Sharp LC-20M4U Service Manual
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Sharp LC-20M4U Service Manual

Sharp LC-20M4U Service Manual

Lcd av monitor sharp lc-20m4u
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Download this manual See also: Operating Manual
» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................. 2
» SPECIFICATIONS ................................................................................................................................ 4
» OPERATION MANUAL ......................................................................................................................... 5
» DIMENSIONS ....................................................................................................................................... 6
» REMOVING OF MAJOR PARTS .......................................................................................................... 7
» ADJUSTING PROCEDURE OF EACH SECTION ............................................................................. 10
» TROUBLE SHOOTING TABLE ........................................................................................................... 13
» CHASSIS LAYOUT ............................................................................................................................. 18
» BLOCK DIAGRAMS ........................................................................................................................... 20
» DESCRIPTION OF SCHEMATIC DIAGRAM ..................................................................................... 22
» SCHEMATIC DIAGRAMS ................................................................................................................... 23
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 45
Ë ELECTRICAL PARTS ..................................................................................................................... 50
MAIN UNIT ..................................................................................................................................... 50
JACK UNIT ..................................................................................................................................... 56
INVERTER UNIT ............................................................................................................................ 57
SWITCH UNIT ................................................................................................................................ 57
Ë CABINET PARTS LIST ................................................................................................................... 59
Ë SUPPLIED ACCESSORIES PARTS .............................................................................................. 59
Ë PACKING PARTS ........................................................................................................................... 59
Ë CABINET AND MECHANICAL PARTS .......................................................................................... 60
» PACKING OF THE SET ...................................................................................................................... 62
SHARP CORPORATION
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
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
1
SY1E1LC-20M4U
LCD AV MONITOR
LC-20M4U
Page
LC-20M4U

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  • Page 1: Table Of Contents

    LC-20M4U SERVICE MANUAL SY1E1LC-20M4U LCD AV MONITOR LC-20M4U 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-20M4U 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 LC-20M4U PRECAUTIONS A PRENDRE LORS DE LA REPARATION Ë Ne peut effectuer la réparation qu’ un technicien spécialisé qui s’est parfaitement accoutumé à toute vérification de sécurité et aux conseils suivants. • Utiliser un voltmètre CA d’une sensibilité d’au moins AVERTISSEMENT 5000Ω/V pour mesurer la chute de tension en travers...

  • Page 4: Specifications

    LC-20M4U SPECIFICATIONS Items ............20" LCD AV MONITOR, Model: LC-20M4U LCD panel ..................20" BLACK TFT LCD Number of dots ..............921,600 (640 x 3 x 480) dots Low reflection ....................Non-glare Brightness ....................... 430 cd/m Viewing angles Left to right ......................160°...

  • Page 5: Operation Manual

    LC-20M4U OPERATION MANUAL Main unit (front view) Main unit (rear view) Remote Control...

  • Page 6: Dimensions

    LC-20M4U DIMENSIONS (Unit: inch/mm)

  • Page 7: Removing Of Major Parts

    LC-20M4U REMOVING OF MAJOR PARTS 1. Detach the Rear cover. 2. Remove the Table stand fixing screws (4 pcs.). 3. Remove the Jack PWB fixing screws (9 pcs.) . 4. Remove the Cabinet B fixing screws (5 pcs.). 5. Push on the...
  • Page 8 LC-20M4U 8. Remove the Main PWB fixing screws (4 pcs.). 9. Remove the Inverter PWB fixing screws (3 pcs.). 10. Remove the Jack PWB fixing screw (1 pc.) and Ground fixing screw (1 pc.), and then remove the Reinforcement plate.
  • Page 9 LC-20M4U » 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 10: Adjusting Procedure Of Each Section

    Use a dedicated AC adapter or a regulated DC power supply. AC adapter :UADP-0220CEZZ DC power supply :13 V, 3.8 A Use also a SHARP TV remote controller. 1. Adjustment procedure Power on (initialization) Adjustment process mode (remote controller) +B adjustment...

  • Page 11: White Balance Adjustment

    LC-20M4U 1-3. Counter bias adjustment Keep off the video input signal. Place the specified tool at the center of the screen. Observe the output of the tool on the oscilloscope screen. Adjust the “COM BIAS” setting on the adjustment process page 2 so that the peak-to-peak level of the waveform should be minimum.
  • Page 12 LC-20M4U 2. Lamp error detection Function For added safety, this LCD color TV set has the lamp error detection. The power is automatically turned off if the lamp or its circuit gets in trouble. If by any chance there is a problem with the lamp or its circuit, or if the lamp error detection function is activated for any other reason, the set behaves itself as follows.

  • Page 13: Trouble Shooting Table

    LC-20M4U TROUBLE SHOOTING TABLE...

  • Page 14: Trouble Shooting Table

    LC-20M4U TROUBLE SHOOTING TABLE (Continued)
  • Page 15 LC-20M4U TROUBLE SHOOTING TABLE (Continued)
  • Page 16 LC-20M4U TROUBLE SHOOTING TABLE (Continued)
  • Page 17 LC-20M4U TROUBLE SHOOTING TABLE (Continued)

  • Page 18: Chassis Layout

    LC-20M4U CHASSIS LAYOUT MAIN Unit (Side-A) MAIN Unit (Side-B)
  • Page 19 LC-20M4U JACK Unit INVERTER Unit SWITCH Unit...

  • Page 20: Block Diagrams

    LC-20M4U LC-20M4U BLOCK DIAGRAM JACK PWB MAIN PWB QCNW- A270WJZZ PWB GND PANEL SHELD SC OUT 3.3V Reg SCREW SY OUT IC7701 IC903 YC IN 2.5V Reg SC4401 LCD UNIT IC7702 IC901 3-D Y/C SEPARATION 2.5V Reg REVERSE VIDEO IN...

  • Page 21: Description Of Schematic Diagram

    LC-20M4U DESCRIPTION OF SCHEMATIC DIAGRAM IMPORTANT SAFETY NOTICE: AVIS DE SECURITE IMPORTANT: å PARTS MARKED WITH " "( ) ARE LES PIECES MARQUEES "å " ( ) SONT INPORTANT FOR MAINTAINING THE SAFETY OF IMPORTANTES POUR MAINTENIR LA SECURITE THE SET.

  • Page 22: Schematic Diagrams

    LC-20M4U SCHEMATIC DIAGRAMS Ë SWITCH Unit...
  • Page 23 LC-20M4U LC-20M4U SCHEMATIC DIAGRAMS å AND SHADED COMPONENTS=SAFETY RELATED PARTS Ë MAIN Unit -1/9 R366 6.8K 10u/16V/APFN C360 AV1_L R367 6.8K AV1_R 10u/16V/APFN C361 V2_V B8V30MA R354 SC401 N0487FJ V1_V R355 V1_V AV1_L V1_L Q353 C351 AV1_R V1_R VSUMG4 A_IN/OUT...
  • Page 24 LC-20M4U LC-20M4U Ë MAIN Unit -2/9 B8V30MA B9V200MA SSTBY FRSP R328 100K PA_GND C311 R305 R304 0.1u R327 C314 C313 8.2/1/2W C309 R333 FLSP 1000P 2200u/16V/A4U 1u/16V/TV C310 C312 PAVCC 47u/16V/APFN 100u/16V/APFN AGND AGND AGND 13.5 AGND V2_RO V2_LO R308...
  • Page 25 LC-20M4U LC-20M4U Ë MAIN Unit -3/9 å AND SHADED COMPONENTS=SAFETY RELATED PARTS B8V30MA B29V10MA B9V200MA B5V500MA B12V1A BTU5V B-8V1A R740 R739 R738 R701 47KF 6.2KF 10KF Q707 31.4 AGND C2712Y R702 Q701 R737 31.9 1K/1/4W DTC144EE D704 C735 R752 13.2...
  • Page 26 LC-20M4U LC-20M4U Ë MAIN Unit -4/9 Q1774 DTC114YE R1777 OFL1 AGND P1771 N0278GE AGND INV_GND D1702 AGND 12.2 R1703 Q1703 UPA606T IMN10 12.1 820KR4 D1703 AGND LERR AGND IMN10 AGND R1707 14.6 D1701 AGND 12.1 P1701 R1702 12.2 LAMP GND...
  • Page 27 LC-20M4U LC-20M4U Ë MAIN Unit -5/9 4.97 R374 Q373 DDCRESET DDCRESET DTC144EE R371 R372 MPCLK MPCLK MPDA Q371 MPDA AGND MPCS MPCS MPRDA R2022 MPRDA HPDET MPRCS HPDET MPRCS 100R2 C2009 4.97 0.1u OSDHD R2043 OSDHD OSDVD DTC144EE OSDVD 100R4...
  • Page 28 LC-20M4U LC-20M4U Ë MAIN Unit -6/9 VACT 10u/16V/APFN VACT FIELD FIELD C801 C802 0.1u R801 R802 R803 +9V200MA AGND AGND R413 R406 R836 C803 C804 C404 3.3K 47u/6.3V/APF C806 1u/10V/KZ1025 1u/10V/KZ1025 B5V500MA Q401 X801 DGND R408 3.3K C0012CE C805 C2712Y C403 20.25MHz...
  • Page 29 LC-20M4U LC-20M4U Ë MAIN Unit -7/9 B9V200MA B5V500MA B12V1A B-8V1A R1153 R1150 R1104 33KR2 R1116 10KF C1124 R1151 0.1u 10.0 10KF AGND AGND C1110 IC1106 R1152 CONTROL C1109 10.0 0.1u NJM4580V DAC1CS C1103 0.1u MPCLK 0.1u IC1105 C1125 IC1102 -9.3...
  • Page 30 LC-20M4U LC-20M4U Ë MAIN Unit -8/9 RESET L1204 22uH/1M C1212 VACT VACT 0.1u LLC1 IC1201 0 0.9 1.0 0.3 0.3 3.2 0 0 3.2 0 2.7 0 1.6 0.9 0.1 0 0 0.5 0 0.1 LLC1 Q1201 FIELD AGND AGND DTC144EE B-5.5V...
  • Page 31 LC-20M4U LC-20M4U Ë MAIN Unit -9/9 IC7004 PST600IM R7042 330 SCL1 R7043 330 FL7102 N0079GE SDA1 R7010 R7008 Q7003 C7028 A1037KQ 0.1u FB7104 R7006 R7049 C7087 FL7101 B9V200MA 4.7k 0.1u C7027 0059CE N0079GE 1u/16V/TV VISY C7085 TP7001 TP7002 FB7103 0.01u...
  • Page 32 LC-20M4U LC-20M4U Ë INVERTER Unit å AND SHADED COMPONENTS=SAFETY RELATED PARTS L1702 L1701 å C0107CE C0107CE C1707 33uH 33uH T1701 Z0776CE Q1701 0.15u/100V/FZ0175 Q1702 C1701 A1037KQ 470u/16V/APW FZT1053A R1703 3.3K/1/4W R1702 8.2K C1706 0.15u/100V/FZ0175 R1701 P1703 N0165FJ C1703 INV GND 0.039u...
  • Page 33 LC-20M4U Ë JACK Unit å AND SHADED COMPONENTS=SAFETY RELATED PARTS J4302 FB4301 G0050CE 0059CE V2_L AUDIO L R4301 RCA WHITE FB4302 100k 0059CE V2_R AV2 INPUT AUDIO R OUTPUT RCA RED R4302 FB4401 100k 0059CE J4402 V2_V VIDEO D4401 R4401...

  • Page 34: Printed Wiring Board Assemblies

    LC-20M4U PRINTED WIRING BOARD ASSEMBLIES INVERTER Unit (Side-A) INVERTER Unit (Side-B)
  • Page 35 LC-20M4U MAIN Unit (Side-A)
  • Page 36 LC-20M4U MAIN Unit (Side-B)
  • Page 37 LC-20M4U JACK Unit (Side-A) JACK Unit (Side-B)
  • Page 38 LC-20M4U SWITCH Unit (Side-A) SWITCH Unit (Side-B)

  • Page 39: Parts List

    4. DESCRIPTION 3. NO. DE PIECE 4. DESCRIPTION in USA : Contact your nearest SHARP Parts Distributor to order. For in CANADA : Contact SHARP Electronics of Canada Limited Phone location of SHARP Parts Distributor, Please call Toll-Free: (416) 890-2100...
  • Page 40 LC-20M4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB031DE04 D1701 VHDiMN10///-1Y J IMN10 MAIN PWB UNIT(Continued) D1702 VHDiMN10///-1Y J IMN10 D1703 VHDiMN10///-1Y J IMN10 IC7201 VHiMM1031XM-1Y J MM1031XM D1704 VHDiMN10///-1Y J IMN10 IC7202 VHiNJM2235M-1Y J NJM2235M...
  • Page 41 LC-20M4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB031DE04 C808 VCCCCY1HH331JY J 330p 50V Ceramic MAIN PWB UNIT(Continued) C809 VCEAPK1CN107MY J 100 16V Electrolytic C810 VCKYCY1EF104ZY J 0.1 25V Ceramic C328 RC-EZ1274CEZZ J 1000 16V Electrolytic...
  • Page 42 LC-20M4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB031DE04 C7005 VCEAPF1CN106MY J 10 16V Electrolytic MAIN PWB UNIT(Continued) C7006 VCKYCY1EF104ZY J 0.1 25V Ceramic C7007 VCCCCY1HH1R0CY J 1p 50V Ceramic C982 RC-EZ0417CEZZY J 150 16V Electrolytic C7008 VCKYCY1EF104ZY J 0.1...
  • Page 43 LC-20M4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB031DE04 R457 VRS-CY1JF680JY J 68 1/16W Metal Oxide AA MAIN PWB UNIT(Continued) R458 VRS-CY1JF272JY J 2.7k 1/16W Metal Oxide AA R477 VRS-CY1JF000JY 1/16W Metal Oxide AA R309 VRS-TW2ED222JY J 2.2k 1/4W...
  • Page 44 LC-20M4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB031DE04 R1135 VRS-CY1JF561JY J 560 1/16W Metal Oxide AA MAIN PWB UNIT(Continued) R1136 VRS-CY1JF000JY 1/16W Metal Oxide AA R1137 VRS-CY1JF000JY 1/16W Metal Oxide AA R812 VRS-CY1JF000JY 1/16W Metal Oxide AA...

  • Page 45: Jack Unit

    LC-20M4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB031DE04 FB706 RBLN-0051TAZZY J Balun, BLN-0051TA MAIN PWB UNIT(Continued) FB707 RBLN-0051TAZZY J Balun, BLN-0051TA FB708 RBLN-0051TAZZY J Balun, BLN-0051TA R2047 VRS-CA1JF000JY 1/16W Metal Oxide AB FB709 RBLN-0095CEZZY J Balun, BLN-0095CE...

  • Page 46: Inverter Unit

    LC-20M4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB035DE01 R1706 VRS-TW2ED332JY J 3.3k 1/4W Metal Oxide AB JACK PWB UNIT(Continued) MISCELLANEOUS PARTS FB4404 RBLN-0059CEZZY J Balun, BLN-0059CE P1701 QPLGN0447FJZZY J Plug, 3Pin FB4405 RBLN-0059CEZZY J Balun, BLN-0059CE...
  • Page 47 LC-20M4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKB037DE3D SWITCH PWB UNIT(Continued) RMC4001 RRMCU0239CEZZ J R/C Receiver PSLDM4647CEFW J R/C Shield QEARZ0043CEZZ J Grounding Part...

  • Page 48: Cabinet Parts List

    LHLDW1173CEZZ J Wire Holder, x7 GCOVA1884CEZZ J R/C Receptor Cover PRDAR1552CEFW J Heat Dissipation Plate, x2 AH GDORF2062CEKA J Front Door PZETK0065CEZZ J Insulating Plate HBDGB3157PESA J SHARP Badge HiNDP5463CESB J Indication Plate PZETK0094CEZZ J Insulating Plate in Door (Switch Side)

  • Page 49: Cabinet And Mechanical Parts

    LC-20M4U LC-20M4U CABINET AND MECHANICAL PARTS 2-11 2-21 2-22 2-21 2-12 2-26 1-26 2-10 2-12 1-18 2-14 2-17 1-24 1-15 1-20 2-20 2-25 1-24 1-16 2-21 2-24 1-24 1-17 1-21 1-12 2-21 1-23 1-12 1-21 1-12 2-21 1-17 2-15 1-24...

  • Page 50: Packing Of The Set

    LC-20M4U PACKING OF THE SET Ref. No. Part No. Description Code Ref. No. Part No. Description Code å AC Adapter (UADP-0220CEZZ) å AC Cord (QACCD3088CEZZ) Polyethylene Bag Remote Control (SSAKA0160CEZZ) (RRMCG1459CESA) Wire Holder, x2 (LHLDW1028GEZZ) Operation Manual (TiNS-7530CEZZ) Batteries Dust Protection Cover...
  • Page 51 LC-20M4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code...
  • Page 52 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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