Sharp LC-20E1E Service Manual
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Sharp LC-20E1E Service Manual

Sharp LC-20E1E 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 ........................................................................................................................................ 3
» OPERATION MANUAL ................................................................................................................................. 4
» DIMENSIONS ............................................................................................................................................... 6
» REMOVING OF MAJOR PARTS .................................................................................................................. 7
» ADJUSTING PROCEDURE OF EACH SECTION ..................................................................................... 11
» TROUBLE SHOOTING TABLE ..................................................................................................................14
» CHASSIS LAYOUT .....................................................................................................................................20
» BLOCK DIAGRAM ......................................................................................................................................22
» OVERALL WIRING DIAGRAM ...................................................................................................................24
» DESCRIPTION OF SCHEMATIC DIAGRAM ............................................................................................. 26
» SCHEMATIC DIAGRAM ............................................................................................................................. 27
» PRINTED WIRING BOARD ASSEMBLIES ................................................................................................50
» REPLACEMENT PARTS LIST ...................................................................................................................61
» PACKING OF THE SET ..............................................................................................................................75
SERVICE MANUAL
LCD COLOUR TELEVISION
MODEL
CONTENTS
SHARP CORPORATION
LC-20E1E
LC-20E1E
S72M2LC20-E1E
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Summary of Contents for Sharp LC-20E1E

  • Page 1: Table Of Contents

    LC-20E1E SERVICE MANUAL S72M2LC20-E1E LCD COLOUR TELEVISION LC-20E1E 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-20E1E 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: Specifications

    LC-20E1E SPECIFICATIONS Items 20" LCD COLOUR TV, Model: LC-20E1E LCD panel Advanced Super View & BLACK TFT LCD LCD panel size 19.7" Number of dots 921,600 dots Video colour system PAL/SECAM/NTSC TV-Standard (CCIR) B/G, I, D/K, L Function TV-Tuning System Auto preset 200 ch.

  • Page 4: Operation Manual

    LC-20E1E OPERATION MANUAL...
  • Page 5 LC-20E1E...

  • Page 6: Dimensions

    LC-20E1E DIMENSIONS Unit: mm MENU TV/VIDEO AV- IN 1 AV- IN 1 S-VIDEO VIDEO AUDIO OUT AUDIO POWER INPUT DC13V...

  • Page 7: Removing Of Major Parts

    LC-20E1E 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 8 LC-20E1E 11. Remove the inverter-A PWB fixing screws (2 pcs.). 12. Remove the inverter-B PWB fixing screws (1 pc.). 13. Remove the main PWB fixing screws (3 pcs.). 14. Remove the 21-pin terminal fixing screw (2 pcs.). 15. Remove the tuner PWB fixing screws (3 pcs.) and detatch the chassis frame cover fixing hooks.
  • Page 9 LC-20E1E » 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 10 LC-20E1E »Precautions at the time of the side B(back) service of main unit. 1. Remove only SC2001 of the FFC for connection between Main unit(SC2001) and Tuner unit(SC3100), and con- nect the extended cable (QCNW-A369WJZZ) for service. 2. Remove only P3702 of the FFC for connection between Main unit(P3702) and Tuner unit(P1903), and connect the extended cable (QCNW-A371WJZZ) for service.

  • Page 11: Adjusting Procedure Of Each Section

    LC-20E1E 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. Preparation for adjustments Use the dedicated AC adaptor or stable DC power supply.
  • Page 12 LC-20E1E 4. Initialization When the microprocessor (IC2001) or the EEPROM (IC2004) has been replaced or when the EEPROM has been initialized, readjust the each adjustments. 4-1. Connect the pins (81) and (82) of IC2001 (microprocessor) to GND, and turn on the power.
  • Page 13 LC-20E1E 6. Factory Setting 6-1. Perform a factory setting after completing all adjustments. 6-2. A “POWER” keys is made on with pushing an “TV/VIDEO” and “MENU” keys at the same time. 6-3. “K” of the inspection process mode is displayed on the screen upper left.

  • Page 14: Trouble Shooting Table

    LC-20E1E TROUBLE SHOOTING TABLE...
  • Page 15 LC-20E1E TROUBLE SHOOTING TABLE (Continued)
  • Page 16 LC-20E1E TROUBLE SHOOTING TABLE (Continued)
  • Page 17 LC-20E1E TROUBLE SHOOTING TABLE (Continued)
  • Page 18 LC-20E1E TROUBLE SHOOTING TABLE (Continued)
  • Page 19 LC-20E1E TROUBLE SHOOTING TABLE (Continued)

  • Page 20: Chassis Layout

    LC-20E1E CHASSIS LAYOUT OPERATION Unit MAIN Unit TUNER Unit R/C, LED Unit...
  • Page 21 LC-20E1E INVERTER-A Unit INVERTER-B Unit...

  • Page 22: Block Diagram

    LC-20E1E BLOCK DIAGRAM TUNER ANTENNA ANA_IN1+/2+ SIF1/2 DACM_L/R AI_L/R SC2_IN_L/R AUDIO AMP SC1_OUT_L/R SC3903 SCART IC1901 DACA_L/R (AV1) IC1902 SC1_IN_L/R SC_L/R AUDIO IN SC2_OUT_L AUDIO OUT TV_V VIDEO OUT TV/AV SDA/RXD SELECTOR V2_V R/G/B_IN V1.SY IC402 SCL/TXD V1. SC C/UART...
  • Page 23 LC-20E1E AUDIO ACTIVE FILTER SPEAKER L/R_IN AUDIO POWER AMP CM_L/R IC1903 P3301 FLSP/FRSP IC3305 P3302 AUDIO AMP ACA_L/R J5003 HEADPHONE IC304 HL/R JACK A0_L/R SC2_OUT_L/R AUDIO AMP IC3500 J3902 PAVCC(+13V) AUDIO OUT Y/UV J3903 SYNC SIGNAL CONTROLLER CONTROL SIGNAL R0~7 G0~7 B0~7...

  • Page 24: Overall Wiring Diagram

    LC-20E1E OVERALL WIRING DIAGRAM...
  • Page 25 LC-20E1E...

  • Page 26: Description Of Schematic Diagram

    LC-20E1E 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 27: Schematic Diagram

    LC-20E1E SCHEMATIC DIAGRAM Ë R/C, LED and OPERATION Unit R/C, LED OPERATION...
  • Page 28 LC-20E1E Ë MAIN Unit-1/6...
  • Page 29 LC-20E1E...
  • Page 30 LC-20E1E Ë MAIN Unit-2/6...
  • Page 31 LC-20E1E...
  • Page 32 LC-20E1E Ë MAIN Unit-3/6...
  • Page 33 LC-20E1E...
  • Page 34 LC-20E1E Ë MAIN Unit-4/6...
  • Page 35 LC-20E1E...
  • Page 36 LC-20E1E Ë MAIN Unit-5/6...
  • Page 37 LC-20E1E...
  • Page 38 LC-20E1E Ë MAIN Unit-6/6...
  • Page 39 LC-20E1E...
  • Page 40 LC-20E1E Ë TUNER Unit-1/4...
  • Page 41 LC-20E1E...
  • Page 42 LC-20E1E Ë TUNER Unit-2/4...
  • Page 43 LC-20E1E...
  • Page 44 LC-20E1E Ë TUNER Unit-3/4...
  • Page 45 LC-20E1E...
  • Page 46 LC-20E1E Ë TUNER Unit-4/4...
  • Page 47 LC-20E1E...
  • Page 48 LC-20E1E Ë INVERTER-A Unit...
  • Page 49 LC-20E1E Ë INVERTER-B Unit...

  • Page 50: Printed Wiring Board Assemblies

    LC-20E1E PRINTED WIRING BOARD ASSEMBLIES INVERTER-A Unit (Component Side) INVERTER-B Unit (Component Side)
  • Page 51 LC-20E1E INVERTER-A Unit (Chip Parts Side) INVERTER-B Unit (Chip Parts Side)
  • Page 52 LC-20E1E MAIN Unit (Side-A)
  • Page 53 LC-20E1E P2003 SC2001 C3714 L3703 C3732 FB3700 Q3706 R3750 C3722 C3733 R3751 R3752 T3701 C3735 L3700 C3724 FB3705 C3708 D3705 R3710 C3703 C3701 C2016 C3719 C3716 FB802 D3701 C3706 R3727 R1142 C1156 C2001 C1137 C1136 R1185 C2002 R1195 R1194 R2001...
  • Page 54 LC-20E1E MAIN Unit (Side-B)
  • Page 55 LC-20E1E R3730 R3729 C3715 D3704 C3730 C3711 R3723 FB3704 FB3703 C3738 R3718 D3707 FB3707 R3702 C3721 C3720 D3703 D3700 Q3700 C3725 D3708 R3724 FB3708 FB3701 R3731 R3732 C1154 Q3701 R3768 C751 R751 R1146 Q3709 C3740 R3706 R3705 R753 R754 R752...
  • Page 56 LC-20E1E P4001 D4010 D4009 D4008 SW4006 SW4004 R4012 R4011 SW4003 SW4002 R4005 R4006 SW4007 SW4008 (Component Side) (Chip Parts Side) OPERATION Unit (QPWBSB156WJN3)
  • Page 57 LC-20E1E TUNER Unit (Component Side)
  • Page 58 LC-20E1E P3703 Q3650 D3301 P3604 P3603 R3650 R3370 C1941 D3302 R3371 R3372 R1923 R1944 C3361 C3364 R1937 R3362 IC1902 C1933 R1935 R1918 R1916 C1904 C1942 C1960 C3363 C3366 R1947 R1910 R1919 R1948 C1938 R1914 Q3305 R3363 C1931 R1921 R1932 R1931...
  • Page 59 LC-20E1E P3602 P3601 J5003 R3601 D302 R3600 R3605 5002 C1933 R3603 R1918 R1916 C1904 R1947 R1919 R1948 R1914 C1931 R1921 Q3601 Q3600 R1915 C1930 C1903 C3505 D3607 D3606 D3605 D3604 C3504 R3507 R3608 R3972 R3607 R3513 R3510 R3970 R3512 R3511...
  • Page 60 LC-20E1E R/C, LED Unit (Component Side) D4022 R4023 Q4001 D4012 Q4007 R4024 D4014 D4011 R4029 R/C, LED Unit (Chip Parts Side)

  • Page 61: Replacement Parts List

    LC-20E1E Ref. No. Part No. Description Code Ref. No. Part No. Description Code PARTS LIST IC1116 VHiNJM2147M-1Y J NJM2147M-TE1 IC1201 RH-iX3378CEN1Q J LR38815 PARTS REPLACEMENT IC1202 VHiPD485505-2Y J UPD485505G-25 IC1203 RH-iX1518CEZZY J TC74HC157AF IC1206 VHiLVX125FT-1Y J TC74LVX125FT Replacement parts which have these special safety characteristics...
  • Page 62 LC-20E1E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB148FE12 C837 RC-KZ1025CEZZY Ceramic C838 VCEAPF0GW107MY J 100 Electrolytic MAIN UNIT (Continued) C839 RC-KZ1025CEZZY Ceramic C840 VCKYTV1CF684ZY J 0.68 Ceramic D3708 VHDDAN222//-1Y J Diode C842 VCKYCY1CF104ZY J 0.1...
  • Page 63 LC-20E1E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB148FE12 R406 VRS-CY1JF102JY J 1k 1/16W Metal Oxide R408 VRS-CY1JF102JY J 1k 1/16W Metal Oxide MAIN UNIT (Continued) R409 VRS-CY1JF103JY J 10k 1/16W Metal Oxide R410 VRS-CY1JF474JY...
  • Page 64 LC-20E1E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB148FE12 R1186 VRS-CY1JF102JY J 1k 1/16W Metal Oxide R1187 VRS-CY1JF102JY J 1k 1/16W Metal Oxide MAIN UNIT (Continued) R1188 VRS-CY1JF102JY J 1k 1/16W Metal Oxide R1189 VRS-CY1JF000JY...
  • Page 65 LC-20E1E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB148FE12 MISCELLANEOUS PARTS FB801 RBLN-0090CEZZY J Ferrite Bead MAIN UNIT (Continued) FB802 RBLN-0090CEZZY J Ferrite Bead FB1201 RBLN-0090CEZZY J Ferrite Bead R2033 VRS-CB1JF101JY J 100 1/16W Metal Oxide...
  • Page 66 LC-20E1E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB152DE09 D2201 RH-EX0906CEZZY J Zener Diode, 30V D3301 VHDDAN222//-1Y J Diode TUNER UNIT D3302 RH-EX1396CEZZY J Zener Diode D3403 RH-EX1271CEZZY J Zener Diode, 5.6V TUNER D3404 RH-EX1271CEZZY J Zener Diode, 5.6V...
  • Page 67 LC-20E1E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB152DE09 C1938 VCEAPF1CW106MY J 10 Electrolytic C1939 VCKYTV1CF105ZY J 1 Ceramic TUNER UNIT (Continued) C1940 VCKYTV1CF105ZY J 1 Ceramic C1941 VCEAPF1EW475MY J 4.7 Electrolytic C1627 VCKYTV1CF105ZY J 1 Ceramic C1942 VCEAPF1EW475MY J 4.7...
  • Page 68 LC-20E1E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB152DE09 R1669 VRS-CB1JF332JY J 3.3k 1/16W Metal Oxide R1670 VRS-CY1JF473JY J 47k 1/16W Metal Oxide TUNER UNIT (Continued) R1671 VRS-CY1JF183FY J 18k 1/16W Metal Oxide R1675 VRS-CY1JF332JY J 3.3k 1/16W Metal Oxide...
  • Page 69 LC-20E1E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB152DE09 R3968 VRS-CY1JF000JY 1/16W Metal Oxide R3969 VRS-CY1JF000JY 1/16W Metal Oxide TUNER UNIT (Continued) R3970 VRS-CY1JF271JY J 270 1/16W Metal Oxide R3971 VRS-CY1JF271JY J 270 1/16W Metal Oxide...

  • Page 70: Operation Unit

    LC-20E1E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB155DE09 DUNTKB167DE04 R/C, LED UNIT INVERTER-A UNIT TRANSISTORS TRANSISTORS Q4001 VSDTC144EE/-1Y J DTC144EE Q6700 VSFZT1053A/-1Y J FZT1053A Q4003 VSDTC144EE/-1Y J DTC144EE Q6701 VSFZT1053A/-1Y J FZT1053A Q4007 VSUMG4N++++-1Y J UMG4N++++...
  • Page 71 LC-20E1E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB168DE04 INVERTER-B UNIT TRANSISTORS Q6709 VSFZT1053A/-1Y J FZT1053A Q6710 VSFZT1053A/-1Y J FZT1053A Q6711 VS2SA1530AR-1Y J 2SA1530AR Q6712 VSFZT1053A/-1Y J FZT1053A Q6713 VSFZT1053A/-1Y J FZT1053A Q6714 VS2SA1530AR-1Y J 2SA1530AR...
  • Page 72 LC-20E1E CABINET AND MECHANICAL PARTS Operation PWB Inverter-A PWB 1-13 1-14 Main PWB 1-11 Inverter-B 1-10 R/C, LED PWB 1-14 1-12 1-10 Tuner PWB 1-13...
  • Page 73 Not Available – Cabinet A — LHLDW1025TAZZ J Wire Holder, x1 GCOVA2020CEZZ J RC/LED Cover QCNW-6058CEZZ J Connecting Cord(MA) Not Available – Badge, ”SHARP” — QCNW-A314WJZZ J Connecting Cord(MT) PSPAGA027WJZZ J Spacer, x2 QCNW-A486WJZZ J Connecting Cord(MB) PSPAGA028WJZZ J Spacer, x2...

  • Page 74: Packing Parts

    Description Code PACKING PARTS ACCESSORIES (NOT REPLACEMENT ITEM) LHLDW0109CESA J Cable Clamp, x1 SPAKCA096WJZZ – Packing Case — QACCK0006TAZZ J AC Cord (LC-20E1E) SPAKFA014WJZZ – Buffer Material(Top) — å QACCB0016TAZZ J AC Cord (LC-20E1E SPAKFA093WJZZ – Buffer Material(Partition) — å...

  • Page 75: Packing Of The Set

    LC-20E1E PACKING OF THE SET Operation Manual (TiNS-A140WJZZ) Polyethylene Bag Cable Clamp (x1) (SSAKA0160CEZZ) (LHLDW0109CESA) Guarantee Card (TGAN-1688CEN1:LC-20E1E "AAA" size Battery (2pcs) Buffer Material (Top) (SPAKFA014WJZZ) Wrapping Paper (SPAKPA077WJZZ) Buffer Material (Partition) (SPAKFA093WJZZ) AC Cord (QACCK0006TAZZ:LC-E1E (QACCB0016TAZZ:LC-E1E AC Adapter Infrared R/C Unit...
  • Page 76 LC-20E1E 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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