Sharp LC-19SK24U LC-19SB14U LCD TV Service Manual

In the interests of user-safety (Required by safety regulations in some countries) the set should be re- stored to its original condition and only parts identical to those speciﬁed should be used. MODEL This document has been published to be used for after sales service only. The contents are subject to change without notice. LCD COLOR TELEVISION CONTENTS ﾈ IMPORTANT SERVICE SAFETY PRECAUTION .......................................................................................... 2 ﾈ SPECIFICATIONS ......................................................................................................................................... 5 ﾈ OPERATION MANUAL .................................................................................................................................. 7 ﾈ DIMENSIONS .............................................................................................................................................. 11 ﾈ REMOVING OF MAJOR PARTS ................................................................................................................. 13 ﾈ ADJUSTING PROCEDURE OF EACH SECTION ...................................................................................... 18 ﾈ PUBLIC MODE SETTING PROCEDURE ................................................................................................... 43 ﾈ TROUBLESHOOTING TABLE ..................................................................................................................... 48 ﾈ MAJOR IC INFORMATIONS ....................................................................................................................... 56 ﾈ BLOCK DIAGRAM....................................................................................................................................... 58 ﾈ OVERALL WIRING DIAGRAM .................................................................................................................... 60 ﾈ DESCRIPTION OF SCHEMATIC DIAGRAM .............................................................................................. 62 ﾈ SCHEMATIC DIAGRAM RC/LED Unit .............................................................................................................................................. 63 MAIN Unit .................................................................................................................................................. 64 SUB Unit .................................................................................................................................................... 82 POWER_INVERTER Unit .......................................................................................................................... 86 KEY Unit .................................................................................................................................................... 88 ﾈ PRINTED WIRING BOARD ASSEMBLIES ................................................................................................. 89 ﾈ REPLACEMENT PARTS LIST................................................................................................................... 109 ﾈ PACKING OF THE SET ............................................................................................................................. 126 Page N87B1LC19K24U LC-19SK24U LC-19SK24U-W LC-19SB24U LC-19SB24U-W LC-19SB14U LC-19D44U

 LC-19SK4U/U-W LC-19SB4U/U-W LC-19SB14U LC-19D44U A V CAUTION: FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE REPLACE ONLY WITH SAME TYPE F7501 (5A, 250V) AND F7502 (2.5A, 250V) FUSE. 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 "!" IMPORTANT SERVICE SAFETY PRECAUTION Service work should be performed only by qualified service technicians who are thor- oughly familiar with all safety checks and the servicing guidelines which follow: 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 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. WARNING 1. For continued safety, no modification of any circuit should be attempted. 2. Disconnect AC power before servicing. 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, 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 TO EXPOSED METAL PARTS CONNECT TO KNOWN EARTH GROUND 0.15 µF TEST PROBE

 LC-19SK4U/U-W LC-19SB4U/U-W LC-19SB14U LC-19D44U PRECAUTION: POUR LA PROTECTION CONTINUE CONTRE LES RISQUES D'INCENDIE, REMPLACER LE FUSIBLE PAR UN FUSIBLE DE MEME TYPE F7501 (5A, 250V) et F7502 (2.5A, 250V). AVIS POUR LA SECURITE De nombreuses pièces, électriques et mécaniques, dans les téléviseurs 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 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 ou autres accidents. 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. AVANT DE RENDRE LE RECEPTEUR A L’UTI- LISATEUR (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: • Brancher le cordon d'alimentation directem-ent à une 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 1.5kΩ 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 (correspondante au courant CA de pointe de 0.5mA). Dans le cas contraire, il y a une possibilité de choc électrique qui doit être supprimée avant de rendre le récepteur au client. A V DVM AC SCALE 1.5k ohm 10W TO EXPOSED METAL PARTS CONNECT TO KNOWN EARTH GROUND 0.15 µF TEST PROBE

4 LC-19SK24U/U-W LC-19SB24U/U-W LC-19SB14U LC-19D44U 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: 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.  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. Indicates lead-free solder of tin, silver and copper. 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-19SK24U/U-W LC-19SB24U/U-W LC-19SB14U LC-19D44U SPECIFICATIONS *1 Emergency alert messages via Cable are unreceivable. *2 The dimensional drawings are shown on the inside back cover. • 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. LCD panel Item Model: LC-19SK24U/LC-19SK24U-W/LC-19SB24U/LC-19SB24U-W/LC-19SB14U 18.5o Active Matrix type a-Si TN LCD ( Screen size 18 1 / 2 o measured diagonally) 2W g 2 Number of dots TV Function TV-standard (CCIR) Receiving Channel VHF/UHF CATV(analog) Digital Terrestrial Broadcast (8VSB) Audio multiplex Audio out Terminals INPUT 1 INPUT 2 INPUT 3 INPUT 4 ANTENNA DIGITAL AUDIO OUTPUT OSD language Power Requirement Power Consumption Weight Dimension *2 (W g H g D) Operating temperature 3,147,264 dots (1366 g 768 g 3 dots) American TV Standard ATSC/NTSC System VHF 2-13ch, UHF 14-69ch 1-125ch (STD, HRC, IRC) 2-69ch BTSC System COMPONENT in AV in, S-VIDEO in HDMI in with HDCP(480P, 720P/60Hz, 1080I/60Hz, VGA), HDMI Analog Audio in 15 pin mini D-sub female connector, PC Audio in (Ø 3.5 mm jack) 75 q Unbalance, F Type g 1 for Analog (VHF/UHF/CATV) and Digital (AIR/CABLE) Optical Digital audio output g 1 (Dolby Digital) English/French/Spanish AC 120 V, 60 Hz e32°F to e104°F (0°C to e40°C) TV only TV + stand TV + stand TV only 45 W (0.5 W Standby with AC 120V) 11.4 lbs./5.2 kg 10.3 lbs./4.7 kg 18 3 / 16 g 12 19 / 32 g 2 61 / 64 inch 18 3 / 16 g 14 11 / 64 g 7 63 / 64 inch Digital Cable *1 (64/256 QAM) 1-135ch Headphone Ø 3.5 mm jack (Audio Output)

 LC-19SK24U/U-W LC-19SB24U/U-W LC-19SB14U LC-19D44U SPECIFICATIONS(Continued) *1 Emergency alert messages via Cable are unreceivable. *2 The dimensional drawings are shown on the inside back cover. • 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. LCD panel Item Model: LC-19D44U 18.5o Active Matrix type a-Si TN LCD ( Screen size 18 1 / 2 o measured diagonally) 2W g 2 Number of dots TV Function TV-standard (CCIR) Receiving Channel VHF/UHF CATV(analog) Digital Terrestrial Broadcast (8VSB) Audio multiplex Audio out Terminals INPUT 1 INPUT 2 INPUT 3 INPUT 4 ANTENNA DIGITAL AUDIO OUTPUT OSD language Power Requirement Power Consumption Weight Dimension *2 (W g H g D) Operating temperature 3,147,264 dots (1366 g 768 g 3 dots) American TV Standard ATSC/NTSC System VHF 2-13ch, UHF 14-69ch 1-125ch (STD, HRC, IRC) 2-69ch BTSC System COMPONENT in AV in, S-VIDEO in HDMI in with HDCP(480P, 720P/60Hz, 1080I/60Hz, VGA), HDMI Analog Audio in 15 pin mini D-sub female connector, PC Audio in (Ø 3.5 mm jack) 75 q Unbalance, F Type g 1 for Analog (VHF/UHF/CATV) and Digital (AIR/CABLE) Optical Digital audio output g 1 (Dolby Digital) English/French/Spanish AC 120 V, 60 Hz e32°F to e104°F (0°C to e40°C) TV only TV + stand TV + stand TV only 45 W (0.5 W Standby with AC 120V) 11.9 lbs./5.4 kg 10.1 lbs./4.5 kg 18 3 / 16 g 12 19 / 32 g 3 1 / 32 inch 18 3 / 16 g 14 11 / 64 g 7 63 / 64 inch Digital Cable *1 (64/256 QAM) 1-135ch Headphone Ø 3.5 mm jack (Audio Output)

 LC-19SK24U/U-W LC-19SB24U/U-W LC-19SB14U LC-19D44U OPERATION MANUAL Part names POWER button TV (Front) Channel buttons (CHr/s) Volume buttons ( VOLk/ l) INPUT button POWER indicator OPC sensor* Remote control sensor *OPC: Optical Picture Control OPC indicator TV (Side/Rear) INPUT 4 terminals (PC IN) INPUT 1 terminals DIGITAL AUDIO OUTPUT terminal Antenna/Cable in AC INPUT terminal INPUT 2 terminals MENU button INPUT 3 terminals (HDMI) HEADPHONE terminal Regarding the headphone jack • Use headphones with a stereo mini plug (Ø 3.5 mm). • Be sure to unplug headphones from the jack when they are not in use. • The speakers do not output volume when headphones are plugged in. • You can set the volume to different levels for each input source. Volume display when headphones are plugged in 20

 LC-19SK24U/U-W LC-19SB24U/U-W LC-19SB14U LC-19D44U 1 POWER: Switch the TV power on or enters standby. 2 DISPLAY: Display the channel information. 3 CC: Display captions from a closed-caption source. 4 0 – 9: Set the channel. 5 • (DOT) 6 FLASHBACK: Return to the previous channel or external input mode. 7 VIEW MODE: Select the screen size. 8 FREEZE: Set the still image. Press again to return to normal screen. 9 a/b/c/d/ENTER: Select a desired item on the screen. 10 EXIT: Turn off the menu screen. 11 FAVORITE CH A, B, C, D: Select 4 preset favorite channels in 4 different categories. While watching, you can toggle the selected channels by pressing A, B, C and D. 12 SLEEP: Set the sleep timer. 13 AV MODE: Select an audio or video setting. (When the input source is TV, INPUT 1 or 2: STANDARD, MOVIE, GAME, USER, DYNAMIC (Fixed), DYNAMIC. When the input source is INPUT 3: STANDARD, MOVIE, GAME, PC, USER, DYNAMIC (Fixed), DYNAMIC. When the input source is INPUT 4: STANDARD, PC, USER) 14 MUTE: Mute the sound. 15 AUDIO: Selects the MTS/SAP or the audio mode during multi-channel audio broadcasts. 16 VOL k/l: Set the volume. 17 CHr/s: Select the channel. 18 ENT: Jumps to a channel after selecting with the 0–9 buttons. 19 INPUT: Select a TV input source. (TV, INPUT 1, INPUT 2, INPUT 3, INPUT 4) 20 PC: Quickly access to PC mode. 21 MENU: Display the menu screen. 22 RETURN: Return to the previous menu screen. Remote control unit • When using the remote control unit, point it at the TV. Part names

9 LC-19SK24U/U-W LC-19SB24U/U-W LC-19SB14U LC-19D44U Kitchen Remote control unit (LC-19SK24U/LC-19SK24U-W/LC-19D44U) 1 KITCHEN TIMER/CLOCK SET/ALARM: Set the kitchen timer, clock or alarm. 2 MIN/HOUR : Set the minute of kitchen timer and the hour of clolck or alarm. 3 SEC/MIN : Set the second of kitchen timer and the minute of clock or alarm. 4 SET/STOP : Conﬁrm setting or stop beeper sound. 5 LIGHT : Light on the remote control LCD backlight. 6,7 CHr/CHs : Select the channel. 8 VOL+ : To increase the volume. 9 VOL- : To decrease the volume. 10 POWER : Switch the TV power on or enters standby. • The method of using the Kitchcen Remote control unit, please see page 50~52 of operation manual. Part names

10 LC-19SK24U/U-W LC-19SB24U/U-W LC-19SB14U LC-19D44U Menu items for TV/INPUT 1/2 Menu items for HDMI/PC-IN Treble Bass Balance Reset • Some menu items may not be displayed depending on the selected input source. OPC Backlight Contrast Brightness Color Tint Sharpness Advanced C.M.S Color Temp. Film Mode 3D-Y/C Monochrome I/P Setting Reset Treble Bass Balance Reset OPC Backlight Contrast Brightness Advanced C.M.S Color Temp. Monochrome Reset No Signal Off No Operation Off No Signal Off No Operation Off Power Management EZ Setup CH Setup Antenna Setup-DIGITAL Input Label Parental CTRL Position Rotate Language Reset Input Label Parental CTRL Position PC Setup HDMI Audio Select HDMI Auto View Rotate Language Reset Audio Only DNR Audio Only Digital Audio Color System Digital Caption Setup Favorite CH Basic adjustment settings

Sharp LC-19SK24U LC-19SB14U LCD TV Service Manual

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