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Sharp LC-20B1U Service Manual

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Download this manual 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.
PRECAUTION.................................................... 2
» SPECIFICATIONS ............................................. 5
» OPERATION MANUAL ...................................... 6
» DIMENSIONS .................................................... 8
» REMOVING OF MAJOR PARTS ....................... 9
EACH SECTION .............................................. 13
» TROUBLE SHOOTING TABLE ....................... 24
» CHASSIS LAYOUT .......................................... 30
» BLOCK DIAGRAM ........................................... 32
Ë CONTROL and RC/LED UNIT .................. 35
Ë DIGITAL UNIT ............................................ 36
Ë ANALOG UNIT .......................................... 46
SHARP CORPORATION
SERVICE MANUAL
LCD COLOR TELEVISION
POW ER
SLE EP
MODEL
CONTENTS
Page
LC-20B1U
Ë INVERTER-A UNIT .................................... 50
Ë INVERTER-B UNIT .................................... 51
Ë ELECTRICAL PARTS ................................ 56
Ë DIGITAL UNIT ............................................ 56
Ë ANALOG UNIT .......................................... 61
Ë CONTROL UNIT ........................................ 64
Ë RC/LED UNIT ............................................ 64
Ë INVERTER-A UNIT .................................... 65
Ë INVERTER-B UNIT .................................... 65
Ë ACCESSORIES PARTS ............................ 68
Ë PACKING PARTS ...................................... 68
» PACKING OF THE SET ................................... 69
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
LC-20B1U
S52i8LC-20B1U
Page

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Summary of Contents for Sharp LC-20B1U

  • Page 1: Table Of Contents

    LC-20B1U SERVICE MANUAL S52i8LC-20B1U LCD COLOR TELEVISION POW ER SLE EP LC-20B1U 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-20B1U 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-20B1U 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...
  • Page 4 LC-20B1U Precautions for using lead-free solder 1 Employing lead-free solder "Digital PWB" 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

    Enviromental conditions 0-40°C As a part of policy of continuous improvement, SHARP reserves the right to make design and specification changes for product improvement without prior notice. The performance specification figures indicated are nominal values of production units. There may be some deviations from these values in individual units.

  • Page 6: Operation Manual

    LC-20B1U Operation Manual...
  • Page 7 LC-20B1U...

  • Page 8: Dimensions

    LC-20B1U Dimensions MENU TV/VIDEO MAIN POWER / 319 / 630 / 401.3 / 379 / 107.3 / 72.6 / 40 VIDEO AV-IN1 AUDIO VIDEO S-VIDEO AV-IN 2/OUT AUDIO HEAD PHONE COMPONENT ANT. / 100 AUDIO POWER INPUT DC12V / 30.5 / 163.9...

  • Page 9: Removing Of Major Parts

    LC-20B1U REMOVING OF MAJOR PARTS 1. Remove the two back covers. 2. Remove the table stand fixing screws (4 pcs.). 3. Rear cabinet is detached opening some rear cabinet and shifting to a PC card slot side, where a card release button is pushed in.
  • Page 10 LC-20B1U 7. Remove the digital PWB fixing screws (1 pcs.). 8. Remove the inverter-A PWB fixing screws (2 pcs.). 9. Remove the inverter-B PWB fixing screws (1 pc.). 10. Undo the hooks and slide the chassis frame cover out of position.
  • Page 11 LC-20B1U » 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 12 LC-20B1U Notes at the time of the side B(back) service of a digital unit 1. Remove PC card slot attachment angle fixed screws(2 pcs.). 2. Remove the FFC from a PC card unit. 3. Remove the grounding cable fixed screws(2 pcs.).

  • Page 13: Adjusting Procedure Of Each Section

    LC-20B1U 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 14 LC-20B1U 4. Adjustments Adjustment Adjusting conditions Adjusting method 1 B+ Adjustment 1. Connect the DC voltmeter to 1. Adjust the "B+ Adj" value to (R3760) pin 2 of P3702. 5.0 ±0.02V with R3760. Make exact adjustment of the 5.00 V level be- cause it will be the reference for all the other supply voltages.
  • Page 15 LC-20B1U 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 16 LC-20B1U 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 7, make the settings 1 thru 6, and the following test patterns show up.
  • Page 17 LC-20B1U Pin functions of microprocessor IC (IC2001) RH-iXA276WJZZQ 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 18 LC-20B1U Adjustment process mode menus at a glance Page Item Initial setting Function Adjust/modify Basic settings INCH SIZE Inch size select Adjustment MODEL Model number CARD SYSTEM N358 Color system select NTSC PWN FREQ Dimmer frequency setting PAL PWM FREQ...
  • Page 19 LC-20B1U Page Item Initial setting Function Adjust/modify Video adjustments (VPC settings) I2C DATA C bus control IC data write & read IC2 DATA WAIT Write & read execution Chroma band pass setting NOSEL Comb filter setting Comb filter setting Comb filter setting...
  • Page 20 LC-20B1U Page Item Initial setting Function Adjust/modify Video adjustments (TV, composite & S video) PAL AV COLOR 2500 Color density setting (composite, S video) PAL AV TINT Color tone setting (composite, S video) PAL BRIGHTNESS Brightness setting (TV, composite, S video)
  • Page 21 LC-20B1U Page Item Initial setting Function Adjust/modify Search AFT reference & 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 NTSC 05...
  • Page 22 LC-20B1U 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 23 LC-20B1U Page Item Initial setting Function Adjust/modify Card mode LCD controller setting VPC SYNC Card mode sync setting Card mode OSD position setting CARD 01 Initial setting CARD 02 Various setting CARD 03 RCUTOFF CARD 04 GCUTOFF CARD 05 BCUTOFF...

  • Page 24: Trouble Shooting Table

    LC-20B1U TROUBLE SHOOTING TABLE...
  • Page 25 LC-20B1U...
  • Page 26 LC-20B1U...
  • Page 27 LC-20B1U...
  • Page 28 LC-20B1U...
  • Page 29 LC-20B1U...

  • Page 30: Chassis Layout

    LC-20B1U CHASSIS LAYOUT CONTROL UNIT DIGTAL UNIT ANALOG UNIT RC/LED UNIT...
  • Page 31 LC-20B1U INVERTER-A UNIT INVERTER-B UNIT...

  • Page 32: Block Diagram

    LC-20B1U BLOCK DIAGRAM ANALOG UNIT TV-V TUNER TU3201 SIF-AMP. Q3201 Q3202 SY, SC S-VIDEO L1, R1 INPUT V2/VO TV-V VIDEO AUDIO VIDEO SWITCH L2, R2 INPUT IN/OUT IN/OUT IC402 OUTPUT SWITCH SWITCH VOUT IC3501 Q3501-Q3505 Q3500 6 d B AMP.
  • Page 33 LC-20B1U DIGITAL UNIT REGULATOR Y and C SYOUT, SCOUT 3D Y/C IC7102 YO, CO SWITCH SEPARATOR IC7101 IC7001 REGULATOR IC7002 IC7701 V1SY, V1SC PC CA RD 3.3VREG. RESET UNIT IC7004 IC901 SUBDIN,SUBDOUT SY, SC VIDEO DECODER BUFFER IC903 AV1 V...

  • Page 34: Description Of Schematic Diagram

    LC-20B1U DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: CAUTION: 1. Voltages at test points are measured on exclusive This circuit diagram is original one, therefore there may be a AC adapter or the stable supply voltage of AC 120V. slight difference from yours.

  • Page 35: Schematic Diagramë Control And Rc/Led Unit

    LC-20B1U SCHEMATIC DIAGRAM Ë CONTROL and RC/LED Unit...

  • Page 36: Ë Digital Unit

    LC-20B1U Ë DIGITAL Unit-1/5...
  • Page 37 LC-20B1U...
  • Page 38 LC-20B1U Ë DIGITAL Unit-2/5...
  • Page 39 LC-20B1U...
  • Page 40 LC-20B1U Ë DIGITAL Unit-3/5...
  • Page 41 LC-20B1U...
  • Page 42 LC-20B1U Ë DIGITAL Unit-4/5...
  • Page 43 LC-20B1U...
  • Page 44 LC-20B1U Ë DIGITAL Unit-5/5...
  • Page 45 LC-20B1U...

  • Page 46: Ë Analog Unit

    LC-20B1U Ë ANALOG Unit-1/2...
  • Page 47 LC-20B1U...
  • Page 48 LC-20B1U Ë ANALOG Unit-2/2...
  • Page 49 LC-20B1U...

  • Page 50: Ë Inverter-A Unit

    LC-20B1U Ë INVERTER-A Unit...

  • Page 51: Ë Inverter-B Unit

    LC-20B1U Ë INVERTER-B Unit...

  • Page 52: Printed Wiring Board Assemblies

    LC-20B1U PRINTED WIRING BOARD ASSEMBLIES CONTROL Unit (Side-A) DIGITAL Unit (Side-A)
  • Page 53 LC-20B1U CONTROL Unit (Side-B) DIGITAL Unit (Side-B)
  • Page 54 LC-20B1U INVERTER-A Unit (Side-A) INVERTER-B Unit (Side-A) RC/LED Unit (Side-A)
  • Page 55 LC-20B1U ANALOG Unit (Side-A)

  • Page 56: 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 57 LC-20B1U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE24 C402 VCKYCY1HB102K J 1000p 50V Ceramic C403 VCKYCY1EF104Z J 0.1 Ceramic DIGITAL UNIT (Continued) C404 VCEASM0JW476MY J 47 6.3V Electrolytic C405 VCKYCY1HB222K J 2200p 50V Ceramic...
  • Page 58 LC-20B1U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE24 C2016 VCKYCY1EF104Z J 0.1 Ceramic C2017 VCKYCY1EF104Z J 0.1 Ceramic DIGITAL UNIT (Continued) C2018 VCCCCY1HH220J J 22p Ceramic C2020 VCKYCY1HB271K J 270p Ceramic C1116 VCKYCY1EF104Z J 0.1...
  • Page 59 LC-20B1U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE24 R1003 VRS-CY1JF103F J 10k 1/16W Metal Oxide R1005 VRS-CY1JF103F J 10k 1/16W Metal Oxide DIGITAL UNIT (Continued) R1006 VRS-CY1JF243F J 24k 1/16W Metal Oxide R1007 VRS-CY1JF563F...
  • Page 60 LC-20B1U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE24 R2011 VRS-CB1JF101J J 100 1/16W Metal Oxide R2012 VRS-CA1JF103J J 10k 1/16W Metal Oxide DIGITAL UNIT (Continued) R2013 VRS-CA1JF223J J 22k 1/16W Metal Oxide R2014 VRS-CA1JF101J...

  • Page 61: Ë Analog Unit

    LC-20B1U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE24 DUNTKB128DE06 DIGITAL UNIT (Continued) ANALOG UNIT TUNER R7045 VRS-CY1JF473J J 47k 1/16W Metal Oxide R7046 VRS-CY1JF182J J 1.8k 1/16W Metal Oxide NOTE: THE PARTS HERE SHOWN ARE SUPPLIED AS AN...
  • Page 62 LC-20B1U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB128DE06 C3349 VCKYCY1EF104Z J 0.1 Ceramic C3350 VCEAPF1CN106M J 10 Electrolytic ANALOG UNIT (Contined) C3351 RC-KZ1025CEZZ Ceramic C3352 VCEAPF0JN107M J 100 6.3V Electrolytic PACKGED CIRCUIT C3354 VCCCCY1HH560J...
  • Page 63 LC-20B1U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB128DE06 R3369 VRS-CY1JF101J J 100 1/16W Metal Oxide R3370 VRS-CY1JF101J J 100 1/16W Metal Oxide ANALOG UNIT (Contined) R3371 VRS-CY1JF000J 1/16W Metal Oxide R3372 VRS-CY1JF000J 1/16W Metal Oxide...

  • Page 64: Ë Control Unit

    LC-20B1U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB128DE06 DUNTKB129DE06 ANALOG UNIT (Contined) CONTROL UNIT DIODES R3718 VRS-CE3AF821JY J 820 1W Metal Oxide R3721 VRS-CY1JF000J 1/16W Metal Oxide D4008 RH-EX1283CEZZ J Zener Diode, 18V R3722 VRS-CY1JF000J...

  • Page 65: Ë Inverter-A Unit

    LC-20B1U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB132DE01 DUNTKB133DE01 INVERTER-A UNIT INVERTER-B UNIT TRANSISTORS TRANSISTORS Q6700 VSFZT1053A/-1 J FZT1053A Q6709 VSFZT1053A/-1 J FZT1053A Q6701 VSFZT1053A/-1 J FZT1053A Q6710 VSFZT1053A/-1 J FZT1053A Q6702 VS2SA1530AR-1 J 2SA1530AR...

  • Page 66: Ë Cabinet And Mechanical Parts

    LC-20B1U CABINET AND MECHANICAL PARTS CONTROL UNIT INVERTER-A UNIT 1-12 DIGITAL UNIT 1-11 INVERTER-B UNIT 1-11 1-12 1-10 RC/LED UNIT ANALOG UNIT 5-10 CARD UNIT 5-20 5-19 5-12 5-11 5-16 5-17 3-11 5-18 5-21 5-15 3-17 5-14 5-19 5-20 5-13...
  • Page 67 LC-20B1U Ref. No. Part No. Description Code Ref. No. Part No. Description Code MSPRD0088CEFW J Spring, for Flap Door CABINET AND MECHANICAL PARTS GCOVA2028CEKA J Back Cover GCOVA2038CEKA J Back Cover CCABAA026WJ01 J Front Cabinet Ass'y GCOVA2103CEKA J Chassis Frame Cover Not Available –...

  • Page 68: Ë Accessories Parts

    LC-20B1U Ref. No. Part No. Description Code Ref. No. Part No. Description Code PACKING PARTS SUPPLIED ACCESSORIES (NOT REPLACEMENT ITEM) LHLDW0109CESA J Cable Calmp, x2 SPAKCA054WJZZ – Packing Case — QACCD3097CEPA J AC Cord å SPAKPA001WJZZ – Wrapping Paper —...

  • Page 69: Packing Of The Set

    LC-20B1U PACKING OF THE SET Operation Manual (TiNS-A109WJZZ) Cable Clamp (2 pcs.) (LHLDW0109CESA) Dry Battery (2 pcs.) AC Adapter (UADP-0243CEPZ) AC Cord Remote Control (QACCD3097CEPA) (RRMCGA051WJSA) Antenna Cable (QCNWG0003CEPA) Buffer Material (Top and Bottom) (SPAKXA050WJZZ) Polyethylene Bag (SPAKPA001WJZZ) Buffer material...
  • Page 70 LC-20B1U 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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