Sharp LC-20S4U-S Service Manual And Parts Listparts List

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Operation manual (43 pages)

Service manual supplement (29 pages)

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Page 1: Table Of Contents
LC-20S4U-S SERVICE MANUAL S25F1LC20S4US LCD COLOR TELEVISION LC-20S4U-S 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.
Page 2: Important Service Safety Precaution
LC-20S4U-S IMPORTANT SERVICE SAFETY PRECAUTION Ë 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: • Use an AC voltmeter having with 5000 ohm per volt, or...
Page 3 LC-20S4U-S PRECAUTIONS A PRENDRE LORS DE LA REPARATION Ë Ne peut effectuer la réparation qu' un technicien spécialisé qui s'est parfaitement accoutumé à toute vérification de sécurité et aux conseils suivants. AVERTISSEMENT conduite électrique ou une prise de terre branchée à la terre.
Page 4 LC-20S4U-S 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.
Page 5: Specifications
15.2 lbs. (6.9 kg) w/o accessories ËAs a part of policy of continuous improvement, SHARP reserves the right to make design and specification changes for product improve- ment without prior notice. The performance specification figures indicated are nominal values of production units. There may be some...
Page 6: Operation Manual
LC-20S4U-S OPERATION MANUAL...
Page 7 LC-20S4U-S...
Page 8: Dimensions
LC-20S4U-S DIMENSIONS Unit: inch (mm) (117) (310) (135) (483) (53.4) (94) (403.3) (148) (100) (224)
Page 9: Removing Of Major Parts
LC-20S4U-S REMOVING OF MAJOR PARTS 1. Remove the stand cover fixing screws (1 pc.) 2. Remove the stand fixing screws (4 pcs.). 3. Remove the carrying handle fixing screws (4 pcs.). 4. Remove the terminal covers (left and right). 5. Remove the terminal screws (6 pcs.).
Page 10 LC-20S4U-S 10. Remove the 2 lock screws from the main PWB, and undo the claws a and b. Detach the main PWB by lifting the area around the claws and pulling the PWB out. 11. Remove the 3 lock screws from the analog PWB, and undo the claws c and d. Detach the chassis frame (right) from the analog PWB by pulling out the terminals.
Page 11 LC-20S4U-S » Precautions in handling the LCD panels 1. Work in a clean room (with humidities below 50%). 2. Be sure to wear an anti-static armband. 3. Handle the panels on an electro-conductive mat. 4. Be careful not to fall, shake and shock the panels.
Page 12 LC-20S4U-S »Precautions in servicing the B side (backside) of the main PWB unit 1. Disconnect the FFC from between the main PWB (SC1202) and LCD panel unit (CN1), and then connect the service-specific extension FFC (flat cable) (QCNW-A553WJZZ). 2. Disconnect the FFC from between the main PWB (SC1201) and LCD panel unit (CN2), and then connect the service-specific extension cord (QCNW-A556WJZZ).
Page 13: Adjusting Procedure Of Each Section
LC-20S4U-S ADJUSTING PROCEDURE OF EACH SECTION The products have been factory-adjusted to the best settings. If any of them gets out of point or readjustment is needed due to a part replacement, take the following adjustment procedures. 1. Pre-adjustment preparations Keep the AC power cable directly plugged in a wall outlet.
Page 14 LC-20S4U-S 5. Take the following procedure when IC2009 (EEPROM) has been initialized or IC2001 (microprocessor) replaced. 5-1. Connect pins (81) and (82) of IC2001 (microprocessor) to GND, and turn on the power. 5-2. Make sure "20" (inches) is selected for the screen size.
Page 15: Factory Settings
LC-20S4U-S 6-3. White balance adjustment 1) Adjustment procedure Adjustment process menu page 3: RGB CUTOFF2, RGB-GAIN Feed the 40% white signal. Move the R- CUTOFF2 and B-CUTOFF2 settings within ±30 to adjust the white balance. Next feed the 80% white signal.
Page 16 LC-20S4U-S 7-2. Description of Factory Settings. Setting content/range Initial Value (AV1) (AV2) (COMPONENT1) MENU PICTURE AV MODE STANDARD/DYNAMIC/DYNAMIC(FIXED)/MOVIE/GAME DYNAMIC DYNAMIC DYNAMIC DYNAMIC ON/OFF BACKLIGHT BRIGHT/NORMAL/DARK/VARIABLE VARIABLE (STANDARD) (DYNAMIC) (DYNAMIC(FIXED) (MOVIE) (GAME) 1 (DARK) ~9 (NORMAL)~17 (BRIGHT) CONTRAST 0~60 BRIGHTNESS -30~+30...
Page 17 LC-20S4U-S 8. Lamp error detection 8-1. Functional description This LCD colour television has a function (lamp error detection) to be turned off automatically for safety when the lamp or lamp circuit is abnormal. If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is executed, the followings occur.
Page 18 LC-20S4U-S LIST OF THE ADJUSTMENT PROCESS MODE MENU " For calling the adjustment process mode and keying in this mode, refer back to ADJUSTING PROCEDURE OF " EACH SECTION ADJUSTMENT PROCESS 1st LEVEL ITEM DEFAULT TABLE Initial Response precautions on servicing Page No.
Page 19 TINT SETTING (TV) NOT USED N358 AV TINT TINT SETTING (COMPOSITE, S VIDEO) NOT USED N358 TV SHARP V V PICTURE QUALITY SETTING (TV) NOT USED N358 AV SHARP V V PICTURE QUALITY SETTING (COMPOSITE, S VIDEO) NOT USED N358 TV SHARP H1...
Page 20 COLOR DENSITY SETTING (COMPOSITE, S VIDEO) NOT USED N443 AV TINT TINT SETTING (COMPOSITE, S VIDEO) NOT USED N443 AV SHARP V V PICTURE QUALITY SETTING (COMPOSITE, S VIDEO) NOT USED N443 AV SHARP H1 H PICTURE QUALITY SETTING 1 (COMPOSITE, S VIDEO) NOT USED...
Page 21 TINT SETTING (TV) NOT USED PAL-N AV TINT TINT SETTING (COMPOSITE, S VIDEO) NOT USED PAL-N TV SHARP V V PICTURE QUALITY SETTING (TV) NOT USED PAL-N AV SHARP V V PICTURE QUALITY SETTING (COMPOSITE, S VIDEO) NOT USED PAL-N TV SHARP H1...
Page 22 1125I COLOR COLOR DENSITY SETTING (TV) NOT USED 1125I TINT TINT SETTING (TV) NOT USED 1125I SHARP V V PICTURE QUALITY SETTING (TV) NOT USED 1125I SHARP H1 H PICTURE QUALITY SETTING 1 (TV) NOT USED 1125I SHARP H2 H PICTURE QUALITY SETTING 2 (TV) NOT USED...
Page 23: Public Mode Setting Procedure
LC-20S4U-S PUBLIC MODE SETTING PROCEDURE 1. How to start Public Mode » There are the following two ways to get the public mode setup screen displayed. 1 1) Press the "INPUT" and "VOL (+)" keys on the set at once and turn on the power.
Page 24 LC-20S4U-S 2. How to exit Public Mode There are the following ways to quit the public mode setup screen. » Turn off "PUBLIC MODE" in the adjustment process mode. ( ) ← This way alone is not for quitting the setup screen, but for quitting the mode itself.
Page 25 LC-20S4U-S 5. On Setting Items * "EZ-SETUP" discussed below indicates "EZ-SETUP after the first power-on". (1) POWER ON FIXED " " " " Selection Selection between Variable Fixed (loop provided) Default – (Variable) " " Explanation Fixed setting, the power-off by the power key of the unit is invalidated and the image is kept being received.
Page 26 LC-20S4U-S (4) VOLUME FIXED LEVEL Selection Adjustment from 1 to 60 (no loop) Default " " Explanation The sound volume to be fixed by Volume fixed is determined. Limit in Setting None Exception None " " " " Remarks Setting is valid only when...
Page 27 LC-20S4U-S (8) ON SCREEN DISPLAY " " " " Selection Selection between Limited (loop provide) Default Explanation The following OSD displays are made ineffective. Displays of menu group, channel call, sound volume bar and direct key call " " Limit in Setting »...
Page 28: Trouble Shooting Table
LC-20S4U-S TROUBLE SHOOTING TABLE...
Page 29 LC-20S4U-S TROUBLE SHOOTING TABLE (Continued)
Page 30 LC-20S4U-S TROUBLE SHOOTING TABLE (Continued)
Page 31 LC-20S4U-S TROUBLE SHOOTING TABLE (Continued)
Page 32: Major Ic Informations
LC-20S4U-S MAJOR IC INFORMATIONS 1-1. Description of Pins of IC2001 (RH-iXA627WJN5Q) Pin No. Pin Name Pin Name Function TB1in CSYNC Composite sync signal TB0in IREM1 Remote control signal BYTE BYTE Connected to GND CNVss CNVss Connected to GND (connected to Vcc1 for CNVSS at flash write)
Page 33 LC-20S4U-S Pin No. Pin Name Pin Name Function HPMUTE Headphones mute SP MUTE1 Main speaker mute HP DET Headphones detect SSTBY Amplifier power control VSH IN Panel gate driver voltage confirm LMUTE Line out audio mute V IN/OUT Video input/output select...
Page 34: Block Diagram
LC-20S4U-S BLOCK DIAGRAM LED_UNIT AUDIO_POWER_AMP HP (Front) IC3301 SOUND_PROCESSOR Jack IC3201 3.5ø (STEREO) TUNER_PWB DACA_OUT SP_MUTE DACM_OUT SLEEP (S_STBY) SIF AMP ANA_IN1 SP 2 ANA_IN2 SC1_IN I2C (3.3V) SCL/SDA SC2_IN SC2_OUT SC3_IN SC4_IN SC1_OUT AUDIO IN/OUT SWITCH IC3401 IN/OUT S IN/OUT I2C (3.3V)
Page 35 LC-20S4U-S LCD_Panel MAIN_PWB LCD PANEL RED,GREEN,BLUE CK,SP CVBS1-in 40 Y-in 42 T-CON C-in 31 VIDEO /PANEL PROCESSOR DVP-ML D-Y-in 44 IC801 Pb-in 33 Pr-in 21 H OUT V OUT GRADIATION ICIC1101 MPWEH, MPWEL, MPOE, MPCE, TSTCLK VSYNC CSYN C MPCLK ,MPRDA, MPRCS...
Page 36: Overall Wiring Diagram
LC-20S4U-S OVERALL WIRING DIAGRAM LCD PANEL RLCDTA025WJZZ (QCNW-D016WJQZ) (QCNW-D014WJQZ) SC1202 N0684FJ YOBI10 YOBI9 YOBI8 YOBI7 YOBI6 YOBI5 YOBI4 YOBI3 YOBI2 MAIN YOBI1 DUNTKC847DE09 (QPWBXC847WJN4) GSP1 VSH3.3V VSH3.3V GLBR POWER GSP2 CSCOM CSCOM Board to Board (QCNW-D017WJQZ) TUNER DUNTKD084WE03 (QPWBND084WJN1) (QCNW-C989WJQZ)
Page 37 LC-20S4U-S WJQZ) POWER TV/VIDEO MENU VOL + VOL - INV+B INV+B INV+B INV+B INV+B INVERTER UNIT OPERATION UNIT RUNTKA124WJZZ OFL1 DUNTKD086WE03 INV_OSC (QPWBFD086WJN1) INV_POW L_ERR MA012WJ Z1538CE SC4051 DC JACK Board to Board Board to Board LAMP KLMP-A046WJZZ SP_R...
Page 38: Description Of Schematic Diagram
LC-20S4U-S DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: 1. The voltages at test points are measured on exclusive AC adaptor and the stable supply voltage of AC 110-240V. Signals are fed by a color bar signal generator for servicing purpose and the above voltages are measured with a 20k ohm/V tester.
Page 39: Schematic Diagram
LC-20S4U-S SCHEMATIC DIAGRAM Ë OPERATION Unit...
Page 40 LC-20S4U-S Ë MAIN Unit-1/5...
Page 41 LC-20S4U-S...
Page 42 LC-20S4U-S Ë MAIN Unit-2/5...
Page 43 LC-20S4U-S...
Page 44 LC-20S4U-S Ë MAIN Unit-3/5...
Page 45 LC-20S4U-S...
Page 46 LC-20S4U-S Ë MAIN Unit-4/5...
Page 47 LC-20S4U-S...
Page 48 LC-20S4U-S Ë MAIN Unit-5/5...
Page 49 LC-20S4U-S...
Page 50 LC-20S4U-S Ë ANALOG Unit-1/4...
Page 51 LC-20S4U-S...
Page 52 LC-20S4U-S Ë ANALOG Unit-2/4...
Page 53 LC-20S4U-S...
Page 54 LC-20S4U-S Ë ANALOG Unit-3/4...
Page 55 LC-20S4U-S...
Page 56 LC-20S4U-S Ë ANALOG Unit-4/4...
Page 57 LC-20S4U-S...
Page 58 LC-20S4U-S Ë R/C, LED Unit...
Page 59: Printed Wiring Board Assemblies
LC-20S4U-S PRINTED WIRING BOARD ASSEMBLIES OPERATION Unit (Wiring Side) R/C, LED Unit (Side-A) (QPWBND085WJN1) D4004 P4001 D4005 D4006 R4000 IC4000 RMC4000 D4001 J4000 R4001 D4000 C4001 D4002 C4003 C4000 Q4002 R/C, LED Unit (Chip Parts Side-A) (QPWBND085WJN1)
Page 60 LC-20S4U-S MAIN Unit (Side-A)
Page 61 LC-20S4U-S...
Page 62 LC-20S4U-S SC1201 SC1203 R1205 R1203 R1201 C1107 R1206 R1204 R1202 FDC1 IC1101 C849 C848 C1104 R205 C874 C852 C838 C853 R205 C854 C837 R808 R883 C836 R882 R809 R810 L801 IC801 R811 C865 C866 C855 C857 C834 C833 R2066 R2059...
Page 63 LC-20S4U-S R1722 C1713 LUG2053 L703 FB702 C1702 C1714 L1701 L1703 Q1705 L706 C2005 C2009 D2007 R757 C2008 X2001 D704 R756 R2058 FL2001 R2042 C2016 R2056 R755 C743 C2014 C2013 Q715 R2008 R2010 C2010 R2066 R2059 IC2001 R2018 R2017 C2012 R2065...
Page 64 LC-20S4U-S MAIN Unit (Side-B)
Page 65 LC-20S4U-S...
Page 66 LC-20S4U-S R 7 0 5 R 7 2 5 R 7 3 3 R 7 2 2 R 7 4 6 D 1 7 0 3 Q 1 7 0 3 R 1 1 0 7 C 7 0 6...
Page 67 LC-20S4U-S T L 1 2 8 5 T L 1 2 6 4 T L 1 2 6 8 T L 1 2 7 2 T L 1 2 7 9 T L 1 2 7 7 T L 1 2 0 2...
Page 68 LC-20S4U-S ANALOG Unit (Side-A)
Page 69 LC-20S4U-S...
Page 70 LC-20S4U-S R3703 FB3701 P3702 SC3401 D3412 D3411 C3495 L3406 C3497 R3430 C3419 R3538 C3416 D3409 D3410 C3417 C3501 R3540 L3408 C3418 C3426 R3425 C3500 R3458 C3498 R3428 L3407 Q3409 R3539 C3499 R3442 R3462 C3442 R3461 R3463 C3433 D3403 D3404 R3450...
Page 71 LC-20S4U-S R3703 FB3701 P3701 R3730 C3706 Q3706 R3715 R3714 R3716 C3707 C3708 Q3705 C3714 R3709 R3729 R3725 IC3702 R3728 D3704 R3707 R3704 R3705 SLD7003 C7006 FB7007 R7012 C7014 IC7002 FB7005 R7024 C7012 C3502 Q7002 FB7006 R7009 C7025 C7032 C7027 L7007...
Page 72: Replacement Parts List
2. NO. DE REF 3. NO. DE PIECE 4. DESCRIPTION in USA: Contact your nearest SHARP Parts Distributor to order. For in CANADA: Contact SHARP Electronics of Canada Limited location of SHARP Parts Distributor, Please call Toll-Free; Phone (416) 890-2100...
Page 73 LC-20S4U-S Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKC847FE09 C807 VCKYCY1CB104KY J 0.1 Ceramic C808 VCKYCZ1AB104KY J 0.1 Ceramic MAIN Unit (Continued) C809 VCKYCZ1AB104KY J 0.1 Ceramic C810 VCKYCZ1AB104KY J 0.1 Ceramic D702 VHDRB051L40-1Y J Diode C811 VCKYCY1CB104KY J 0.1...
Page 74 LC-20S4U-S Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKC847FE09 R752 VRS-CY1JF511JY J 510 1/16W Metal Oxide R754 VRS-CY1JF303JY J 30k 1/16W Metal Oxide MAIN Unit (Continued) R755 VRS-TW2HF272JY J 2.7k 1/2W Metal Oxide R756 VRS-TW2HF272JY J 2.7k 1/2W...
Page 75 LC-20S4U-S Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKC847FE09 R2064 VRS-CY1JF101JY J 100 1/16W Metal Oxide R2065 VRS-CY1JF101JY J 100 1/16W Metal Oxide MAIN Unit (Continued) R2066 VRS-CY1JF101JY J 100 1/16W Metal Oxide R2068 VRS-CY1JF101JY...
Page 76 LC-20S4U-S Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD084WE03 L7006 VP-1M220J2R9NY J Peaking 22µH L7007 VP-1M220J2R9NY J Peaking 22µH ANALOG Unit L7008 VP-1M5R6J1R2NY J Peaking 5.6µH L7009 VP-1M100J1R6NY J Peaking 10µH TUNER L7010 VP-1M100J1R6NY J Peaking 10µH...
Page 77 LC-20S4U-S Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD084WE03 R3305 VRS-CY1JF222JY J 2.2k 1/16W Metal Oxide R3306 VRS-CY1JF000JY 1/16W Metal Oxide ANALOG Unit (Continued) R3307 VRS-CY1JF000JY 1/16W Metal Oxide R3308 VRS-CY1JF123JY J 12k 1/16W Metal Oxide R3310 VRS-CY1JF392JY J 3.9k 1/16W Metal Oxide...
Page 78 LC-20S4U-S Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD084WE03 DUNTKD085WE03 ANALOG Unit (Continued) R/C, LED Unit INTEGRATED CIRCUITS R3706 VRS-CY1JF184JY J 180k 1/16W Metal Oxide IC4000 VHiMM1616++-1Y J MM1616XBRE R3707 VRS-CY1JF103JY J 10k 1/16W Metal Oxide...
Page 79: Operation Unit
LC-20S4U-S Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD086FM03 OPERATION Unit DIODES D4050 RH-EX0640GEZZY J Zener Diode, 12V D4051 RH-EX0652GEZZY J Zener Diode, 18V D4052 RH-EX0640GEZZY J Zener Diode, 12V RESISTORS R4050 VRD-RA2BE682JY J 6.8k 1/8W...
Page 80: Cabinet And Mechanical Parts
LC-20S4U-S Ref. No. Part No. Description Code Ref. No. Part No. Description Code XBBS740P08000 J Screw, x3 CABINET AND MECHANICAL PARTS XBBS930P05000 J Screw, x3 XBBS940P08000 J Screw, x1 XBBS940P25000 J Screw, x4 CCABAA847WJ01 X Cabinet A Ass’y XBPS730P10JS0 J Screw, x10 Not Available –...
Page 81 LC-20S4U-S CABINET AND MECHANICAL PARTS 4-2-4 1-10 4-2-4 R/C, LED PWB 4-2-1 4-2-7 4-2-2 4-2-5 4-11 4-2-3 2-11 4-10 2-10 Operation PWB Main PWB Inverter PWB Analog PWB...
Page 82: Packing Parts
LC-20S4U-S Ref. No. Part No. Description Code Ref. No. Part No. Description Code PACKING PARTS SUPPLIED ACCESORIES (NOT REPLACEMENT ITEM) LHLDWA002WJSA J Cable Clamp SPAKCB853WJZZ – Packing Case — QACCDA037WJPA J AC Cord SPAKFA791WJZZ – Packing Case, for — å...
Page 83: Packing Of The Set
LC-20S4U-S PACKING OF THE SET S2/S3...
Page 84 LC-20S4U-S COPYRIGHT © 2005 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

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