Page 1: Table Of Contents
LC-20B2HA LC-20B2MA SERVICE MANUAL S62L1LC20B2HA LCD COLOUR TELEVISION LC-20B2HA LC-20B2MA 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-20B2HA LC-20B2MA IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be performed only by qualified service technicians who are thor- oughly 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-20B2HA LC-20B2MA Specifications Items LC-20B2HA/MA Model LCD panel 19.7” Advanced Super View & BLACK TFT LCD Number of dots 921,600 dots VGA Video colour system World multi system TV Standard I/DK/M/BG TV Turning System Auto preset tuning TV function STEREO/BILINGUAL...
Page 4: Operation Manual
LC-20B2HA LC-20B2MA Operation Manual Main unit (front view) Main unit (rear view) VIDEO VI DE O Upper control panel AUDIO (L) OU T AV-IN2/OUT AV -IN 2/ AUDIO (R) MENU TV/VIDEO MAIN POWER AU DI O NE NT CO M PO...
Page 5: Dimensions
LC-20B2HA LC-20B2MA Dimensions MENU TV/VIDEO MAIN POWER PRESET 1 401.3 POWER SLEEP 107.3 72.6 VIDEO AV-IN1 AUDIO VIDEO S-VIDEO AV-IN 2/OUT AUDIO HEAD PHONE COMPONENT ANT. POWER AUDIO INPUT DC13V 30.5 163.9 65.5 229.4 (Unit: mm)
Page 6: Removing Of Major Parts
LC-20B2HA LC-20B2MA 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-20B2HA LC-20B2MA 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 pcs.). 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-20B2HA LC-20B2MA » 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
Note: The 5.0 V level is used as reference for all the line voltages. Make this adjustment as precisely as possible. 5-2. Counter bias adjustment: COM BIAS on page 2 Adjust the "COM BIAS" setting until the contrast gets optimum (the black portion blackest). The adjustment guideline is around 91 for Model LC-20B2HA/MA.
Page 10 LC-20B2HA LC-20B2MA 5-3. TAMP adjustment 1) Feed the colour bar pattern signal. 2) See if the "Y" reading on adjustment process page 2 is within the range shown below. If not, adjust the "NTSC TAMP" setting to bring the "Y" reading within the specified range.
Page 11 LC-20B2HA LC-20B2MA [6] Lamp error detection 6-1. 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 LC-20B2HA LC-20B2MA • Setting screen of “PUBLIC MODE” PUBLIC MODE 1 ↔ 2 ··· ↔ 59 ↔ 60 MAXIMUM VOLUME VARIABLE ↔ FIXED VOLUME FIXED [VARIABLE] RESPOND ↔ LIMITED REMOTE CONTROL [RESPOND] RESPOND ↔ NO RESPOND USER CONTROL [RESPOND] YES ↔ NO...
Page 13: Trouble Shooting Table
LC-20B2HA LC-20B2MA TROUBLE SHOOTING TABLE No or Wrong Picture Does the IC801 test pattern appear properly? Does the IC1201 test pattern appear properly? Check the IC801 signal Are the waveforms at output line, IC801 itself pins (10), (11), (13), and its peripheral (15) and (17) of IC1201 circuits.
Page 14 LC-20B2HA LC-20B2MA TROUBLE SHOOTING TABLE (Continued)
Page 15 LC-20B2HA LC-20B2MA TROUBLE SHOOTING TABLE (Continued)
Page 16 LC-20B2HA LC-20B2MA TROUBLE SHOOTING TABLE (Continued)
Page 17 LC-20B2HA LC-20B2MA - M E M O -...
Page 18: Chassis Layout
LC-20B2HA LC-20B2MA CHASSIS LAYOUT MAIN Unit (Side A) MAIN Unit (Side B)
Page 19 LC-20B2HA LC-20B2MA OPERATION Unit R/C RECEIVER Unit INVERTER-A Unit INVERTER-B Unit TERMINAL Unit...
Page 20: Block Diagram
LC-20B2HA LC-20B2HA LC-20B2MA LC-20B2MA BLOCK DIAGRAMS TERMINAL UNIT MAIN UNIT TV-V TUNER TU3201 SIF-AMP. Q3201 Q3202 SY, SC S-VIDEO INPUT L1, R1 V2/VO SY, SC VIDEO TV-V DECODER VIDEO AV1 V (VPC) SWITCH AUDIO VIDEO L2, R2 IC801 INPUT IC402...
Page 21: Description Of Schematic Diagram
LC-20B2HA LC-20B2MA 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 22: Schematic Diagramë Operation And R/C Receiver Unit
LC-20B2HA LC-20B2MA SCHEMATIC DIAGRAM Ë OPERATION and R/C RECEIVER Unit OPERATION Unit R/C RECEIVER Unit...
Page 23: Ë Main Unit
LC-20B2HA LC-20B2HA LC-20B2MA LC-20B2MA Ë MAIN Unit -1/4 24~25...
Page 24 LC-20B2HA LC-20B2HA LC-20B2MA LC-20B2MA Ë MAIN Unit -2/4 26~27...
Page 25 LC-20B2HA LC-20B2HA LC-20B2MA LC-20B2MA Ë MAIN Unit -3/4 28~29...
Page 26 LC-20B2HA LC-20B2HA LC-20B2MA LC-20B2MA Ë MAIN Unit -4/4 30~31...
Page 27: Ë Terminal Unit
LC-20B2HA LC-20B2HA LC-20B2MA LC-20B2MA Ë TERMINAL Unit -1/2 å AND SHADED COMPONENTS=SAFETY RELATED PARTS å 32~33...
Page 28 LC-20B2HA LC-20B2HA LC-20B2MA LC-20B2MA Ë TERMINAL Unit -2/2 å AND SHADED COMPONENTS=SAFETY RELATED PARTS å 34~35...
Page 29: Ë Inverter-A Unit
LC-20B2HA LC-20B2MA Ë INVERTER-A Unit å AND SHADED COMPONENTS=SAFETY RELATED PARTS å å å...
Page 30: Ë Inverter-B Unit
LC-20B2HA LC-20B2MA Ë INVERTER-B Unit å AND SHADED COMPONENTS=SAFETY RELATED PARTS å å...
Page 31: Printed Wiring Board Assemblies
LC-20B2HA LC-20B2MA PRINTED WIRING BOARD ASSEMBLIES R/C Receiver Unit (Component Parts) Operation Unit (Component Parts) Inverter-A Unit (Component Parts) Inverter-B Unit (Component Parts)
Page 32 LC-20B2HA LC-20B2MA R/C Receiver Unit (Chip Parts) Operation Unit (Chip Parts) Inverter-A Unit (Chip Parts) Inverter-B Unit (Chip Parts)
Page 33 LC-20B2HA LC-20B2MA Terminal Unit (Component Parts)
Page 34 LC-20B2HA LC-20B2MA Terminal Unit (Chip Parts)
Page 35 LC-20B2HA LC-20B2MA Main Unit (Component parts Side-A)
Page 36 LC-20B2HA LC-20B2MA Main Unit (Component Parts Side-B)
Page 37 LC-20B2HA LC-20B2MA Main Unit (Chip Parts Side-A)
Page 38 LC-20B2HA LC-20B2MA Main Unit (Chip Parts Side-B)
Page 39: Parts List
LC-20B2HA LC-20B2MA PARTS LIST Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE15 PARTS REPLACEMENT MAIN Unit Replacement parts which have these special safety character- INTEGRATED CIRCUITS istics identified in this manual: electrical components having IC401...
Page 40 LC-20B2HA LC-20B2MA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE15 C835 VCEASM1CW107MY J 100 16V Electrolytic C836 RC-KZ1025CEZZ 10V Ceramic MAIN Unit (Continued) C837 RC-KZ1025CEZZ 10V Ceramic C838 VCEASM0GW107MY J 100 Electrolytic PACKAGED CIRCUITS C839...
Page 41 LC-20B2HA LC-20B2MA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE15 R905 VRS-CY1JF105J J 1M 1/16W Metal Oxide AA MAIN Unit (Continued) R1001 VRS-CY1JF102J J 1k 1/16W Metal Oxide AA R1002 VRS-CY1JF103F J 10k 1/16W Metal Oxide AA...
Page 42 LC-20B2HA LC-20B2MA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA670FE15 R2009 VRS-CY1JF102J J 1k 1/16W Metal Oxide AA MAIN Unit (Continued) R2010 VRS-CY1JF101J J 100 1/16W Metal Oxide AA R2011 VRS-CB1JF101J J 100 1/16W Metal Oxide AA...
Page 43: Ë Terminal Unit
LC-20B2HA LC-20B2MA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB167DE03 TRANSFORMERS INVERTER-A Unit (Continued) å T6706 RTRNZ0806CEZZQ J Transformer å T6707 RTRNZ0806CEZZQ J Transformer TRANSFORMERS å T6708 RTRNZ0806CEZZQ J Transformer å T6700 å T6709 RTRNZ0806CEZZQ J Transformer RTRNZ0806CEZZQ J Transformer å...
Page 44 LC-20B2HA LC-20B2MA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB237DE03 C3304 VCKYCY1HB392K J 3900p 50V Ceramic C3305 VCKYCY1HB392K J 3900p 50V Ceramic TERMINAL Unit (Continued) C3306 VCKYCY1EB822K J 8200p 25V Ceramic C3308 VCKYCY1EF104Z J 0.1...
Page 45 LC-20B2HA LC-20B2MA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB237DE03 R3321 VRS-CY1JF103F J 10k 1/16W Metal Oxide AA R3322 VRS-CY1JF123J J 12k 1/16W Metal Oxide AA TERMINAL Unit (Continued) R3323 VRS-CY1JF103F J 10k 1/16W Metal Oxide AA...
Page 46: Ë Operation Unit
LC-20B2HA LC-20B2MA Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB237DE03 R3761 VRS-CY1JF272J J 2.7k 1/16W Metal Oxide AA TERMINAL Unit (Continued) R3762 VRS-TW2ED561J J 560 1/4W Metal Oxide AA R3766 VRS-CY1JF472J J 4.7k 1/16W Metal Oxide AA...
Page 47: Ë Cabinet Parts List
PMLT-0404CEZZ J MLT (L) (LC-20B2MA(XA)) PMLT-0405CEZZ J MLT (R) Not Available - Rear Cabinet — HiNDPA023WJSA J Model Label (LC-20B2HA) AC HiNDPA024WJSA J Model Label (LC-20B2MA) ACCESSORIES PARTS HiNDPA101WJSA J Model Label (LC-20B2MA(XA)) CDAi-1122CE05 J Stand Ass’y QCNWG0008CEPZ J Antenna Cable...
Page 48: Ë Cabinet And Mechanical Parts
LC-20B2HA LC-20B2MA CABINET AND MECHANICAL PARTS Ref. No. Part No. Description Code Ref. No. Part No. Description Code OPERATION Unit 1-13 1-10 1-12 INVERTER-A 1-13 1-10 MAIN PwB 1-12 INVERTER-B R/C RECEIVER Unit TERMINAL PwB...
Page 49 LC-20B2HA LC-20B2MA Ref. No. Part No. Description Code Ref. No. Part No. Description Code 3-11 3-17 3-18 3-13 3-13 3-14 3-10 3-12 3-17 3-17 3-14 3-16 3-19 3-15...
Page 50: Packing Of The Set
(TiNS-A008CEZZ(LC-20B2HA)) (TiNS-A011CEZZ(LC-20B2MA/LC-20B2MA(XA))) Cable Clamp (2 pcs.) (LHLDW0109CESA) Dry Battery (2 pcs.) Polyethylene Bag (SSAKA0160CEZZ) AC Adapter (UADP-0241CEPZ) AC Cord Wireless Remote Control (QACCB0016TAZZ (LC-20B2HA)) (RRMCG1663CESA) (QACCK0002TAZZ (LC-20B2MA)) (QACCL0020TAZZ (LC-20B2MA(XA))) Antenna Cable (QCNWG0008CEPZ ) Buffer Material (SPAKXA050WJZZ) Wrapping Paper (SPAKPA001WJZZ) Label...
Page 51 Part No. Description Code © 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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