBA Liquid

[4]

Crystal Panel

Function D6D5

[5]

CBA IR Sensor D6D5

[6]

CBA

[7] Speaker L

REMOVAL

REMOVE/*UNHOOK/

Fig.

UNLOCK/RELEASE/

No.

UNPLUG/DESOLDER

6(S-4

), (

), 2(

S-2

S-5

D4 9(S-1

*CN101A, *CN102A *CN103A, *CN801

*CN802, *CN401

*CN402, *CN403 *CN404, *CN104, *CN105

4(S-6

*CN310A

*CN311A, *CN321A

D5 D6

4(S-7

3(S-8

2(S-9

2(S-10

)

), (

S-3

Not

)

[8] Speaker R

Front

[9]

Cabinet

D5 D6

D5 ---------- -

2(S-11

)

↑↑↑ ↑ ↑

123 4 5

1 : Identification (location) No. of parts in the figures 2 : Name of the part 3 : Figure Number for reference 4 : Identification of parts to be removed, unhooked,

unlocked, released, unplugged, unclamped, or desoldered. P=Spring, L=Locking Tab, S=Screw, CN=Connector, *=Unhook, Unlock, Release, Unplug, or Desolder e.g.5(S-1) = five Screws (S-1),

2(L-2) = two Locking Tabs (L-2)

5 : Refer to "Reference Notes."

4-5

L0270DC

[1] Rear Cabinet

S-1

S-3

S-1

S-2

S-1

Fig. D4

4-6

L0270DC

[9] Front Cabinet

[7] Speaker L

S-10

[5] Function CBA

[3] LCD Main CBA

S-7

S-9

[6] IR Sensor CBA

S-8

S-11

[8] Speaker R

[4] Liquid Crystal Panel

S-7

S-4

S-6

[2] Main CBA

S-6

S-5

S-4

Fig. D5

4-7

L0270DC

To Liquid Cristal Panel

CLN104A

CN321A

LCD Main CBA

CN310A CN311A

CN113B CN112B

CN103A

CN102A CN101A

Function CBA

CN111B

CN104A

CN401

CN402

To Liquid Cristal Panel

CN403

Main CBA

CN801 CN105

To Speaker

CLN105

IR Sensor CBA

CN404

CN802

To Speaker

Fig. D6

4-8

L0270DC

ELECTRICAL ADJUSTMENT INSTRUCTIONS

NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.

NOTE:

Electrical adjustments are required after replacing circuit components and certain mechanical parts. It is important to perform these adjustments only after all repairs and replacements have been completed.

Also, do not attempt these adjustments unless the proper equipment is available.

Test Equipment Required

1. NTSC Pattern Generator (Color Bar W/White Window, Red Color, Dot Pattern, Gray Scale, Monoscope, Multi-Burst)

2. Remote control unit (attached remote control unit)

100

123

LCDTV

3. Color Analyzer

4. DC Voltmeter

How to set up the service mode:

Service mode:

1. Turn the power on. (Use main power on the TV unit.)

2. In standby mode, simultaneously press “POWER” button and “MENU” button on the TV unit. Version of micro computer will display on the LCD or display. (Ex: 0001AGP-0.11, 0002AGP-0.14 or 0003AGP-

0.17)

1. Initial Setting

General

Enter the Service mode.

Set the each initial data as shown on table 1 below.

Table 1: Initial Data

BUTTON

(

ITEM

on the service

remote control

)

BRT CNT 185 CLR-R 72 CLR-B 72

1 TNT 56 V-TNT 65 SHR 28 S-BRT S-CNT 185 S-CLR-R 72 S-CLR-B 72

2 S-TNT 65

S-SHR 28 C-BRT C-CNT 185 C-CLR-R 67 C-CLR-B 73

3 C-TNT 72

C-SHR 28 SAIDO C-SAIDO 143 NORMAL DARK 150 COR(C/D1 COG(C/D1 COB(C/D1 DR(C/D1 DG(C/D1 DB(C/D1 C-COR(C/D2 C-COG(C/D2 C-COB(C/D2 C-DR(C/D2

) )

) ) )

)

) ) )

)

Vol down 1 512 Vol down 2 512 Vol down 3 512 Vol down 4 130 Vol down 5 132 Vol down 6 117 Vol down 1 512 Vol down 2 512 Vol down 3 512 Vol down 4 130

DATA

VALUE

126

148

5-1

L0270EA

BUTTON

(

ITEM

C-DG(C/D2 C-DB(C/D2 7F LANGUAGE SPA/FRA STEREOTYP MTS ACCESSCODE BLACKLIGHT ON HD OFF HRD OFF NCM OFF ASPECT OFF

)

on the service

remote control

Vol down 5 132 Vol down 6 117

Vol down

)

DATA

VALUE

3. Flicker Adjustment

Note: Use remote control unit

1. Enter the Service mode. (See page 5-1)

2. Press “2” button on the remote control unit. The following screen appears.

2. +B Adjustment

Purpose: To obtain correct operation. Symptom of Misadjustment: The picture is dark and

the unit does not operate correctly.

Test point Adj. Point Mode Input

TP401(B+)

TP300(GND)

M. EQ.

DC Voltmeter

Note: TP401, TP300(GND), VR601 --- Main CBA

1. Connect DC Volt Meter to TP401 and TP300(GND).

2. Adjust VR601 so that the voltage of TP401 becomes +13.0±0.5V DC.

VR601

--- ---

Spec.

+13.0±0.5V DC.

3. If Flicker Adjustment is not fit, the screen become the following.

FLASH (Go and Off)

4. Press “CH o/p” buttons on the remote control unit until flash stops.

4. TV Reset to Default

To reset software, press “5” button on the remote control unit for at least 5 seconds after pressing “FLASHBACK” button on the remote control unit.

5-2

L0270EA

The following adjustment normally are not attempted

Test point Adj. Point Mode Input

Screen

M. EQ.

Spec.

Pattern Generator,

Color analyzer

x (0.282 to 0.302) y (0.297 to 0.317)

Figure

VIDEO 1 VIDEO 2

White Purity

(APL 80%

and 40%)

APL 80%

x (0.276 to 0.296) y (0.289 to 0.309)

APL 40%

Color Analyzer

It carries out in a darkroom.

L = 50 cm

Perpendicularity

INPUT: WHITE 80%

Fig. 2

CH buttons

in the field. Only when replacing the LCD Panel then adjust as a preparation.

5. White Balance Adjustment

Purpose: To mix red, green and blue beams correctly

for pure white. Symptom of Misadjustment: White becomes bluish

or reddish.

Method 1

Vary the “RCUTOFF”, “BCUTOFF”, “RGAIN” and “BGAIN” settings of the adjustment process below.

Adjustment Process

Method 2

RCUTOFF GCUTOFF BCUTOFF R-GAIN G-GAIN B-GAIN

1. Receive the black signal (white 40%). Adjust the “RCUTOFF” and “BCUTOFF” settings to

have the black color temperature as specified.

2. Receive the white 80% signal. Adjust two of the “R-GAIN”, “G-GAIN” and “B-GAIN”

settings in the decreasing direction to be visible white.

Note: Make sure at least one of the “R-GAIN”, “GGAIN” and “B-GAIN” settings is “0”.

3. Check to see if the black and white color temperatures are as specified. If not, repeat the above steps 1 and 2.

Red cut - off adjustment

Green cut - off adjustment

Blue cut - off adjustment

White balance

Note: Use remote control unit

1. Operate the unit for more than 20 minutes.

2. Input the White Purity (APL 80%).

3. Set the color analyzer to the CHROMA mode and bring the optical receptor to the center on the LCDPanel surface after zero point calibration as shown above.

Note: The optical receptor must be set perpendicularly to the LCD Panel surface.

4. Enter the Service mode. Press “VOL p” button on the remote control unit and select “C/D” mode.

5. When “x” value and “y” value are not within specification, adjust “DB” or “DR”. Refer to “1. Initial Setting.”

6. Input the White Purity (APL 40%).

7. Press “VOL p” button on the remote control unit and select “C/D” mode.

8. When “x” value and “y” value are not within specification, adjust “COB” or “COR”. Refer to “1. Initial Setting.”

9. Also VIDEO 2 mode.

5-3

L0270EA

6. Sub-Brightness Adjustment

Purpose: To mix red, green and blue beams correctly

for pure white. Symptom of Misadjustment: White becomes bluish

or reddish.

Confirmation at [VIDEO-1]

1. Set CG951 to 7/5/3 IRE 3-step grayscale. 7 IRE 5 IRE 3 IRE

TEST PATTERN (7/5/3 IRE)

2. Apply CG951 video signal to VIDEO1 input.

3. Enter the Service mode.

4. Make sure that contrast and brightness controls are

set to initial position.

5. Confirm “5 IRE” position was biginning to bright.

6. If “5 IRE” position was bigining to bright, no need to

adjust.

7. If “5 IRE” position is not avilable or to be highly

brightness, then adjust the following values by using remote control unit. Refer to “1. Initial Setting.”

RF/VIDEO1: BRT VIDEO2: C-BRT

Confirmation at [VIDEO-2]

1. Set CG951 to 7/5/3 IRE 3-step grayscale.

2. Apply CG951 video signal to “Y” input.

3. Enter the Service mode.

4. Make sure that contrast and brightness controls are

set to initial position.

5. Confirm “5 IRE” position was beginning to bright.

6. If “5 IRE” position was beginning to bright, no need

to adjust.

7. If “5 IRE” position is not available or to be highly

brightness, then adjust the following values by using remote control unit. Refer to “1. Initial Setting.”

RF/VIDEO1: BRT VIDEO2: C-BRT

5-4

L0270EA

TROUBLESHOOTING

Table of Contents for the Troubleshooting Flow Charts

Flow

Chart

No.

1 The power cannot be turned on. 6-2 2 The fuse blows out. 6-2 3 When the output voltage fluctuates. 6-2 4 When buzz sound can be heard in the vicinity of power circuit. 6-2 5 AL-8V is not outputted. 6-2 6 AL+3.3V is not outputted. 6-3 7 AL+40V is not outputted. 6-3 8 AL+5V is not outputted. 6-3

9 AL+33V is not outputted. 6-3 10 AL+12V is not outputted. 6-3 11 REG+5V(1) is not outputted. 6-4 12 REG+5V(2) is not outputted. 6-4 13 P-ON+3.3V(D) is not outputted. 6-4 14 P-ON+3.3V(A) is not outputted. 6-4 15 P-ON+1.8V(D) is not outputted. 6-4 16 PANEL+24V is not outputted. 6-5 17 PANEL+5.4V is not outputted. 6-5 18 PANEL-12V is not outputted. 6-5 19 PANEL+12V is not outputted. 6-5 20 PANEL+9V is not outputted. 6-5 21 The key operation is not functioning. 6-6 22 No operation is possible from the remote control unit. 6-6

Picture does not appear normally. (Tuner input / Video input/S-Video input.

23 24 Picture does not appear normally. (Y / Pb / Pr input. 25 Audio is not outputted normally. (Tuner input. 26 Audio is not outputted normally. (Audio input terminals.

Description Page

)

6-7 6-7 6-8 6-8

NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.

6-1

L0370TS

1. POWER SUPPLY SECTION

FLOW CHART NO.1

The power cannot be turned on.

Is the fuse (F601) normal?

Yes

Is normal state restored when once unplugged power cord is plugged again several seconds?

Yes

Is the AL +3.3V line voltage normal?

Yes

Check each rectifying circuit of the secondary circuit and service it if defective.

FLOW CHART NO.2

The fuse blows out.

Check the presence that the primary component is leaking or shorted and service it if defective.

After servicing, replace the fuse.

FLOW CHART NO.3

When the output voltage fluctuates.

See FLOW CHART No.2 <The fuse blows out.>

Check if there is any leak or short-circuiting on the primary circuit component, and service it if defective. (Q601,Q603.T601,D605,D606,D607,D608,C605, C606,C610,C654)

Check the presence that the rectifying diode or circuit is shorted in each rectifying circuit of secondary side, and service it if defective.

Does the photocoupler circuit on the secondary side operate normally?

Yes

Check IC601,D612,D613,D615 and their periphery, and service it if defective.

FLOW CHART NO.4

When buzz sound can be heard in the vicinity of power circuit.

Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary side, and service it if defective. (IC603,IC604,D630,D631,D632,D633,D635,D645)

LOW CHART NO.5

AL-8V is not outputted.

Is approximately -8V voltage supplied to the anode of D631?

Check if their is any leak or short-circuit on the loaded circuit, and service it if defective.

Yes

Check IC601,D646,D649 and their periphery, and service it if defective.

Check D631 and the periphery circuit, and service it if defective.

6-2

L0370TS

FLOW CHART NO.6

AL+3.3V is not outputted.

Is 3.3V voltage supplied to the cathode of D514?

Yes

Check if there is any leak or short-circuit on the loaded circuit and service it if defective.

FLOW CHART NO.7

AL+40V is not outputted.

Is approximately 40V voltage supplied to the emitter of Q516?

Yes

Is the voltage of base on Q516 lower than the voltage of emitter on Q516 when turning the power on?

Yes

Replace Q516.

LOW CHART NO.8

AL+5V is not outputted.

Is 5V voltage supplied to the cathode of D633?

Yes

Check if there is any leak or short-circuit on the loaded circuit and service it if defective.

Check D635,C637 and their periphery circuit, and service it if defective.

Check D645,D646,C644 and their periphery circuit, and service it if defective.

Check Q517 and P-ON-H line, and service it if defective.

Check D633,C635 and their periphery circuit, and service it if defective.

FLOW CHART NO.9

AL+33V is not outputted.

Is approximately 40V voltage supplied to the emitter of Q516?

Yes

Check D641,C648,C649,R658 and their periphery circuit, and service it if defective.

FLOW CHART NO.10

AL+12V is not outputted.

Is approximately 12V voltage supplied to the cathode of D630?

Yes

Is 12V voltage supplied to the emitter of Q427?

Yes

Is the voltage of base on Q427 lower than the voltage of emitter on Q427 when turning the power on?

Yes

Replace Q427.

See FLOW CHART No.7

Check D630,D632 and their periphery circuit, and service it if defective.

Check C634,C636,L630 and their periphery circuit, and service it if defective.

Check Q401 and BACKLIGHT-SW line, and service it if defective.

6-3

L0370TS

+ 60 hidden pages