SHARP LC-37SH20U Service Manual

LC-37SH20U

S36S1LC37SH20

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.

LC-37SH20U

OUTLINE

This model is based on the LC-37D40U and partially modified. For the contents not covered in this Service Manual, accordingly, please refer to the LC-37D40U Service Manual.

CONTENTS

» IMPORTANT SERVICE SAFETY PRECAUTION .........................................................................................3

» SPECIFICATIONS ........................................................................................................................................ 6

» OPERATION MANUAL .................................................................................................................................7

» DIMENSIONS ............................................................................................................................................. 11

» REMOVING OF MAJOR PARTS ................................................................................................................12

» DESCRIPTION OF SCHEMATIC DIAGRAM .............................................................................................. 17

» SCHEMATIC DIAGRAM ............................................................................................................................. 18

» REPLACEMENT PARTS LIST ....................................................................................................................24

» PACKING OF THE SET ..............................................................................................................................27

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

LC-37SH20U

LIST OF CHANGED PARTS

Ref. No. Description LC-37D40U LC-37SH20U Note

PRINTED WIRING BOARD ASSEMBLIES

MAIN Unit DUNTKD640FM06 DUNTKD640FM08 Some parts change R/C,LED Unit DUNTKD641FM06 DUNTKD641FM08 Some parts change IF Unit DUNTKD643FM06 DUNTKD643FM08 Some parts change KEY Unit DUNTKD716FM06 DUNTKD716FM08 No parts change POWER Unit RDENCA161WJQZ RDENCA161WJQZ

MAIN Unit

C1513 Capacitor RC-KZA510WJPZY — Delete C1515 Capacitor VCKYCZ1CB103KY — Delete C1517 Capacitor RC-KZA510WJPZY — Delete C1519 Capacitor VCKYCZ1EF104ZY — Delete D1503 Diode VHDDAN202K/-1Y — Delete D1505 Diode VHD1SS355//-1Y — Delete D1509 Diode VHD1SS226//-1Y — Delete D1513 Diode VHD1SS226//-1Y — Delete D1514 Diode VHD1SS355//-1Y — Delete FB1510 Ferrite Bead RBLN-0210TAZZY — Delete IC1501 IC VHi24LC2BiN-1Y — Delete L1506 Coil RCiLFA116WJZZY — Delete L1507 Coil RCiLFA116WJZZY — Delete L1508 Coil RCiLFA116WJZZY — Delete L1509 Coil RCiLFA116WJZZY — Delete Q1503 Transistor VSUM6K1NTN+-1Y — Delete Q1506 Transistor VSKRC404E++-1Y — Delete Q1508 Transistor VSKRC404E++-1Y — Delete Q1514 Transistor VSiMD2A////-1Y — Delete R1501 Resistor VRS-CZ1JF102JY — Delete R1532 Resistor VRS-CZ1JF473FY — Delete R1535 Resistor VRS-CZ1JF473FY — Delete R1536 Resistor VRS-CZ1JF100JY — Delete R1539 Resistor VRS-CZ1JF473FY — Delete R1540 Resistor VRS-CZ1JF100JY — Delete R1545 Resistor VRS-CY1JF474JY — Delete R1546 Resistor VRS-CY1JF474JY — Delete R1555 Resistor VRS-CZ1JF103JY — Delete R1559 Resistor VRS-CZ1JF103JY — Delete R1633 Resistor — VRS-CZ1JF103JY Add R8124 Resistor — VRS-CZ1JF103JY Add R8188 Resistor VRS-CZ1JF103JY — Delete SC1501 Socket QSOCZA072WJZZQ — Delete

R/C,LED Unit

C103 Capacitor VCKYCY1HF103ZY — Delete C104 Capacitor VCEASX1CN106MY — Delete IC101 IC VHiTPS850++-1Y — Delete

IF Unit

C511 Capacitor RC-KZA237WJZZY — Delete C513 Capacitor RC-KZA237WJZZY — Delete C517 Capacitor RC-KZA237WJZZY — Delete C533 Capacitor — VCKYCY1EF104ZY Add C534 Capacitor — VCKYCY1EF104ZY Add C535 Capacitor — VCKYCY1EF104ZY Add D515 Diode VHDDAN217U+-1Y — Delete D516 Diode VHDDAN217U+-1Y — Delete D517 Diode VHDDAN217U+-1Y — Delete FB511 Ferrite Bead RBLN-A204WJZZY — Delete FB514 Ferrite Bead RBLN-A204WJZZY — Delete FB517 Ferrite Bead RBLN-A204WJZZY — Delete J502 Jack QTANJA093WJZZ QTANJA101WJZZ R519 Resistor VRS-TQ2BD750JY — Delete R520 Resistor VRS-CY1JF102JY — Delete R525 Resistor VRS-TQ2BD750JY — Delete R530 Resistor VRS-TQ2BD750JY — Delete R554 Resistor VRS-CY1JF220JY — Delete R555 Resistor VRS-CY1JF220JY — Delete R556 Resistor VRS-CY1JF220JY — Delete R558 Resistor VRS-CY1JF101JY — Delete R602 Resistor — VRS-CY1JF000JY Add

LC-37SH20U

1.5k ohm 10W

0.15 µF

TEST PROBE

TO EXPOSED METAL PARTS

CONNECT TO KNOWN EARTH GROUND

DVM

AC SCALE

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 ONLY WITH SAME TYPE F701 (8A, 125V) AND F4701, F5701 (3A~, 250V, 115°C) 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 120 volt AC outlet.

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

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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 components having such features are identified by " å"

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and shaded areas in the

Schematic Diagrams

Replacement Parts Lists

. 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.

and

LC-37SH20U

PRECAUTIONS A PRENDRE LORS DE LA REPARATION

La réparation ne peut être effectuée que par un technicien spécialisé qui s'est parfaitement accoutumé à toute vérification de sécurité et aux conseils suivants.

AVERTISSEMENT

1. Pour la sécurité continue, n'entreprendre aucune modification de tout circuit.

2. Débrancher l'alimentation CA avant la réparation.

PRECAUTION: POUR LA PROTECTION CONTINUE CONTRE LES RISQUES D'INCENDIE, REMPLACER LE FUSIBLE PAR UN FUSIBLE DE MEME TYPE F701 (8A, 125V) UND F4701, F5701 (3A~, 250V, 115°C) FUSE.

AVANT DE RENDRE LE RECEPTEUR A L’UTILISATEUR (Incendie et choc électrique)

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:

• Enficher le cordon d'alimentation directement dans une prise de 120V CA.

• 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 CA 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 doit être utilisée dans le but de terminer ces vérifications.) La tension de pointe mesurèe ne doit pas dépasser

0.75V RMS (correspondante au courant CA de pointe de 0.5mA RMS). 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 µF

SONDE D'ESSAI

AUX PIECES METALLIQUES EXPOSEES

BRANCHER A UNE TERRE CONNUE

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AVIS POUR LA SECURITE

De nombreuses pièces, électriques et mécaniques, dans les tél éviseurs de l'afficharge à cristaux liquides présentent des caractéristiques spéciales relatives à la sécurité. Ces caracténstiques 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

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pièces électriques qui présentent ces particularités sont identifiées par la marque " å " et hachurées dans la

des pièces de remplacement schématiques

et les

diagrammes

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 ou autres accidents.

liste

LC-37SH20U

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

LC-37SH20U

SPECIFICATIONS

Item

LCD panel

Number of dots

TV-standard (CCIR)

Function

Brightness

Viewing angles

Audio out

Terminals

Receiving Channel

Audio multiplex

Rear

Model: LC-37SH20U

37" Advanced Super View & BLACK TFT LCD

3,147,264 dots (1366 768 3 dots)

American TV Standard ATSC/NTSC System

VHF/UHF

CATV

Digital Terrestrial Broadcast (8VSB)

INPUT 1

INPUT 2

INPUT 3

INPUT 4

ANTENNA

DIGITAL AUDIO OUTPUT

VHF 2-13ch, UHF 14-69ch

1-135ch* (non-scrambled channel only)

2-69ch

BTSC System

450cd/m

H : 170° V : 170°

10W 2

AV in, COMPONENT in

AV in

S-VIDEO in, AV in

Audio in, HDMI in with HDCP

75 Unbalance, F Type 1 for Analog (VHF/UHF/CATV) and Digital (AIR/CABLE)

Ω

Optical Digital audio output 1 (PCM/Dolby Digital)

××

OUTPUT

OSD language

Power Requirement

Power Consumption

Weight

Dimension

××

(W H D)

Accessories

Operating temperature

* Emergency alert messages via Cable are unreceivable.

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

• improvement without prior notice. The performance speciﬁcation ﬁgures indicated are nominal values of production units. There may be some deviations from these values in individual units.

w/o stand

with stand

w/o stand

with stand

Audio out

English/French/Spanish

AC 120 V, 60 Hz

186 W

46.3 lbs./21.5 kg

53.0 lbs./24.0 kg

Remote control unit (×1), AC cord (×1), “AA” size battery (×2), Cable clamp (×1), Cable tie (×1), Stand unit (×1), Operation manual (×1)

/32 2561/64 445/64 inch

××

/32 285/16 129/32 inch

++ +

32°F to 104°F (0°C to 40°C)

OPERATION MANUAL

Part names

POWER button

TV (Front)

Channel buttons

(CH /)

Volume buttons (VOL /)

INPUT button

POWER indicator*

Remote control sensor

INPUT 4

INPUT 3

AUDIO OUTPUT

DIGITAL AUDIO OUTPUT terminal

Antenna/Cable in

AC INPUT terminal

TV (Rear)

terminals

INPUT 1 terminals

INPUT 2 terminals

terminals

LC-37SH20U

Part names

1 POWER: Switch the TV power on or enter standby

mode.

2 0 – 9: Set the channel.

3 • (DOT):

4 SURROUND: Select Surround settings.

5 FREEZE: Set the still image. Press again to return to

normal screen.

6 SLEEP: Set the sleep timer.

7 EXIT: Turn off the menu screen.

8 CC: Display captions from a closed-caption source.

9 AUDIO: Select the MTS/SAP or the audio mode during

multi-channel audio broadcasts.

10 FAVORITE CH

A, B, C, D: Select four preset favorite channels in four

different categories.

While watching, you can toggle the selected channels by

pressing A, B, C and D

11 DISPLAY: Display the channel information.

12 INPUT: Select a TV input source. (TV, INPUT 1, INPUT 2,

INPUT 3, INPUT 4)

13 MUTE: Mute the sound.

14 VOL /: Set the volume.

15 CH / : Select the channel.

16 ENT: Jump to a channel after selecting with the 0–9

buttons.

17 FLASHBACK: Return to the previous channel or input

external mode.

18 MENU: Display the menu screen.

19 /

///ENTER: Select a desired item on the

screen.

20 RETURN: Return to the previous menu screen.

21 VIEW MODE: Select the screen size.

22 AV MODE: Select an audio or video setting. (STANDARD,

MOVIE, GAME, USER, DYNAMIC (Fixed), DYNAMIC.)

Remote control unit

NOTE

• When using the remote control unit, point it at the TV.

30°30°

QUICK REFERENCE

If the remote control fails to operate TV functions, replace the batteries in the remote control unit.

1 Open the battery cover.

• Place the batteries with their terminals

corresponding to the ( ) and ( )

indications in the battery compartment.

NOTE

Improper use of batteries can result in chemical leakage or explosion. Be sure to follow the instructions below.

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

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

leakage in old batteries.

• Remove batteries as soon as they are worn out. Chemicals that leak from batteries that come in contact with skin can cause

a rash. If you ﬁnd any chemical leakage, wipe thoroughly with a cloth.

• The batteries supplied with this product may have a shorter life expectancy due to storage conditions.

• If you will not be using the remote control unit for an extended period of time, remove batteries from it.

Remote control

sensor

2 Insert two "AA" size batteries

(supplied with the product).

3 Close the battery cover.

IMPORTANT:

The POWER indicator on the television should light GREEN indicating you have power to the television.

If the POWER indicator on the television still does not light up, press POWER on the

remote control to turn the power on.

IMPORTANT:

IF THE UNIT DOES NOT POWER ON - UNPLUG THE TELEVISION FROM THE OUTLET AND REPEAT THE

INSTALLATION STEPS.

IF YOU STILL ENCOUNTER NO POWER, PLEASE CONTACT US AT 1-800-BE-SHARP.

Please refer to the BASIC ADJUSTMENT SETTINGS SECTION for EZ Setup and basic channel setup functions

and USING EXTERNAL EQUIPMENT SECTION for other device connections (DVD, VCR, AUDIO, etc) in your

operation manual.

16'4" (5 m)

+ 17 hidden pages

SHARP LC-37SH20U Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

IMPORTANT SERVICE SAFETY PRECAUTION

SPECIFICATIONS

OPERATION MANUAL