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Sharp LC-20SH3H Service Manual

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LC-20SH3H/M/X
LC-20SH4H/M/X
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 ........................................................................................................................................4
» OPERATION MANUAL .................................................................................................................................6
» DIMENSIONS ...............................................................................................................................................9
» REMOVING OF MAJOR PARTS ................................................................................................................ 10
» ADJUSTING PROCEDURE OF EACH SECTION ..................................................................................... 18
» PUBLIC MODE SETTING PROCEDURE ..................................................................................................22
» TROUBLE SHOOTING TABLE ..................................................................................................................24
» BLOCK DIAGRAM ......................................................................................................................................28
» OVERALL WIRING DIAGRAM ...................................................................................................................30
» DESCRIPTION OF SCHEMATIC DIAGRAM ............................................................................................. 32
ËINVERTER Unit .......................................................................................................................................33
ËMAIN Unit .................................................................................................................................................34
ËSUB Unit ..................................................................................................................................................44
ËOPERATION Unit .....................................................................................................................................50
ËR/C, LED Unit ..........................................................................................................................................51
» PRINTED WIRING BOARD ASSEMBLIES ................................................................................................53
» REPLACEMENT PARTS LIST.................................................................................................................... 69
» PACKING OF THE SET ..............................................................................................................................83
1st Edition
SERVICE MANUAL
LCD COLOUR TELEVISION
MODELS
CONTENTS
SHARP CORPORATION
LC-20SH3H/M/X
LC-20SH4H/M/X
LC-20SH3H/M/X
LC-20SH4H/M/X
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Summary of Contents for Sharp LC-20SH3H

  • Page 1: Table Of Contents

    LC-20SH3H/M/X 1st Edition LC-20SH4H/M/X SERVICE MANUAL LCD COLOUR TELEVISION LC-20SH3H/M/X LC-20SH3H/M/X LC-20SH4H/M/X LC-20SH4H/M/X MODELS 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-20SH3H/M/X LC-20SH4H/M/X 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: • Connect the resistor connection to all exposed metal...
  • Page 3 LC-20SH3H/M/X LC-20SH4H/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 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 6: Operation Manual

    LC-20SH3H/M/X LC-20SH4H/M/X OPERATION MANUAL Ë LC-20SH3H/M/X...
  • Page 7 LC-20SH3H/M/X LC-20SH4H/M/X Ë LC-20SH4H/M/X...
  • Page 8 LC-20SH3H/M/X LC-20SH4H/M/X...

  • Page 9: Dimensions

    LC-20SH3H/M/X LC-20SH4H/M/X DIMENSIONS...

  • Page 10: Removing Of Major Parts

    LC-20SH3H/M/X LC-20SH4H/M/X REMOVING OF MAJOR PARTS Ë LC-20SH3H/M/X 1. Remove the stand fixing screws (4 pcs.). 2. Remove the cabinet B fixing screws (7 pcs.). 3. Remove the cabinet B after opening from the direction of an arrow. 4. Detach the connector from each PWB.
  • Page 11 LC-20SH3H/M/X LC-20SH4H/M/X 5. Remove the 2 lock screws from the main PWB and undo the hooks a. Detach the chassis frame, together with its terminals, from the main PWB. 6. Remove the 2 lock screws from the sub PWB and undo the hooks b, c and d. Detach the chassis frame together with its terminals, from the sub PWB.
  • Page 12 LC-20SH3H/M/X LC-20SH4H/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 13 LC-20SH3H/M/X LC-20SH4H/M/X » Precautions at the time of the side-B(back) service of main, sub and Inverter unit. 1. Remove the FPC for connection between Main unit (SC1701) and LCD panel (CN1), and connect the extended cable (QCNW-C458WJQZ) for service. 2. Remove only SC1201 side of the lead from between Main unit (SC1201) and Sub unit (P7301), and connect the extended cable (QCNW-C461WJQZ) for service.
  • Page 14 LC-20SH3H/M/X LC-20SH4H/M/X Ë LC-20SH4H/M/X 1. Remove the stand cover fixing screws (1 pc.). 2. Remove the stand fixing screws (4 pcs.). 3. Remove the cabinet B fixing screws (13 pcs.). 4. Remove the cabinet B after opening from the direction of an arrow.
  • Page 15 LC-20SH3H/M/X LC-20SH4H/M/X 6. Remove the 2 lock screws from the main PWB and undo the hooks a. Detach the chassis frame, together with its terminals, from the main PWB. 7. Remove the 2 lock screws from the sub PWB and undo the hooks b, c and d. Detach the chassis frame together with its terminals, from the sub PWB.
  • Page 16 LC-20SH3H/M/X LC-20SH4H/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 17 LC-20SH3H/M/X LC-20SH4H/M/X » Precautions at the time of the side-B(back) service of main, sub and Inverter unit. 1. Remove the FPC for connection between Main unit (SC1701) and LCD panel (CN1), and connect the extended cable (QCNW-C458WJQZ) for service. 2. Remove only SC1201 side of the lead from between Main unit (SC1201) and Sub unit (P7301), and connect the extended cable (QCNW-C461WJQZ) for service.

  • Page 18: Adjusting Procedure Of Each Section

    LC-20SH3H/M/X LC-20SH4H/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 performed, adjust as follows. 1. Preparations (1) Plug the AC power cord directly into a wall outlet.
  • Page 19 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 "A646BH" (LC-20SH3H/SH4H), "A646BM" (LC-20SH3M/X/SH4M/X). (Adjustment Process Menu Page 1)
  • Page 20 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. SETTING COMPLETE ~1 :H (LC-20SH3H/SH4H) :M (LC-20SH3M/SH4M) :X (LC-20SH3X/SH4X)
  • Page 21 LC-20SH3H/M/X LC-20SH4H/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 22: Public Mode Setting Procedure

    LC-20SH3H/M/X LC-20SH4H/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 23 LC-20SH3H/M/X LC-20SH4H/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 24: Trouble Shooting Table

    LC-20SH3H/M/X LC-20SH4H/M/X TROUBLE SHOOTING TABLE...
  • Page 25 LC-20SH3H/M/X LC-20SH4H/M/X TROUBLE SHOOTING TABLE (Continued)
  • Page 26 LC-20SH3H/M/X LC-20SH4H/M/X TROUBLE SHOOTING TABLE (Continued)
  • Page 27 LC-20SH3H/M/X LC-20SH4H/M/X TROUBLE SHOOTING TABLE (Continued)

  • Page 28: Block Diagram

    LC-20SH3H/M/X LC-20SH4H/M/X BLOCK DIAGRAM MAIN PWB SDA1 SCL1 TV_V RS_R0~7 R1,G1,B1± SDA1 SCL1 V-OUT 3.3V 1.8V RS_G0~7 R2,G2,B2± TUNER 1.8V REG TU1300 IC1003 RSDS ANTENNA RS_B0~7 R3,G3,B3± IC1701 SIF-OUT 1.8V AV_V IC1004 DACM_L/R AV_SY SDA1 SOUND PROCESSOR SCL1 IC1300 SW REG 3.3V...

  • Page 29: Overall Wiring Diagram

    LC-20SH3H/M/X LC-20SH4H/M/X OVERALL WIRING DIAGRAM...

  • Page 30: Description Of Schematic Diagram

    LC-20SH3H/M/X LC-20SH4H/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 31: Schematic Diagram Ëinverter Unit

    LC-20SH3H/M/X LC-20SH4H/M/X SCHEMATIC DIAGRAM Ë INVERTER Unit...

  • Page 32: Ëmain Unit

    LC-20SH3H/M/X LC-20SH4H/M/X ËMAIN Unit-1/5...
  • Page 33 LC-20SH3H/M/X LC-20SH4H/M/X ËMAIN Unit-2/5...
  • Page 34 LC-20SH3H/M/X LC-20SH4H/M/X ËMAIN Unit-3/5...
  • Page 35 LC-20SH3H/M/X LC-20SH4H/M/X ËMAIN Unit-4/5...
  • Page 36 LC-20SH3H/M/X LC-20SH4H/M/X ËMAIN Unit-5/5...

  • Page 37: Ësub Unit

    LC-20SH3H/M/X LC-20SH4H/M/X ËSUB Unit-1/3...
  • Page 38 LC-20SH3H/M/X LC-20SH4H/M/X ËSUB Unit-2/3...
  • Page 39 LC-20SH3H/M/X LC-20SH4H/M/X ËSUB Unit-3/3...

  • Page 40: Ëoperation Unit

    LC-20SH3H/M/X LC-20SH4H/M/X Ë OPERATION Unit...

  • Page 41: Ër/C, Led Unit

    LC-20SH3H/M/X LC-20SH4H/M/X Ë R/C, LED Unit (LC-20SH3H/M/X)
  • Page 42 LC-20SH3H/M/X LC-20SH4H/M/X Ë R/C, LED Unit (LC-20SH4H/M/X)

  • Page 43: Printed Wiring Board Assemblies

    LC-20SH3H/M/X LC-20SH4H/M/X PRINTED WIRING BOARD ASSEMBLIES OPERATION Unit OPERATION Unit (Wiring Side) (Chip Parts Side)
  • Page 44 LC-20SH3H/M/X LC-20SH4H/M/X 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 45 LC-20SH3H/M/X LC-20SH4H/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...
  • Page 46 LC-20SH3H/M/X LC-20SH4H/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 47 LC-20SH3H/M/X LC-20SH4H/M/X TL1701 TL1705 TL1711 TL1720 TL1726 TL1732 TL1736 TL1744 TL1750 TL1708 TL1714 TL1715 TL1721 TL1727 TL1733 TL1741 TL1745 TL1754 TL2032 TL1710 TL1716 TL1722 TL1728 TL1734 TL1739 TL1746 TL1702 TL1751 TL1713 R2011 C1734 TL1704 TL1707 TL1718 TL1724 TL1730 TL1737 TL1743...
  • Page 48 LC-20SH3H/M/X LC-20SH4H/M/X SUB Unit (Wiring Side) (QPWBFD567WJN1)
  • Page 49 LC-20SH3H/M/X LC-20SH4H/M/X C3601 C3601 Q3601 Q3601 D7308 D7308 C7311 C7311 R3602 R3602 C7301 C7301 C6703 C6703 R6703 R6703 R7309 R7309 Q7301 Q7301 R7301 R7301 Q6702 Q6702 R3603 R3603 C7304 C7304 C6725 C6725 Q3602 Q3602 R7302 R7302 Q7303 Q7303 R6702 R6702...
  • Page 50 LC-20SH3H/M/X LC-20SH4H/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 R6732 R6711 TL6721 TL6722 TL6021 TL6719 C6725 TL6023 C6718 TL6027...
  • Page 51 LC-20SH3H/M/X LC-20SH4H/M/X Ë LC-20SH3H/M/X R/C, LED Unit (Wiring Side) Q4101 Q4102 R4101 Q4103 Q4104 R4102 R4103 Q4105 R4109 R/C, LED Unit (Chip Parts Side) Ë LC-20SH4H/M/X R/C, LED Unit (Wiring Side) Q4005 R4009 Q4003 Q4001 Q4004 Q4002 R4007 R4005 R4002...
  • Page 52 DUNTKD547FM12 (LC-20SH3H) DUNTKD547FM21 (LC-20SH4H) DUNTKD547FM15 (LC-20SH3M) DUNTKD547FM24 (LC-20SH4M) “HOW TO ORDER REPLACEMENT PARTS”...
  • Page 53 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD547FM12 (LC-20SH3H) DUNTKD547FM21 (LC-20SH4H) C1057 VCKYCZ1AB333KY J 0.033 10V Ceramic DUNTKD547FM15 (LC-20SH3M) DUNTKD547FM24 (LC-20SH4M) C1058 VCKYCZ1AB333KY J 0.033 10V Ceramic DUNTKD547FM18 (LC-20SH3X) DUNTKD547FM27 (LC-20SH4X) C1059 VCKYCZ1AB333KY J 0.033 10V...
  • Page 54 LC-20SH4H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD547FM12 (LC-20SH3H) DUNTKD547FM21 (LC-20SH4H) C1729 VCKYCY1HB103KY J 0.01 Ceramic DUNTKD547FM15 (LC-20SH3M) DUNTKD547FM24 (LC-20SH4M) C1730 VCKYCY1HB103KY J 0.01 Ceramic DUNTKD547FM18 (LC-20SH3X) DUNTKD547FM27 (LC-20SH4X) C2002 VCKYCY1EF104ZY J 0.1 Ceramic...
  • Page 55 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD547FM12 (LC-20SH3H) DUNTKD547FM21 (LC-20SH4H) R1315 VRS-CY1JF332JY J 3.3k 1/16W Metal Oxide DUNTKD547FM15 (LC-20SH3M) DUNTKD547FM24 (LC-20SH4M) R1316 VRS-CY1JF101JY J 100 1/16W Metal Oxide DUNTKD547FM18 (LC-20SH3X) DUNTKD547FM27 (LC-20SH4X) R1317 VRS-CJ1JF331JY...
  • Page 56 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD547FM12 (LC-20SH3H) DUNTKD547FM21 (LC-20SH4H) DUNTKD567WE03 (LC-20SH3H) DUNTKD567WE12 (LC-20SH4H) DUNTKD547FM15 (LC-20SH3M) DUNTKD547FM24 (LC-20SH4M) DUNTKD567WE06 (LC-20SH3M) DUNTKD567WE15 (LC-20SH4M) DUNTKD547FM18 (LC-20SH3X) DUNTKD547FM27 (LC-20SH4X) DUNTKD567WE09 (LC-20SH3X) DUNTKD567WE18 (LC-20SH4X) MAIN Unit (Continued) SUB Unit...
  • Page 57 LC-20SH4H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD567WE03 (LC-20SH3H) DUNTKD567WE12 (LC-20SH4H) C7305 VCCCCY1HH330JY J 33p Ceramic DUNTKD567WE06 (LC-20SH3M) DUNTKD567WE15 (LC-20SH4M) C7306 VCCCCY1HH471JY J 470p Ceramic DUNTKD567WE09 (LC-20SH3X) DUNTKD567WE18 (LC-20SH4X) C7308 VCKYCY1HB103KY J 0.01 Ceramic SUB Unit (Continued) C7309 VCKYCY1AB684KY J 0.68...
  • Page 58 LC-20SH4H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD567WE03 (LC-20SH3H) DUNTKD567WE12 (LC-20SH4H) R7772 VRS-CY1JF000JY 1/16W Metal Oxide DUNTKD567WE06 (LC-20SH3M) DUNTKD567WE15 (LC-20SH4M) DUNTKD567WE09 (LC-20SH3X) DUNTKD567WE18 (LC-20SH4X) MISCELLANEOUS PARTS SUB Unit (Continued) å F7701 QFS-D0010CEZZ J Fuse, 3.15A/250V...
  • Page 59 J Socket, 8-pin RMC4001 RRMCUA034WJQZ J R/C Receiver RMC4101 RRMCUA034WJQZ J R/C Receiver LHLDZA555WJZZ J LED Holder LHLDZA642WJZZ J LED Holder DUNTKD568WE03 (LC-20SH3H) DUNTKD568WE12 (LC-20SH4H) DUNTKD652FM03 DUNTKD568WE06 (LC-20SH3M) DUNTKD568WE15 (LC-20SH4M) DUNTKD568WE09 (LC-20SH3X) DUNTKD568WE18 (LC-20SH4X) INVERTER Unit OPERATION Unit DIODES TRANSISTORS D4201 RH-EX0610GEZZY J Zener Diode, 4.7V...
  • Page 60 LC-20SH3H/M/X LC-20SH4H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code R6724 VRS-CY1JF471JY J 470 1/16W Metal Oxide DUNTKD652FM03 R6725 VRS-CY1JF824JY J 820k 1/16W Metal Oxide INVERTER Unit (Continued) R6726 VRD-RA2BE562JY J 5.6k 1/8W Carbon R6727 VRD-RA2BE562JY J 5.6k 1/8W...
  • Page 61 J PWB Spacer, x3 QCNW-B813WJPZ J Connecting Cord QCNW-D461WJQZ J Connecting Cord QPWBMD346WJPZ J Connecting Cord LHLDZA642WJZZ J LED Holder QEARPA125WJFW J Grounding Part TLABMB944WJZZ Model Label (LC-20SH3H) TLABMB945WJZZ Model Label (LC-20SH3M) TLABMB946WJZZ Model Label (LC-20SH3X) XEBS940P20000 J Screw, x5...
  • Page 62 LC-20SH3H/M/X LC-20SH4H/M/X CABINET AND MECHANICAL PARTS (LC-20SH3H/M/X) Operation PWB R/C,LED PWB 5-10 5-11 3-5 3-4 5-10 Inverter PWB Sub PWB Main PWB...
  • Page 63 LC-20SH3H/M/X LC-20SH4H/M/X Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET AND MECHANICAL PARTS XBBS940P10000 J Screw, x1 XBBS940P18000 J Screw, x4 (LC-20SH4H/M/X) XEBS940P20000 J Screw, x11 XEBSN30P12000 J Screw, x7 CCABAB121WJ02 Cabinet A Ass’y XHBS830P10000...
  • Page 64 LC-20SH3H/M/X LC-20SH4H/M/X CABINET AND MECHANICAL PARTS (LC-20SH4H/M/X) Operation R/C, LED PWB 5-10 5-11 5-10 Inverter PWB Sub PWB Main PWB...
  • Page 65 Ref. No. Part No. Description Code PACKING PARTS SUPPLIED ACCESSORIES (NOT REPLACEMENT ITEM) LC-20SH3H/M/X LC-20SH3H/M/X QACCBA016WJPZ J AC Cord (LC-20SH3H) SPAKCC352WJZZ – Packing Case (LC-20SH3H) — å QACCKA006WJPZ J AC Cord (LC-20SH3M) SPAKCC396WJZZ – Packing Case (LC-20SH3M) — å QACCLA022WJPZ...

  • Page 66: Packing Of The Set

    LC-20SH3H/M/X LC-20SH4H/M/X PACKING OF THE SET...
  • Page 67 LC-20SH3H/M/X LC-20SH4H/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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