Sharp LC-20A2U 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.

» IMPORTANT SERVICE SAFETY NOTES ......... 2

» SPECIFICATIONS ............................................. 4

» OPERATION MANUAL ...................................... 5

» DIMENSIONS .................................................... 7

» REMOVING OF MAJOR PARTS ....................... 8

» TROUBLE SHOOTING TABLE ........................11

» ADJUSTMENT PROCEDURES ...................... 14

» CHASSIS LAYOUT .......................................... 16

» BLOCK DIAGRAM ........................................... 18

» DESCRIPTION OF SCHEMATIC DIAGRAM .. 20

» SCHEMATIC DIAGRAM

Ë OPERATION UIT ....................................... 21

Ë MAIN UNIT ................................................ 22

Ë TERMINAL UNIT ....................................... 26

SHARP CORPORATION

SERVICE MANUAL

LCD COLOR TELEVISION

LC-20A2U

MODEL

CONTENTS

Page

Ë Y/C SEPARATION UNIT ............................ 28

Ë INVERTER UNIT ....................................... 30

» PRINTED WIRING BOARD ASSEMBLIES ..... 31

» PARTS LIST

Ë ELECTRICAL PARTS ................................ 36

Ë MAIN UNIT ................................................ 36

Ë Y/C SEPARATION UNIT ............................ 40

Ë TERMINAL UNIT ....................................... 42

Ë INVERTER UNIT ....................................... 43

Ë OPERATION UNIT .................................... 44

Ë CABINET AND MECHANICAL PARTS ..... 44

Ë ACCESSORIES PARTS ............................ 46

Ë PACKING PARTS ...................................... 46

» PACKING OF THE SET ................................... 47

This document has been published to be used for

after sales service only.

The contents are subject to change without notice.

LC-20A2U

S00J6LC-20A2U

Page

Table of Contents

Summary of Contents for Sharp LC-20A2U

Page 1: Table Of Contents
LC-20A2U SERVICE MANUAL S00J6LC-20A2U LCD COLOR TELEVISION LC-20A2U 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-20A2U 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 LC-20A2U 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. • Utiliser un voltmètre CA d'une sensibilité d'au moins AVERTISSEMENT 5000Ω/V pour mesurer la chute de tension en travers...
Page 4: Specifications
LC-20A2U Specifications...
Page 5: Operation Manual
LC-20A2U Operation Manual...
Page 6 LC-20A2U...
Page 7: Dimensions
LC-20A2U Dimensions (Unit: inch/mm)
Page 8: Removing Of Major Parts
LC-20A2U 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 9 LC-20A2U 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 10 LC-20A2U » 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 11: Trouble Shooting Table
LC-20A2U TROUBLE SHOOTING TABLE...
Page 12 LC-20A2U TROUBLE SHOOTING TABLE (Continued)
Page 13 LC-20A2U TROUBLE SHOOTING TABLE (Continued)
Page 14: Adjustment Procedures
LC-20A2U 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 15 LC-20A2U 4. Getting Initialized 4-1. Connect pins (81) and (82) of IC2001 to GND. Turn on the power. 4-2. Select the model number (A2U). 4-3. Select the screen size (20 inches). Note: This procedure is needed only when the IC2001 or IC2004 (EEPROM) has been replaced.
Page 16: Chassis Layout
LC-20A2U CHASSIS LAYOUT MAIN Unit (Side A) Y/C SEPARATION Unit (Side A) MAIN Unit (Side B) Y/C SEPARATION Unit (Side B)
Page 17: Block Diagram
LC-20A2U BLOCK DIAGRAM...
Page 18: Description Of Schematic Diagram
LC-20A2U DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: CAUTION: 1. Voltages at test points are measured at the This circuit diagram is original one, therefore there may be a supply voltage of AC 120V. Signals are fed by a slight difference from yours.
Page 19: Schematic Diagram
LC-20A2U SCHEMATIC DIAGRAM Ë OPERATION Unit...
Page 20: Ë Main Unit
LC-20A2U Ë MAIN Unit-1/2...
Page 21 LC-20A2U Ë MAIN Unit-2/2...
Page 22: Ë Terminal Unit
LC-20A2U Ë TERMINAL Unit...
Page 23: Ë Y/C Separation Unit
LC-20A2U Ë Y/C SEPARATION Unit...
Page 24: Ë Inverter Unit
LC-20A2U Ë INVERTER Unit...
Page 25: Printed Wiring Board Assemblies
LC-20A2U PRINTED WIRING BOARD ASSEMBLIES Y/C SEPARATION Unit (Side-A) Y/C SEPARATION Unit (Side-B)
Page 26 LC-20A2U MAIN Unit (Side-A)
Page 27 LC-20A2U MAIN Unit (Side-B)
Page 28 LC-20A2U OPERATION Unit (Wiring Side) TERMINAL Unit (Wiring Side)
Page 29 LC-20A2U INVERTER Unit (Wiring Side)
Page 30: Parts List
4. DESCRIPTION in USA: Contact your nearest SHARP Parts Distributor to order. in CANADA: Contact SHARP Electronics of Conada Limited For location of SHARP Parts Distributor, Please call Toll- Phone (416) 890-2100 Free; 1-800-BE-SHARP MARK: SPARE PARTS-DELIVERY SECTION MARQUE: SECTION LIVRAISON DES PIECES DE RECHANGE Ref.
Page 31 LC-20A2U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA177FE04 C711 VCKYCY1EB103K J 0.01 Ceramic C712 VCEAPT1CN226M J 22 Electrolytic MAIN UNIT (Continued) C713 RC-EZ1176CEZZ J 100 Electrolytic C716 VCKYTV1CF105Z J 1.0 Ceramic D712 VHDDAN222//-1 J Diode...
Page 32 LC-20A2U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA177FE04 C1212 VCKYCY1EF104Z J 0.1 Ceramic C1213 VCEAPF0JW107M J 100 6.3V Electrolytic MAIN UNIT (Continued) C1214 VCEAPF0GW107M J 100 4.0V Electrolytic C1215 RC-KZ1025CEZZ J 1.0 Ceramic C913 VCKYCY1EF104Z J 0.1...
Page 33 LC-20A2U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA177FE04 R803 VRS-CB1JF220J J 22 1/16W Metal Oxide R804 VRS-CA1JF101J J 100 1/16W Metal Oxide MAIN UNIT (Continued) R806 VRS-CY1JF221J J 220 1/16W Metal Oxide R807 VRS-CY1JF000J...
Page 34 LC-20A2U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA177FE04 R2044 VRS-CB1JF103J J 10k 1/16W Metal Oxide R2045 VRS-CY1JF223J J 22k 1/16W Metal Oxide MAIN UNIT (Continued) R2047 VRS-CY1JF223J J 22k 1/16W Metal Oxide R2048 VRS-CY1JF332J J 3.3k 1/16W Metal Oxide...
Page 35 LC-20A2U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA194DE04 C7045 VCEAPF0JW476M J 47 6.3V Electrolytic C7046 VCEAPF1CN476M J 47 Electrolytic Y/C SEPARATION UNIT (Continued) C7047 VCEAPF0JW476M J 47 6.3V Electrolytic C7048 VCKYCY1CF104Z J 0.1 Ceramic...
Page 36 LC-20A2U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA194DE04 DUNTKA318DE01 Y/C SEPARATION UNIT (Continued) TERMINAL UNIT TUNER R7041 VRS-CB1JF101J J 100 1/16W Metal Oxide NOTE: THE PARTS HERE SHOWN ARE SUPPLIED AS AN R7042 VRS-CB1JF101J J 100 1/16W Metal Oxide ASSEMBLY BUT NOT INDEPENDENTLY.
Page 37: Ë Inverter Unit
LC-20A2U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA318DE01 å F3702 QFS-B3221GEZZ J Fuse, 3.15A FH3701 QFSHD1002CEZZ J Fuse Holder TERMINAL UNIT (Continued) FH3702 QFSHD1002CEZZ J Fuse Holder FH3703 QFSHD1002CEZZ J Fuse Holder C3458 VCEAPF1CN226M...
Page 38 LC-20A2U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA320DE01 CABINET PARTS LOCATION OPERATION UNIT CCABA2380CE06 J Front Cabinet Ass’y TRANSISTORS Not Available – Front Cabinet — Q4003 VSDTC144EE/-1 J DTC144EE GCOVA1808CEZZ J Cover, LED Q4005 VSDTC144EE/-1...
Page 39 LC-20A2U CABNET AND MECHANICAL PARTS 2-14 2-13 2-13 2-17 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 Operation Unit...
Page 40: Ë Accessories Parts
LC-20A2U Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET PARTS LOCATION ACCESSORIES PARTS (Continued) PSPAT0003CEZZ J Tape LHLDW1028GEZZ J Cable Clamp, x2 PZETK0065CEZZ J Insulating Sheet RRMCG1559CESA J Wireless Remote Control PZETK0094CEZZ J Insulating Sheet...
Page 41: Packing Of The Set
LC-20A2U PACKING OF THE SET Accessories Operation Manual Cable Clamp Batteries Reinforcing Pad Speaker Net Caution Label for Carrying Buffer Material AC Cord Reinforcing Pad Wireless Remote Control AC Adaptor Antenna Cable Packing Case...
Page 42 LC-20A2U 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.

Sharp LC-20A2U Service Manual

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