Sharp LC-20SH4U Service Manual
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Sharp LC-20SH4U Service Manual

Sharp LC-20SH4U Service Manual

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Download this manual See also: Service Manual, Operating Manual
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, sub and R/C, LED PWB
unit as well as the LCD panel-related and other component parts have also been modified. In this respect,
these parts of this model are not interchangeable with those of previous LCD panel models in servicing.
This Service Manual covers the modified points among others.
For other technical points, refer to the Service Manual of Model LC-20SH4U (S25E5LC20SH4U).
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 number on the serial number label.
B
• The
character is also added at the end of the model number on the number label (barcode label) of the
B
packing case.
• The serial product numbers (in the 5th thru 9th digits) are 71112 and on.
» IMPORTANT SERVICE SAFETY PRECAUTION ........................................................................................ 2
» REMOVING OF MAJOR PARTS ..................................................................................................................5
» ADJUSTING PROCEDURE OF EACH SECTION ....................................................................................... 9
» TROUBLE SHOOTING TABLE ..................................................................................................................20
» BLOCK DIAGRAM ......................................................................................................................................24
» OVERALL WIRING DIAGRAM ...................................................................................................................26
» SCHEMATIC DIAGRAM
ËMAIN Unit .................................................................................................................................................28
ËSUB Unit ..................................................................................................................................................38
ËR/C, LED Unit ..........................................................................................................................................44
» PRINTED WIRING BOARD ASSEMBLIES ................................................................................................45
» REPLACEMENT PARTS LIST.................................................................................................................... 58
» PACKING OF THE SET ..............................................................................................................................69

SHARP CORPORATION

SERVICE MANUAL

SUPPLEMENT

LCD COLOR TELEVISION

LC-20SH4U
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-20SH4U
SUPPLEMENT
S85M6LC20SH4U
Page

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Summary of Contents for Sharp LC-20SH4U

  • Page 1: Table Of Contents

    LCD panel models in servicing. This Service Manual covers the modified points among others. For other technical points, refer to the Service Manual of Model LC-20SH4U (S25E5LC20SH4U). The previous LCD panel models and the new model can be identified with the following markings.

  • Page 2: Important Service Safety Precaution

    LC-20SH4U 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-20SH4U 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 conduite électrique ou une prise de terre branchée à la terre.
  • Page 4 LC-20SH4U 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-20SH4U 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 cabinet B fixing screws (13 pcs.). 4. Remove the cabinet B after opening from the direction of an arrow.
  • Page 6 LC-20SH4U SUPPLEMENT 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 7 LC-20SH4U 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 LC-20SH4U SUPPLEMENT » 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 9: Adjusting Procedure Of Each Section

    LC-20SH4U SUPPLEMENT 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 10 LC-20SH4U SUPPLEMENT [4] Initialization 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 A630A. (Adjustment Process Menu Page 1) 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 5-1.
  • Page 11 LC-20SH4U SUPPLEMENT 6-3. White balance adjustment 1) Adjustment procedure Adjust the RGB CUTOFF2 setting for white 40% first and then the RGB-GAIN setting for white 80%. (1) Adjusting the test signal [Input signal] White 80% (191 gradations) for the left of screen, and white 40% (92 gradations) for the right.
  • Page 12 LC-20SH4U SUPPLEMENT 7-2. Description of Factory Settings. Setting content/range Initial Value (AV1) (AV2) (COMPONENT1) MENU PICTURE AV MODE STANDARD/DYNAMIC/DYNAMIC(FIXED)/MOVIE/GAME DYNAMIC DYNAMIC DYNAMIC DYNAMIC ON/OFF BACKLIGHT BRIGHT/NORMAL/DARK/VARIABLE VARIABLE (STANDARD) (DYNAMIC) (DYNAMIC(FIXED) (MOVIE) (GAME) 1 (DARK) ~9 (NORMAL)~17 (BRIGHT) CONTRAST 0~60 BRIGHTNESS...
  • Page 13 LC-20SH4U SUPPLEMENT LIST OF THE ADJUSTMENT PROCESS MODE MENU " For calling the adjustment process mode and keying in this mode, refer back to ADJUSTING PROCEDURE OF " EACH SECTION ADJUSTMENT PROCESS 1st LEVEL ITEM DEFAULT TABLE Initial Response precautions on servicing Page No.
  • Page 14 N358 TV TINT TINT SETTING (TV) NOT USED N358 AV TINT TINT SETTING (COMPOSITE, S VIDEO) NOT USED N358 TV SHARP V V PICTURE QUALITY SETTING (TV) NOT USED N358 AV SHARP V V PICTURE QUALITY SETTING (COMPOSITE, S VIDEO) NOT USED...
  • Page 15 COLOR DENSITY SETTING (COMPOSITE, S VIDEO) NOT USED N443 AV TINT TINT SETTING (COMPOSITE, S VIDEO) NOT USED N443 AV SHARP V V PICTURE QUALITY SETTING (COMPOSITE, S VIDEO) NOT USED N443 AV SHARP H1 H PICTURE QUALITY SETTING 1 (COMPOSITE, S VIDEO)
  • Page 16 PAL-N TV TINT TINT SETTING (TV) NOT USED PAL-N AV TINT TINT SETTING (COMPOSITE, S VIDEO) NOT USED PAL-N TV SHARP V V PICTURE QUALITY SETTING (TV) NOT USED PAL-N AV SHARP V V PICTURE QUALITY SETTING (COMPOSITE, S VIDEO) NOT USED...
  • Page 17 NOT USED 1125I COLOR COLOR DENSITY SETTING (Component) NOT USED 1125I TINT TINT SETTING (Component) NOT USED 1125I SHARP V V PICTURE QUALITY SETTING (Component) NOT USED 1125I SHARP H1 H PICTURE QUALITY SETTING 1 (Component) NOT USED 1125I SHARP H2...
  • Page 18 LC-20SH4U SUPPLEMENT ADJUSTMENT PROCESS TUNER ITEM DEFAULT TABLE Initial Response precautions on servicing Page No. Item Function Value (Do not change other items than designated.) TUNER SETTINGS TUNER1 AFT UP 1.80 AFT VOLTAGE REFERENCE LEVEL (ALL BANDS) NOT USED AFT DOWN 1.20...
  • Page 19 LC-20SH4U SUPPLEMENT 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 20: Trouble Shooting Table

    LC-20SH4U SUPPLEMENT TROUBLE SHOOTING TABLE...
  • Page 21 LC-20SH4U SUPPLEMENT TROUBLE SHOOTING TABLE (Continued)
  • Page 22 LC-20SH4U SUPPLEMENT TROUBLE SHOOTING TABLE (Continued)
  • Page 23 LC-20SH4U SUPPLEMENT TROUBLE SHOOTING TABLE (Continued)

  • Page 24: Block Diagram

    LC-20SH4U SUPPLEMENT BLOCK DIAGRAM LCD_Panel MAIN_PWB SUB_PWB RCRSCA097WJZZ IMZ1A x 2 to Main Micon 54MHz IC1701 CVBS-in RED,GREEN,BLUE VIDEO LCD Panel Module 13pin (IXB075WJ) U/V TUNER RSDS CVBS-in CK,SP S-IF SIF AMP 40pin Y-in 42pin I2C (3.3V) IC1004 T-CON (IXB150WJ)

  • Page 25: Overall Wiring Diagram

    LC-20SH4U SUPPLEMENT OVERALL WIRING DIAGRAM...

  • Page 26: Ëmain Unit

    LC-20SH4U SUPPLEMENT ËMAIN Unit-1/5...
  • Page 27 LC-20SH4U SUPPLEMENT ËMAIN Unit-2/5...
  • Page 28 LC-20SH4U SUPPLEMENT ËMAIN Unit-3/5...
  • Page 29 LC-20SH4U SUPPLEMENT ËMAIN Unit-4/5...
  • Page 30 LC-20SH4U SUPPLEMENT ËMAIN Unit-5/5...

  • Page 31: Ësub Unit

    LC-20SH4U SUPPLEMENT ËSUB Unit-1/4...
  • Page 32 LC-20SH4U SUPPLEMENT ËSUB Unit-2/4 Note:SUB 3 does not use it.
  • Page 33 LC-20SH4U SUPPLEMENT ËSUB Unit-4/4...

  • Page 34: Ër/C, Led Unit

    LC-20SH4U SUPPLEMENT Ë R/C, LED Unit...

  • Page 35: Printed Wiring Board Assemblies

    LC-20SH4U SUPPLEMENT PRINTED WIRING BOARD ASSEMBLIES R/C, LED Unit (Wiring Side) R/C, LED Unit (Chip Parts Side)
  • Page 36 LC-20SH4U SUPPLEMENT MAIN Unit (Side-A)
  • Page 37 LC-20SH4U SUPPLEMENT R1203 R1238 Q1216 R1288 C1267 C1228 C1209 SC1701 R1243 C1269 SC2003 C1232 C1735 C1733 C1268 R1229 R1074 R1230 IC1201 C1073 R1069 R1070 C1072 C1071 R1055 C1069 C1070 C1068 R1054 C1067 R1285 R1284 C1066 C1065 R1053 R1276 C1063 IC1004...
  • Page 38 LC-20SH4U SUPPLEMENT MAIN Unit (Side-B)
  • Page 39 LC-20SH4U SUPPLEMENT TL1708 TL1714 TL1720 TL1744 TL1701 TL1726 TL1732 TL1736 TL1750 TL1705 TL1711 TL1715 TL1721 TL1727 TL1733 TL1741 TL1745 TL1754 TL1751 TL2032 TL1704 TL1716 TL1722 TL1728 TL1734 TL1739 TL1746 TL1702 TL1710 R2011 TL1748 TL1718 TL1724 TL1730 C1734 TL1707 TL1713 TL1737...
  • Page 40 LC-20SH4U SUPPLEMENT SUB Unit (Wiring Side)
  • Page 41 LC-20SH4U SUPPLEMENT SUB Unit (Chip Parts Side)

  • Page 42: Replacement Parts List

    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 43 LC-20SH4U SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD035WEF9 C3925 VCCCCY1HH101JY J 100p Ceramic C3926 VCKYTV1CB105KY J 1 Ceramic SUB Unit (Continued) C3927 VCKYTV1CB105KY J 1 Ceramic C5001 VCCCCY1HH101JY J 100p Ceramic D3922 RH-EX1271CEZZY J Zener Diode...
  • Page 44 LC-20SH4U SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD035WEF9 R7753 VRS-CY1JF000JY 1/16W Metal Oxide R7754 VRD-RA2BE102JY J 1k 1/8W Carbon SUB Unit (Continued) R7755 VRS-CY1JF103JY J 10k 1/16W Metal Oxide R7757 VRS-CY1JF272JY J 2.7k 1/16W Metal Oxide...
  • Page 45 LC-20SH4U SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD037WEF9 DUNTKD327FMF9 R/C, LED Unit MAIN Unit TRANSISTORS TUNER NOTE: THE PARTS HERES SHOWN ARE SUPPLIED AS AN Q4001 VSKRC104S//-1Y J KRC104S ASSEMBLY BUT NOT INDEPENDENTLY.
  • Page 46 LC-20SH4U SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code C1073 VCKYCZ1AB333KY J 0.033 10V Ceramic DUNTKD327FMF9 C1074 VCKYCZ1AB333KY J 0.033 10V Ceramic MAIN Unit (Continued) C1075 VCKYCZ1AB333KY J 0.033 10V Ceramic C1076 VCKYCZ1AB333KY J 0.033 10V Ceramic C1077 VCKYCZ1AB333KY J 0.033 10V...
  • Page 47 LC-20SH4U SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code RESISTORS DUNTKD327FMF9 R1002 VRS-CY1JF223JY J 22k 1/16W Metal Oxide MAIN Unit (Continued) R1015 VRS-CY1JF000JY 1/16W Metal Oxide R1017 VRS-CY1JF000JY 1/16W Metal Oxide C1322 VCEASX0JN107MY J 100 6.3V Electrolytic...
  • Page 48 LC-20SH4U SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD327FMF9 R1331 VRS-CY1JF102JY J 1k 1/16W Metal Oxide R1332 VRS-CY1JF103JY J 10k 1/16W Metal Oxide MAIN Unit (Continued) R1333 VRS-CY1JF331JY J 330 1/16W Metal Oxide R1334 VRS-TV1JD102JY...
  • Page 49 LC-20SH4U SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD327FMF9 MAIN Unit (Continued) FB1003 RBLN-0006TAZZY J Ferrite Bead FB1005 RBLN-0006TAZZY J Ferrite Bead FB1006 RBLN-0006TAZZY J Ferrite Bead FB1007 RBLN-0083GEZZY J Ferrite Bead FB1300 RBLN-0035TAZZY...

  • Page 50: Cabinet And Mechanical Parts

    LC-20SH4U SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code XHPS730P08WS0 J Screw, x7 CABINET AND MECHANICAL PARTS XEBSN40P12000 J Screw, x8 LHLDZA555WJZZ J LED Holder PSLDMA800WJFW J Back Shield CCABAB121WJ01 J Cabinet A Ass’y Not Available –...
  • Page 51 LC-20SH4U SUPPLEMENT CABINET AND MECHANICAL PARTS Operation PWB R/C, LED PWB 5-10 5-11 5-10 Inverter PWB Sub PWB Main PWB...

  • Page 52: Packing Parts

    LC-20SH4U SUPPLEMENT Ref. No. Part No. Description Code Ref. No. Part No. Description Code PACKING PARTS SUPPLIED ACCESSORIES (NOT REPLACEMENT ITEM) SPAKCC262WJZZ – Packing Case — QACCDA038WJPZ J AC Cord å SPAKPA582WJZZ – Wrapping Paper — RRMCGA367WJSA J Wireless Remote Control SPAKXA860WJZZ –...

  • Page 53: Packing Of The Set

    LC-20SH4U SUPPLEMENT PACKING OF THE SET X3, X4, X5, X6...
  • Page 54 LC-20SH4U 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.

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