Sharp LC-20S5H Service Manual
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Sharp LC-20S5H Service Manual

Sharp LC-20S5H Service Manual

Lcd colour television
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See also: Operating 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.
» IMPORTANT SERVICE SAFETY PRECAUTION ........................................................................................ 2
» SPECIFICATIONS ........................................................................................................................................4
» OPERATION MANUAL .................................................................................................................................5
» DIMENSIONS ...............................................................................................................................................7
» REMOVING OF MAJOR PARTS ..................................................................................................................8
» ADJUSTING PROCEDURE OF EACH SECTION ..................................................................................... 12
» PUBLIC MODE SETTING PROCEDURE ..................................................................................................16
» TROUBLE SHOOTING TABLE ..................................................................................................................23
» BLOCK DIAGRAM ......................................................................................................................................26
» OVERALL WIRING DIAGRAM ...................................................................................................................28
» DESCRIPTION OF SCHEMATIC DIAGRAM ............................................................................................. 30
ËINVERTER Unit .......................................................................................................................................31
ËMAIN Unit .................................................................................................................................................32
ËSUB Unit ..................................................................................................................................................42
ËOPERATION Unit .....................................................................................................................................48
ËR/C, LED Unit ..........................................................................................................................................49
» PRINTED WIRING BOARD ASSEMBLIES ................................................................................................50
» REPLACEMENT PARTS LIST....................................................................................................................65
» PACKING OF THE SET ..............................................................................................................................77
1st Edition
SERVICE MANUAL
LCD COLOUR TELEVISION
MODELS
CONTENTS
SHARP CORPORATION
LC-20S5H/M/X
LC-20S5H/M/X
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Summary of Contents for Sharp LC-20S5H

  • Page 1: Table Of Contents

    LC-20S5H/M/X 1st Edition SERVICE MANUAL LCD COLOUR TELEVISION LC-20S5H/M/X MODELS 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.

  • Page 2: Important Service Safety Precaution

    LC-20S5H/M/X IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow: • Connect the resistor connection to all exposed metal WARNING parts having a return to the chassis (antenna, metal 1.
  • Page 3 LC-20S5H/M/X Precautions for using lead-free solder 1 Employing lead-free solder "AII 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 4: Specifications

    0°C to +40°C ËAs 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 5: Operation Manual

    LC-20S5H/M/X OPERATION MANUAL...
  • Page 6 LC-20S5H/M/X...

  • Page 7: Dimensions

    LC-20S5H/M/X DIMENSIONS Unit: mm 138.9 53.4 97.6 482.8 403.1...

  • Page 8: Removing Of Major Parts

    LC-20S5H/M/X 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 cabinet B fixing screws (10 pcs.).
  • Page 9 LC-20S5H/M/X 8. Remove the 2 lock screws from the main PWB and undo the hooks a. Detach the main PWB, together with its terminals, from the chassis frame. 9. Remove the 6 lock screws from the sub PWB and undo the hooks b, c, d and e. Detach the sub PWB together with its terminals, from the chassis frame.
  • Page 10 LC-20S5H/M/X » 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 11 LC-20S5H/M/X » Precautions at the time of the side-B(back) service of main, sub and Inverter unit. 1. Remove only SC1701 of the FPC for connection between Main unit (SC1701) and LCD panel (CN1), and connect the extended cable (QCNW-C458WJQZ) for service.

  • Page 12: Adjusting Procedure Of Each Section

    LC-20S5H/M/X ADJUSTING PROCEDURE OF EACH SECTION The best adjustment is made before shipping. If any position deviation is found or after part replacement is per- formed, adjust as follows. 1. Preparations (1) Plug the AC power cord directly into a wall outlet.
  • Page 13 LC-20S5H/M/X [4] Initialization 4-1. Ground pins (81) and (82) of IC2001 (microprocessor) and turn on the power. 4-2. Make sure the screen size is set at 20 inches. 4-3. Make sure the model number is "A646AH". (Adjustment Process Menu Page 1) 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 5-1.
  • Page 14 LC-20S5H/M/X 6-3. White balance adjustment 1) Adjustment procedure Adjust the RGB CUTOFF2 setting for white 40% first and then the RGB-GAIN setting for white 80%. (1) Adjusting the test signal [Input signal] White 80% (191 gradations) for the left of screen, and white 40% (92 gradations) for the right.
  • Page 15 LC-20S5H/M/X TEST PATTERN IN THE ADJUSTMENT PROCESS MODE IC1201 (LCD controller) test pattern 1) Getting the test pattern displayed Call the adjustment process mode, select "DVP" on page 4, and press the ENTER button. Next select "DVP TEST PATTERN" in line 2 on page 1. (The "DVP TEST PATTERN" turns yellow.) Now use the cursor RIGHT/ LEFT keys to get the test pattern displayed.

  • Page 16: Public Mode Setting Procedure

    LC-20S5H/M/X 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 17 LC-20S5H/M/X 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 18 LC-20S5H/M/X 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 19 LC-20S5H/M/X (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 20 LC-20S5H/M/X (8) ON SCREEN DISPLAY Selection Selection between "Yes" and "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 » ON-timer (Wake-up timer) is cleared and set to "OFF".
  • Page 21 LC-20S5H/M/X (10) INPUT MODE FIXED " " " " Selection Selection between Variable Fixed (loop provide) Default – (Variable) " " Explanation The input mode is fixed at the input source or the channel set at the Input mode start in 9 and other input sources and channels can be made non-selectable.
  • Page 22 LC-20S5H/M/X Sound only mode function specifications 1 Behavior of the remote control BACKLIGHT button. BACKLIGHT [BRIGHT]→BACKLIGHT [NORMAL]→ BACKLIGHT [DARK]→BACKLIGHT [AUTO]→BACKLIGHT [OFF]→BACKLIGHT [BRIGHT] (The "OFF" setting is added while the remote control BACKLIGHT button is effective. With "YES" selected in "SOUND ONLY MODE".) 2 When the "OFF"...

  • Page 23: Trouble Shooting Table

    LC-20S5H/M/X TROUBLE SHOOTING TABLE...

  • Page 24: Trouble Shooting Table

    LC-20S5H/M/X TROUBLE SHOOTING TABLE (Continued)
  • Page 25 LC-20S5H/M/X TROUBLE SHOOTING TABLE (Continued)

  • Page 26: Block Diagram

    LC-20S5H/M/X BLOCK DIAGRAM MAIN PWB SDA1 SCL1 TV_V SDA1 VIDEO OUT VIDEO SELECTOR R1,G1,B1± RS_R0~7 TUNER V-OUT SCL1 3.3V 1.8V REG 1.8V IC1001 RS_G0~7 R2,G2,B2± RS_B0~7 ANTENNA IC1003 RSDS R3,G3,B3± TU1300 SIF-OUT 1.8V IC1701 AV_V IC1004 DACM_L/R AV_SY SDA1 SOUND PROCESSOR...

  • Page 27: Overall Wiring Diagram

    LC-20S5H/M/X OVERALL WIRING DIAGRAM...

  • Page 28: Description Of Schematic Diagram

    LC-20S5H/M/X DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: 1. The voltages at test points are measured on the stable supply voltage of AC 110-240V. Signals are fed by a colour bar signal generator for servicing purpose and the above voltages are measured with a 20k ohm/V tester.

  • Page 29: Schematic Diagram Ëinverter Unit

    LC-20S5H/M/X SCHEMATIC DIAGRAM Ë INVERTER Unit...

  • Page 30: Ëmain Unit

    LC-20S5H/M/X Ë MAIN Unit-1/5...
  • Page 31 LC-20S5H/M/X Ë MAIN Unit-2/5...
  • Page 32 LC-20S5H/M/X Ë MAIN Unit-3/5...
  • Page 33 LC-20S5H/M/X Ë MAIN Unit-4/5...
  • Page 34 LC-20S5H/M/X Ë MAIN Unit-5/5...

  • Page 35: Ësub Unit

    LC-20S5H/M/X Ë SUB Unit-1/3...
  • Page 36 LC-20S5H/M/X Ë SUB Unit-2/3...
  • Page 37 LC-20S5H/M/X Ë SUB Unit-3/3...

  • Page 38: Ëoperation Unit

    LC-20S5H/M/X Ë OPERATION Unit...

  • Page 39: Ër/C, Led Unit

    LC-20S5H/M/X Ë R/C, LED Unit...
  • Page 40 LC-20S5H/M/X PRINTED WIRING BOARD ASSEMBLIES SC1701 SC2003 IC1201 IC1702 C1203 C1224 L1203 X2001 IC2003 Q1222 C1090 L1000 C1222 C1223 P2001 C2003 C1204 C1009 C1054 TU1300 L1303 C1218 C1322 CMPDRC[ Lay ] C1344 C1339 C1340 IC1300 C1333 C1342 P1201 MAIN Unit (Side-A)
  • Page 41 LC-20S5H/M/X R1203 R1238 Q1216 R1288 C1267 C1228 C1209 SC1701 R1243 C1269 SC2003 C1232 C1735 C1733 C1268 R1229 R1074 R1230 IC1201 C1073 R1069 C1072 R1070 C1071 R1055 C1069 C1070 C1068 R1054 C1067 R1285 R1284 C1066 C1065 R1053 C1063 IC1004 R1276 C1061...
  • Page 42 LC-20S5H/M/X Q1204 Q1205 SC2003 IC1701 Q1218 IC1205 Q2001 Q1207 Q2003 R1227 IC1001 Q1212 Q1209 Q1211 Q2005 Q1213 IC1000 L1303 Q2006 D1302 C1344 Q1309 Q1308 Q1305 Q1307 Q1304 Q1302 P1201 MAIN Unit (Side-B)
  • Page 43 LC-20S5H/M/X TL1701 TL1705 TL1711 TL1720 TL1726 TL1732 TL1736 TL1744 TL1750 TL1708 TL1714 TL1715 TL1721 TL1727 TL1733 TL1741 TL1745 TL1716 TL1722 TL1728 TL1734 TL1739 TL1746 TL1754 TL2032 TL1702 TL1710 TL1751 TL1713 R2011 C1734 TL1704 TL1707 TL1718 TL1724 TL1730 TL1737 TL1743 TL1748...
  • Page 44 LC-20S5H/M/X DUNTKD548WE QPWBFD548WJN1 R7334 R7333 L7004 R7733 C7014 L7002 FB7007 D7005 L7001 R7337 C7739 C7003 C7738 R7003 C7737 R7001 C7735 R7778 SUB Unit (Wiring Side) L7732 C7736 R7727 T7701 R7730 HM7734 P3902 P3901 HM7732 HM7733 HM7735 FB7731 C3330 C7734 R7756...
  • Page 45 LC-20S5H/M/X TL3606 TL3607 TL7303 TL7307 TL7305 Q7758 TL7314 TL7301 Q7752 Q7754 TL7741 Q3601 R7760 TL3603 TL7302 TL3604 Q7753 TL3602 D7734 TL7304 Q3602 TL7306 TL7308 TL3605 TL3601 TL7310 R7301 Q7303 Q7305 C7007 C7308 TL7312 C7312 TL7740 TL7316 IC7301 R7315 R7314 D7305...
  • Page 46 LC-20S5H/M/X INVERTER Unit (Wiring Side) TL6711 TL6710 TL6708 TL6709 TL6712 TL6713 TL6714 TL6715 TL6716 TL6717 TL6727 TL6728 TL6731 TL6732 TL6720 TL6029 TL6031 TL6028 TL6030 R6710 TL6730 TL6729 TL6718 TL6032 TL6721 R6732 R6711 TL6722 TL6021 TL6719 C6725 TL6023 C6718 TL6027 TL6018...
  • Page 47 LC-20S5H/M/X POWER SW4201 VOL - VOL + CH DOWN CH UP MENU INPUT SW4202 SW4207 SW4206 SW4203 SW4205 SW4204 SC4201 DUNTKD549WE QPWBFD549WJN1 D4204 OPERATION Unit (Wiring Side) cam2 R4202 R4204 R4201 R4203 OPERATION Unit (Chip Parts Side) KD591WE J4000 IC4000...

  • Page 48: Printed Wiring Board Assemblies

    Part No. Description Code Ref. No. Part No. Description Code PARTS LIST DUNTKD547FM30 (LC-20S5H) DUNTKD547FM33 (LC-20S5M) DUNTKD547FM36 (LC-20S5X) PARTS REPLACEMENT MAIN Unit TUNER Replacement parts which have these special safety characteristics NOTE: THE PARTS HERE SHOWN ARE SUPPLIED AS AN identified in this manual;...
  • Page 49 LC-20S5H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD547FM30 (LC-20S5H) C1063 VCKYCZ1AB104KY J 0.1 10V Ceramic DUNTKD547FM33 (LC-20S5M) C1064 VCCCCY1HH5R0CY J 5p 50V Ceramic DUNTKD547FM36 (LC-20S5X) C1065 VCKYCZ1AB333KY J 0.033 10V Ceramic MAIN Unit (Continued) C1066 VCKYCZ1AB333KY J 0.033 10V Ceramic...
  • Page 50 LC-20S5H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD547FM30 (LC-20S5H) C2007 VCKYCY1HB222KY J 2200p 50V Ceramic DUNTKD547FM33 (LC-20S5M) C2009 VCKYCY1HB222KY J 2200p 50V Ceramic DUNTKD547FM36 (LC-20S5X) C2010 VCKYCY1EF104ZY J 0.1 Ceramic MAIN Unit (Continued) C2011 VCKYTV1CF105ZY J 1...
  • Page 51 LC-20S5H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD547FM30 (LC-20S5H) R1317 VRS-CJ1JF331JY J 330 1/16W Metal Oxide DUNTKD547FM33 (LC-20S5M) R1318 VRS-CY1JF101JY J 100 1/16W Metal Oxide DUNTKD547FM36 (LC-20S5X) R1319 VRS-CY1JF562FY J 5.6k 1/16W Metal Oxide...
  • Page 52 LC-20S5H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD547FM30 (LC-20S5H) DUNTKD548WE12 (LC-20S5H) DUNTKD547FM33 (LC-20S5M) DUNTKD548WE15 (LC-20S5M) DUNTKD547FM36 (LC-20S5X) DUNTKD548WE18 (LC-20S5X) MAIN Unit (Continued) SUB Unit INTEGRATED CIRCUITS R2048 VRS-CY1JF104JY J 100k 1/16W Metal Oxide R2049 VRS-CY1JF101JY...
  • Page 53 LC-20S5H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD548WE12 (LC-20S5H) C7006 RC-EZA184WJZZ+ J 1000 50V Electrolytic DUNTKD548WE15 (LC-20S5M) C7007 VCKYCY1HF104ZY J 0.1 50V Ceramic DUNTKD548WE18 (LC-20S5X) C7008 RC-EZA159WJZZ+ J 330 16V Electrolytic SUB Unit (Continued)
  • Page 54 LC-20S5H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD548WE12 (LC-20S5H) R7718 VRS-TQ2BD562JY J 5.6k 1/8W Metal Oxide DUNTKD548WE15 (LC-20S5M) R7719 VRD-RA2HD220JY J 22 1/2W Carbon DUNTKD548WE18 (LC-20S5X) R7720 VRS-TQ2BD102JY J 1k 1/8W Metal Oxide SUB Unit (Continued)

  • Page 55: Inverter Unit

    LC-20S5H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD549WE12 (LC-20S5H) DUNTKD652FM03 DUNTKD549WE15 (LC-20S5M) DUNTKD549WE18 (LC-20S5X) INVERTER Unit OPERATION Unit (Continued) DIODES TRANSISTORS D4201 RH-EX0610GEZZY J Zener Diode, 4.7V Q6700 VS2SC5886A+-1Y J 2SC5886A D4202 RH-EX0610GEZZY J Zener Diode, 4.7V...
  • Page 56 LC-20S5H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD652FM03 HM6708 LX-GZ3002PEZZ J Screw HM6709 LX-GZ3002PEZZ J Screw INVERTER Unit (Continued) HM6710 LX-GZ3002PEZZ J Screw HM6711 LX-GZ3002PEZZ J Screw HM6712 LX-GZ3002PEZZ J Screw C6743 VCKYCY1CB333KY J 0.033 16V Ceramic...

  • Page 57: Cabinet And Mechanical Parts

    J Screw, x4 (1,000 pcs.) 4-11 LX-HZ2055TPZS J Screw, x1 (1,000 pcs.) LCHSMA263WJKA Chassis Frame GCOVAB082WJKA J Stand Cover GCOVAB310WJKA Bass-Cone Cover HiNDPB494WJSA Model Label (LC-20S5H) HiNDPB495WJSA Model Label (LC-20S5M) HiNDPB496WJSA Model Label (LC-20S5X) JHNDPA017WJKA J Carrying Handle LX-BZ3442CEF9 J Screw, x4 PSLDMA763WJFW...
  • Page 58 LC-20S5H/M/X CABINET AND MECHANICAL PARTS R/C, LED PWB 4-10 4-11 2-13 4-10 Inverter PWB 2-11 2-12 Sub PWB 2-10 Operation 2-14 Main PWB...

  • Page 59: Packing Parts

    Description Code Ref. No. Part No. Description Code PACKING PARTS SUPPLIED ACCESSORIES (NOT REPLACEMENT ITEM) å QACCBA016WJPZ J AC Cord (LC-20S5H) SPAKCC283WJZZ – Packing Case (LC-20S5H) — å QACCKA006WJPZ J AC Cord (LC-20S5M) SPAKCC284WJZZ – Packing Case (LC-20S5M) — å...

  • Page 60: Packing Of The Set

    LC-20S5H/M/X PACKING OF THE SET X3, X4...
  • Page 61 LC-20S5H/M/X 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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