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Sharp LC-20A2H Service Manual

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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.
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CONTENTS
» SPECIFICATIONS ............................................. 3
» OPERATION MANUAL ...................................... 4
» DIMENSIONS .................................................... 5
» REMOVING OF MAJOR PARTS ....................... 6
» TROUBLE SHOOTING TABLE ......................... 9
» ADJUSTMENT PROCEDURE ......................... 12
» CHASSIS LAYOUT .......................................... 26
» BLOCK DIAGRAM ........................................... 28
» SCHEMATIC DIAGRAM .................................. 31
Ë ELECTRICAL PARTS .................................. 46
MAIN UNIT .................................................. 46
Y/C SEPARATION UNIT .............................. 50
TERMINAL UNIT ......................................... 52
INVERTER UNIT ......................................... 53
OPERATION UNIT ...................................... 54
Ë SUPPLIED ACCESSORIES ........................ 56
Ë PACKING PARTS ........................................ 56
» PACKING OF THE SET ................................... 57
SERVICE MANUAL
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SHARP CORPORATION
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LCD COLOUR TELEVISION
LC-20A2H
MODELS
LC-20A2M
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Summary of Contents for Sharp LC-20A2H

  • Page 1: Table Of Contents

    LC-20A2H LC-20A2M SERVICE MANUAL S00K2LC-20A2H LCD COLOUR TELEVISION !"#$ LC-20A2H MODELS LC-20A2M 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-20A2H LC-20A2M IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be perfomed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow: • Use an AC voltmeter having with 5000 ohm per volt, or...

  • Page 3: Specifications

    LC-20A2H LC-20A2M Specifications...

  • Page 4: Operation Manual

    LC-20A2H LC-20A2M Operation Manual Main unit (front view) Main unit (rear view) Remote control...

  • Page 5: Dimensions

    LC-20A2H LC-20A2M Dimensions (Unit: mm)

  • Page 6: Removing Of Major Parts

    LC-20A2H LC-20A2M REMOVING OF MAJOR PARTS 1. Detach the terminal cover. 2. Remove the four lock screws from the table stand. 3. Remove the four lock screws each from the left and right speakers. Disconnect the connectors and detach the speaker assemblies.
  • Page 7 LC-20A2H LC-20A2M 9. Remove the four lock screws from the MAIN PWB. 10. Remove the four lock screws from the Y/C SEPARATION PWB. 11. Remove the three lock screws from the INVERTER PWB. 12. Remove the lock screw from the TERMINAL PWB and the lock screw from the grounding terminal.
  • Page 8 LC-20A2H LC-20A2M » 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 electroconductive mat. 4. Be careful not to fall, shake and shock the panels.

  • Page 9: Trouble Shooting Table

    LC-20A2H LC-20A2M TROUBLE SHOOTING TABLE...
  • Page 10 LC-20A2H LC-20A2M TROUBLE SHOOTING TABLE (Continued)
  • Page 11 LC-20A2H LC-20A2M TROUBLE SHOOTING TABLE (Continued)

  • Page 12: Adjustment Procedure

    LC-20A2H LC-20A2M ADJUSTMENT PROCEDURES The product has been factory-adjusted to optimum settings. If by any chance any of the settings gets out of position or when a part has been replaced, take the following procedures. Preparations Use the specific AC adaptor or a regulated DC power supply.
  • Page 13 LC-20A2H LC-20A2M 4. Getting Initialized 4-1. Connect pins (81) and (82) of IC2001 to GND. Turn on the power. 4-2. Select the model number (A2H). 4-3. Select the screen size (20 inches). 5. Adjustments 5-1. +B adjustment (+B ADJ. on page 1) 1) Receive the colour bar signal.
  • Page 14 LC-20A2H LC-20A2M !"#$%&'( Ë !"#$%&'() *+,-./ I= !"#$%&'()*+,-./01234567 !"# J !"#$%&'()*+, » !" !" # !"#$%&' I !"#$%&'( !"#$%&"'() !"# !"#$%&'()*(%+ !"#$ I !"#$%&'( !"# !"#$%&'()*+ !" # !"#$%&'()* I !"#$ !"#$%&' PR !" !"#$%&'WcPTMN OKM !"# $ !"#$%&'()*I= ORMs cPTMO !"#$%&'()*+,...
  • Page 15 LC-20A2H LC-20A2M...
  • Page 16 LC-20A2H LC-20A2M !" !" !"...
  • Page 17 LC-20A2H LC-20A2M...
  • Page 18 LC-20A2H LC-20A2M !"#$ !"#$ !"# Q !"# !"#$%&'()*+ Q !" I !"# $%& !"#$%& !"#$ NM !"# !"# _ !"# _I !" I ==SJN== =SJV== !"# _ !"# V !"#$ I !"# !"#$%& I !"#$%&' !"#$ % !"#$%&'() 扬声器组件(右侧) 扬声器组件(左侧) 端子盖板...
  • Page 19 LC-20A2H LC-20A2M !"#$% Q !"# !"#$% Q !"# !"#$%& P !"# !"#$%&'$()* N !" I !"#$% !"#$%&'()*+,-. !"#$%& P !"# Ｙ/Ｃ分离电路板 倒相电路板 端子电路板组件 主电路板 液晶显示装置 加强板 操作电路板 机壳A...
  • Page 20 LC-20A2H LC-20A2M !"#$%&'( » !"#$%&'()* !"#$%&'( !"#$%&'() !"#$%&'()*+ !"#$%&' Q !"#$% P !"#$ I !"# !"#$%& !"#$%&' !"# !"#$%&' !"#$%&'()#* 液晶显示装置 (前面) 荧光灯(上部) (KLMP-0101CEZZ) 灯座反射器(上部) (PSHEP0223CEZZ) 导光板 ITO薄板 屏蔽板 反射薄板 (PSHEP0187CEZZ) 反射薄板 (PSHEP0186CEZZ) 荧光灯(下部) (KLMP-0102CEZZ) 灯座反射器(下部) 扩散薄板 (PSHEP0224CEZZ) 液晶显示装置 反射偏振光板...
  • Page 21 LC-20A2H LC-20A2M !"#...
  • Page 22 LC-20A2H LC-20A2M !"# !"...
  • Page 23 LC-20A2H LC-20A2M !"# !"...
  • Page 24 LC-20A2H LC-20A2M !"#$% !"#!$%&'( I !"#$% I !"#$% I !"#$%&'() !"#$ !"#$# ^` W=r^amJMONV`bww !"#W=PKS^I= !"#$W=NKM^ W=NPs==QKO^= !"# NJNK !" !"#$% !" b !"#$%&'( f !"#$%& !" !"#$ molj !"#$% NJOK !"#$%&'()* !" !"#qs !"#$%&'() !"#$% !"#$%&W ! "# I !"#$...
  • Page 25 LC-20A2H LC-20A2M ! "# QJNK f`OMMN !"# ^Oe QJOK !"# OM QJPK RJNK=H_ H_J^ag !"#$ mPMP RKMM MKMOs !"!#$%&!# I !"#$%&' RKMMs W=RKMMs !"#$%%%%%& O RJOK `lj=_f^p !"#$%&' !"#$%&'()*+, `lj=_f^p RJPK q^jm !"#$ !"#$%& ! __J`^ !" I !"#$ kqp`=q^jm I !"...

  • Page 26: Chassis Layout

    LC-20A2H LC-20A2M !"#$% CHASSIS LAYOUT MAIN Unit (Side A) Y/C SEPARATION Unit (Side A) MAIN Unit (Side B) Y/C SEPARATION Unit (Side B)

  • Page 27: Block Diagram

    LC-20A2H LC-20A2M !" BLOCK DIAGRAM...

  • Page 28: Description Of Schematic Diagram

    LC-20A2H LC-20A2M !"#$% DESCRIPTION OF SCHEMATIC DIAGRAM !"#$ VOLTAGE MEASUREMENT CONDITION: !"#$%&'()I= !" #$%&'( 1. When the exclusive-use AC adapter is used, the colour !"#$%&'"#()*"#+,-I= !" bar signal of colour bar generator for service is input to !"#$"%& get the normal screen. When the audio is minimized, the voltage value is measured with the 20 kΩ/V tester.
  • Page 29 LC-20A2H LC-20A2M Ë OPERATION Unit...
  • Page 30 LC-20A2H LC-20A2M Ë MAIN Unit -1/2 !"JNLO...
  • Page 31 LC-20A2H LC-20A2M Ë MAIN Unit -2/2 !"JNLO...
  • Page 32 LC-20A2H LC-20A2M Ë TERMINAL Unit !"#...
  • Page 33 LC-20A2H LC-20A2M Ë Y/C SEPARATION Unit !"#$%&'...
  • Page 34 LC-20A2H LC-20A2M Ë INVERTER Unit !"#...

  • Page 35: Printed Wiring Board Assemblies

    LC-20A2H LC-20A2M PRINTED WIRING BOARD ASSEMBLIES !"#$ Y/C SEPARATION Unit (Side-A) !"#$%&'()*+^ Y/C SEPARATION Unit (Side-B) !"#$%&'()*+_...
  • Page 36 LC-20A2H LC-20A2M MAIN Unit (Side-A) !" !"#^...
  • Page 37 LC-20A2H LC-20A2M MAIN Unit (Side-B) !" !"#_...
  • Page 38 LC-20A2H LC-20A2M TERMINAL Unit (Wiring Side) !"#$%& !"#$ OPERATION Unit (Wiring Side) !"#$%&'(%)!*+...
  • Page 39 LC-20A2H LC-20A2M INVERTER Unit (Wiring Side) !"#$%&'(%)!*+...

  • Page 40: Parts List

    LC-20A2H LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code !" PARTS LIST PARTS REPLACEMENT !"#$%&'()*+,-./012345'6 Replacement parts which have these special safety characteristics identified in this manual: electrical components having such features !"#$%&'()*+,-./012#34=å= are identified by "å" in the Replacement Parts Lists.
  • Page 41 LC-20A2H LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA177FE05 C729 VCKYTV1CF105Z J 1.0 Ceramic C731 VCCCCY1HH181J J 180p Ceramic MAIN UNIT (Continued) C733 RC-EZ0538CEZZ J 330 Electrolytic C734 VCKYTV1CF105Z J 1.0 Ceramic PACKAGED CIRCUITS...
  • Page 42 LC-20A2H LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA177FE05 C1222 VCKYCY1EF104Z J 0.1 Ceramic C2001 VCKYCY1HB102K J 1000p 50V Ceramic MAIN UNIT (Continued) C2002 VCCCCY1HH221J J 220p Ceramic C2003 VCEAPF1HW105M J 1.0 Electrolytic C923 VCKYCY1EF104Z J 0.1...
  • Page 43 LC-20A2H LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA177FE05 R809 VRS-CY1JF000J 1/16W Metal Oxide R810 VRS-CB1JF220J J 22 1/16W Metal Oxide MAIN UNIT (Continued) R811 VRS-CY1JF222J J 2.2k 1/16W Metal Oxide R812 VRS-CY1JF000J 1/16W Metal Oxide...

  • Page 44: Y/C Separation Unit

    LC-20A2H LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA177FE05 R2049 VRS-CY1JF332J J 3.3k 1/16W Metal Oxide R2050 VRS-CY1JF562J J 5.6k 1/16W Metal Oxide MAIN UNIT (Continued) R2051 VRS-CY1JF101J J 100 1/16W Metal Oxide R2052 VRS-CY1JF101J...

  • Page 45: Electrolytic Ac

    LC-20A2H LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA194DE05 C7048 VCKYCY1CF104Z J 0.1 Ceramic C7050 VCCCCY1HH270J J 27p Ceramic Y/C SEPARATION UNIT (Continued) C7053 VCKYCY1HB103K J 0.01 Ceramic C7054 VCKYCY1HB103K J 0.01 Ceramic Q7015 VS2SA1037KQ-1...

  • Page 46: Terminal Unit

    LC-20A2H LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA194DE05 DUNTKA331DE01 Y/C SEPARATION UNIT (Continued) TERMINAL UNIT TUNER R7044 VRS-CY1JF101J J 100 1/16W Metal Oxide NOTE: THE PARTS HERE SHOWN ARE SUPPLIED AS AN R7045 VRS-CY1JF122J J 1.2k 1/16W Metal Oxide...

  • Page 47: Inverter Unit

    LC-20A2H LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA318DE01 å F3702 QFS-C2521CEZZ J Fuse 2.5A FH3701 QFSHD1002CEZZ J Fuse Holder TERMINAL UNIT (Continued) FH3702 QFSHD1002CEZZ J Fuse Holder FH3703 QFSHD1002CEZZ J Fuse Holder C3458 VCEAPF1CN226M...

  • Page 48: Operation Unit

    2-13 XEBSD30P08000 J Screw, x6 R4029 VRS-CY1JF104J J 100k 1/16W Metal Oxide 2-14 XEBSD40P10000 J Screw, x5 2-15 HiNDP5659CESA J Model Label (LC-20A2H) SWITCHES 2-15 HiNDP5660CESA J Model Label (LC-20A2M) S4701 QSW-P0614CEZZ J MAIN POWER SW4002 QSW-K0087GEZZ J CH-DOWN CCOVA1800CE02 J Terminal Cover Ass’y...

  • Page 49: Ë Cabinet And Mechanical Parts

    LC-20A2H LC-20A2M CABNET AND MECHANICAL PARTS !"#$%&'( 2-14 2-13 2-13 2-17 2-15 2-10 2-11 2-12 Y/C Separation Unit 2-11 Inverter Unit 2-13 Terminal Unit Main Unit 1-17 1-16 1-11 1-21 1-19 1-18 1-13 1-14 1-20 1-11 1-19 1-12 1-10 1-15...

  • Page 50: Ë Supplied Accessories

    QCNW-5672CEZZ J Connecting Cord TiNS-7189CEZZ J Operation Manual QCNW-5674CEZZ J Connecting Cord (LC-20A2M) QCNW-5714CEZZ J Connecting Cord TLABN0272CEZZ J No. Label (LC-20A2H) QCNW-5717CEZZ J Connecting Cord TLABN0273CEZZ J No. Label (LC-20A2M) å QCNW-5777CEZZ J Connecting Cord UADP-0219CEZZ J AC Adaptor...

  • Page 51: Packing Of The Set

    LC-20A2H LC-20A2M PACKING OF THE SET Accessories 附件 Operation Manual 使用说明书 Cable Clamp Reinforcing Pad 接线固定夹 Batteries 加强衬垫 电池 Speaker Net 扬声器网 Wrapping Paper Caution Card 包装纸 Buffer Material 防震泡沫塑料衬垫 AC Cord 交流电源线 Reinforcing Pad 加强衬垫 Wireless Remote Conrol 遥控器...
  • Page 52 LC-20A2H LC-20A2M COPYRIGHT © 2000 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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