Sharp LC-20SH4U Service Manual

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Service manual (54 pages)

Operation manual (39 pages)

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Page 1: Table Of Contents
LC-20SH4U SERVICE MANUAL S25E5LC20SH4U LCD COLOR TELEVISION LC-20SH4U 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-20SH4U 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 LC-20SH4U 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. AVERTISSEMENT conduite électrique ou une prise de terre branchée à la terre.
Page 4 LC-20SH4U 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 5: Specifications
15.2 lbs. (6.9 kg), w/o accessories ËAs a part of policy of continuous improvement, SHARP reserves the right to make design and specification changes for product improve- ment without prior notice. The performance specification figures indicated are nominal values of production units. There may be some...
Page 6: Operation Manual
LC-20SH4U OPERATION MANUAL...
Page 7 LC-20SH4U...
Page 8: Dimensions
LC-20SH4U DIMENSIONS Unit:mm ( 45 ) ( 89.8 ) ( 403.3 ) ( 129 ) ( 436 ) ( 199.2 ) ( 620 ) ( 100 )
Page 9: Removing Of Major Parts
LC-20SH4U REMOVING OF MAJOR PARTS 1. Remove the stand cover fixing screws (1 pcs.). 2. Remove the stand fixing screws (4 pcs.). 3. Remove the cabinet B fixing screws (13pcs.). 4. Remove the cabinet B after opening from the direction of an arrow.
Page 10 LC-20SH4U 6. Remove the 2 lock screws from the main PWB and undo the hooks a. Detach the chassis frame, together with its terminals, from the main PWB. 7. Remove the 2 lock screws from the sub PWB and undo the hooks b, c and d. Detach the chassis frame together with its terminals, from the sub PWB.
Page 11 LC-20SH4U » 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 12 LC-20SH4U » Precautions at the time of the side B(back) service of main, sub and Inverter unit. 1. Remove the FFC for connection between Main unit (SC1001) and LCD panel (CN1), and connect the extended cable (QCNW-B784WJZZ) for service. 2. Remove the FFC for connection between Main unit (SC1000) and LCD panel (CN2), and connect the extended cable (QCNW-A556WJZZ) for service.
Page 13: Adjusting Procedure Of Each Section
LC-20SH4U ADJUSTING PROCEDURE OF EACH SECTION The best adjustment is made before shipping. If any position deviation is found or after part replacement is performed, adjust as follows. 1. Preparations (1) Plug the AC power cord directly into a wall outlet.
Page 14 LC-20SH4U [4] Initialization 4-1. Ground pins (81) and (82) of IC2001 (microprocessor) and turn on the power. 4-2. Make sure the screen size is set at 20 inches. 4-3. Make sure the model number is A627A. (Adjustment Process Menu Page 1) 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 5-1.
Page 15 LC-20SH4U 6-3. White balance adjustment 1) Adjustment procedure Adjust the RGB CUTOFF2 setting for white 40% first and then the RGB-GAIN setting for white 80%. (1) Adjusting the test signal [Input signal] Feed the DVP built-in signal: White 80% (191 gradations) for the left of screen, and white 40% (92 gradations) for the right.
Page 16 LC-20SH4U 7-2. Description of Factory Settings. Setting content/range Initial Value (AV1) (AV2) (COMPONENT1) MENU PICTURE AV MODE STANDARD/DYNAMIC/DYNAMIC(FIXED)/MOVIE/GAME DYNAMIC DYNAMIC DYNAMIC DYNAMIC ON/OFF BACKLIGHT BRIGHT/NORMAL/DARK/VARIABLE VARIABLE (STANDARD) (DYNAMIC) (DYNAMIC(FIXED) (MOVIE) (GAME) 1 (DARK) ~9 (NORMAL)~17 (BRIGHT) CONTRAST 0~60 BRIGHTNESS -30~+30...
Page 17 LC-20SH4U LIST OF THE ADJUSTMENT PROCESS MODE MENU " For calling the adjustment process mode and keying in this mode, refer back to ADJUSTING PROCEDURE OF " EACH SECTION ADJUSTMENT PROCESS 1st LEVEL ITEM DEFAULT TABLE Initial Response precautions on servicing Page No.
Page 18 TINT SETTING (COMPOSITE, S VIDEO) NOT USED N358 TV SHRAP V V PICTURE QUALITY SETTING (TV) NOT USED N358 AV SHARP V V PICTURE QUALITY SETTING (COMPOSITE, S VIDEO) NOT USED N358 TV SHRAP H1 H PICTURE QUALITY SETTING 1 (TV) NOT USED...
Page 19 COLOR DENSITY SETTING (COMPOSITE, S VIDEO) NOT USED N443 AV TINT TINT SETTING (COMPOSITE, S VIDEO) NOT USED N443 AV SHARP V V PICTURE QUALITY SETTING (COMPOSITE, S VIDEO) NOT USED N443 AV SHARP H1 H PICTURE QUALITY SETTING 1 (COMPOSITE, S VIDEO)
Page 20 PAL-N TV TINT TINT SETTING (TV) NOT USED PAL-N AV TINT TINT SETTING (COMPOSITE, S VIDEO) NOT USED PAL-N TV SHARP V V PICTURE QUALITY SETTING (TV) NOT USED PAL-N AV SHARP V V PICTURE QUALITY SETTING (COMPOSITE, S VIDEO) NOT USED...
Page 21 1125ICOLOR COLOR DENSITY SETTING (TV) NOT USED 1125I TINT TINT SETTING (TV) NOT USED 1125I SHARP V V PICTURE QUALITY SETTING (TV) NOT USED 1125I SHARP H1 H PICTURE QUALITY SETTING 1 (TV) NOT USED 1125I SHARP H2 H PICTURE QUALITY SETTING 2 (TV) NOT USED...
Page 22 LC-20SH4U EDS DATA SHOULD DISPLAYED AT THE BOTTOM Adjustment process auto clock display 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38...
Page 23 LC-20SH4U TEST PATTERN IN THE ADJUSTMENT PROCESS MODE IC1201 (LCD controller) test pattern 1) Getting the test pattern displayed Call the adjustment process mode, select "DVP" on page 4, and press the ENTER button. Next select "DVP TEST PATTERN" in line 2 on page 1. (The "DVP TEST PATTERN" turns yellow.) Now use the cursor RIGHT/ LEFT keys to get the test pattern displayed.
Page 24: Public Mode Setting Procedure
LC-20SH4U PUBLIC MODE SETTING PROCEDURE 1. How to start Public Mode » There are the following two ways to get the public mode setup screen displayed. 1 In the adjustment process mode, turn on "PUBLIC MODE". Also press the "CH (ù)" and "VOL (+)" keys on the set at once and turn on the power.
Page 25 LC-20SH4U 2. How to exit Public Mode There are the following ways to quit the public mode setup screen. » Turn off "PUBLIC MODE" in the adjustment process mode. ( ) ← This way alone is not for quitting the setup screen, but for quitting the mode itself.
Page 26 LC-20SH4U 5. On Setting Items * "EZ-SETUP" discussed below indicates "EZ-SETUP after the first power-on". (1) POWER ON FIXED " " " " Selection Selection between Variable Fixed (loop provided) Default – (Variable) " " Explanation Fixed setting, the power-off by the power key of the unit is invalidated and the image is kept being received.
Page 27 LC-20SH4U (4) VOLUME FIXED LEVEL Selection Adjustment from 1 to 60 (no loop) Default " " Explanation The sound volume to be fixed by Volume fixed is determined. Limit in Setting None Exception None " " " " Remarks Setting is valid only when...
Page 28 LC-20SH4U (8) ON SCREEN DISPLAY " " " " Selection Selection between Limited (loop provide) Default Explanation The following OSD displays are made ineffective. Displays of menu group, channel call, sound volume bar and direct key call " " Limit in Setting »...
Page 29 LC-20SH4U (10) INPUT MODE FIXED " " " " Selection Selection between Variable Fixed (loop provide) Default – (Variable) " " Explanation The input mode is fixed at the input source or the channel set at the Input mode start in 9 and other input sources and channels can be made non-selectable.
Page 30 LC-20SH4U Sound only mode function specifications 1 Behavior of the remote control BACKLIGHT button. BACKLIGHT [BRIGHT]→BACKLIGHT [NORMAL]→ BACKLIGHT [DARK]→BACKLIGHT [AUTO]→BACKLIGHT [OFF]→BACKLIGHT [BRIGHT] (The "OFF" setting is added while the remote control BACKLIGHT button is effective. With "YES" selected in "SOUND ONLY MODE".) 2 When the "OFF"...
Page 31 LC-20SH4U Table of Key Allocation in Sound Only Mode (Unit keys/Remote control keys) Allocation Unit keys POWER Released INPUT Temporary reset MENU Released Temporary reset Temporary reset Remote control POWER Released PIC.FLIP Released DISPLAY Temporary reset SLEEP Temporary reset MENU...
Page 32: Trouble Shooting Table
LC-20SH4U TROUBLE SHOOTING TABLE...
Page 33 LC-20SH4U TROUBLE SHOOTING TABLE (Continued)
Page 34 LC-20SH4U TROUBLE SHOOTING TABLE (Continued)
Page 35 LC-20SH4U TROUBLE SHOOTING TABLE (Continued)
Page 36: Major Ic Informations
LC-20SH4U MAJOR IC INFORMATIONS IC2003 (IXA627WJ) • Description of Pins Pin No. Pin Name Pin Name Function TB1in CSYNC Composite sync signal TB0in IREM1 Remote control signal BYTE BYTE Connected to GND CNVss CNVss Connected to GND (connected to Vcc1 for CNVSS at flash write)
Page 37 LC-20SH4U Pin No. Pin Name Pin Name Function HPMUTE Headphones mute SP MUTE1 Main speaker mute HP DET Headphones detect SSTBY Amplifier power control VSH IN Panel gate driver voltage confirm LMUTE Line out audio mute V IN/OUT Video input/output select...
Page 38: Block Diagram
LC-20SH4U BLOCK DIAGRAM SUB_PWB × IMZ1A To MAIN MICON VIDEO U/V TUNER S-IF SIF AMP I2C(3.3V) S-SW SY-IN SC-IN AUDIO-IN VIDEO-IN AUDIO-IN Y-IN Componen t Pb-IN Pr-IN SOUND_PROCESSO R RH-IXB302WJN1Q DACA_ OUT AUDIO_POWER_AMP HP (Front ) DACM _ OUT Jack 3.
Page 39 LC-20SH4U LCD_Panel MAIN_PWB RCRSCA097WJZZ 54MHz PANEL CVBS-in RED,GREEN,BLUE 13pin CVBS-in CK,SP 40pin Y-in 42pin DVP-ML T-CON C-in IXB150WJ (50,20,30FFC) 31pin POWER:VSH 3.3V D-Y-in VLS 5.0V 40pin VGH 23.0V IP/SCALER Cb-in D1~D4, OSD VGL -7.0 V 33pin Cr-in 21 pin V OUT...
Page 40: Overall Wiring Diagram
LC-20SH4U OVERALL WIRING DIAGRAM...
Page 41 LC-20SH4U...
Page 42: Description Of Schematic Diagram
LC-20SH4U DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: 1. The voltages at test points are measured on 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 43: Schematic Diagram
LC-20SH4U SCHEMATIC DIAGRAM Ë INVERTER Unit...
Page 44 LC-20SH4U Ë MAIN Unit-1/4...
Page 45 LC-20SH4U...
Page 46 LC-20SH4U Ë MAIN Unit-2/4...
Page 47 LC-20SH4U...
Page 48 LC-20SH4U Ë MAIN Unit-3/4...
Page 49 LC-20SH4U...
Page 50 LC-20SH4U Ë MAIN Unit-4/4...
Page 51 LC-20SH4U...
Page 52 LC-20SH4U Ë SUB Unit-1/4...
Page 53 LC-20SH4U...
Page 54 LC-20SH4U Ë SUB Unit-2/4...
Page 55 LC-20SH4U Note:SUB 3 does not use it.
Page 56 LC-20SH4U Ë SUB Unit-4/4...
Page 57 LC-20SH4U...
Page 58: Operation Unit
LC-20SH4U Ë OPERATION Unit...
Page 59 LC-20SH4U Ë R/C, LED Unit...
Page 60: Printed Wiring Board Assemblies
LC-20SH4U PRINTED WIRING BOARD ASSEMBLIES SC1002 SC1000 IC1004 L1000 IC1201 C1054 X1000 R2061 R2054 R2053 P2001 R2056 R2052 R2051 C1090 R2050 R2049 L1202 C1015 D1201 Q1201 R1202 TU1300 C1340 SC2001 C1341 C1339 LUG2001 MAIN Unit (Side-A)
Page 61 LC-20SH4U L1203 D1209 L1201 C1203 C1235 SC2003 R1226 Q1215 IC1201 C1218 X2001 C1217 R2005 R2016 C1222 R2015 C1216 R2017 C1223 L1303 QPWBXD034WJN1 KD034WE C1344 R1310 R1309 C1335 C1333 SC2002 C1301...
Page 62 LC-20SH4U SC1000 SC1002 L1000 C1009 C1074 IC1201 C1073 C1072 C1071 C1070 C1069 C1068 C1067 C1066 C1065 R1051 C1063 R1049 C1062 X1000 C1060 C1059 C1058 C1057 C1056 C1055 C1052 C1053 R1046 R1048 R2054 TL2053 TL2051 TL2052 R2053 C1090 R2056 R2052 R2051...
Page 63 LC-20SH4U C1203 L1201 R1203 R1238 C1238 D1204 C1228 R1244 C1232 R1243 Q1215 IC1201 IC1203 Q1216 LUG2002 C1218 X2001 C1221 C2010 R2004 C1217 R2002 R2008 R2007 C1222 C1224 R2005 R2016 R2015 R2068 C1216 TL2043 R2017 R1310 R1309 C1335 C1333 SC2002...
Page 64 LC-20SH4U Q1204 Q1205 C1210 C1201 R2011 R121 D1202 R1218 R1221 SC2003 R1216 R1252 C1231 C1214 R1224 C1206 R1251 R1214 R1208 IC2005 R1232 Q2001 Q1210 R1233 R1237 Q1213 D1206 R1230 Q1211 Q1208 R1234 C1220 Q1209 R2066 Q1207 R2067 R1227 C2007 Q1206...
Page 65 LC-20SH4U R1082 R1063 R1067 R1065 D1210 FB1007 R1064 R1066 R1068 R1062 R1018 R1069 R1030 R1070 IC1001 R1055 R1054 R1008 R1053 R1028 R1085 R2058 R1080 R1071 Q2003 C1025 R2048 R1072 R2006 R1073 R1074 R2057 C1000 IC1003 Q1001 C1002 C1004 IC1002 R1014...
Page 66 LC-20SH4U C1210 TL2032 R1213 R2011 C1201 R1209 Q1204 Q1205 TL2034 TL2030 R1210 R1218 R1220 R1222 C1207 R1221 TL2033 TL2031 C1214 D1203 R1252 R1224 C1231 R1251 C1206 R1214 R1208 R2047 R2058 R1232 TL1214 TL2040 TL1213 TL2041 TL1212 TL2047 TL1211 R1231 TL1210...
Page 67 LC-20SH4U TL1005 R1082 R1063 R1065 R1067 R1064 R1066 R1068 FB1007 D1203 Q1000 R1062 R1018 R1069 R1006 R1009 R1030 R1070 C1089 C1001 R1055 IC1001 R1054 R1078 R1077 Q1002 R1086 R1053 R1007 R1004 R1052 C1007 C1006 R1088 R1003 R1001 R2047 R1008 TL1000...
Page 68 LC-20SH4U...
Page 69 LC-20SH4U SUB Unit (Wiring Side)
Page 70 LC-20SH4U...
Page 71 LC-20SH4U SUB Unit (Chip Parts Side)
Page 72 LC-20SH4U INVERTER Unit (Wiring Side) INVERTER Unit (Chip Parts Side)
Page 73 LC-20SH4U...
Page 74 LC-20SH4U OPERATION Unit (Wiring Side) OPERATION Unit (Chip Parts Side) R/C, LED Unit (Wiring Side) R/C, LED Unit (Chip Parts Side)
Page 75: Replacement Parts List
2. NO. DE REF 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 location of SHARP Parts Distributor, Please call Toll-Free; Phone (416) 890-2100...
Page 76 LC-20SH4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD034FMF3 C1051 RC-KZA101WJZZY J 10 6.3V Ceramic C1052 VCKYCZ1AB333KY J 0.033 10V Ceramic MAIN Unit (Continued) C1053 VCKYCZ1AB333KY J 0.033 10V Ceramic C1054 VCEASY1CN477MY J 470 Electrolytic DIODES C1055 VCKYCZ1AB104KY J 0.1...
Page 77 LC-20SH4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD034FMF3 R1042 VRS-CY1JF000JY 1/16W Metal Oxide R1043 VRS-CY1JF223JY J 22k 1/16W Metal Oxide MAIN Unit (Continued) R1044 VRS-CY1JF103JY J 10k 1/16W Metal Oxide R1046 VRS-CJ1JF100JY J 10...
Page 78 LC-20SH4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD034FMF3 R2038 VRS-CY1JF101JY J 100 1/16W Metal Oxide R2039 VRS-CY1JF101JY J 100 1/16W Metal Oxide MAIN Unit (Continued) R2040 VRS-CY1JF103JY J 10k 1/16W Metal Oxide R2042 VRS-CY1JF101JY...
Page 79 LC-20SH4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD035WEF3 L7002 RCiLPA356WJZZ+ J Coil å L7003 RCiLPA356WJZZ+ J Coil SUB Unit L7004 RCiLPA476WJZZ+ J Coil L7701 RCiLFA145WJZZ J Coil INTEGRATED CIRCUITS L7702 RCiLFA145WJZZ J Coil L7732...
Page 80 LC-20SH4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD035WEF3 R7010 VRS-CY1JF103JY J 10k 1/16W Metal Oxide R7301 VRS-CY1JF104DY J 100k 1/16W Metal Oxide SUB Unit (Continued) R7302 VRS-CY1JF104DY J 100k 1/16W Metal Oxide R7303 VRS-CY1JF333JY...
Page 81 LC-20SH4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD035WEF3 DUNTKD036WEF3 SUB Unit (Continued) OPERATION Unit DIODES P3902 QCNCMA250WJZZ J Connector, 23-pin(MA) P7301 QCNCMA012WJZZ J Connector, 15-pin D4201 RH-EX0610GEZZY J Zener Diode, 4.7V SC3601 QSOCN0896REZZ J Socket, 6-pin D4202 RH-EX0610GEZZY J Zener Diode, 4.7V...
Page 82: Inverter Unit
LC-20SH4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD037WEF3 DUNTKD057FMF3 R/C, LED Unit INVERTER Unit TRANSISTORS TRANSISTORS Q6700 VS2SC5886A+-1Y J 2SC5886A Q4001 VSKRC104S//-1Y J KRC104S Q6701 VS2SC5886A+-1Y J 2SC5886A Q4002 VSKRC104S//-1Y J KRC104S Q6702 VS2SA1530AR-1Y...
Page 83 LC-20SH4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code HM6708 LX-GZ3002PEZZ J Screw DUNTKD057FMF3 HM6709 LX-GZ3002PEZZ J Screw INVERTER Unit (Continued) HM6710 LX-GZ3002PEZZ J Screw HM6711 LX-GZ3002PEZZ J Screw HM6712 LX-GZ3002PEZZ J Screw C6743 VCKYCY1CB333KY J 0.033 16V...
Page 84: Cabinet And Mechanical Parts
LC-20SH4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET AND MECHANICAL PARTS Not Available – Cabinet A Ass’y Unit — CCABAA833WJ01 J Cabinet A Ass’y Not Available 1-1-1 – Cabinet A — 1-1-2 HDECQA528WJSA J R/C, LED Cover...
Page 85 LC-20SH4U CABINET AND MECHANICAL PARTS Operation PWB 1-1-3 1-1-4 5-2-4 1-1-4 R/C, LED PWB 5-2-4 1-1-2 5-2-1 1-1-3 1-1-6 1-1-5 1-1-1 5-2-2 5-2-6 5-2-5 5-11 5-2-3 5-10 Inverter PWB Sub PWB Main PWB...
Page 86: Packing Parts
LC-20SH4U Ref. No. Part No. Description Code Ref. No. Part No. Description Code PACKING PARTS SUPPLIED ACCESORIES (NOT REPLACEMENT ITEM) QACCDA038WJPZ J AC Cord SPAKCB820WJZZ – Packing Case — å RRMCGA367WJSA J Wireless Remote Control SPAKPA478WJZZ – Wrapping Paper —...
Page 87: Packing Of The Set
LC-20SH4U PACKING OF THE SET X3, X4...
Page 88 LC-20SH4U COPYRIGHT © 2005 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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