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Sharp LC-20S5U Service Manual
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Sharp LC-20S5U Service Manual

Sharp LC-20S5U Service Manual

Lcd color television
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Download this manual See also: Operating Manual
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.
» IMPORTANT SERVICE SAFETY PRECAUTION .........................................................................................2
» SPECIFICATIONS ........................................................................................................................................5
» OPERATION MANUAL .................................................................................................................................6
» DIMENSIONS ...............................................................................................................................................8
» REMOVING OF MAJOR PARTS ..................................................................................................................9
» ADJUSTING PROCEDURE OF EACH SECTION ..................................................................................... 13
» PUBLIC MODE SETTING PROCEDURE ..................................................................................................25
» TROUBLE SHOOTING TABLE ..................................................................................................................30
» MAJOR IC INFORMATIONS ...................................................................................................................... 34
» BLOCK DIAGRAM ......................................................................................................................................36
» OVERALL WIRING DIAGRAM ...................................................................................................................38
» DESCRIPTION OF SCHEMATIC DIAGRAM ............................................................................................. 40
ËINVERTER Unit .......................................................................................................................................41
ËMAIN Unit .................................................................................................................................................42
ËSUB Unit ..................................................................................................................................................58
ËR/C, LED Unit ..........................................................................................................................................70
» PRINTED WIRING BOARD ASSEMBLIES ................................................................................................71
» REPLACEMENT PARTS LIST.................................................................................................................... 86
» PACKING OF THE SET ..............................................................................................................................99
LCD COLOR TELEVISION
LC-20S5U
MODEL
CONTENTS
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
LC-20S5U
S26R7LC20S5U/
Page

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  • Page 1: Table Of Contents

    LC-20S5U S26R7LC20S5U/ LCD COLOR TELEVISION LC-20S5U 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. CONTENTS Page »...

  • Page 2: Important Service Safety Precaution

    LC-20S5U 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-20S5U PRECAUTIONS A PRENDRE LORS DE LA REPARATION Ë 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 exposées du coffret et une terre connue comme une conduite électrique ou une prise de terre branchée à...
  • Page 4 LC-20S5U 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

    Ë As a part of policy of continuous improvement, SHARP reserves the right to make design and specification changes for the LCD TV set improvement without prior notice. The performance specification figures indicated are nominal values of production units. There may be...

  • Page 6: Operation Manual

    LC-20S5U OPERATION MANUAL...
  • Page 7 LC-20S5U...

  • Page 8: Dimensions

    LC-20S5U DIMENSIONS Unit: inch (mm) (142.4) (379.7) (482.9) (61.9) (101.1) (403.1) (241.6) (100)

  • Page 9: Removing Of Major Parts

    LC-20S5U REMOVING OF MAJOR PARTS 1. Remove the stand cover fixing screw (1 pc.). 2. Remove the stand fixing screws (4 pcs.). 3. Remove the carrying handle fixing screws (4 pcs.). 4. Remove the terminal cover. 5. Remove the terminal screws (2 pcs.).
  • Page 10 LC-20S5U 9. Remove the chassis frame fixing screws (2 pcs.). 10. Remove the 2 lock screws from the main PWB. Detach the chassis frame, together with its terminals, from the main PWB. 11. Remove the 5 lock screws from the sub PWB and the PWB fixing angle. Detach the chassis frame together with its terminals, from the sub PWB.
  • Page 11 LC-20S5U » Precautions in handling the LCD panel 1. Handle it in a clean room. (above 50% humidity) 2. The worker must wear an earth band. 3. Be careful not to drop, vibrate and shock the panel. 4. Use an ionizer. (within 30 cm) 15.
  • Page 12 LC-20S5U »Precautions in servicing the side-B (backside) of the main PWB unit 1. Remove the lock screws (2 pcs.) from the main PWB, detach the PWB from the chassis frame, and then turn it over. 2. Connect the service-specific extension cable (QCNW-E540WJQZ) between the main PWB (SC5201) and the sub PWB (P5002).

  • Page 13: Adjusting Procedure Of Each Section

    LC-20S5U ADJUSTING PROCEDURE OF EACH SECTION The best adjustment is made before shipping. If any position deviation is found or after part replacement is performed, adjust as follows. 1. Preparations (1) Plug the AC power cord directly into a wall outlet.
  • Page 14 LC-20S5U 3-2. ADC target level adjustment * Using the UP/DOWN keys, enter RGTAR, GGTAR, BGTAR of Service Menu Page 7 * Press CH12 of remote control, enter adjustment situation "A3 A3 A3" * Using the LEFT/RIGHT keys, make the first A3 correspond to RGTAR, the second A3 correspond GGTAR, and the third A3 correspond BGTAR * It is not adjusted usually.
  • Page 15 LC-20S5U 6-3. TAMP adjustment 1) Receive the standard color bar signal. 2) See if the "Y" reading (maximum) on Adjustment Process Page 2 is within the range in the following table. If not, adjust the "NTSC TAMP" setting on the same page to have the "Y" reading (maximum) within this range.
  • Page 16 LC-20S5U [7] Factory settings 7-1. Making factory settings Use the adjustment remote controller for the factory settings. 1) Hold down the remote controller's FACTORY SETTING key. 2) Several seconds later, "SETTING COMPLETE" appears at the center of the screen. Now the settings are complete.
  • Page 17 LC-20S5U 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 BRIGHT (STANDARD) (DYNAMIC) (DYNAMIC(FIXED) (MOVIE) (GAME) 1 (DARK) ~9 (NORMAL)~17 (BRIGHT) CONTRAST 0~60 BRIGHTNESS -30~+30...
  • Page 18 LC-20S5U 8. Lamp error detection 8-1. Functional description This LCD color 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 19 LC-20S5U 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 20 LC-20S5U AUDIO ADJUSTMENT PROCESS SPECIFICATIONS Initial Response precautions on servicing Page No. Item Function Value (Do not change other items than designated.) AUDIO ADJUSTMENT NOT USED SOUND1 VOLUME SOUND VOLUME AUDIO IC MSP DATA WRITE AND READ NOT USED MSP DATA...
  • Page 21 TINT SETTING (TV) Change to 121 N358 AV TINT TINT SETTING (COMPOSITE, S VIDEO) Change to 117 N358 TV SHARP V V PICTURE QUALITY SETTING (TV) NOT USED N358 AV SHARP V V PICTURE QUALITY SETTING (COMPOSITE, S VIDEO) NOT USED...
  • Page 22 TINT SETTING (TV) Change to 130 PAL-M AV TINT TINT SETTING (COMPOSITE, S VIDEO) Change to 127 PAL-M TV SHARP V V PICTURE QUALITY SETTING (TV) NOT USED PAL-M AV SHARP V V PICTURE QUALITY SETTING (COMPOSITE, S VIDEO) NOT USED...
  • Page 23 COLOR DENSITY SETTING (COMPOSITE, S VIDEO) Change to 75 750P 60 TINT TINT SETTING (COMPOSITE, S VIDEO) Change to 128 750P 60 SHARP V V PICTURE QUALITY SETTING (TV) NOT USED 750P 60 SHARP H1 H PICTURE QUALITY SETTING 1 (TV) NOT USED...
  • Page 24 LC-20S5U ADJUSTMENT PROCESS TUNER ITEM DEFAULT TABLE Initial Response precautions on servicing Page No. Item Function Value (Do not change other items than designated.) TUNER SETTINGS TUNER1 AFT UP 1.80 AFT VOLTAGE REFERENCE LEVEL (ALL BANDS) NOT USED AFT DOWN 1.20...

  • Page 25: Public Mode Setting Procedure

    LC-20S5U 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 In the adjustment process mode, turn on "PUBLIC MODE". Also press the "CH (ù)" and "VOL (+)" keys on the set at once and turn on the power.
  • Page 26 LC-20S5U 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 27 LC-20S5U 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 28 LC-20S5U (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 29 LC-20S5U (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 30: Trouble Shooting Table

    LC-20S5U TROUBLE SHOOTING TABLE...
  • Page 31 LC-20S5U TROUBLE SHOOTING TABLE (Continued)
  • Page 32 LC-20S5U TROUBLE SHOOTING TABLE (Continued)
  • Page 33 LC-20S5U TROUBLE SHOOTING TABLE (Continued)

  • Page 34: Major Ic Informations

    LC-20S5U MAJOR IC INFORMATIONS 1-1. Description of Pins of IC2001 (RH-iXA634WJN1Q or RH-iXA634WJZZQ) Pin No. Pin Name Pin Name Function AD_INT AD IC initial output OFL_DUTY PC_H D_FIL PC_V TB1in CSYNC Composite sync signal TB0in IREM1 Remote control signal BYTE...
  • Page 35 LC-20S5U Pin No. Pin Name Pin Name Function F_SEL0 HP_MUTE SP_MUTE1 Main speaker mute F_SEL1 HP DET Headphones detect SSTBY Amplifier power control VSH_IN Panel gate driver voltage confirm L MUTE Line out audio mute V_IN/OUT Video input/output select SRESET...

  • Page 36: Block Diagram

    LC-20S5U BLOCK DIAGRAM HP_AMP IC1303 LED_PWB LCD_Panel AUDIO_POWER_AMP HP (Front) SOUND_PROCESSOR Jack IC3301 MAIN_PWB 3.5φ (STEREO) IC1301 SUB_PWB LCD PANEL RED,GREEN,BLUE DACA_OUT RSDS SLEEP DACM_OUT SP_MUTE CK, SP CVBS1-in 40 (S_STBY) TRANSMITTER SIF AMP ANA_IN1 Y-in 42 SP x2 ANA_IN2...

  • Page 37: Overall Wiring Diagram

    LC-20S5U OVERALL WIRING DIAGRAM R1LQ197V3GZ83 Board to Board Board to Board Board to Board...

  • Page 38: Description Of Schematic Diagram

    LC-20S5U DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: 1. The voltages at test points are measured on the stable supply voltage of AC 120V. 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 Ëinverter Unit

    LC-20S5U SCHEMATIC DIAGRAM Ë INVERTER Unit...

  • Page 40: Ëmain Unit

    LC-20S5U ËMAIN Unit-1/9...
  • Page 41 LC-20S5U ËMAIN Unit-2/9...
  • Page 42 LC-20S5U ËMAIN Unit-3/9...
  • Page 43 LC-20S5U ËMAIN Unit-4/9...
  • Page 44 LC-20S5U ËMAIN Unit-5/9...
  • Page 45 LC-20S5U ËMAIN Unit-6/9...
  • Page 46 LC-20S5U ËMAIN Unit-7/9 Note: MAIN 8 does not use it.
  • Page 47 LC-20S5U ËMAIN Unit-9/9...

  • Page 48: Ësub Unit

    LC-20S5U ËSUB Unit-1/6...
  • Page 49 LC-20S5U ËSUB Unit-2/6...
  • Page 50 LC-20S5U ËSUB Unit-3/6...
  • Page 51 LC-20S5U ËSUB Unit-4/6...
  • Page 52 LC-20S5U ËSUB Unit-5/6...
  • Page 53 LC-20S5U ËSUB Unit-6/6...

  • Page 54: Ër/C, Led Unit

    LC-20S5U Ë R/C, LED Unit...

  • Page 55: Printed Wiring Board Assemblies

    LC-20S5U PRINTED WIRING BOARD ASSEMBLIES R/C, LED Unit (Component Side) (QPWBSD676WJZZ) C4006 Q4000 Q4001 D4006 D4005 R4000 R4002 IC4000 RMC4000 D4000 D4001 J4000 R4001 R4003 SC4000 C4001 FB4001 D4002 Q4002 R4010 C4003 C4000 R/C, LED Unit (Chip Parts Side) (QPWBSD676WJZZ)
  • Page 56 LC-20S5U MAIN Unit (Side-A)
  • Page 57 LC-20S5U R2021 Q713 R769 C2027 R2017 R768 C2006 IC2011 C752 L701 FB707 P2002 LUG2001 LUG2002 Q705 R2060 X1301 R770 R773 D706 R771 R772 C753 D2008 R775 Q2023 R2028 IC706 L706 R776 R2096 R2095 R2016 R774 R2009 R2106 R2019 L702 C2016...
  • Page 58 LC-20S5U MAIN Unit (Side-B)
  • Page 59 LC-20S5U R737 C721 R750 TL2077 TL2006 TL2004 C1303 C1302 R2012 TL2081 TL2005 Q701 TL2080 TL2084 TL2085 TL2072 TL2003 TL2001 TL2002 C728 IC2003 D2002 FB1301 TL2074 R1301 C1307 C1309 C1304 TL2073 TL2096 R752 R2006 R2036 TL2088 L1301 Q702 TL2128 R1302 C2022...
  • Page 60 LC-20S5U SUB Unit (Wiring Side) (QPWBFD674WJN1)
  • Page 61 LC-20S5U TL4051 TL4052 TL4056 TL4057 TL4054 TL4053 D6703 R3421 R3417 TL7734 R4053 R4056 TL4055 TL7740 TL4058 R3445 C3416 TL5069 R6743 TL5067 R5010 L3406 TL7738 TL5019 Q3405 TL5058 TL5109 Q5001 R3538 TL5068 TL5122 TL5121 TL5119 R3475 C3497 TL5118 TL5107 R7710 Q7703...
  • Page 62 LC-20S5U INVERTER Unit (Component Side) INVERTER Unit (Wiring Side) TL6716 TL6717 TL6708 TL6709 TL6710 TL6711 TL6712 TL6713 TL6714 TL6715 TL6720 TL6029 TL6028 TL6031 TL6030 TL6032 R6710 C6725 C6726 TL6722 R6711 TL6721 R6729 TL6718 R6730 C6727 Q6716 TL6021 TL6719 C6718 TL6027...

  • Page 63: 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 64 LC-20S5U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD673FMF0 C1273 VCKYCY1EF104ZY J 0.1 Ceramic C1274 RC-KZA176WJZZY J 10 Ceramic MAIN Unit (Continued) C1277 VCKYCY1EF104ZY J 0.1 Ceramic C1278 RC-KZA109WJZZY J 10 Ceramic C1301 VCEASX0JN107MY J 100 6.3V Electrolytic...
  • Page 65 LC-20S5U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD673FMF0 D8701 VHDBAS316//-1Y J Diode MAIN Unit (Continued) MISCELLANEOUS PARTS FB401 RBLN-0060TAZZY J Ferrite Bead C2016 VCCCCY1HH100DY J 10p Ceramic FB402 RBLN-0060TAZZY J Ferrite Bead C2017 VCCCCY1HH100DY J 10p...
  • Page 66 LC-20S5U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD673FMF0 R707 VRS-CY1JF104DY J 100k 1/16W Metal Oxide R708 VRS-CY1JF104DY J 100k 1/16W Metal Oxide MAIN Unit (Continued) R713 VRS-CY1JF223JY J 22k 1/16W Metal Oxide R714 VRS-CY1JF223JY...
  • Page 67 LC-20S5U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD673FMF0 R2012 VRS-CY1JF103FY J 10k 1/16W Metal Oxide R2013 VRS-CJ1JF101JY J 100 1/16W Metal Oxide MAIN Unit (Continued) R2015 VRS-CY1JF101JY J 100 1/16W Metal Oxide R2016 VRS-CY1JF473FY...
  • Page 68 LC-20S5U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD673FMF0 DUNTKD674FMF0 MAIN Unit (Continued) SUB Unit CAPACITORS R8729 VRS-CY1JF121JY J 120 1/16W Metal Oxide R8730 VRS-CY1JF000JY 1/16W Metal Oxide C3301 VCESYA1CM107M+ J 100 Electrolytic R8731 VRS-CY1JF103JY...
  • Page 69 LC-20S5U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD674FMF0 HM7730 LX-GZ3002PEZZ J Screw HM7731 LX-GZ3002PEZZ J Screw SUB Unit (Continued) HM7732 LX-GZ3002PEZZ J Screw HM7733 LX-GZ3002PEZZ J Screw HM7735 LX-GZ3002PEZZ J Screw C7759 RC-KZ0103GEZZ J 1000p 250V Ceramic å...
  • Page 70 LC-20S5U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD674FMF0 R4055 VRS-CY1JF274JY J 270k 1/16W Metal Oxide R4056 VRS-CY1JF823JY J 82k 1/16W Metal Oxide SUB Unit (Continued) R5001 VRD-RM2HD101JY J 100 1/2W Carbon R5003 VRS-CY1JF000JY 1/16W Metal Oxide...

  • Page 71: Inverter Unit

    LC-20S5U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD674FMF0 DUNTKD675FMF0 SUB Unit (Continued) INVERTER Unit CAPACITORS S4057 QSW-K0095CEZZ J POWER C6700 RC-FZA031WJZZ J 0.068 250V Film SPARK GAP C6703 VCKYCY1EB104KY J 0.1 Ceramic SG7703 QSPGCA003WJZZ J Spark Gap...
  • Page 72 LC-20S5U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD675FMF0 R6744 VRS-TW2ED561JY J 560 1/4W Metal Oxide R6745 VRS-TW2ED561JY J 560 1/4W Metal Oxide INVERTER Unit (Continued) R6746 VRS-TW2ED561JY J 560 1/4W Metal Oxide R6747 VRS-TW2ED561JY J 560 1/4W...

  • Page 73: Cabinet And Mechanical Parts

    LC-20S5U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD676FMF0 CABINET AND MECHANICAL PARTS R/C, LED Unit CCABAB312WJ01 X Cabinet A Ass’y CAPACITORS Not Available – Cabinet A — C4000 VCEASX1CN106MY J 10 Electrolytic HDECQA474WJSA J RC/LED Cover C4001 VCKYCY1HB103KY J 0.01...
  • Page 74 LC-20S5U CABINET AND MECHANICAL PARTS R/C,LED PWB 4-10 4-11 4-10 Inverter PWB Sub PWB Main PWB...

  • Page 75: Packing Parts

    LC-20S5U Ref. No. Part No. Description Code Ref. No. Part No. Description Code PACKING PARTS SUPPLIED ACCESSORIES (NOT REPLACEMENT ITEM) LHLDWA002WJSB J Cable Clamp, x1 SPAKCC443WJZZ – Packing Case — QACCDA038WJPZ J AC Cord SPAKPA482WJZZ – Wrapping Paper — å...

  • Page 76: Packing Of The Set

    LC-20S5U PACKING OF THE SET X1, X4...
  • Page 77 LC-20S5U © COPYRIGHT 2006 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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