Sharp LC-20B2EA Service Manual

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Operation manual (56 pages)

Service manual (54 pages)

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Summary of Contents for Sharp LC-20B2EA

Page 1: Table Of Contents
LC-20B2EA SERVICE MANUAL S92R1LC-20B2E LCD COLOUR TELEVISION LC-20B2EA 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-20B2EA Specifications 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: such as electrical conduit or electrical ground connected WARNING to an earth ground.
Page 3: Specifications
LC-20B2EA SPECIFICATIONS...
Page 4: Operation Manual
LC-20B2EA OPERATION MANUAL...
Page 5: Dimensions
LC-20B2EA DIMENSIONS Unit: mm MENU TV/VIDEO 401.3 107.3 72.6 AV-IN 1 AV-IN 2 S-VIDEO VIDEO AUDIO OUT AUDIO POWER INPUT DC13V 30.5 163.9 65.5 229.4...
Page 6: Removing Of Major Parts
LC-20B2EA REMOVING OF MAJOR PARTS 1. Remove the two back covers. 2. Remove the table stand fixing screws (4 pcs.). 3. Remove the cabinet B fixing screws (14 pcs.) and detach the cabinet. : XBBSF30P06000, : XEBSF40P16000) 4. Remove the reinforcement angle fixing screws (4 pcs.).
Page 7 LC-20B2EA 6. Remove the main PWB fixing screws (3 pcs.). 7. Remove the inverter-A PWB fixing screws (2 pcs.). 8. Remove the inverter-B PWB fixing screws (1 pc.). 9. Remove the chassis Frame-A fixing screws (3 pcs.). 10. Undo the hooks and slide the chassis frame B out of position. Take out the terminal PWB.
Page 8 LC-20B2EA » 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 LC-20B2EA » 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 10: Adjusting Procedure Of Each Section
LC-20B2EA 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 11 LC-20B2EA 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 12 LC-20B2EA 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 13: Trouble Shooting Table
LC-20B2EA TROUBLE SHOOTING TABLE...
Page 14 LC-20B2EA TROUBLE SHOOTING TABLE (Continued)
Page 15 LC-20B2EA TROUBLE SHOOTING TABLE (Continued)
Page 16 LC-20B2EA TROUBLE SHOOTING TABLE (Continued)
Page 17 LC-20B2EA TROUBLE SHOOTING TABLE (Continued)
Page 18: Chassis Layout
LC-20B2EA CHASSIS LAYOUT OPERATION Unit MAIN Unit TERMINAL Unit R/C RECEIVER Unit...
Page 19 LC-20B2EA INVERTER-A Unit INVERTER-B Unit...
Page 20: Block Diagram
LC-20B2EA BLOCK DIAGRAM TUNER ANTENNA ANA_IN1+/2+ SIF1/2 DACM_L/R AI_L/R SC2_IN_L/R SC1_OUT_L/R AUDIO AMP 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 21 LC-20B2EA 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 IC304 HEADPHONE 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 22: Overall Schematic Diagram
LC-20B2EA OVERALL SCHEMATIC DIAGRAM...
Page 23 LC-20B2EA...
Page 24: Description Of Schematic Diagram
LC-20B2EA DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: CAUTION: 1. Voltages at test points are measured at the This circuit diagram is original one, therefore there may be a supply voltage of AC 120V. Signals are fed by a slight difference from yours.
Page 25: Schematic Diagram
LC-20B2EA SCHEMATIC DIAGRAM Ë R/C RECEIVER and OPERATION Unit R/C RECEIVER Unit OPERATION Unit...
Page 26 LC-20B2EA Ë MAIN Unit-1/6...
Page 27 LC-20B2EA Ë MAIN Unit-2/6...
Page 28 LC-20B2EA...
Page 29 LC-20B2EA...
Page 30 LC-20B2EA Ë MAIN Unit-3/6...
Page 31 LC-20B2EA...
Page 32 LC-20B2EA Ë MAIN Unit-4/6...
Page 33 LC-20B2EA...
Page 34 LC-20B2EA Ë MAIN Unit-5/6...
Page 35 LC-20B2EA...
Page 36 LC-20B2EA Ë MAIN Unit-6/6 å...
Page 37 LC-20B2EA å...
Page 38 LC-20B2EA Ë TUNER Unit-1/4...
Page 39 LC-20B2EA...
Page 40 LC-20B2EA Ë TUNER Unit-2/4...
Page 41 LC-20B2EA...
Page 42 LC-20B2EA Ë TUNER Unit-3/4...
Page 43 LC-20B2EA å...
Page 44 LC-20B2EA Ë TUNER Unit-4/4...
Page 45 LC-20B2EA...
Page 46 LC-20B2EA Ë INVERTER-A Unit å å å...
Page 47 LC-20B2EA INVERTER-B Unit å å...
Page 48: Printed Wiring Board Assemblies
LC-20B2EA PRINTED WIRING BOARD ASSEMBLIES MAIN Unit (Side-A)
Page 49 LC-20B2EA MAIN Unit (Side-B)
Page 50 LC-20B2EA TUNER Unit...
Page 51 LC-20B2EA INVERTER-B Unit R/C RECEIVER Unit INVERTER-A Unit OPERATION Unit (QPWBSB156WJZZ)
Page 52: Parts List
LC-20B2EA Ref. No. Part No. Description Code Ref. No. Part No. Description Code PARTS LIST IC2004 VHiBR2416E2-1 J BR24C16F IC2030 VHiM95640MN-1Y J I.C. PARTS REPLACEMENT IC2031 VHiSNT1G32C-1 J SN74AHCT1G32DC Replacement parts which have these special safety characteristics IC2032 VHiTC4W66F/-1 J TC4W66F...
Page 53 LC-20B2EA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB148FE06 C844 VCCCCY1HH180J J 18p Ceramic C845 VCCCCY1HH180J J 18p Ceramic MAIN Unit(Continued) C846 VCCCCY1HH180J J 18p Ceramic C847 VCCCCY1HH180J J 18p Ceramic FILTERS C848 VCCCCY1HH101J J 100p...
Page 54 LC-20B2EA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB148FE06 R419 VRS-CY1JF101J J 100 1/16W Metal Oxide R420 VRS-CY1JF152J J 1.5k 1/16W Metal Oxide MAIN Unit(Continued) R421 VRS-CY1JF332J J 3.3k 1/16W Metal Oxide R422 VRS-CY1JF471J J 470 1/16W Metal Oxide C1225 VCKYCY1EF104Z J 0.1...
Page 55 LC-20B2EA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB148FE06 R1198 VRS-CY1JF000J 1/16W Metal Oxide R1199 VRS-CY1JF000J 1/16W Metal Oxide MAIN Unit(Continued) R1201 VRS-CY1JF000J 1/16W Metal Oxide R1202 VRS-CF1JP220JY J 22 1/16W Metal Oxide R1108 VRS-CY1JF103F...
Page 56 LC-20B2EA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB148FE06 FB3705 RBLN-0051TAZZ J Ferrite Bead FB3706 RBLN-0254TAZZY J Ferrite Bead MAIN Unit(Continued) FB3707 RBLN-0254TAZZY J Ferrite Bead FB3708 RBLN-0051TAZZ J Ferrite Bead R2044 VRS-CY1JF472J J 4.7k 1/16W Metal Oxide...
Page 57 LC-20B2EA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB152DE03 D2200 RH-EX1264CEZZ J Zener Diode D2201 RH-EX0906CEZZ J Zener Diode TUNER Unit D3301 VHDDAN222//-1 J DAN222 D3302 RH-EX1396CEZZY J Zener Diode TUNER D3403 RH-EX1271CEZZ J Zener Diode...
Page 58 LC-20B2EA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB152DE03 C1936 VCEAPF1HW225M J 2.2 Electrolytic C1937 VCEAPF1HW225M J 2.2 Electrolytic TUNER Unit(Continued) C1938 VCEAPF1CW106M J 10 Electrolytic C1939 VCKYTV1CF105Z Ceramic C1625 VCKYCY1EF104Z J 0.1 Ceramic C1940 VCKYTV1CF105Z...
Page 59 LC-20B2EA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB152DE03 R1664 VRS-CY1JF000J 1/16W Metal Oxide R1665 VRS-CY1JF000J 1/16W Metal Oxide TUNER Unit(Continued) R1668 VRS-CY1JF332J J 3.3k 1/16W Metal Oxide R1669 VRS-CB1JF332J J 3.3k 1/16W Metal Oxide...
Page 60 LC-20B2EA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB152DE03 R3964 VRS-CY1JF101J J 100 1/16W Metal Oxide R3965 VRS-CY1JF101J J 100 1/16W Metal Oxide TUNER Unit(Continued) R3966 VRS-CY1JF271J J 270 1/16W Metal Oxide R3967 VRS-CY1JF271J J 270 1/16W Metal Oxide R2214 VRS-CY1JF152J J 1.5k 1/16W Metal Oxide...
Page 61: Operation Unit
LC-20B2EA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB167DE02 DUNTKB155DE03 INVERTER A Unit R/C RECEIVER Unit DIODE TRANSISTORS Q4001 VSDTC144EE/-1 J DTC144EE D6700 VHDiMN10///-1 J Diode Q4003 VSDTC144EE/-1 J DTC144EE COILS Q4007 VSUMG4N++++-1Y J UMG4N++++...
Page 62 LC-20B2EA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB168DE02 CABINET PARTS LOCATION INVERTER B Unit TRANSISTORS CCABA2474CE01 J Front Cabinet Ass’y Not Available – Front Cabinet — Q6709 VSFZT1053A/-1 J FZT1053A GCOVA2020CEZZ J R/C, LED Cover...
Page 63 LC-20B2EA CABINET AND MECHANICAL PARTS CONTROL UNIT INVERTER-A UNIT 1-13 MAINL UNIT 1-11 1-12 INVERTER-B UNIT 1-12 1-13 1-10 RC/LED UNIT TUNER UNIT 5-10 5-20 5-19 5-12 5-11 5-16 5-17 5-18 5-21 5-15 5-14 5-19 5-20 5-13 3-14 3-10 3-13...
Page 64: Packing Parts
LC-20B2EA Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET PARTS LOCATION SUPPLLIED ACCESSORIES LANGT9032CEFW J Reinforcemnt Angle LHLDW0109CESA J Cable Clamp, x2 LX-BZ3442CEFF J Screw, x4 TiNS-7630CEZZ J Operation Manual PMLT-0404CEZZ J Spacer (L) TiNS-A427WJZZ...
Page 65: Packing Of The Set
LC-20B2EA PACKING OF THE SET Operation Manual (TiNS-7630CEZZ) (TiNS-A427WJZZ) Cable Clamp (2 pcs.) (LHLDW0109CESA) Guarantee Card (TGAN-A077WJZZ) #Polyethylene Bag # Dry Battery (2 pcs.) (SSAKA0160CEZZ) AC Adapter (UADP-0241CEPZ) AC Cord Wireless Remote Control (QACCK0006TAZZ ) (RRMCGA031WJSA) # Buffer Material (SPAKXA050WJZZ)
Page 66 LC-20B2EA 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.

Sharp LC-20B2EA Service Manual

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