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Sharp LC-20S4U-S Service Manual Supplement
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Sharp LC-20S4U-S Service Manual Supplement

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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.
The LCD panel of this model has been redesigned. With this redesign, the main and analog PWB unit as well
as the LCD panel-related and other mechanical parts have also been modified and these parts are not
interchangeable with those of previous LCD panel models in servicing.
This Supplement covers the modified points from the previous Supplement.
For other technical points, refer to the Service Manual for previous LCD panel model LC-20S4U-S
(S2F1LC20S4US) as well as the Supplement for LC-20S4U-S (S65K1LC20S4US).
The previous LCD panel models and the new model can be identified with the following markings.
• The
character is added at the end of the model name on the model label.
B
• The
character is also added at the end of the model name on the number label (barcode label) of the
B
packing case.
• The serial product numbers (in the 5th thru 9th digits) are 81112 and on.
» IMPORTANT SERVICE SAFETY PRECAUTION .........................................................................................2
» REMOVING OF MAJOR PARTS ..................................................................................................................5
» OVERALL WIRING DIAGRAM .....................................................................................................................8
ËMAIN Unit .................................................................................................................................................10
ËANALOG Unit ...........................................................................................................................................22
» REPLACEMENT PARTS LIST.................................................................................................................... 30
» PACKING OF THE SET ..............................................................................................................................39
SHARP CORPORATION
SERVICE MANUAL
SUPPLEMENT
LCD COLOR TELEVISION
LC-20S4U-S
MODEL
OUTLINE
CONTENTS
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
LC-20S4U-S
SUPPLEMENT
S05P1LC20S4US
Page

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Summary of Contents for Sharp LC-20S4U-S

  • Page 1: Table Of Contents

    LCD panel models in servicing. This Supplement covers the modified points from the previous Supplement. For other technical points, refer to the Service Manual for previous LCD panel model LC-20S4U-S (S2F1LC20S4US) as well as the Supplement for LC-20S4U-S (S65K1LC20S4US).

  • Page 2: Important Service Safety Precaution

    LC-20S4U-S SUPPLEMENT 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: • Use an AC voltmeter having with 5000 ohm per volt, or...
  • Page 3 LC-20S4U-S SUPPLEMENT PRECAUTIONS A PRENDRE LORS DE LA REPARATION Ë La réparation ne peut être effectuée que par un technicien spécialisé qui s'est parfaitement accoutumé à toute vérification de sécurité et aux conseils suivants. AVERTISSEMENT exposées du coffret et une terre connue comme une conduite électrique ou une prise de terre branchée à...
  • Page 4 LC-20S4U-S SUPPLEMENT Precautions for using lead-free solder 1 Employing lead-free solder "All 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 5: Removing Of Major Parts

    LC-20S4U-S SUPPLEMENT REMOVING OF MAJOR PARTS 1. Remove the stand cover fixing screws (1 pc.) 2. Remove the stand fixing screws (4 pcs.). 3. Remove the carrying handle fixing screws (4 pcs.). 4. Remove the terminal covers (left and right).
  • Page 6 LC-20S4U-S SUPPLEMENT 10. Remove the 3 lock screws from the main PWB, and undo the claws a and b. Detach the main PWB by lifting the area around the claws and pulling the PWB out. 11. Remove the 3 lock screws from the analog PWB, and undo the claws c and d. Detach the chassis frame (right) from the analog PWB by pulling out the terminals.
  • Page 7 LC-20S4U-S SUPPLEMENT » 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 8: Overall Wiring Diagram

    LC-20S4U-S SUPPLEMENT OVERALL WIRING DIAGRAM...

  • Page 9: Schematic Diagram

    LC-20S4U-S SUPPLEMENT SCHEMATIC DIAGRAM ËMAIN Unit-1/6...
  • Page 10 LC-20S4U-S SUPPLEMENT ËMAIN Unit-2/6...
  • Page 11 LC-20S4U-S SUPPLEMENT ËMAIN Unit-3/6...
  • Page 12 LC-20S4U-S SUPPLEMENT ËMAIN Unit-4/6...
  • Page 13 LC-20S4U-S SUPPLEMENT ËMAIN Unit-5/6...
  • Page 14 LC-20S4U-S SUPPLEMENT ËMAIN Unit-6/6...
  • Page 15 LC-20S4U-S SUPPLEMENT ËANALOG Unit-1/4...
  • Page 16 LC-20S4U-S SUPPLEMENT ËANALOG Unit-2/4...
  • Page 17 LC-20S4U-S SUPPLEMENT ËANALOG Unit-3/4...
  • Page 18 LC-20S4U-S SUPPLEMENT ËANALOG Unit-4/4...

  • Page 19: Ëmain Unit

    2. NO. DE REF 3. NO. DE PIECE 4. DESCRIPTION in USA: Contact your nearest SHARP Parts Distributor to order. For in CANADA: Contact SHARP Electronics of Canada Limited location of SHARP Parts Distributor, Please call Toll-Free; Phone (416) 890-2100...
  • Page 20 LC-20S4U-S SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD234FE21 C820 VCKYCY1CB104KY J 0.1 Ceramic C821 VCKYCZ1AB104KY J 0.1 Ceramic MAIN Unit (Continued) C822 VCKYCZ1AB104KY J 0.1 Ceramic C823 VCKYCZ1AB104KY J 0.1 Ceramic C824 VCKYCY1HB104KY J 0.1 Ceramic X2001 RCRSC0032TAZZY J Crystal, 32.768kHz...
  • Page 21 LC-20S4U-S SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD234FE21 R721 VRS-CY1JF223JY J 22k 1/16W Metal Oxide R722 VRS-CY1JF223JY J 22k 1/16W Metal Oxide MAIN Unit (Continued) R723 VRS-CY1JF243FY J 24k 1/16W Metal Oxide R724...
  • Page 22 LC-20S4U-S SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD234FE21 R2033 VRS-CY1JF101JY J 100 1/16W Metal Oxide R2034 VRS-CY1JF153JY J 15k 1/16W Metal Oxide MAIN Unit (Continued) R2035 VRS-CY1JF223JY J 22k 1/16W Metal Oxide R2036 VRS-CY1JF101JY...

  • Page 23: Ëanalog Unit

    LC-20S4U-S SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD084WE06 L7005 VPCNN220J2R9NY J Peaking 22µH L7006 VPCNN220J2R9NY J Peaking 22µH ANALOG Unit L7007 VPCNN220J2R9NY J Peaking 22µH L7008 VPCNN5R6J1R2NY J Peaking 5.6µH TUNER L7009 VPCNN100J1R6NY J Peaking 10µH L7010 VPCNN100J1R6NY J Peaking 10µH...
  • Page 24 LC-20S4U-S SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD084WE06 R3304 VRS-CY1JF222JY J 2.2k 1/16W Metal Oxide R3305 VRS-CY1JF222JY J 2.2k 1/16W Metal Oxide ANALOG Unit (Continued) R3306 VRS-CY1JF000JY 1/16W Metal Oxide R3307 VRS-CY1JF000JY 1/16W Metal Oxide...
  • Page 25 LC-20S4U-S SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD084WE06 CABINET AND MECHANICAL PARTS ANALOG Unit (Continued) CCABAB220WJ01 X Cabinet A Ass’y R3705 VRS-CY1JF102JY J 1k 1/16W Metal Oxide Not Available – Cabinet A —...
  • Page 26 LC-20S4U-S SUPPLEMENT CABINET AND MECHANICAL PARTS R/C, LED PWB 4-10 4-11 2-11 4-10 2-10 Operation PWB Main PWB Inverter PWB Analog PWB...
  • Page 27 LC-20S4U-S SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET AND MECHANICAL PARTS PACKING PARTS (Continued) (NOT REPLACEMENT ITEM) SPAKCB853WJZZ – Packing Case — XEBSN30P08000 J Screw, x2 SPAKFA791WJZZ – Packing Case, for Accessory —...

  • Page 28: Packing Of The Set

    LC-20S4U-S SUPPLEMENT PACKING OF THE SET S2/S3...
  • Page 29 LC-20S4U-S SUPPLEMENT 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.