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Sharp LC-20S1M Service Manual

Lcd colour television
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In the interests of user-safety (Required by safety regulations in some countries) the set should be re-
stored to its original condition and only parts identical to those specified should be used.
» IMPORTANT SERVICE SAFETY PRECAUTION ........................................................................................ 2
» SPECIFICATIONS ........................................................................................................................................4
» OPERATION MANUAL .................................................................................................................................5
» DIMENSIONS ...............................................................................................................................................7
» REMOVING OF MAJOR PARTS ..................................................................................................................8
» ADJUSTING PROCEDURE OF EACH SECTION ..................................................................................... 12
» TROUBLE SHOOTING TABLE ...................................................................................................................18
» CHASSIS LAYOUT .....................................................................................................................................22
» BLOCK DIAGRAM ......................................................................................................................................24
» OVERALL WIRING DIAGRAM ...................................................................................................................26
» DESCRIPTION OF SCHEMATIC DIAGRAM ............................................................................................. 28
» SCHEMATIC DIAGRAM ............................................................................................................................. 29
» PRINTED WIRING BOARD ASSEMBLIES ................................................................................................52
» REPLACEMENT PARTS LIST .................................................................................................................... 63
» PACKING OF THE SET ..............................................................................................................................75
SERVICE MANUAL
LCD COLOUR TELEVISION
MODEL
CONTENTS
SHARP CORPORATION
LC-20S1M
LC-20S1M
S73F5LC-20S1M
Page

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Summary of Contents for Sharp LC-20S1M

  • Page 1: Table Of Contents

    LC-20S1M SERVICE MANUAL S73F5LC-20S1M LCD COLOUR TELEVISION LC-20S1M MODEL In the interests of user-safety (Required by safety regulations in some countries) the set should be re- stored to its original condition and only parts identical to those specified should be used.

  • Page 2: Important Service Safety Precaution

    LC-20S1M IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be performed 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 LC-20S1M Precautions for using lead-free solder 1 Employing lead-free solder "All PWBs" 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 4: Specifications

    Remote control, Battery ( 2), Antenna cable, AC adapter, AC cord, Cable clamp, Operation manual 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...

  • Page 5: Operation Manual

    LC-20S1M OPERATION MANUAL...
  • Page 6 LC-20S1M...

  • Page 7: Dimensions

    LC-20S1M DIMENSIONS Unit: mm PRESET 1 403.3...

  • Page 8: Removing Of Major Parts

    LC-20S1M REMOVING OF MAJOR PARTS 1. Remove the stand fixing screws (4 pcs.). 2. Remove the terminal cover. 3. Remove the terminal section fixing screws (3 pcs.). 4. Remove the cabinet B fixing screws (9 pcs.). 5. Remove the cabinet B after opening from the direction of an arrow.
  • Page 9 LC-20S1M 8. Remove the 3 lock screws from the main PWB and undo the hooks a and b. Lifting the other PWBs close to the hooks, draw out the main PWB. 9. Remove the 4 lock screws from the sub PWB and undo the hooks c and d. Detach the chassis frame (right), together with its terminals, from the sub PWB.
  • Page 10 LC-20S1M » 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 electro-conductive mat. 4. Be careful not to fall, shake and shock the panels.
  • Page 11 LC-20S1M Precautions at the time of the side B(back) service of Main unit. 1. Remove the FFC for connection between Main unit (SC2001) and Sub unit(SC3401), and connect the extended cable (QCNW-A556WJZZ) for service. 2. Remove only SC1204 of the FFC for connection between Main unit (SC1204) and LCD panel unit, and connect the extended cable (QCNW-A553WJZZ) for service.

  • Page 12: Adjusting Procedure Of Each Section

    LC-20S1M 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 exclusive-use AC adapter or stable DC power supply.
  • Page 13 LC-20S1M 5. Adjustment 5-1. +B adjustment (R3710 Variable resistor) 1) Receive the colour bar signal. 2) Adjust the voltage at pin (4) of P3701 to 5.00 ± 0.02 V. Note: The 5.0 V level is used as reference for all the line voltages. Make this adjustment as precisely as possible.
  • Page 14 LC-20S1M 5-5. Other adjustments (SOUND, VPC, DPS, DAC, TUNER, OTHERS, TEXT) 1) Move the cursor to a desired item on page 4 of adjustment process menu. Press the CURSOR LEFT/ RIGHT keys, "VOL (+)/(–)" keys or OK key to select the item.
  • Page 15 LC-20S1M 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 16 LC-20S1M 7. Public mode • How to enter into PUBLIC MODE 1. Turn off TV by pressing MAIN POWER switch. 2. While pressing "VOL(+)" key and "CH(ù)" key at the same time, press MAIN POWER switch for more than 2 seconds.
  • Page 17 LC-20S1M 9. SOUND ONLY MODE (NO↔YES) (* This item cannot be selected if "NO" appears on the on-screen display.) Let's suppose that this item has been selected and the BRIGHT key on the remote control has been pressed. The item "BRIGHTNESS [OFF]" can now be selected next to the item "BRIGHTNESS [DARK]".

  • Page 18: Trouble Shooting Table

    LC-20S1M 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 (8), (9), (26) and and its peripheral (27) of IC1201 circuits.
  • Page 19 LC-20S1M TROUBLE SHOOTING TABLE (Continued)
  • Page 20 LC-20S1M TROUBLE SHOOTING TABLE (Continued)
  • Page 21 LC-20S1M TROUBLE SHOOTING TABLE (Continued)

  • Page 22: Chassis Layout

    LC-20S1M CHASSIS LAYOUT INVERTER Unit SUB Unit R/C, LED Unit...
  • Page 23 LC-20S1M MAIN Unit...

  • Page 24: Block Diagram

    LC-20S1M BLOCK DIAGRAM...
  • Page 25 LC-20S1M...

  • Page 26: Overall Wiring Diagram

    LC-20S1M OVERALL WIRING DIAGRAM...
  • Page 27 LC-20S1M...

  • Page 28: Description Of Schematic Diagram

    LC-20S1M DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: 1. The voltages at test points are measured on exclusive AC adaptor and the stable 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 29: Schematic Diagram

    LC-20S1M SCHEMATIC DIAGRAM Ë R/C, LED Unit...
  • Page 30 LC-20S1M Ë MAIN Unit-1/6...
  • Page 31 LC-20S1M...
  • Page 32 LC-20S1M Ë MAIN Unit-2/6...
  • Page 33 LC-20S1M...
  • Page 34 LC-20S1M Ë MAIN Unit-3/6...
  • Page 35 LC-20S1M...
  • Page 36 LC-20S1M Ë MAIN Unit-4/6...
  • Page 37 LC-20S1M...
  • Page 38 LC-20S1M Ë MAIN Unit-5/6...
  • Page 39 LC-20S1M...
  • Page 40 LC-20S1M Ë MAIN Unit-6/6...
  • Page 41 LC-20S1M...
  • Page 42 LC-20S1M Ë SUB Unit-1/4 (LC-20S1M)
  • Page 43 LC-20S1M...
  • Page 44 LC-20S1M Ë SUB Unit-1/4 (LC-20S1M(X))
  • Page 45 LC-20S1M...
  • Page 46 LC-20S1M Ë SUB Unit-2/4...
  • Page 47 LC-20S1M...
  • Page 48 LC-20S1M Ë SUB Unit-3/4...
  • Page 49 LC-20S1M...
  • Page 50 LC-20S1M Ë SUB Unit-4/4...
  • Page 51 LC-20S1M Ë INVERTER Unit...

  • Page 52: Printed Wiring Board Assemblies

    LC-20S1M PRINTED WIRING BOARD ASSEMBLIES MAIN Unit (Side-A)
  • Page 53 LC-20S1M SC2001 TP2002 R2048 X1601 C2013 R2049 R1627 C1629 R1635 C1639 C1632 R1640 R2064 R1641 R2069 R1645 IC1601 C1643 R2099 R2074 R1638 C2022 R2075 R2111 R2097 R1663 R2110 R2101 R1637 R2129 R2056 C1634 R1631 C1628 C1630 R1632 R1630 C1633 C2006...
  • Page 54 LC-20S1M MAIN Unit (Side-B)
  • Page 55 LC-20S1M R2023 R1616 R1657 Q1606 C1644 D2001 R1621 R1603 R2057 R1647 C1649 R2060 R2038 R2065 R2062 Q2001 R2055 R2067 Q1604 R2059 R2014 D2002 IC2006 R1604 R1622 C2020 Q2005 R1607 R2124 R2100 C2031 R2054 R2076 R2034 R2032 D2003 R2078 C2023 R2083...
  • Page 56 LC-20S1M...
  • Page 57 LC-20S1M SUB Unit (Side-A)
  • Page 58 LC-20S1M R4051 R4050 SW4054 SW4052 SW4051 SW4050 SW4055 R4052 C3710 R3337 R3336 R3339 R3338 L3202 L3701 C3325 L3704 L6500 R3335 C3324 C3718 Q3701 R3775 R3774 C3208 FB3703 R3340 C3720 T3701 D3708 R3717 C3712 FB3706 R3402 Q3702 D3710 R3739 Q3703 R3732...
  • Page 59 LC-20S1M R4053 SW4055 SW4056 P6500 R4052 Q6501 Q6500 L6500 R6510 R6500 L6502 C3720 C6502 Q6506 R6511 Q6502 R6503 Q6504 L3703 C6505 T6502 L6503 R6507 C6508 Q6503 C3738 R6506 R6514 R6504 C3736 C6512 C6504 C6509 C6507 L3702 R3777 R3734 R3776 P3604...
  • Page 60 LC-20S1M TL6709 TL6708 TL6711 TL6710 TL6712 TL6713 TL6718 TL6028 TL6719 TL6720 TL6029 TL6031 TL6700 TL6701 TL6702 TL6703 TL6704 TL6705 TL6706 TL6018 TL6707 TL6020 TL6023 TL6019 TL6021 R6703 C6711 C6703 R6702 D6703 R6710 C6707...
  • Page 61 LC-20S1M INVERTER Unit (Side-A) TL6716 TL6712 TL6715 TL6714 TL6717 TL6713 TL6720 TL6030 TL6721 TL6032 TL6722 TL6031 TL6022 TL6027 TL6023 TL6024 TL6026 R6740 TL6025 R6742 C6725 R6748 R6731 R6728 C6727 R6724 C6722 R6730 C6726 D6708 R6723 C6729 R6733 INVERTER Unit (Side-B)
  • Page 62 LC-20S1M R/C, LED Unit (Side-A) (QPWBSB982WJN1) C4202 P4001 P4003 D4005 C4001 C4201 D4007 D4004 R4007 R4001 Q4002 IC4201 D4001 D4002 J4021 R4005 R4002 R4003 D4006 R/C, LED Unit (Chip Parts Side-A) (QPWBSB982WJN1)

  • Page 63: Replacement Parts List

    D4052 RH-EX1271CEZZY J Zener Diode, 12V NOTE: THE PARTS HERE SHOWN ARE SUPPLIED AS AN PACKAGED CIRCUITS ASSEMBLY BUT NOT INDEPENDENTLY. X3301 RCRSB0307CEZZ J Crystal, 18.432MHz TU3201 VTUVT2U5CD553 J Tuner(LC-20S1M) TU3201 VTUVT2U5CD558 J Tuner(LC-20S1M(X)) COILS INTEGRATED CIRCUITS L3201 VP-1M220J2R9NY J Peaking 22µH...
  • Page 64 LC-20S1M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB981DE12(LC-20S1M) C3355 VCCCCY1HH560JY J 56p Ceramic DUNTKB981DE15(LC-20S1M(X)) C3356 VCCCCY1HH560JY J 56p Ceramic C3357 VCCCCY1HH5R0CY J 5p Ceramic SUB UNIT (Continued) C3358 VCCCCY1HH5R0CY J 5p Ceramic CONTROL C3359 RC-KZA041WJZZY J 10...
  • Page 65 LC-20S1M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB981DE12(LC-20S1M) R3350 VRS-CY1JF102JY J 1k 1/16W Metal Oxide DUNTKB981DE15(LC-20S1M(X)) R3351 VRS-CY1JF104JY J 100k 1/16W Metal Oxide R3354 VRS-CY1JF101JY J 100 1/16W Metal Oxide SUB UNIT (Continued) R3357 VRS-CY1JF105JY...
  • Page 66 LC-20S1M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB981DE12(LC-20S1M) SC3411 QSOCD0456CEZZ J S-VIDEO(AV-IN1) DUNTKB981DE15(LC-20S1M(X)) SC3412 QSOCD0456CEZZ J S-VIDEO(AV-IN2/OUT) TP3001 QLUGHA001WJZZY J Lug SUB UNIT (Continued) TP3002 QLUGHA001WJZZY J Lug TP3003 QLUGHA001WJZZY J Lug R3738 VRS-CY1JF223JY...
  • Page 67 LC-20S1M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB983FE03 C6728 RC-EZA010WJZZ J 1000 Electrolytic C6729 RC-KZ0072TAZZY Ceramic INVERTER UNIT RESISTORS TRANSISTORS R6700 VRS-TW2ED122JY J 1.2k 1/4W Metal Oxide R6701 VRS-TW2ED122JY J 1.2k 1/4W Metal Oxide...
  • Page 68 LC-20S1M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB988FE12 D709 VHDDAN222//-1Y J Diode D710 VHDDAN202K/-1Y J Diode MAIN UNIT D711 VHD1SS250//1EY J Diode D712 VHDDAN222//-1Y J Diode INTEGRATED CIRCUITS D713 VHDRB481K++-1Y J Diode D714 VHDRB491D++-1Y...
  • Page 69 LC-20S1M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB988FE12 C1202 VCKYCY1EF104ZY J 0.1 Ceramic C1203 VCKYCY1EF104ZY J 0.1 Ceramic MAIN UNIT (Continued) C1204 VCKYCY1EF104ZY J 0.1 Ceramic C1205 VCKYCY1EF104ZY J 0.1 Ceramic C1206 VCCCCY1HH7R0DY J 7p...
  • Page 70 LC-20S1M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB988FE12 R1106 VRS-CY1JF102JY J 1k 1/16W Metal Oxide R1107 VRS-CY1JF391JY J 390 1/16W Metal Oxide MAIN UNIT (Continued) R1108 VRS-TW2ED102JY J 1k 1/4W Metal Oxide R1109 VRS-TW2ED5R6JY J 5.6...
  • Page 71 LC-20S1M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB988FE12 R2095 VRS-CA1JF101JY J 100 1/16W Metal Oxide R2096 VRS-CB1JF101JY J 100 1/16W Metal Oxide MAIN UNIT (Continued) R2097 VRS-CA1JF101JY J 100 1/16W Metal Oxide R2099 VRS-CY1JF472JY J 4.7k 1/16W Metal Oxide...
  • Page 72 PSPAHA213WJZZ J Spacer, x1 QCNW-B521WJQZ J Connecting Cord(SP) VSP7040PB608S J Speaker, x2 XEBSN40P10000 J Screw, x8 CCABBA264WJ02 J Cabinet B Ass’y(LC-20S1M) BD CCABBA264WJ03 J Cabinet B Ass’y (LC-20S1M(X)) Not Available – Cabinet B — GLEGGA026WJSA J Rubber Leg, x2 HiNDPA532WJSA...
  • Page 73 LC-20S1M CABINET AND MECHANICAL PARTS 4-3-4 4-3-6 4-3-5 4-3-2 4-3-1 4-3-4 4-3-8 4-3-7 4-3-3 4-3-9 R/C,LED PWB 4-3-5 4-2-1 4-2-1 4-2-1 4-10 4-2-1 4-2-1 4-13 4-12 4-11 4-13 3-1-3 3-1-1 3-1-2 2-2 2-9 SUB PWB MAIN PWB INVERTER PWB...
  • Page 74 PACKING PARTS ACCESSORIES (NOT REPLACEMENT ITEM) LHLDWA002WJSB J Cable Clamp, x1 SPAKCA843WJZZ – Packing Case — å QACCKA006WJPZ J AC Cord(LC-20S1M) SPAKFA310WJZZ – Buffer Material(Accessories) — å QACCL0026TAZZ J AC Cord(LC-20S1M(X)) SPAKPA226WJZZ – Wrapping Paper — QCNWG0008CEPZ J Antenna Cable SPAKXA336WJZZ –...

  • Page 75: Packing Of The Set

    LC-20S1M PACKING OF THE SET Polyethylene Bag (SSAKA0160CEZZ) Operation Manual (TiNS-A896WJZZ) Cable Clamp (1pc.) (LHLDWA002WJSB) Infrared R/C Unit "AAA" size Battery (2pcs.) (RRMCGA160WJSA) AC Adapter (UADP-A043WJPZ) AC Cord (QACCKA006WJPZ:LC-20S1M) (QACCL0026TAZZ:LC-20S1M(X)) Buffer Material (Accessories) Antenna Cable (SPAKFA310WJZZ) (QCNWG0008CEPZ) Wrapping Paper (SPAKPA226WJZZ)
  • Page 76 LC-20S1M COPYRIGHT © 2003 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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