SHARP LC-32G4U, LC-32G4D, LC-37G4U, LC-37G4D. Service Manual

LC-32G4U/G4D

LC-32G4U/G4D LC-37G4U/G4D

SERVICE MANUAL

S44S4LC-37G4U

LCD COLOR

TELEVISION (Display)

LC-32G4U/G4D

MODELS

LC-37G4U/G4D

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

CONTENTS

Page

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

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

» OPERA TION MANUAL ........................................6

» DIMENSIONS ....................................................10

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

» ADJUSTMENT PROCEDURES.........................20

» TROUBLE SHOOTING TABLE.......................... 26

» MAJOR IC INFORMATIONS..............................30

LC-37G4U/G4D

Page

» CHASSIS LAYOUT ............................................40

» OVERALL WIRING DIAGRAM .......................... 42

» BLOCK DIAGRAM ............................................. 44

» DESCRIPTION OF SCHEMATIC DIAGRAM..... 46

» SCHEMATIC DIAGRAM .................................... 47

» PRINTED WIRING BOARD ASSEMBLIES .......88

» PARTS LIST.....................................................104

» PACKING OF THE SET ................................... 133

SHARP CORPORATION

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

LC-32G4U/G4D

2 2

LC-37G4U/G4D

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 having with 5000 ohm per volt,

or higher, sensitivity or measure the AC voltage drop

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

2. Disconnect AC power before servicing.

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

A V

CAUTION: FOR CONTINUED

PROTECTION AGAINST A RISK OF FIRE REPLACE ONLY WITH SAME TYPE FUSE. LCD SIDE:F2701, F2702 (4A, 250V),

F2703 (2A, 250V)

LC-32G4U/G4D:F7401,F7501(6.3A,250V) LC-37G4U/G4D:F7401,F7501(10A,250V)

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 110~240 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 F

TEST PROBE

CONNECT TO KNOWN EARTH GROUND

SAFETY NOTICE

Many electrical and mechanical parts in Liquid Crystal 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

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components having such features are identified by “ å” and shaded areas in the Replacement Parts List 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.

LC-32G4U/G4D

LC-37G4U/G4D

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

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

CÔTÉ LCD: F2701,F2702(4A,250V),

A V

LC-32G4U/G4D:F7401,F7501(6.3A,250V) LC-37G4U/G4D:F7401,F7501(10A,250V)

F2703 (2A, 250V)

VERIFICA TIONS 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 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 1.5 kΩ 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

0.7 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

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

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identifiées par la marque " å " et hachurées dans la liste des pièces de remplacement et les diagrammes schématiques. Pour assurer la protection, ces pièces doivent être identiques à celles utilisées dans le circuit d'origine. L'utilisation de pièces qui n'ont pas les mêmes caractéristiques que les pièces recommandées par l'usine, indiquées dans ce manuel, peut provoquer des électrocutions, incendies, radiations X ou autres accidents.

LC-32G4U/G4D LC-37G4U/G4D

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 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-32G4U/G4D LC-37G4U/G4D

Specifications

Item 32” LIQUID CRYSTAL TELEVISION, 37” LIQUID CRYSTAL TELEVISION,

Model: LC-32G4U/G4D (Display) Model: LC-37G4U/G4D (Display)

LCD panel Number of dots TV TV-standard (CCIR) American TV Standard NTSC System Function Receiving VHF/UHF VHF 2-13ch, UHF 14-69ch

Channel CATV 1-125ch

Audio multiplex BTSC System Brightness Viewing angles H : 170° V : 170° Audio amplifier 10W x 2 Speakers Ø 8cm 2pcs, Ø 2.5cm 2pcs OSD language English/French/Spanish Power Requirement AC 110-240 V, 50/60 Hz Power Consumption Weight Display 28.7 lbs./13 kg (Display only), 38.6 32.0 lbs./14.5 kg (Display only), 43 lbs./

Display 127W(0.2W Standby with AC 120 V) 168W (0.2W Standby with AC 120 V)

32” Advanced Super View & BLACK TFT LCD 37” Advanced Super View & BLACK TFT LCD 3,147,264 dots (1366 x 768 x 3 dots)

450 cd/m2

lbs./17.5 kg (with Display and 19.5 kg (with Display and speaker), speaker), 48.5 lbs./22 kg (with Display, 52.9 lbs./24 kg (with Display, speaker speaker and stand) and stand)

Specifications are subject to change without prior notice.

LC-32G4U/G4D LC-37G4U/G4D

Operation Manual

LC-32G4U/G4D LC-37G4U/G4D

LC-32G4U/G4D

Dimensions

LC-37G4U/G4D

LC-32G4U/G4D LC-37G4U/G4D

REMOVING OF MAJOR PARTS

LC-32G4U/G4D

1. Remove the terminal covers 1 and 2.

2. Remove the 2 SP terminal rubber covers 3 to disconnect each SP wires.

3. Remove the 2 SP bracket cover mounting screws 4 to detach the SP bracket covers.

4. Remove the 6 speaker mounting screws 5 to detach the speakers.

5. Remove the 4 stand mounting screws 6 to detach the stand.

6. Disconnect each SP wire cover.

7. To detach cabinet B, remove the cabinet lock screws, the 13 M4 plastic screws 7, the 2 M4 machine screws 8, the 3 M3 plastic screws 9, and the 2 M3 machine screws 0.

Speaker

SP Terminal Rubber Cover

SP Wire

SP Bracket Cover

Cabinet B

Terminal Cover (Top)

Speaker

SP Wire Cover

SP Wire

Stand

SP Wire Cover

SP Terminal Rubber Cover

Terminal Cover (Bottom)

SP Bracket Cover

LC-32G4U/G4D

Top Operation Section Assembly

Wire Holder

FPC

Shield Plate

Earth Plate

LC-37G4U/G4D

8.Remove the Earth Plate and the 13 Shielding Plate mounting screws q to detach the Earth Plate, the Shielding Plate and the wire holder.

9.Remove the 2 top operation section assembly mounting screws w.

10.Remove the FPC. (with ferrite core)

11.Remove the 16 leads from fluorescent lights e.

12.Remove the 4 angles r.

13.Remove the 1 TMDS RX PWB mounting screw t.

TMDS RX PWB

LC-32G4U/G4D LC-37G4U/G4D

14. Remove the LCD CONT PWB mounting screw y to detach the LCD CONT PWB.

15. Remove the 6 POWER SUPPLY PWB mounting screws u to detach the POWER SUPPLY PWB.

16. Remove the 2 R/C LED PWB mounting screws i to detach the R/C LED PWB.

17. Remove the 4 INVERTER-1 PWB mounting screws o to detach the INVERTER-1 PWB.

18. Remove the 4 INVERTER-2 PWB mounting screws p to detach the INVERTER-2 PWB.

19. Remove the 3 INVERTER-1 GND PWB mounting screws a to detach the INVERTER-1 GND PWB.

20. Remove the 3 INVERTER-2 GND PWB mounting screws s to detach the INVERTER-2 GND PWB.

21. Remove the 4 SPEAKER TERMINAL PWB mounting screws d to detach the SPEAKER TERMINAL PWB.

22. Remove the 4 fan mounting screws f to detach the 2 fans.

23. Remove the 4 chassis mounting screws g, and remove the backlight chassis from cabinet A.

POWER SUPPLY PWB

INVERTER-1 GND PWB

INVERTER-2 GND PWB

FAN

LCD CONT PWB

FAN

Backlight Chassis

INVERTER-1 PWB

INVERTER-2 PWB

R/C LED PWB

Remove the connector.

SPEAKER TERMINAL PWB

LC-32G4U/G4D LC-37G4U/G4D

• Precautions in handling the LCD panel

1. Handle the liquid crystal panel in a clean room (Humidity: 50% or more).

2. Be sure to wear an earth wristband.

3. Be careful not to drop and shock the liquid crystal panel.

4. Use an ionizer (within 30 cm).

24. Remove the 5 screws h (LX-BZA051WJFN).

25. Remove the LCD panel unit.

26. Remove the 8 screws j (LX-BZA052WJFN).

27. Remove the sheet presser angles.

28. Remove the 6 screws k (XBPSN30P10000).

29. Remove the sheet presser angles.

30. Detach the reflection/deflection sheet, prism sheet, diffusion sheet, and diffusion plate.

31. Remove the 6 screws l (XBBSN30P08000).

32. Remove the 2 lamp holders (top).

33. Detach the lamps.

* The reflection plate (PMIR-S040WJZZ) is attached to the backlight chassis using clips and two-sided tape, and it

cannot be disassembled.

LCD Panel Unit

Lamp Holder (Top)

Lamp

Lamp Holder (Bottom)

Backlight Chassis

Lamp Holder (Bottom)

Lamp Holder (Top)

Sheet Presser Angle

Diffusion Panel

Diffusion Sheet

Prism Sheet

Reflection/Deflection Sheet

LC-32G4U/G4D LC-37G4U/G4D

LC-37G4U/G4D

1. Remove the terminal covers 1 and 2.

1.1.

2. Remove the SP terminal rubber covers 3 to disconnect each SP wires.

Re-

3. Remove the 2 SP bracket cover mounting screws 4 to detach the SP bracket covers.

4. Remove the 4 speaker mounting screws 5 to detach the speakers.

move

5. Remove the 4 stand mounting screws 6 to detach the stand.

the

6. Disconnect each SP wire covers.

ter-

7. To detach cabinet B, remove the cabinet lock screw, the 13 M4 plastic screws 7, the 2 M4 machine screws 8,

mi-

the 3 M3 plastic screws 9, and the 2 M3 machine screws 0.

nal covers (1) and (2)

SP Terminal

Rubber Cover

2. Re-

move the 4 stand

mounting screws (3) , and separate the stand from the

SP Bracket Cover

Speaker

SP Wire

Terminal Cover (Top)

SP Wire Cover

Stand

Cabinet B

Speaker

SP Wire Cover

Terminal Cover (Bottom)

SP Bracket Cover

SP Wire

SP Terminal Rubber Cover

main unit. Then, put the main unit in

LC-32G4U/G4D

Top Operation Section Assembly

FPC

Shield Plate

Earth Plate

LC-37G4U/G4D

8. Remove the Earth Plate and the 13 Shielding Plate mounting screws q to detach the Earth Plate and the Shielding Plate.

9. Remove the 2 top operation section assembly mounting screws w.

10. Remove the FPC. (with ferrite core)

11. Remove the 18 leads from fluorescent lights e.

12. Remove the 4 angles r.

13. Remove the 1 TMDS RX PWB mounting screw t.

TMDS RX PWB

LC-32G4U/G4D LC-37G4U/G4D

14. Remove the LCD CONT PWB mounting screw y to detach the LCD CONT PWB.

15. Remove the 6 POWER SUPPLY PWB mounting screws u to detach the POWER SUPPLY PWB.

16. Remove the 2 R/C LED PWB mounting screws i to detach the R/C LED PWB.

17. Remove the 4 INVERTER-1 PWB mounting screws o to detach the INVERTER-1 PWB.

18. Remove the 4 INVERTER-2 PWB mounting screws p to detach the INVERTER-2 PWB.

19. Remove the 4 INVERTER-1 GND PWB mounting screws a to detach the INVERTER-1 GND PWB.

20. Remove the 4 INVERTER-2 GND PWB mounting screws s to detach the INVERTER-2 GND PWB.

21. Remove the 4 SPEAKER TERMINAL PWB mounting screws d to detach the SPEAKER TERMINAL PWB.

22. Remove the 4 fan mounting screws f to detach the 2 fans.

23. Remove the 4 chassis mounting screws g, and remove the backlight chassis from cabinet A.

POWER SUPPLY PWB

INVERTER-1 GND PWB

INVERTER-2 GND PWB

FAN

LCD CONT PWB

FAN

Backlight Chassis

INVERTER-1 PWB

INVERTER-2 PWB

R/C LED PWB

Remove the connector.

SP TERMINAL PWB

LC-32G4U/G4D LC-37G4U/G4D

• Precautions in handling the LCD panel

1. Handle the liquid crystal panel in a clean room (Humidity: 50% or more).

2. Be sure to wear an earth wristband.

3. Be careful not to drop and shock the liquid crystal panel.

4. Use an ionizer (within 30 cm).

24. Remove the 5 screws h (LX-BZA051WJFN).

25. Remove the LCD panel unit.

26. Remove the 8 screws j (XBPSN30P06000).

27. Remove the sheet presser angles.

28. Remove the 6 screws k (XBPSN30P10000).

29. Remove the sheet presser angles.

30. Detach the reflection/deflection sheet, prism sheet, diffusion sheet, and diffusion plate.

31. Remove the 6 screws l (XBBSN30P08000).

32. Remove the lamp holders (top).

33. Detach the lamps.

* The reflection plate (PMIR-S041WJZZ) is attached to the backlight chassis using clips and two-sided tape, and it

cannot be disassembled.

LCD Panel Unit

Lamp Holder (Top)

Lamp

Lamp Holder (Bottom)

Backlight Chassis

Lamp Holder (Bottom)

Lamp Holder (Top)

Sheet Presser Angle

Diffusion Panel

Diffusion Sheet

Prism Sheet

Reflection/Deflection Sheet

LC-32G4U/G4D LC-37G4U/G4D

ADJUSTMENT PROCEDURES

The adjustment values are set to the optimum conditions at the factory before shipping. If a value should become improper or an adjustment is required due to part replacement, make an adjustment according to the following procedure.

(On the display)

1. If the monitor microcomputer (IC2004), receiver IC (IC2206), or HDCP key ROM (IC2208) are replaced, please note that the display unit must be replaced. Applicable unit : DKEYHC269VJ

2. Adjusting procedure Entering the adjustment process mode → COM BIAS adjustment → White adjustment

3. Entering the adjustment process mode (1) When the AVC system is not connected

• While the main power to the display is off, hold down the "CH(Ù)" key and "VOL (+)" key on the upper part of the display and then turn the"MAIN POWER" "ON". The display will run in the "Display process mode".

(2) When the AVC system is connected

• While the main power of the display is off, hold down the "CH(Ù)"key and "VOL (+)" key on the upper

part of the display and then turn the "MAIN POWER" "ON". The display will run in the "Display process mode".

∗∗

In each case of (1) and (2), "<K>" is displayed in the upper left portion of the screen.

Then, pressing any key will bring you to the first page of the "Display Adjustment mode".

~ To exit the adjustment process mode, turn OFF the main power.

4. Adjustment process mode key operation table

Key Cursor UP

Cursor DOWN

Cursor RIGHT

Cursor LEFT

ENTER

INPUT CH (ù)

CH (Ù)

VOL (+)

VOL (–)

Function 1 (when on the left side of a page) Moving up by one item or moving to the previous page (when at the top) Moving down by one item or moving to the next page (when at the bottom) Moving to the right by one item or moving to another page (in the case of the initial page) Moving to the left by one item or moving to another page (in the case of the initial page) Test pattern off

Moving to the next page Moving up by one item or moving to the previous page (when at the top) Moving down by one item or moving to the next page (when at the bottom) Moving to the right by one item or moving to another page (in the case of the initial page) Moving to the left by one item or moving to another page (in the case of the initial page)

Function 2 (when changing a numeric value) Incrementing the adjustment value by one or executing the item (in the case of W or R items) Decrementing the adjustment value by one or executing the item (in the case of W or R items) Moving to the right by one item

Moving to the left by one item

Executing the item (in the case of W or R items)

Moving to the next page Incrementing the adjustment value by one or executing the item (in the case of W or R items) Decrementing the adjustment value by one or executing the item (in the case of W or R items) Moving to the right by one item

Moving to the left by one item

LC-32G4U/G4D LC-37G4U/G4D

5. Adjustment 5-1.COM BIAS adjustment

Shift to the "COM BIAS" item with the cursor UP/DOWN key and select a numeric value with the cursor RIGHT/LEFT key. Changing the numeric value with the cursor UP/DOWN key will make appear the test pattern. Make an adjustment so that the flicker near the center of the screen is minimized.

5-2.White balance adjustment

Connect the AVC system, start the unit, and then perform a white balance adjustment on the display. Changing the numeric value with the cursor UP/DOWN key will make appear the test pattern. Make an adjustment so that the flicker near the center of the screen is minimized.

• Procedure

• Bring up the adjustment display (High side: 200 gradations, Low side: 48 gradations).

• Adjust "R GAMMAL" "G GAMMAL" "B GAMMAL" so that the 48 gradation pattern becomes normal.

Adjust the chromaticity of the Low pattern (on the right of the display) so that it is set to x = 0.276 and y = 0.283.

• Adjust "R GAMMAH" "G GAMMAH" "B GAMMAH" so that the 200 gradation pattern becomes normal. Adjust the chromaticity of the High pattern (on the left of the display) so that it is set to x = 0.295 and y = 0.305.

6. Software Upgrade for Monitor Microcomputer.

For this model, the software version of the monitor microcomputer can be upgraded via the AVC system. An SD card is used to upgrade the version. For details of the procedure, method etc., refer to the Service

Manual for LC-32/37G4U (AVC SYSTEM).

LC-32G4U/G4D LC-37G4U/G4D

Lamp error detection

1. Feature description This liquid-crystal color TV incorporates a lamp error detection feature (lamp error detection) that automatically turns OFF the power for safety under abnormal lamp or lamp circuit conditions. If anything is wrong with the lamp or lamp circuit or the lamp error detection feature is activated for some reason, the following will result.

1 The power of TV main body is turned OFF about six seconds after it is turned ON. (The power LED on

the front of the TV turns red from green and keeps blinking in red (ON for 250ms and OFF for 1sec).)

2 If 1 occurs five times consecutively, it becomes impossible to turn ON the power. (The power LED

keeps blinking in red (ON for 250ms and OFF for 1sec).)

2. Measures 2-1.Checking with lamp error detection OFF

While the "MAIN POWER" switch is off, hold down the "CH(Ù)" and "VOL(+)" keys and then turn the "MAIN

POWER" on. The display will run in the "Display process mode" ("<K>" will appear.). If there is a problem with a lamp or a lamp circuit, the lamp will go out. (The power LED is green.) Then, you can check the operation to see if the lamp and lamp circuit are abnormal.

2-2.Resetting the lamp error count

After you have finished checking whether the lamp and lamp circuit are abnormal, reset the lamp error

count. If a lamp error is detected five consecutive times, the power cannot be turned on. Therefore, move to the "L ERR RESET" line, the fourth line on the first page of the "Display adjustment mode",using the Cursor UP/DOWN key. Then, reset the "L ERR RESET" value using the "Cursor LEFT/

RIGHT" key.

In this case, press the "Cursor UP/DOWN" key to reset it to "0".

First page of the display ajustment process

SERVICE GRAYLEVEL COMBIAS VLSBIAS L ERR RESET LCD PATTERN MOTOR AND FAN OTHER VER M1.∗∗

Then perform operation checking and check that the lamp error detection feature is not activated.

32/37GA2U 100 177 041 5

CEEPD

Normal values of individual displays

Reset to "0"

Tableofcontentsofprocessmode Page0 LCD Page1

LCD Page2

LCD Page3

LCD Page4

PATTERN Page1

PATTERN Page2

OTHER  Page1

SERVICE   32/37GA2U →ＧＲＡＹＬＥＶＥＬ ０００ ＣＯＭＢＩＡＳ ０００ ＶＬＳＢＩＡＳ ０００ ＬＥＲＲＲＥＳＥＴ ０ ＬＣＤ ＰＡＴＴＥＲＮ ＳＯＵＮＤＡＮＤＦＡＮ ＯＴＨＥＲ ＶＥＲＭ１００ＣＥＥＰ７

ＬＣＤ3 →ＯＰＣ０ ００ ＯＰＣ１ ００ ＯＰＣ２ ００ ＯＰＣ３ ００ ＯＰＣ４ ００ ＯＰＣ５ ００ ＯＰＣ６ ００ ＯＰＣ７ ００ ＯＰＣ８ ００

ＬＣＤ4 →ＯＰＣ ９  ００ ＯＰＣ１０  ００ ＯＰＣ１１ ００ ＯＰＣ１２ ００ ＯＰＣ１３ ００ ＯＰＣ１４ ００ ＯＰＣ１５ ００ ＯＰＣ１６ ００ 

OTHER1 →CLRMODE ０００  W０ LCDDATA ０００  R０W０ EEPC ０００００００  R０W０ SII861 ００００００  R０W０ 

ＬＣＤ2 →ＭＯＤＥ 60Hz ０ QＳＳＷ ００００ QＳＤ１  ００  QＳＤ２  ００ QＳＤ３  ００ QＳＤ４  ００ QＳＤ５  ００ QＳＤ６  ００ QＳＤ７  ００

ＬＣＤ1 →ＭＯＤＥ 60Hz０ ＰＷＭＣＴＲＬ  ００００ ＰＷＭＦＲＥＱ  ００００ ＰＷＭＤＵＴＹ  ００００ ＰＨＡＳＥＤＩＦ  ０００ ＰＣＬＫ１   ＰＣＬＫ２  

ＰＡＴＴＥＲＮ1 →ＰＡＴＴＥＲＮ１  ００ ＰＡＴＴＥＲＮ２  ００ ＰＡＴＴＥＲＮ３  ００ ＰＡＴＴＥＲＮＲ  ００ ＰＡＴＴＥＲＮＧ  ００ ＰＡＴＴＥＲＮＢ  ００ ＰＡＴＴＥＲＮA  ００ 

ＰＡＴＴＥＲＮ2 →RESERVE  ００ RESERVE ００ RGAMMAL  ００ GGAMMAL  ００ BGAMMAL  ００ RGAMMAH ００ GGAMMAH ００ BGAMMAH ００ 

•List of process adjustment modes

LC-32G4U/G4D LC-37G4U/G4D

Process adjustment list

1st level Page Item Setting range Initial value

Contents 1 GRAYLEVEL 0~255 100

COMBIAS 0~255 160 VLSBIAS 0~255 41 L ERR RESET Zero clear 0

LCD 1 MODE 50Hz, 60Hz, PC 60Hz

PWMCTRL 0~7 3 PWMFREQ 0~4095 1289 PWMDUTY1 0~4095 167 PWMDUTY2 0~4095 167 PHASEDIF 0~255 0 PCLK1 0~3 0 PCLK2 0~7 0

2 MODE 50Hz, 60Hz, PC 60Hz

QS SW 0~255 0 QS D1 0~255 84 QS D2 0~255 98 QS D3 0~255 109 QS D4 0~255 120 QS D5 0~255 132 QS D6 0~255 145 QS D7 0~255 157

3 OPC 0 0~99 0

OPC 1 0~99 5 OPC 2 0~99 9 OPC 3 0~99 13 OPC 4 0~99 18 OPC 5 0~99 22 OPC 6 0~99 27 OPC 7 0~99 31 OPC 8 0~99 36

4 OPC 9 0~99 40

OPC 10 0~99 45 OPC 11 0~99 49 OPC 12 0~99 53 OPC 13 0~99 58 OPC 14 0~99 62 OPC 15 0~99 67 OPC 16 0~99 71

5 VH0 0~1023 162

VL0 0~1023 939 VH1 0~1023 403 VL1 0~1023 694 VH20 0~1023 467 VL20 0~1023 619 VH47 0~1023 479 VL47 0~1023 580

6 VH63 0~1023 510

VL63 0~1023 548 VH95 0~1023 555 VH95 0~1023 502 VH127 0~1023 597 VL127 0~1023 462 VH191 0~1023 930 VL191 0~1023 107

LC-32G4U/G4D LC-37G4U/G4D

1st level Page Item Setting range Initial value

PATTERN 1 PATTERN 1 0~14 0

PATTERN 2 0~12 0 PATTERN 3 0~5 0 PATTERN 4 0~5 0 PATTERN R 0~255 0 PATTERN G 0~255 0 PATTERN B 0~255 0 PATTERN A 0~255 0

2 R GAMMA L 0~255 48

G GAMMA L 0~255 48 B GAMMA L 0~255 48

R GAMMA H 0~255 200 G GAMMA H 0~255 200 B GAMMA H 0~255 200

MOTOR 1 FAN START 0~255 224

FAN STOP 0~255 230 TEMP ERR 0~255 55

OTHER 1 CLR MODE 0~4 -

LCD DATA 0~FF EEP C 0~FF SII861 0~FF -

2 L ERR STOP 0~1 -

MOEL 0~15 REMOCON 0~1 OSTEMP AD 0~255 AD value OPC AD 0~255 AD value

LC-32G4U/G4D

No picture and no sound

Is the power LED lit green? Is the power LED flashing red?

Did it flash once?

Did it flash twice?

Did it flash five times?

Did it flash six times?

Does the message "LOSS OF

SYNC" appear?

Go to "No picture".

Does the backlight fail to light?

Check the lamp and the peripheral

lamp circuit.

Is the power cord normal? Replace the power cord.

Go to "The backlight does not light."

Check the power unit.

Check the temperature of the unit.

Check the fan connection.

Check the peripheral parts around

the TMDS PWB.

Yes

LC-37G4U/G4D

TROUBLE SHOOTING TABLE

LC-32G4U/G4D

Type of error LED operation (1 cycle)

Cable error

AVC power error

Flashes once: Slow

H: Lit

L: Not lit

Lamp error

Flashes once: Fast

H: Lit

L: Not lit

Monitor power error

Flashes twice

H: Lit

L: Not lit

AVC FAN error

Flashes four times

H: Lit

L: Not lit

Monitor temperature error

Flashes five times

H: Lit

L: Not lit

Monitor FAN error

Flashes 6 times

H: Lit

L: Not lit

AVC temperature error

Flashes three times

H: Lit

L: Not lit

LED flashing timing chart

250ms 1s

No picture

Is the RESET terminal on pin 3 of

IC2206 H?

Is X2201 oscillating?

Check its peripheral circuits.

Is the clock output present at pin

102 on IC2206?

Check the IC2206 peripheral circuit.

Is the clock output present at pin 40

on IC4602?

Check the FFC connection between

the TMDS PWB and the LCD

CONT PWB.

Does the adjustment process menu

appear?

Check the IC4701 and IC4901

peripheral circuits.

Check the IC4501 peripheral circuit.

Yes

LC-37G4U/G4D

LC-32G4U/G4D

A data bit is missing.

When PATTERN1 is selected from

the adjustment process menu and it

is set to 2, is the gradation pattern

displayed correctly?

Connect SC4651 and SC4652, and

check the IC4501 peripheral circuit.

When PATTERN1 is selected from

the adjustment process menu and

PATTERN3 is set to 1, is the

gradation pattern displayed

correctly?

Check IC4702, IC4902, and their

peripheral circuits.

When PATTERN3 in the adjustment

process menu is set to 4, is the

pattern correctly displayed at one-

dot intervals?

Check between IC4701 and IC4501.

When PATTERN3 in the adjustment

process menu is set to 5, is the

pattern correctly displayed at one-

dot intervals?

Check the IC2206 peripheral circuit.

Check between IC4901 and IC4501.

Yes

When the QS driver is activated,

noise is seen in the images.

Check IC4701, IC4901, and the

peripheral circuits.

Are the GND1 PWB and the LCD

CONT PWB properly connected

with a cable?

Is the OSTEMP AD value on the

third page of the process

adjustment mode set to 255?

Connect them properly or replace

the cable.

Are the GND1 PWB and the GND2

PWB properly connected with a

board-to-board connector?

Connect them properly.

Is 5V present at pin 62 on IC2004

(the microcomputer)?

The thermistor on the GND2 PWB

is defective.

Pin 62 on IC2004 is defective.

Yes

The backlight does not light.

Has the fuse for F7401 or F7501

blown?

Check the circuits after replacing

the fuse.

Is power supplied to each inverter

PWB?

Is the control signal being output at

pins 3, 4, and 5 of P7705 on the

LCD CONT PWB?

Check the fluorescent lamp

connector and the inverter circuit.

See if the cable is connected

between PWBs.

Check the IC4501 peripheral

circuits.

Yes

LC-37G4U/G4D

LC-32G4U/G4D

No sound. (Connect the AVC system

and check.)

Connect them correctly, or replace

the cable.

Are P2201 and P202 connected

correctly with a cable?

Are the speaker and the audio

output terminal connected correctly

with a cable?

Connect them correctly, or replace

the cable.

Is the audio signal output to P2201?

Check if sound is heard from the

AVC system.

Replace the cable between the

TMDS PWB and the audio output

terminal PWB.

Yes

The display is entirely whitish or

dark. (LCD power)

When the AVC system is connected

and the picture is checked, is the

display all white or all black?

Check the AVC system.

Check the supply voltage supplied

to the panel.

(Check it at SC4651 and SC4652.)

Remove the FPC that is connected

to SC4651 and SC4652.

(To prevent the panel from breaking)

When PATTERN1 is selected from

the adjustment process menu and

PATTERN1 is set to 2, is the

gradation pattern displayed

correctly?

(Is it too light or too dark?)

Yes

LC-37G4U/G4D

LC-32G4U/G4D LC-37G4U/G4D

MAJOR IC INFORMATIONS

•IC2004 (IXA870WJ) This is a microcomputer monitor. It controls the OSD on the monitor, the panel temperature detected by a thermistor, the temperature parameter setting for the QS driver, the timing for a liquid crystal controller, dimmer control data settings, power on the monitor, and it monitors each power line, decodes the remote control, and the OPC control.

•IC2206 (SII861) This is a DVI receiver. A 24-bit RGB signal, H and V synchronized signals, and a DE signal are output on ODD and EVEN from the TMDS differential signal that is transmitted by the system cable.

•IC4501 (IXA865WJ) This is a liquid crystal controller. Using the 24-bit RGB signal, H and V synchronized signals, and DE signal that are extracted from the QS driver (ODD, EVEN), the picture data is divided into ODD and EVEN on the left and right of the liquid crystal panel, and a control signal is output to drive the liquid crystal panel. A control signal for dimmer control is also created here.

•IC2302 (TLVD823) This is an LVDS transmitter. It outputs a 24-bit RGB signal on ODD and EVEN, Hand V synchronized signals, and a DE signal, which are converted to an LVDS signal before being output.

•IC4602 (TLVD824) This is an LVDS receiver. An L VDS signal is converted to a 24-bit RGB signal on ODD and EVEN, H and V synchronized signals, and a DE signal, and then they are output.

•IC4101 (IXA706WJ) This is a gradated reference power supply for TFT liquid crystal. It incorporates a gradated output buffer amplifier (18 circuits), a CMOS buffer amplifier, and a reference voltage source.

•IC4701 (IXA332WJ) This is a QS driver for EVEN. The QS (Quick Shoot) is driven by the input signal according to the temperature parameter setting from the microcomputer monitor.Since the terminal function is the same as for IC4701 in LC-37AD1, refer to the LC-37AD1

service manual.

•IC4901 (IXA332WJ) This is a QS driver for ODD. The QS (Quick Shoot) is driven by the input signal according to the temperature parameter setting from the microcomputer monitor. The H and V synchronized signals and the DE signal are all output after QS is driven. Since the terminal function is the same as for IC4901 in LC-37AD1, refer to the

LC-37AD1 service manual.

・IC2302(TLVD823)

ThisisanLVDStransmitter.Itoutputsa24-bitRGBsignalonODDandEVEN,H andVsynchronizedsignals,andaDEsignal,whichareconvertedtoanLVDS signalbeforebeingoutput.

・IC4602(TLVD824)

+ 84 hidden pages

SHARP LC-32G4U, LC-32G4D, LC-37G4U, LC-37G4D. Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual