Sharp LC-20A2M Service Manual
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Sharp LC-20A2M Service Manual

Sharp LC-20A2M 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.
» SPECIFICATIONS ............................................. 3
» OPERATION MANUAL ...................................... 4
» DIMENSIONS .................................................... 5
» REMOVING OF MAJOR PARTS ....................... 6
» TROUBLE SHOOTING TABLE .......................... 9
» ADJUSTMENT PROCEDURE ......................... 12
» CHASSIS LAYOUT .......................................... 14
» BLOCK DIAGRAM ........................................... 16
» SCHEMATIC DIAGRAM .................................. 19
The component parts of this model are partially different
depending on their suffix symbols. Before servicing the units,
be sure to check the suffix symbol on the model label that is
applied on the back of the unit.
Example of suffix symbol:
LCD COLOUR TV
MODEL LC-20A2M
13V
3.7A, 48W
TENTATIVE
SERVICE MANUAL
LCD COLOUR TELEVISION
MODEL
CONTENTS
Page
» PARTS LIST
» PACKING OF THE SET ................................... 45
SERIAL NO.
SHARP CORPORATION
MADE IN JAPAN
SHARP CORPORATION
1
LC-20A2M
Ë ELECTRICAL PARTS .................................. 34
MAIN UNIT .................................................. 34
Y/C SEPARATION UNIT .............................. 38
TERMINAL UNIT ......................................... 40
INVERTER UNIT ......................................... 41
OPERATION UNIT ....................................... 42
Ë SUPPLIED ACCESSORIES ........................ 44
Ë PACKING PARTS ......................................... 44
X
x x x x x x x x x
Suffix "X" for Australlia
LC-20A2M
S00K2LC-20A2H
Page
N1

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Summary of Contents for Sharp LC-20A2M

  • Page 1: Table Of Contents

    Example of suffix symbol: x x x x x x x x x LCD COLOUR TV SERIAL NO. MODEL LC-20A2M SHARP CORPORATION 3.7A, 48W MADE IN JAPAN Suffix "X" for Australlia SHARP CORPORATION...

  • Page 2: Important Service Safety Precaution

    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-20A2M Specifications...

  • Page 4: Operation Manual

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

  • Page 5: Dimensions

    LC-20A2M Dimensions (Unit: mm)

  • Page 6: Removing Of Major Parts

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

  • Page 12: Adjustment Procedure

    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-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: Chassis Layout

    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 15: Block Diagram

    LC-20A2M BLOCK DIAGRAM...

  • Page 16: Description Of Schematic Diagram

    LC-20A2M DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: 1. When the exclusive-use AC adapter is used, the colour 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 17 LC-20A2M Ë OPERATION Unit...
  • Page 18 LC-20A2M Ë MAIN Unit -1/2...
  • Page 19 LC-20A2M Ë MAIN Unit -2/2...
  • Page 20 LC-20A2M Ë TERMINAL Unit...
  • Page 21 LC-20A2M Ë Y/C SEPARATION Unit...

  • Page 22: Inverter Unit

    LC-20A2M Ë INVERTER Unit...

  • Page 23: Printed Wiring Board Assemblies

    LC-20A2M PRINTED WIRING BOARD ASSEMBLIES Y/C SEPARATION Unit (Side-A) Y/C SEPARATION Unit (Side-B)

  • Page 24: Main Unit

    LC-20A2M MAIN Unit (Side-A)
  • Page 25 LC-20A2M MAIN Unit (Side-B)
  • Page 26 LC-20A2M TERMINAL Unit (Wiring Side) OPERATION Unit (Wiring Side)
  • Page 27 LC-20A2M INVERTER Unit (Wiring Side)

  • Page 28: Parts List

    LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code PARTS LIST TRANSISTORS Q201 VS2SC2712Y/-1 J 2SC2712Y Q202 VS2SC2712Y/-1 J 2SC2712Y PARTS REPLACEMENT Q203 VSFMY3/////-1 J FMY3 Replacement parts which have these special safety characteristics Q204 VS2SC2712Y/-1...
  • Page 29 LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA177FE05 C807 VCKYCY1HB331K J 330p Ceramic C808 VCKYCY1HB331K J 330p Ceramic MAIN UNIT (Continued) C809 VCEAPK1CN107M J 100 Electrolytic C810 VCKYCY1EF104Z J 0.1 Ceramic CAPACITORS C811 VCKYCY1HB331K...
  • Page 30 LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA177FE05 R206 VRS-CY1JF103F J 10k 1/16W Metal Oxide R207 VRS-CY1JF622F J 6.2k 1/16W Metal Oxide MAIN UNIT (Continued) R208 VRS-CY1JF473F J 47k 1/16W Metal Oxide R209 VRS-CY1JF123F...
  • Page 31 LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA177FE05 R917 VRS-CY1JF105J J 1.0M 1/16W Metal Oxide R918 VRS-CY1JF822F J 8.2k 1/16W Metal Oxide MAIN UNIT (Continued) R919 VRS-CY1JF822F J 8.2k 1/16W Metal Oxide R920 VRS-CY1JF822F J 8.2k 1/16W Metal Oxide...

  • Page 32: Y/C Separation Unit

    LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA177FE05 FB705 RBLN-0095CEZZ J Ferrite Bead FB706 RBLN-0051TAZZ J Ferrite Bead MAIN UNIT (Continued) FB708 RBLN-0095CEZZ J Ferrite Bead FB709 RBLN-0090CEZZ J Ferrite Bead R1220 VRS-CY1JF472J J 4.7k 1/16W Metal Oxide...
  • Page 33 LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA194DE05 C7341 VCEAPH1CN106M J 10 Electrolytic C7343 VCEAPF1CN476M J 47 Electrolytic Y/C SEPARATION UNIT (Continued) C7344 VCEAPF1CN476M J 47 Electrolytic C7345 VCEAPH1CN106M J 10 Electrolytic CAPACITORS C7347 VCEAPK1CN107M...

  • Page 34: Terminal Unit

    LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA194DE05 DUNTKA331DE01 Y/C SEPARATION UNIT (Continued) TERMINAL UNIT TUNER R7085 VRS-CY1JF102J J 1.0k 1/16W Metal Oxide NOTE: THE PARTS HERE SHOWN ARE SUPPLIED AS AN R7108 VRS-TX2HF000J...

  • Page 35: Inverter Unit

    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 36: Operation Unit

    LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA333DE01 CABINET PARTS LOCATION OPERATION UNIT CCABA2380CE07 J Front Cabinet Ass’y TRANSISTORS Not Available – Cabinet — Q4003 VSDTC144EE/-1 J DTC144EE GCOVA1808CEZZ J Cover, LED Q4005 VSDTC144EE/-1...

  • Page 37: Ë Cabinet And Mechanical Parts

    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 Operation Unit...

  • Page 38: Ë Supplied Accessories

    LC-20A2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET PARTS LOCATION SUPPLIED ACCESSORIES (Continued) PZETK0065CEZZ J Insulating Sheet CPNLS1031CE03 J Speaker Net PZETK0094CEZZ J Insulating Sheet LHLDW1028GEZZ J Cable Clamp, x2 å QCNW-5153CEZZ J Connecting Cord...

  • Page 39: Packing Of The Set

    LC-20A2M PACKING OF THE SET Accessories Operation Manual Cable Clamp Batteries Reinforcing Pad Speaker Net Wrapping Paper Caution Card Buffer Material AC Cord Reinforcing Pad Wireless Remote Conrol AC Adaptor Antenna Cable Packing Case...
  • Page 40 LC-20A2M COPYRIGHT © 2001 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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