SHARP LC37GB5U Service Manual

LC-37GB5U

SERVICE MANUAL

S45H5LC37GB5U

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.

OUTLINE

This model is based on the LC-37D7U and is equipped with a redesigned speaker, and is changed some function. This Service Manual covers the modifications alone. For the other points, refer to the LC-26/32/ 37D7U Service Manual.

CONTENTS

» LIST OF CHANGED PARTS ...........................................................................................................................2

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

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

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

» DIMENSIONS ............................................................................................................................................14

» REMOVING OF MAJOR PARTS................................................................................................................15

» BLOCK DIAGRAM .....................................................................................................................................22

» OVERALL WIRING DIAGRAM...................................................................................................................24

» PARTS LIST ...............................................................................................................................................26

» PACKING OF THE SET .............................................................................................................................31

LC-37GB5U

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-37GB5U

LIST OF CHANGED PARTS

LC-37D7U → LC-37GB5U

Ref.No. Description LC-37D7U LC-37GB5U Note

PWB ASSEMBLIES

AV Unit DUNTKC971WE01 DUNTKC971WE03 *Some parts changed AV Unit DUNTKD115WE01 DUNTKD115WE03 *Some parts changed KEY Unit DUNTKC972WE01 DUNTKC972WE03 No parts changed KEY Unit DUNTKD116WE01 DUNTKD116WE03 No parts changed R/C LED Unit DUNTKC973WE01 DUNTKC973WE03 *Some parts changed R/C LED Unit DUNTKD117WE01 DUNTKD117WE03 *Some parts changed LCD CONTROL Unit DUNTKC793FE08 DUNTKC793FE33 *Some parts changed MAIN Unit DUNTKC794FE02 DUNTKC794FE03 No parts changed DIGITAL Unit DKEYDC956FE15 DUNTKC956FE07 *Some parts changed POWER SUPPLY Unit RDENCA109WJZZ  INVERTER A Unit RUNTKA099WJZZ  INVERTER B Unit RUNTKA100WJZZ  INVERTER A GND Unit RUNTKA101WJZZ  INVERTER B GND Unit RUNTKA102WJZZ  EXT SP TERMINAL-L Unit DUNTKC974WE01   EXT SP TERMINAL-L Unit DUNTKD118WE01   EXT SP TERMINAL-R Unit DUNTKC975WE01   EXT SP TERMINAL-R Unit DUNTKD119WE01  

LCD PANEL

37” Wide LCD Panel Unit RLCDTA036WJZZ 

AV Unit

R3926 Metal Oxide VRS-CY1JF222JY VRS-CY1JF102JY *Change

R3930 Metal Oxide VRS-CY1JF682JY VRS-CY1JF102JY *Change These parts is deleted from “LC-37D7U”. *Delete Q1110, L1103, C1110, C1113, R1114, R1118, UNT1101

R/C LED Unit

D103 Diode RH-PXA087WJZZY RH-PXA089WJZZY *Change R108 Metal Oxide VRS-CY1JF911JY VRS-CY1JF561JY *Change

LCD CONTROL Unit

R2026 Metal Oxide VRS-CY1JF223JY  *Delete R2029 Metal Oxide  VRS-CY1JF223JY *Add

DIGITAL Unit

IC8451 IC RH-iXB333WJZZQ VHiLHF12F01-1Q *Change

R8176 Metal Oxide  VRS-CH1JF103JY *Add

R9509 Metal Oxide  VRS-CH1JF000JY *Add

R9529 Metal Oxide  VRS-CZ1JF472JY *Add These parts is deleted from “LC-37D7U”. *Delete IC8051, IC8052, IC8454, IC8501~8504, IC9003, IC9402, IC9403, IC9405, IC9406, IC9501~9503, IC9701~9703, Q9002, Q9003, D9001, D9002, D9701~9703, X8501, X9001, X9501, FL8051, L8051~8061, L8501, L8502, L9702, L9703, C8051~8087, C8460, C8461, C8502, C8503, C8505~8534, C9002, C9005, C9006, C9404~9411, C9413, C9415~9417, C9501~9535, C9701~9709, C9711, C9713, C9714, R8051~8054, R8056, R8057, R8465, R8466, R8501~8538, R8540~8555, R9008, R9017, R9018, R9020, R9024, R9026, R9029~9031, R9033, R9035,

R9038~9041, R9043, R9101, R9120, R9401, R9403~9405, R9408~9411, R9413, R9414, R9418, R9501~9504, R9508, R9512, R9514~9519, R9528, R9530~9533, R9701, R9702, R9704~9710, FB8501, FB9001~9003, FB9401~9403, FB9501, FB9502, FB9701, J8052, J8501, J8502, J9001, SC9401, SC9501, LUG9401, LUG9402 CABINET AND MECHANICAL PARTS Please refer to a Parts list. PACKING PARTS AND ACCESSORIES Please refer to a Parts list.

LC-37GB5U

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

» Use an AC voltmeter ha ving with 5000 ohm per v olt,

or higher, sensitivity or measure the A C v oltage drop

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 FUSE.

F701, F702 (5A, 250V) F703 (2A, 250V), F704 (117°C, 2A) F705 (1A, DC450V)

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 0.75 Vrms (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.

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

TO EXPOSED METAL PARTS

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.

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DVM

AC SCALE

1.5k ohm 10W

0.15 µF

TEST PROBE

CONNECT TO KNOWN EARTH GROUND

SAFETY NOTICE

Many electrical and mechanical parts in LCD color 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 b y " å"

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Replacement Parts List

and

LC-37GB5U

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

de 0.15µF en série avec toutes les pièces métalliques exposées du coffret et une terre connue comme une

1. N'entreprendre aucune modification de tout circuit. C'est dangereux.

2. Débrancher le récepteur avant toute réparation.

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

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

F701, F702 (5A, 250V) F703 (2A, 250V), F704 (117°C, 2A) F705 (1A, DC450V)

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 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.)

VERIFICATIONS CONTRE L'INCEN-DIE ET LE CHOC ELECTRIQUE

Avant de rendre le récepteur à l'utilisateur, effectuer les vérifications suivantes.

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.

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,

DVM

ECHELLE CA

1.5k ohm 10W

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 directem-ent à une

0.15 µF

SONDE D'ESSAI

prise de courant de 120V. (Ne pas utiliser de transformateur d'isolation pour cet essai).

• A l'aide de deux fils à pinces, brancher une résistance de 1.5 kΩ 10 watts en parallèle avec un condensateur

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AUX PIECES METALLIQUES EXPOSEES

BRANCHER A UNE TERRE CONNUE

AVIS POUR LA SECURITE

De nombreuses pièces, électriques et mécaniques, dans les téléviseur ACL présentent des caractéristiques spéciales relatives à la sécurité, qui ne sont souvent pas évidentes à vue. Le degré de protection ne peut pas être nécessairement augmentée en utilisant des pièces de remplacement étalonnées pour haute tension, puissance, etc. Les pièces de remplacement qui présentent ces caractéristiques sont identifiées dans ce manuel; les pièces électriques qui présentent ces particularités sont

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121

identifiées par la marque " å " et hachurées dans la

liste des pièces de remplacement schématiques

et les

diagrammes

Pour assurer la protection, ces pièces doivent être identiques à celles utilisées dans le circuit d'or igine. 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-37GB5U

Precautions for using lead-free solder

1 Employing lead-free solder

"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 ser vice 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, remov e 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 allo y ed 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-37GB5U

SPECIFICATIONS

Item 37" LIQUID CRYSTAL TELEVISION,

Model: LC-37GB5U

LCD panel 37" Advanced Super View & BLACK TFT LCD

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

TV Function

Brightness 450 cd/m

Viewing angles H : 170° V : 170°

Audio out 10W 2

Terminals AV in, COMPONENT in

TV-standard (CCIR)

Receiving Channel

Audio multiplex BTSC System

Rear INPUT 1

VHF/UHF

CATV 1-125ch

Digital Terrestrial Broadcast (8VSB)

American TV Standard ATSC/NTSC System

VHF 2-13ch, UHF 14-69ch

2-69ch

INPUT 2

INPUT 3

INPUT 4 HDMI in (Type-A) with HDCP

INPUT 5 Audio in, DVI-I in with HDCP

ANALOG ANTENNA

DIGITAL ANTENNA

DIGITAL AUDIO OUTPUT

MONITOR OUTPUT

OSD language English/French/Spanish

Power Requirement

Power Consumption

Weight

Display with stand

Accessories Operation manual ( 1), Remote control unit ( 1), AC cord ( 1), "AAA" size

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.

AV in, COMPONENT in

S-VIDEO in, AV in

Ω

75 Unbalance, F Type for VHF/UHF/CATV in 1

Ω

75 Unbalance, F Type for Digital Air in 1

Optical Digital audio output 1 (PCM/Dolby Digital)

S-VIDEO out, AV out

AC 120 V, 60 Hz (FOR NORTH AMERICA) AC 110-240 V, 50/60 Hz(FOR OTHERS)

189 W (0.2 W Standby with AC 120 V)

42.4 lbs./19.2 kgDisplay only

50.1 lbs./22.7 kg

battery ( 2), Cable clamp ( 1), Cable tie ( 1)

×××

OPERATION MANUAL

Part names

TV (Front)

TV (Rear)

POWER indicator**

OPC sensor*

POWER (On/Off)

button

INPUT

button

Volume buttons (VOL /)

Channel buttons

(CH / )

Remote control sensor

OPC indicator*

RESET*

INPUT 3

terminals

SYSTEM

RESET**

DIGITAL

AUDIO

OUTPUT

* Press RESET if the TV cannot return to its original state after performing various operations.

AV MODE resets to DYNAMIC (Fixed)

TV channel returns to initial channel setting (Air: 2ch, Cable:1 or 2ch)

Audio setting initializes

Dolby Virtual resets to Off

Image position initializes

**Press SYSTEM RESET if the TV does not operate after starting up.

NOTE

Pressing RESET will not work if the TV is in standby mode.

Pressing RESET will not delete channel preset or secret number.

AC INPUT

terminal

RS-232C

terminal

INPUT 2

terminals

INPUT 1

terminals

INPUT 5

terminals

INPUT 4

terminal

MONITOR

OUTPUT

terminals

Antenna input

terminal (ANALOG)

Antenna input terminal

(DIGITAL)

LC-37GB5U

P Using external equipmentart names

Remote control unit

NOTE

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

111

718

820

10 25

1TV POWER: Switches the TV power on or enters

standby mode.

2 DISPLAY: Displays the channel information.

3 SOURCE POWER: Turns the power of the external

equipment on and off.

4 External equipment operational buttons: Operates

the external equipment.

5 0 9/ (DOT): Sets the channel.

6VOL /: Sets the volume.

Virtual: Selects Virtual Dolby Surround settings.

8 EXIT: Turns off the menu screen.

9 SLEEP: Sets the sleep timer.

10 AUDIO: Selects the MTS/SAP or the audio mode during

multi-channel audio broadcasts.

11 FUNCTION: Switches the remote control for TV, CBL/

SAT, VCR, DVD and AUDIO operation. Indicator lights

up for the current mode.

* To enter the code registration mode, you need to press

FUNCTION and DISPLAY at the same time.

: When pressed all buttons on the remote control unit

will light. The lighting will turn off if no operations are

performed within about 5 seconds. This button is used

for performing operations in low-light situations.

13 VIEW MODE: Selects the screen size.

14 FLASHBACK: Returns to the previous channel or

external input mode.

15 INPUT: Selects a TV input source. (TV, INPUT 1, INPUT

2, INPUT 3, INPUT 4, INPUT 5)

16 CH / : Selects the channel.

17 MUTE: Mutes the sound.

18 MENU: Displays the menu screen.

19 ////ENTER: Selects a desired item on the

screen.

20 RETURN: Returns to the previous menu screen.

21 FAVORITE CH

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

different categories.

While watching, you can toggle the selected channels

by pressing A, B, C and D.

22 FREEZE: Sets the still image. Press again to return to

normal screen.

23 CC: Displays captions during closed-caption source.

24 EDIT: Registers favorite channel.

25 AV MODE: Selects an audio or video setting.

(AV mode: STANDARD, MOVIE, GAME,

USER, DYNAMIC (Fixed), DYNAMIC. PC mode:

STANDARD, USER.)

You can connect many types of external equipment to your TV, like a DVD player, VCR, Digital TV tuner, PC,

HDMI equipment, game console and camcorder. To view external source images, select the input source from

INPUT on the remote control unit or on the TV.

CAUTION

To protect all equipment, always turn off the TV before

connecting to a DVD player, VCR, Digital TV tuner, PC,

HDMI equipment, game console, camcorder or other

external equipment.

NOTE

Please refer to the relevant operation manual (DVD player,

PC, etc.) carefully before making connections.

Each time INPUT is pressed, the input source toggles.

Refer to your external equipment operation manual for

the signal type.

Displaying an external equipment

image

Explanation here is for the setting when connecting

DVD to INPUT1 terminal.

INPUT button

To watch a DVD image, select "INPUT1" from "INPUT

SOURCE" menu using INPUT on the remote control

unit or on the TV.

INPUT SOURCE

TV(Air)

TV(Cable)

INPUT1

INPUT2

INPUT3

INPUT4

INPUT5

[

Option

...

Input Select

]

Auto

COMPONENT

VIDEO

For INPUT1 signal

Select the desired signal type.

The setting is stored and can be selected on the

"INPUT SOURCE" menu.

Press MENU and the MENU screen displays.

Press / to select "Input Select", and then

press ENTER.

Press / to select "Option".

NOTE

If the image does not come in clearly, you may need to

change the input signal type setting on the "Input Select"

menu.

Selecting the INPUT signal

(Example)

Using external equipment

DVD player

Connecting a DVD player

You can use the INPUT 1, INPUT 2, INPUT 3 and INPUT 5 terminals when connecting to a DVD player and other

audiovisual equipment.

AV cable

(commercially available)

DVD player

ø 3.5 mm stereo minijack cable

(commercially available)

DVI cable (commercially available)

When using component cable. (INPUT 1 or 2)

When using composite cable. (INPUT 1, 2 or 3)

When using DVI cable. (INPUT 5)

Component video cable

(commercially available)

Audio cable

(commercially

available)

VCR/Game console/

Camcorder

AV cable

(commercially available)

Connecting a VCR, game console or camcorder

A VCR, game console, camcorder and some other audiovisual equipment are conveniently connected using

the INPUT 1 to 3 terminals.

S-video cable

(commercially available)

NOTE

The S-video terminal has priority over the video terminals. (INPUT 3 only)

LC-37GB5U

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