Sharp LC-20E1U Service Manual
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Sharp LC-20E1U Service Manual

Sharp LC-20E1U Service Manual

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See also: 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.
» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................... 2
» SPECIFICATIONS ................................................................................................................................... 5
» OPERATION MANUAL ............................................................................................................................ 6
» DIMENSIONS .......................................................................................................................................... 9
» REMOVING OF MAJOR PARTS ........................................................................................................... 10
» ADJUSTING PROCEDURE OF EACH SECTION ................................................................................ 14
» TROUBLE SHOOTING TABLE ............................................................................................................. 26
» CHASSIS LAYOUT ................................................................................................................................ 30
» BLOCK DIAGRAM ................................................................................................................................. 32
» OVERALL WIRING DIAGRAM .............................................................................................................. 34
» DESCRIPTION OF SCHEMATIC DIAGRAM ........................................................................................ 36
» SCHEMATIC DIAGRAM ........................................................................................................................ 37
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................... 54
» REPLACEMENT PARTS LIST .............................................................................................................. 66
» PACKING OF THE SET ......................................................................................................................... 79

SHARP CORPORATION

SERVICE MANUAL

LCD COLOR TELEVISION

LC-20E1U
LC-20E1UB/UW
MODELS
CONTENTS
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
LC-20E1U
LC-20E1UB/UW
S72M5LC-20E1U
Page

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  • Page 1: Table Of Contents

    LC-20E1U LC-20E1UB/UW SERVICE MANUAL S72M5LC-20E1U LCD COLOR TELEVISION LC-20E1U LC-20E1UB/UW MODELS 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-20E1U LC-20E1UB/UW IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be perfomed only by qualified service technicians who are thor- oughly familiar with all safety checks and the servicing guidelines which follow: ground, such as electrical conduit or electrical ground WARNING connected to an earth ground.
  • Page 3 LC-20E1U LC-20E1UB/UW 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. conduite électrique ou une prise de terre branchée à la AVERTISSEMENT terre.
  • Page 4 LC-20E1U LC-20E1UB/UW 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: Specifications

    LC-20E1U LC-20E1UB/UW SPECIFICATIONS Items LC-20E1U Model LCD panel 19.7” ASV & BLACK-TFT LCD Number of dots 921,600 dots VGA Video color systems N358, N443, PAL, PAL-M, PAL-N, SECAM, PAL-60 Destination USA/Latin A/Twn TV Standard (CCIR) NTSC/PAL-M/PAL-N TV function TV Tuning System PLL 181 ch.

  • Page 6: Operation Manual

    LC-20E1U LC-20E1UB/UW OPERATION MANUAL...
  • Page 7 LC-20E1U LC-20E1UB/UW...
  • Page 8 LC-20E1U LC-20E1UB/UW...

  • Page 9: Dimensions

    LC-20E1U LC-20E1UB/UW DIMENSIONS Unit: inch/(mm) MENU TV/VIDEO MAIN POWER (493) (103) POWER SLEEP (68) (182) (100) VIDEO AV-IN 1 AUDIO VIDEO S-VIDEO AV-IN 2/OUT AUDIO HEAD PHONE COMPONENT ANT. AUDIO POWER INPUT DC13V...

  • Page 10: Removing Of Major Parts

    LC-20E1U LC-20E1UB/UW REMOVING OF MAJOR PARTS 1. Remove the table stand fixing screws (4 pcs.). 2. Remove the two terminal covers. 3. Remove the terminal section fixing screws (2 pcs.). 4. Remove the cabinet B fixing screws (10 pcs.). 5. Remove the cabinet B after opening from the direction of an arrow.
  • Page 11 LC-20E1U LC-20E1UB/UW 10. Remove the inverter-A PWB fixing screws (2 pcs.). 11. Remove the inverter-B PWB fixing screws (1 pc.). 12. Remove the digital PWB fixing screws (3 pcs.). 13. Remove the analog PWB fixing screws (3 pcs.) and detatch the chassis frame cover fixing hooks.
  • Page 12 LC-20E1U LC-20E1UB/UW » 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 13 LC-20E1U LC-20E1UB/UW Precautions at the time of the side B(back) service of digital unit. 1. Remove only SC2001 of the FFC for connection between Digital unit(SC2001) and Analog unit(SC3403), and connect the extended cable (QCNW-A556WJZZ) for service. 2. Remove only P2004 of the Connecting Cord for connection between Digita unit(P2004) and Analog unit(P3702), and connect the extended cable (QCNW-A552WJZZ) for service.

  • Page 14: Adjusting Procedure Of Each Section

    LC-20E1U LC-20E1UB/UW ADJUSTING PROCEDURE OF EACH SECTION The best adjustment is made before shipping. If any position deviation is found or after part replace is performed, adjust as follows. 1. Preparation for Adjustments (1)Use the exclusive-use AC adapter or stable DC power supply.
  • Page 15 LC-20E1U LC-20E1UB/UW 4. Adjustments Adjustment Adjusting conditions Adjusting method 1. Adjust the "B+ Adj" value to 1. Connect the DC voltmeter to B+ Adjustment pin 2 of P3702. 5.0±0.02V with R3760. Make exact (R3760) adjustment of the 5.00V level be- cause it will be the reference for all the other supply voltages.
  • Page 16 LC-20E1U LC-20E1UB/UW 5. Shipping setting list Channel ............................... 2ch Air/Cable ............................. Air Skip Data_CATV ..........................All Skip Skip Data_AIR ............................ All Skip Volume ..............................20 Picture ..............................30 Tint ..............................0 Color ..............................0 Black Level ............................0 SHARPNESS ............................0 RED-BLUE ............................
  • Page 17 LC-20E1U LC-20E1UB/UW Test patterns in adjustment process mode [1] IC801 (Video decoder) test patterns 1-1. Getting the test patterns displayed Put the screen in AV1, AV2 or COMPONENT but keep out any signal. Call the adjustment process mode, select “TEST PATTERN” in the 3rd line of page 8, make the settings 1 thru 6, and the following test patterns show up.
  • Page 18 LC-20E1U LC-20E1UB/UW Pin functions of microprocessor IC (IC2001) RH-iXA300WJZZQ Pin name Function Pin name Function V HOLD Closed caption Adjustment process Closed caption AV/SY/DY2 US CCD input select MAIN SW FSMUTE Main switch ON[H]/OFF[L] Front mute TIMELED RSMUTE Off timer LED light-up...
  • Page 19 LC-20E1U LC-20E1UB/UW Adjustment process mode menus at a glance Page Item Initial setting Function Adjust/modify Basic settings MODEL Model number INCH SIZE Inch unit select Adjustment SYSTEM N358 Color system select NTSC PWN FREQ Dimmer frequency setting PAL PWM FREQ...
  • Page 20 LC-20E1U LC-20E1UB/UW Page Item Initial setting Function Adjust/modify MDB Zone restriction HPF cutoff frequency MDB Zone restriction LPF cutoff frequency EXT GEQ BAND1 +1.0 Equalizer setting 1 (external input) EXT GEQ BAND2 –1.0 Equalizer setting 2 (external input) EXT GEQ BAND3...
  • Page 21 LC-20E1U LC-20E1UB/UW Page Item Initial setting Function Adjust/modify N358 TV LDLY Y/C phase setting (TV) N358 AV LDLY Y/C phase setting (composite, S video) N443 AV COLOR 2500 Color density setting (composite, S video) N443 AV TINT Color tone setting (composite, S video)
  • Page 22 LC-20E1U LC-20E1UB/UW Page Item Initial setting Function Adjust/modify Search AFT reference settings & LCD controller settings AFT UP AFT reference voltage AFT DOWN AFT reference voltage NTSC 01 Initial settings NTSC 02 Various settings NTSC 03 RCUTOFF NTSC 04 GCUTOFF...
  • Page 23 LC-20E1U LC-20E1UB/UW Page Item Initial setting Function Adjust/modify Gradation & COM settings V255 Gradation power reference voltage V255 BIAS Gradation power reference voltage V235 Gradation power reference voltage V235 BIAS Gradation power reference voltage V176 Gradation power reference voltage V176 BIAS...
  • Page 24 LC-20E1U LC-20E1UB/UW PUBLIC MODE 1. Outline The Public mode is designed to limit the functions of LCD TV sets that are set up at hotels, public places (hospitals, for example), shop fronts and similar locations. Note: In the Public mode, some user settings may fail to be changed later. The Closed Caption, V-Chip, MTS and some other functions, as well as the volume control must be preset before getting the TV set into the Public mode.
  • Page 25 LC-20E1U LC-20E1UB/UW Item Default Setting Function MAXIMUM VOLUME 1~60 Sets the highest sound volume level. (The volume level is expressed in digital form only.) VOLUME FIXED VARIABLE VARIABLE Makes the sound volume adjustable. FIXED Keeps the sound volume fixed. (The sound volume is fixed at the then level. The Volume and Mute characters are not displayed onscreen.)

  • Page 26: Trouble Shooting Table

    LC-20E1U LC-20E1UB/UW TROUBLE SHOOTING TABLE...
  • Page 27 LC-20E1U LC-20E1UB/UW TROUBLE SHOOTING TABLE (Continued)
  • Page 28 LC-20E1U LC-20E1UB/UW TROUBLE SHOOTING TABLE (Continued)
  • Page 29 LC-20E1U LC-20E1UB/UW TROUBLE SHOOTING TABLE (Continued)

  • Page 30: Chassis Layout

    LC-20E1U LC-20E1UB/UW CHASSIS LAYOUT INVBERTER-A Unit CONTROL Unit DIGITAL Unit ANALOG Unit INVBERTER-B Unit R/C, LED Unit...

  • Page 31: Block Diagram

    LC-20E1U LC-20E1UB/UW BLOCK DIAGRAM ANALOG UNIT DIGITAL UNIT TV-V TUNER Y and C 3D Y/C REGULATOR SYOUT, SCOUT YO, CO TU3201 SWITCH SEPARATOR IC7102 IC7101 IC7001 IC7701 SIF-AMP. IC7002 Q3201 Q3202 V1SY,V1SC RESET SY, SC IC7004 S-VIDEO INPUT L1, R1...

  • Page 32: Overall Wiring Diagram

    LC-20E1U LC-20E1UB/UW OVERALL WIRING DIAGRAM...

  • Page 33: Description Of Schematic Diagram

    LC-20E1U LC-20E1UB/UW DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: 1. The voltages at test points are measured on exclusive AC adaptor and the stble supply voltage of AC 120V. Signals are fed by a color bar signal generator for servicing purpose and the above voltages are measured with a 20k ohm/V tester.

  • Page 34: Schematic Diagram

    LC-20E1U LC-20E1UB/UW SCHEMATIC DIAGRAM Ë R/C, LED and CONTROL Unit R/C, LED...
  • Page 35 LC-20E1U LC-20E1UB/UW Ë DIGITAL Unit-1/5...
  • Page 36 LC-20E1U LC-20E1UB/UW Ë DIGITAL Unit-2/5...
  • Page 37 LC-20E1U LC-20E1UB/UW Ë DIGITAL Unit-3/5...
  • Page 38 LC-20E1U LC-20E1UB/UW Ë DIGITAL Unit-4/5...
  • Page 39 LC-20E1U LC-20E1UB/UW Ë DIGITAL Unit-5/5...
  • Page 40 LC-20E1U LC-20E1UB/UW Ë ANALOG Unit-1/2...
  • Page 41 LC-20E1U LC-20E1UB/UW Ë ANALOG Unit-2/2...
  • Page 42 LC-20E1U LC-20E1UB/UW Ë INVERTER-A Unit...
  • Page 43 LC-20E1U LC-20E1UB/UW Ë INVERTER-B Unit...

  • Page 44: Printed Wiring Board Assemblies

    LC-20E1U LC-20E1UB/UW PRINTED WIRING BOARD ASSEMBLIES DIGITAL Unit (Side-A)
  • Page 45 LC-20E1U LC-20E1UB/UW FB7003 FL7004 C7047 C7122 D7701 SC2001 R7023 R7024 R7025 C7105 C7046 R417 R418 IC7201 C7203 C7053 R7204 C703 C7201 R423 IC7001 C7202 IC402 R424 C7005 D2002 C410 R7003 R7112 D2003 C2021 R2050 C7101 FL7001 C7027 R7001 C7059 R7106...
  • Page 46 LC-20E1U LC-20E1UB/UW DIGITAL Unit (Side-B)
  • Page 47 LC-20E1U LC-20E1UB/UW IC7102 IC7002 IC7701 R7704 R7047 R717 R719 L7003 C7021 R7053 R716 C7020 R7038 C7062 C7018 R7040 C7017 C7032 C7004 C7058 C7041 C7014 C7060 C7013 L7002 C7061 R7002 R7104 R7103 R7007 R7035 R7006 Q7002 R7008 Q7102 Q7101 R7009 R7101...
  • Page 48 LC-20E1U LC-20E1UB/UW R/C, LED Unit (Side-A) D4022 R4023 Q4004 D4012 Q4007 R4032 R4024 D4014 D4015 R4029 R/C, LED Unit (Chip Parts Side-A) CONTROL Unit (Side-A) (QPWBSB413WJZZ) CONTROL Unit (Chip Parts Side-A) (QPWBSB413WJZZ)
  • Page 49 LC-20E1U LC-20E1UB/UW ANALOG Unit (Side-A)
  • Page 50 LC-20E1U LC-20E1UB/UW P3704 P3602 P3601 P3500 P3502 P3501 R3756 D3602 C3607 D3601 R3757 R3701 R3605 C3606 Q3602 C3603 C3605 R3604 R3608 R3607 C3602 C3604 C3700 C3601 Q3601 C3600 D3703 R3718 D3607 C3608 FB3701 C3609 C3711 C3713 R3721 R3720 D3608 FB3709...
  • Page 51 LC-20E1U LC-20E1UB/UW INVERTER-A Unit (Side-A)
  • Page 52 LC-20E1U LC-20E1UB/UW Q6706 Q6708 T6705 Q6707 R6722 D6700 Q6704 R6721 R6720 Q6705 Q6703 T6704 C6707 R6704 T6703 T6702 R6703 R6702 C6703 R6701 Q6701 R6700 Q6700 C6702 T6701 T6700 INVERTER-A Unit (Chip Parts Side-A)
  • Page 53 LC-20E1U LC-20E1UB/UW INVERTER-B Unit (Side-A)
  • Page 54 LC-20E1U LC-20E1UB/UW T6709 T6708 T6707 Q6714 T6706 D6701 C6718 R6715 R6714 INVERTER-B Unit (Chip Parts Side-A)

  • Page 55: Replacement Parts List

    4. DESCRIPTION in USA: Contact your nearest SHARP Parts Distributor to order. in CANADA: Contact SHARP Electronics of Canada 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 56 LC-20E1U LC-20E1UB/UW Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE29 L803 VP-9N3R3KR46NY J Peaking 3.3µH L804 RCiLC0055CEZZY J Coil DIGITAL UNIT (Continued) L805 RCiLC0055CEZZY J Coil L1201 VP-1M470J5R4NY J Peaking 47µH IC7201 VHiMM1031XM-1Y J MM1031XMR...
  • Page 57 LC-20E1U LC-20E1UB/UW Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE29 C2002 VCCCCY1HH221JY J 220p Ceramic C2003 VCKYTV1AB105KY J 1 Ceramic DIGITAL UNIT (Continued) C2007 VCKYCY1EF104ZY J 0.1 Ceramic C2009 VCKYCY1EF104ZY J 0.1 Ceramic C1109 VCKYCY1EF104ZY J 0.1 Ceramic C2010 VCKYCY1EF104ZY J 0.1...
  • Page 58 LC-20E1U LC-20E1UB/UW Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE29 R1019 VRS-CY1JF473JY J 47k 1/16W Metal Oxide R1020 VRS-CY1JF472JY J 4.7k 1/16W Metal Oxide DIGITAL UNIT (Continued) R1021 VRS-TW2ED102JY J 1k 1/4W Metal Oxide R1022 VRS-CY1JF000JY...
  • Page 59 LC-20E1U LC-20E1UB/UW Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE29 R2029 VRS-CY1JF223JY J 22k 1/16W Metal Oxide R2030 VRS-CA1JF333JY J 33k 1/16W Metal Oxide DIGITAL UNIT (Continued) R2033 VRS-CB1JF101JY J 100 1/16W Metal Oxide R2041 VRS-CY1JF101JY...
  • Page 60 LC-20E1U LC-20E1UB/UW Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE29 DUNTKB412DE03 DIGITAL UNIT (Continued) ANALOG UNIT TUNER R7701 VRS-CY1JF103JY J 10k 1/16W Metal Oxide R7702 VRS-CY1JF332JY J 3.3k 1/16W Metal Oxide NOTE: THE PARTS HERE SHOWN ARE SUPPLIED AS AN R7703 VRS-CY1JF332JY J 3.3k 1/16W Metal Oxide...
  • Page 61 LC-20E1U LC-20E1UB/UW Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB412DE03 C3367 VCEAPF1CN106MY J 10 Electrolytic C3368 VCEAPF1CN106MY J 10 Electrolytic ANALOG UNIT (Continued) C3369 RC-EZ1274CEZZ J 1000 Electrolytic C3370 VCKYTV1CF105ZY J 1 Ceramic COILS C3371 VCEA4A1CN228M...
  • Page 62 LC-20E1U LC-20E1UB/UW Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB412DE03 R3432 VRS-CY1JF000JY 1/16W Metal Oxide R3433 VRS-CY1JF000JY 1/16W Metal Oxide ANALOG UNIT (Continued) R3434 VRS-CY1JF103JY J 10k 1/16W Metal Oxide R3523 VRS-CY1JF103JY J 10k 1/16W Metal Oxide R3204 VRS-CY1JF152JY J 1.5k 1/16W Metal Oxide...

  • Page 63: Control Unit

    LC-20E1U LC-20E1UB/UW Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB413DE03 DUNTKB413DE03 ANALOG UNIT (Continued) CONTROL UNIT DIODES R3752 VRS-CY1JF102JY J 1k 1/16W Metal Oxide R3753 VRS-TX2HF000JY 1/2W Metal Oxide D4008 RH-EX1283CEZZY J Zener Diode, 18V...
  • Page 64 LC-20E1U LC-20E1UB/UW Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB414DE03 DUNTKB416DE01 R/C, LED UNIT INVERTER-A UNIT TRANSISTORS TRANSISTORS Q4003 VSDTC144EE/-1Y J DTC144EE Q6700 VSFZT1053A/-1Y J FZT1053A Q4004 VSDTC144EE/-1Y J DTC144EE Q6701 VSFZT1053A/-1Y J FZT1053A Q4007 VSUMG4N++++-1Y J UMG4N++++...

  • Page 65: Cabinet And Mechanical Parts

    XESSN40P10000 J Screw, x8 FH6707 QFSHD1002CEZZ J Fuse Holder FH6708 QFSHD1002CEZZ J Fuse Holder CCOVAA084WJ01 J Top Cover Ass'y(LC-20E1U) AR FH6709 QFSHD1002CEZZ J Fuse Holder CCOVAA084WJ02 J Top Cover Ass'y P6703 QPLGN0155FJZZY J Plug, 3-pin (LC-20E1UB) P6704 QPLGN0155FJZZY J Plug, 3-pin...
  • Page 66 LC-20E1U LC-20E1UB/UW CABINET AND MECHANICAL PARTS Control PWB Inverter-A PWB 1-12 1-13 Digital PWB Inverter-B 1-11 1-10 R/C, LED PWB 1-13 1-12 Analog PWB 5-20 5-10 5-11 5-20 5-19 5-12 5-19 5-17 5-16 5-19 5-21 5-18 5-19 5-15 5-14 5-13...

  • Page 67: Supplied Accessories

    TLABK0001TAZZ – No. Label — QCNW-6058CEZZ J Connecting Cord PMLT-0404CEZZ J Spacer, x1 PMLT-0405CEZZ J Spacer, x1 TLABNA061WJZZ J Serial No. Label(LC-20E1U) AE TLABNA126WJZZ J Serial No. Label (LC-20E1UB) TLABNA127WJZZ J Serial No. Label (LC-20E1UW) LX-BZ3442CEFF J Screw, x4 (LC-20E1U/UB)

  • Page 68: Packing Of The Set

    LC-20E1U LC-20E1UB/UW PACKING OF THE SET Operation Manual Polyethylene Bag (TiNS-A158WJZZ) (SSAKA0160CEZZ) Cable Clamp (LHLDW0109CESA : LC-20E1U/UW) (LHLDW0109CESB : LC-20E1UB) "AAA" size Battery (2pcs) Buffer Material (Top) (SPAKFA014WJZZ) Wrapping Paper (SPAKPA077WJZZ) Buffer Material (Partition) AC Cord (SPAKFA093WJZZ) (QACCD3097CEPA) Antenna Cable...
  • Page 69 LC-20E1U LC-20E1UB/UW COPYRIGHT © 2002 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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