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Sharp LC-20C2E Service Manual

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Download this manual See also: Operating Manual
» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................ 2
» ELECTRICAL SPECIFICATIONS ......................................................................................................... 3
» OPERATION MANUAL ......................................................................................................................... 4
» OUTLINE DIMENSION FIGURE .......................................................................................................... 5
» DISASSEMBLY OF THE SET .............................................................................................................. 6
» ADJUSTING PROCEDURE OF EACH SECTION ............................................................................... 9
» TROUBLE SHOOTING TABLE .......................................................................................................... 12
» CHASSIS LAYOUT ............................................................................................................................. 17
» BLOCK DIAGRAMS ........................................................................................................................... 20
» DESCRIPTION OF SCHEMATIC DIAGRAM ..................................................................................... 23
» OVERALL SCHEMATIC DIAGRAM ................................................................................................... 24
» SCHEMATIC DIAGRAMS ................................................................................................................... 26
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 46
» PARTS LIST
Ë ELECTRICAL PARTS .................................................................................................................... 50
INVERTER A UNIT ......................................................................................................................... 50
INVERTER B UNIT ........................................................................................................................ 50
MAIN UNIT ..................................................................................................................................... 50
VIDEO UNIT ................................................................................................................................... 54
SWITCH UNIT ................................................................................................................................ 55
S-OUT UNIT ................................................................................................................................... 55
Ë CABINET PARTS LIST .................................................................................................................. 56
Ë SUPPLIED ACCESSORIES PARTS .............................................................................................. 56
Ë PACKING PARTS ........................................................................................................................... 56
Ë CABINET AND MECHANICAL PARTS .......................................................................................... 57
» PACKING OF THE SET ...................................................................................................................... 58
SERVICE MANUAL
MODEL
In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.
CONTENTS
SHARP CORPORATION
LCD COLOUR TELEVISION
LC-20C2E
1
LC-20C2E
S81Y6LC-20C2E
Page

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Summary of Contents for Sharp LC-20C2E

  • Page 1: Table Of Contents

    LC-20C2E SERVICE MANUAL S81Y6LC-20C2E LCD COLOUR TELEVISION LC-20C2E MODEL In the interests of user-safety (Required by safety regula- tions in some countries) the set should be restored to its original condition and only parts identical to those specified be used.

  • Page 2: Important Service Safety Precaution

    LC-20C2E 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: Electrical Specifications

    LC-20C2E ELECTRICAL SPECIFICATIONS Items ............. 20" LCD COLOUR TV, Model: LC-20C2E LCD panel .................. 19.7" BLACK TFT LCD Number of pixels ..................921,600 dots Video colour system ................ PAL/SECAM/NTSC TV FUNCTION TV Standard (CCIR) ............... BG/L/DK, I, M, N TV Tuning System ..............Auto preset 197 ch.

  • Page 4: Operation Manual

    LC-20C2E OPERATION MANUAL Controls Terminals Front view To change the vertical angle of the LCD TV set, tilt the screen up to 5 degrees forward or 10 degrees backward. The TV Antenna set can also be rotated 40 degrees horizontally. Please adjust the angle so that the TV set can be watched most comfortably.

  • Page 5: Outline Dimension Figure

    LC-20C2E OUTLINE DIMENSION FIGURE 476.6 401.3 403.28 56.5 AV-IN 2 VIDEO AUDIO AV-IN 1 S-VIDEO AUDIO OUT POWER INPUT DC12V 18.5 12.5 163.9 65.5 229.4 Units: mm...

  • Page 6: Disassembly Of The Set

    LC-20C2E DISASSEMBLY OF THE SET 1. Remove 4 screws from the stand. 2. Detatch the terminal cover. 3. Remove 5 screws from the B cabinet. 4. Remove 3 screws. 5. A cabinet is opened in order of 5-1 ~ 5-9, and B cabinet is removed.
  • Page 7 LC-20C2E 8. Remove 2 screws from the INVERTER A PWB. 9. Remove 4 screws from the TUNER PWB. 10.Remove 2 screws from the VIDEO PWB. 11.Remove 3 screws from the MAIN PWB. 12.Remove 2 screws from the INVERTER B PWB.
  • Page 8 LC-20C2E • 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: Adjusting Procedure Of Each Section

    LC-20C2E ADJUSTING PROCEDURE OF EACH SECTION [1] Entering the MAIN side adjustment process mode There are three methods below. 1) Press the “Adjustment process key” on the remote control after turning on the power. 2) Pressing both the MENU key and the TV/VIDEO key on the main body, turn on the power. Then, press the volume DOWN key and the tuning DOWN key at the same time.
  • Page 10 LC-20C2E PAL/PAL60 SECAM NTSC y delay tint offset sub contrast sub colour y delay tint offset sub contrast sub colour y delay tint offset sub contrast sub colour AGC gain start 3-1. +B adjustment Page 9 of MAIN side adjustment process +B-ADJ Adjust the voltage of the pin 13 of P2002 to 5.0V±0.05V.
  • Page 11 LC-20C2E [4] Lamp error detection 4-1. Functional description This LCD colour television has a function (lamp error detection) to be turned OFF automatically for safety when the lamp or lamp circuit is abnormal. If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is executed, the followings occur.

  • Page 12: Trouble Shooting Table

    LC-20C2E TROUBLE SHOOTING TABLE...

  • Page 13: Trouble Shooting Table

    LC-20C2E TROUBLE SHOOTING TABLE (Continued)
  • Page 14 LC-20C2E TROUBLE SHOOTING TABLE (Continued)
  • Page 15 LC-20C2E TROUBLE SHOOTING TABLE (Continued)
  • Page 16 LC-20C2E TROUBLE SHOOTING TABLE (Continued)

  • Page 17: Chassis Layout

    LC-20C2E CHASSIS LAYOUT INVERTER A Unit INVERTER B Unit TUNER Unit...
  • Page 18 LC-20C2E MAIN Unit (Side-A) MAIN Unit (Side-B)
  • Page 19 LC-20C2E VIDEO Unit SWITCH Unit S-OUT Unit...

  • Page 20: Block Diagrams

    LC-20C2E LC-20C2E BLOCK DIAGRAMS Ë MAIN BLOCK DIAGRAM J4001 AUDIO HEAD PHONE JACK AMPLIFER DACA_L/R IC304 FLSP SC902 SC2 OUT L/R FRSP DACM_L/R AUDIO OUTPUT FRONT SPEAKER IC903 AMPLIFER IC901 REVERSE IC3305 IC303 BUFFER TUNER IC902 PA VCC TV/AV TV V...
  • Page 21 LC-20C2E Ë TUNER BLOCK DIAGRAM...

  • Page 22: Description Of Schematic Diagram

    LC-20C2E DESCRIPTION OF SCHEMATIC DIAGRAM [Item] IMPORTANT SAFETY NOTICE: å PARTS MARKED WITH " "( ) ARE Resistors INPORTANT FOR MAINTAINING THE SAFETY OF Nonindication Carbon-film resistor THE SET. Solid resistor BE SURE TO REPLACE THESE PARTS WITH Metal-oxide-film resistor...

  • Page 23: Overall Schematic Diagram

    LC-20C2E LC-20C2E OVERALL SCHEMATIC DIAGRAM LCD GATE LCD SOURCE BACK LIGHT TUNER PWB RUNTK0704CEZZ...

  • Page 24: Schematic Diagrams

    LC-20C2E SCHEMATIC DIAGRAMS Ë Ë Ë Ë Ë INVERTER A Unit...
  • Page 25 LC-20C2E Ë Ë Ë Ë Ë INVERTER B Unit...
  • Page 26 LC-20C2E LC-20C2E Ë Ë Ë Ë Ë MAIN Unit - 1/6...
  • Page 27 LC-20C2E LC-20C2E Ë Ë Ë Ë Ë MAIN Unit - 2/6...
  • Page 28 LC-20C2E LC-20C2E Ë Ë Ë Ë Ë MAIN Unit - 3/6...
  • Page 29 LC-20C2E LC-20C2E Ë Ë Ë Ë Ë MAIN Unit - 4/6...
  • Page 30 LC-20C2E LC-20C2E Ë Ë Ë Ë Ë MAIN Unit - 5/6...
  • Page 31 LC-20C2E LC-20C2E Ë Ë Ë Ë Ë MAIN Unit - 6/6 å AND SHADED COMPONENTS=SAFETY RELATED PARTS...
  • Page 32 LC-20C2E Ë Ë Ë Ë Ë VIDEO Unit...
  • Page 33 LC-20C2E Ë Ë Ë Ë Ë SWITCH Unit...
  • Page 34 LC-20C2E LC-20C2E Ë Ë Ë Ë Ë S-OUT Unit...
  • Page 35 LC-20C2E LC-20C2E Ë Ë Ë Ë Ë TUNER Unit å AND SHADED COMPONENTS=SAFETY RELATED PARTS...

  • Page 36: Printed Wiring Board Assemblies

    LC-20C2E PRINTED WIRING BOARD ASSEMBLIES Inverter A Unit Inverter B Unit...

  • Page 37: Main Unit

    LC-20C2E Main Unit (Side-A) Main Unit (Side-B)

  • Page 38: Video Unit

    LC-20C2E Video Unit (Side-A) Video Unit (Side-B)

  • Page 39: Switch Unit

    LC-20C2E Switch Unit (Side-A) Switch Unit (Side-B) S-OUT Unit (Side-A) S-OUT Unit (Side-B)
  • Page 40 LC-20C2E PARTS LIST Ref. No. Part No. Description Code Ref. No. Part No. Description Code C6760 VCKYCY1CB333K J 0.033 16V Ceramic PARTS REPLACEMENT C6761 VCEAPW1CN477M J 470 16V Electrolytic C6762 VCEAPW1CN477M J 470 16V Electrolytic Replacement parts which have these special safety character-...
  • Page 41 LC-20C2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA551DE02 PACKAGED CIRCUITS MAIN UNIT (Continued) X801 RCRSC0012CEZZ J Crystal X901 RCRSB0250GEZZ J Crystal IC304 VHiBH3543F+-1 J BH3543F-E2 FILTERS IC401 VHiBA7046F/-1 J BA7046F FL401 RFiLC0470CEZZY J Filter...
  • Page 42 LC-20C2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA551DE02 C943 VCKYCY1EF104Z J 0.1 25V Ceramic C944 VCEAPF1CW106M J 10 16V Electrolytic MAIN UNIT (Continued) C945 VCEAPF1HW225M J 2.2 50V Electrolytic C946 VCEAPF1HW225M J 2.2 50V Electrolytic...
  • Page 43 LC-20C2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA551DE02 R735 VRS-CY1JF223J J 22k 1/16W Metal Oxide AA R736 VRS-CY1JF1R0J 1/16W Metal Oxide AA MAIN UNIT(Continued) R741 VRS-TQ2BD000J 1/8W Metal Oxide AA R747 VRS-CY1JF000J 1/16W Metal Oxide AA...
  • Page 44 LC-20C2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA551DE02 R2007 VRS-CY1JF223J J 22k 1/16W Metal Oxide AA R2008 VRS-CY1JF101J J 100 1/16W Metal Oxide AA MAIN UNIT (Continued) R2009 VRS-CY1JF102J J 1k 1/16W Metal Oxide AA...
  • Page 45 LC-20C2E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA551DE02 TRANSISTORS VIDEO UNIT (Continued) Q3304 VSDTC314TK/-1 J DTC314TK Q3305 VSDTC314TK/-1 J DTC314TK Q3307 VSDTC314TK/-1 J DTC314TK R5708 VRS-CY1JF153J J 15k 1/16W Metal Oxide AA Q3308 VSDTC314TK/-1...

  • Page 46: Cabinet Parts List

    SUPPLIED ACCESSORIES HiNDP5818CESA J Model Indicator PSPAH0682CE00 J Spacer PSPAH0681CE00 J Spacer LHLDW0109CESA J Cabel Clamp å QACCK0002TAZZ J AC Cord (LC-20C2E) å CDAi-1122CE01 J Stand Ass'y QACCB0016TAZZ J AC Cord (LC-20C2E(K)) GCOVA1945CESA J Stand Grip TiNS-7412CEZZ J Opearation Manual GDAi-1122CESA...

  • Page 47: Cabinet And Mechanical Parts

    LC-20C2E CABINET AND MECHANICAL PARTS 1-13 1-12 1-14 D P Q S-OUT PWB 1-11 Main PWB Switch PWB 1-10 1-14 Inverter A PWB Video PWB 1-13 1-12 Tuner Unit Inverter B PWB 3-11 3-16 3-19 3-17 3-19 3-13 3-16 3-12...

  • Page 48: Packing Of The Set

    LC-20C2E PACKING OF THE SET å UADP-0218CEZZ RRMCG1656CESA (AC Adaptor) (Remote Control) å SSAKA0160CEZZ (Operation Manual QACCK0002TAZZ(LC-20C2E) Polyethylene Bag) QACCB0016TAZZ(LC-20C2E(K)) (Power Supply Cord) TiNS-7412CEZZ (Operation Manual) LHLDW0109CESA (Cable Clamp) (Battery) SSAKH0176CEZZ (Protection Bag) SPAKX2943CEZZ (Buffer Material) SPAKP0912CEZZ (Wrapping Paper) SPAKH0150CEZZ...
  • Page 49 LC-20C2E...
  • Page 50 LC-20C2E COPYRIGHT C 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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