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Sharp LC-20S4E Service Manual

Lcd colour television
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See also: Operating Manual
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 ..................................................................................................................21
» BLOCK DIAGRAM ......................................................................................................................................26
» OVERALL WIRING DIAGRAM ...................................................................................................................28
» DESCRIPTION OF SCHEMATIC DIAGRAM ............................................................................................. 30
ËINVERTER Unit .......................................................................................................................................31
ËSUB Unit ..................................................................................................................................................32
ËMAIN Unit .................................................................................................................................................36
ËOPERATION Unit .....................................................................................................................................44
ËR/C, LED Unit ..........................................................................................................................................45
» PRINTED WIRING BOARD ASSEMBLIES ................................................................................................46
» REPLACEMENT PARTS LIST....................................................................................................................61
» PACKING OF THE SET ..............................................................................................................................73
SERVICE MANUAL
LCD COLOUR TELEVISION
MODEL
CONTENTS
SHARP CORPORATION
S85M5LC20S4E/
LC-20S4E
LC-20S4E
Page

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Summary of Contents for Sharp LC-20S4E

  • Page 1: Table Of Contents

    LC-20S4E SERVICE MANUAL S85M5LC20S4E/ LCD COLOUR TELEVISION LC-20S4E 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-20S4E 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: • Connect the resistor connection to all exposed metal WARNING parts having a return to the chassis (antenna, metal 1.
  • Page 3 LC-20S4E Precautions for using lead-free solder 1 Employing lead-free solder "AII 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

    0°C to +40°C (+32°F to +104°F) 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 production units. There may be...

  • Page 5: Operation Manual

    LC-20S4E OPERATION MANUAL...
  • Page 6 LC-20S4E...

  • Page 7: Dimensions

    LC-20S4E DIMENSIONS Unit: mm 138.9 482.8 53.4 97.6 403.1...

  • Page 8: Removing Of Major Parts

    LC-20S4E REMOVING OF MAJOR PARTS 1. Remove the stand cover fixing screw (1 pc.). 2. Remove the stand fixing screws (4 pcs.). 3. Remove the carrying handle fixing screws (4 pcs). 4. Remove the terminal cover. 5. Remove the cabinet B fixing screws (10 pcs.).
  • Page 9 LC-20S4E 8. Remove the 2 lock screws from the main PWB and undo the hooks a. Detach the main PWB, together with its terminals, from the chassis frame. 9. Remove the 4 lock screws from the sub PWB and undo the hooks b, c, d and e. Detach the sub PWB together with its terminals, from the chassis frame.
  • Page 10 LC-20S4E » 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-20S4E » Precautions at the time of the side-B(back) service of main, sub and Inverter unit. 1. Remove only SC1201 of the FPC for connection between Main unit (SC1201) and LCD panel (CN1), and connect the extended cable (QCNW-C458WJQZ) for service.

  • Page 12: Adjusting Procedure Of Each Section

    LC-20S4E 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. Preparation for adjustments Use a stable AC power source. LC-20S4E AC Power : 230V 1.
  • Page 13 LC-20S4E 5. Adjustment 5-1. RF AGC adjustment 1) Feed in the colour bar signal (Field strength: 52dBµ V) 2) In Adjustment Mode, select RF AGC AUTO ("OFF") and press the "RIGHT" cursor key to start the adjustment. 3) Automatic adjustment complete, when it displayed "OK".
  • Page 14 LC-20S4E 6. Factory Setting 6-1. Make the factory setting using the adjustment remote control. Model Key Name Remote Control Code OSD Language Setting A3IK0S4E0 Shipment Setting 1 1000 0011 1111 German (00001 FEh) A3IK0S4K0 Shipment Setting 2 1000 0000 1010...

  • Page 15: Hotel Mode

    LC-20S4E 8. Hotel mode 8-1. How to enter the Hotel mode. 1) Turn on the power and enter the Adjustment Process mode. 2) Using the "up" or "down" cursor key on the remote controller, select the Hotel mode. 3) Using the "right" cursor key on the remote controller, change the setting from "0" to "1". Now the Hotel mode shows up.
  • Page 16 LC-20S4E 10) Input mode fixed (Variable ↔ Fixed) If "Fixed" has been selected, any channels and input modes other than those selected in the start mode cannot be picked up. 8-3. Canceling the Hotel mode 1) Turn on the power and enter the Adjustment Process mode.
  • Page 17 LC-20S4E 4) First click [SST / ATMEL] and then follow by [Identify] to identify the flash memory. Confirm the item below in Comment Window. 5) Click [Select Intel HEX File …] to open the source files. The source file name are "Sedna_Release_****.hex"...
  • Page 18 LC-20S4E 9) Finally click [Restart System] to initialize. Confirm "Reset done" in Comment Window. 10) Power OFF the set by unplugging AC Cord, remove the JIG from the plug and wait for 1 minute before power ON again. Notes: If any error occur during any process, power OFF the set and repeat the all the process again. If these still fail, please erase Main Software and repeat the whole process again.
  • Page 19 LC-20S4E 4) First click [Enter ISP Mode] then click [Send]. If the following window appear, click [Yes] Confirm ISP status "Ready". If "Entering ISP is not successful" occur, repeat step No. 4) again. If still fail, unplug the AC cord and repeat from step No.
  • Page 20 LC-20S4E 6) Next click [Write Flash] and load the source file by clicking [Browse]. The source file name are "LC20S4E_****.hex". Once the data is loaded successfully click [Send]. Confirm the Program, PK26 & Character are all "OK" and ISP status is "Ready".

  • Page 21: Trouble Shooting Table

    LC-20S4E TROUBLE SHOOTING TABLE...
  • Page 22 LC-20S4E TROUBLE SHOOTING TABLE (Continued)
  • Page 23 LC-20S4E TROUBLE SHOOTING TABLE (Continued)
  • Page 24 LC-20S4E TROUBLE SHOOTING TABLE (Continued)
  • Page 25 LC-20S4E TROUBLE SHOOTING TABLE (Continued)

  • Page 26: Block Diagram

    LC-20S4E BLOCK DIAGRAM SP_L/R (-) R_IN / L_IN ANTENNA TUNER TU201 SF201 AUDIO POWER AMP SPEAKER P3301 SP_L/R (+) IC3301 PC 9V SC3901 SF202 SCART SP Vcc SC3901 (AV1) Y/U/V HEADPHONE J4000 JACK IC801 SC_ RIN / SC_LIN Y/U/V IN...

  • Page 27: Overall Wiring Diagram

    LC-20S4E OVERALL WIRING DIAGRAM LCD SOURCE QPWBMD346WJPZ (QCNW-D886WJQZ) P6700 NA391WJ SC105 N0596RE SC4201 N0596RE 3.3Vstb 3.3Vstb POWER POWER DUNTKD287WE KEY1 KEY1 KEY2 KEY2 ( QPWBFD287WJ) P6701 NA391WJ INVERTER BACK LIGHT P6702 NA391WJ DUNTKD282WE01 ( QPWBFD282WJ) MAIN DUNTKD290WE02 ( QPWBXD290WJN2 )

  • Page 28: Description Of Schematic Diagram

    LC-20S4E DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: 1. The voltages at test points are measured on the stable supply voltage of AC 220-240V. Signals are fed by a colour bar signal generator for servicing purpose and the above voltages are measured with a 20k ohm/V tester.

  • Page 29: Schematic Diagram Ëinverter Unit

    LC-20S4E SCHEMATIC DIAGRAM Ë INVERTER Unit...

  • Page 30: Ësub Unit

    LC-20S4E Ë SUB Unit-1/2...
  • Page 31 LC-20S4E Ë SUB Unit-2/2...

  • Page 32: Ëmain Unit

    LC-20S4E Ë MAIN Unit-1/4...
  • Page 33 LC-20S4E Ë MAIN Unit-2/4...
  • Page 34 LC-20S4E Ë MAIN Unit-3/4...
  • Page 35 LC-20S4E Ë MAIN Unit-4/4...

  • Page 36: Ëoperation Unit

    LC-20S4E Ë OPERATION Unit...

  • Page 37: Ër/C, Led Unit

    LC-20S4E Ë R/C, LED Unit...
  • Page 38 LC-20S4E PRINTED WIRING BOARD ASSEMBLIES KD290 D751 C766 L751 C2201 R753 SC1201 SC105 Q702 IC2202 IC1201 R1109 R1108 R1107 R1106 Q1108 C1214 TP102 Q1107 IC704 Q1106 C722 Q1105 Q1103 R1205 Q1102 R1206 C1130 L2202 C704 R2207 R2205 R1113 R2203 IC701...
  • Page 39 LC-20S4E D751 C1122 C1118 C1114 C1110 SC1201 C1123 C1119 C1115 C1111 R753 C1126 C1124 C1120 C1116 C1112 C1127 C1125 C1121 C1117 C1113 R1110 R1109 R1108 R1107 R1106 R708 R728 C1210 C1254 R1242 C1214 R1119 R1260 IC1101 Q1107 C1262 R1261 TP102...
  • Page 40 LC-20S4E SC105 R110 R716 R1251 R1209 Q106 C1255 R1208 R1117 R1253 R1216 R1252 R1132 R1254 R1114 R1203 R1131 R1201 R707 C1109 C1259 R1202 R1111 C1260 C1129 R1230 R1104 R1240 R1103 R714 D703 R715 R133 R132 R134 R131 D701 FB803 C711...
  • Page 41 LC-20S4E R110 FB1252 Q106 R2233 R716 R1251 R1209 C1256 C1255 R1208 R2224 R1117 R1253 R2225 C1131 R1216 R1252 R2226 R1114 C1257 R1254 R1132 R2228 R1255 R1131 R1201 R1203 R2227 C1259 R1263 R1202 R1204 R1256 R707 R1111 C1109 R1105 R1229 C1129...
  • Page 42 LC-20S4E QPWBFD289WJN1 DUNTKD289WE (QKITPD289WJN1) D7731 C7735 D7721 D7732 R7740 C7746 C7749 R7742 C7733 R7729 IC7705 Q7719 R7765 D7723 C7742 C7737 Q7704 C7729 R7730 HM7713 D7704 HM7714 C7721 L7707 C7727 R7722 SUB Unit (Wiring Side) FB7702 R7766 C7725 D3914 R7723 C7717...
  • Page 43 LC-20S4E R7738 Q3600 Q7703 Q7707 Q3601 Q7713 R7726 Q7718 Q7710 Q7712 R7759 Q7702 Q7706 Q7714 R7728 R7764 Q7715 SUB Unit (Chip Parts Side) R3935 R3937 R3936 C3909 C3914 Q3908 R3931 R3930 R3943 Q3909 C7730 R3938 R3322 C3917 R3924 R3907 Q3305...
  • Page 44 LC-20S4E H.V.CAUTION P6701 P6700 H.V.CAUTION H.V.CAUTION P6703 P6702 P6705 HM6704 HM6701 HM6720 HM6717 HM6716 HM6713 HM6712 HM6709 HM6708 HM6705 C6705 C6700 C6717 C6724 C6712 HM6703 HM6719 HM6718 HM6715 HM6714 HM6711 HM6710 HM6702 HM6707 HM6706 R6728 R6738 T6700 T6704 T6703 T6702...
  • Page 45 LC-20S4E POWER (QKITPD289WJN1) S4201 VOL - VOL + CH DOWN CH UP MENU INPUT SW4202 SW4207 SW4206 SW4205 SW4204 SW4203 DUNTKD287WE QPWBFD287WJN1 SC4201 (QKITPD289WJN1) OPERATION Unit (Wiring Side) R4202 R4204 R4201 R4203 OPERATION Unit (Chip Parts Side) J4000 XD288WJN2 Q4001...

  • Page 46: Printed Wiring Board Assemblies

    LC-20S4E Ref. No. Part No. Description Code Ref. No. Part No. Description Code PARTS LIST D6702 VHDMA157A//-1Y J Diode D6703 VHDMA157A//-1Y J Diode PARTS REPLACEMENT D6704 VHDDAN202K/-1Y J Diode D6705 VHDDAN202K/-1Y J Diode D6707 VHDMA157A//-1Y J Diode Replacement parts which have these special safety characteristics...

  • Page 47: Operation Unit

    LC-20S4E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKC282FM01 DUNTD287WE01 INVERTER UNIT (Continued) OPERATION UNIT RESISTORS R6718 VRD-RA2EE182JY J 1.8k 1/4W Carbon R4201 VRS-CY1JF122JY J 1.2k 1/16W Metal Oxide R6719 VRS-TW2ED122JY J 1.2k 1/4W Metal Oxide...

  • Page 48: Sub Unit

    LC-20S4E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD288WE02 DUNTKD289WE01 R/C, LED UNIT SUB UNIT INTEGRATED CIRCUITS INTEGRATED CIRCUITS IC4000 VHiMM1616++-1Y J MM1616XBRE IC3301 VHiAN17821A-1 J AN17821A IC7701 VHiSTRW67652E J STR-W6765N TRANSISTORS å IC7702 RH-FXA003WJZZ...
  • Page 49 LC-20S4E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD289WE01 C7703 RC-EZA556WJZZ J 150 400V Electrolytic C7704 RC-FZA180WJZZ J 0.1 580V Ceramic SUB UNIT (Continued) C7705 RC-KZA305WJZZ R 560p Ceramic C7706 RC-KZ0105GEZZ J 2200p 250V Ceramic å...
  • Page 50 LC-20S4E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD289WE01 R7762 VRS-CY1JF151FY J 150 1/16W Metal Oxide R7763 VRS-CY1JF472FY J 4.7k 1/16W Metal Oxide SUB UNIT (Continued) R7764 VRS-CY1JF223JY J 22k 1/16W Metal Oxide R7765 VRD-RA2EE222JY J 2.2k 1/4W...

  • Page 51: Main Unit

    LC-20S4E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD290WE02 C110 VCKYCY1CF224ZY J 0.22 16V Ceramic C111 VCEASX0JN227MY J 220 6.3V Electrolytic MAIN UNIT C113 VCKYCY1CF224ZY J 0.22 16V Ceramic C116 VCKYCY1CF224ZY J 0.22 16V Ceramic...
  • Page 52 LC-20S4E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD290WE02 C826 VCEASX0JN226MY J 22 6.3V Electrolytic C827 RC-KZA101WJZZY J 10 6.3V Ceramic MAIN UNIT (Continued) C828 RC-KZA101WJZZY J 10 6.3V Ceramic C829 RC-KZA101WJZZY J 10 6.3V Ceramic...
  • Page 53 LC-20S4E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD290WE02 R570 VRS-CY1JF100JY J 10 1/16W Metal Oxide R571 VRS-CY1JF470JY J 47 1/16W Metal Oxide MAIN UNIT (Continued) R573 VRS-CY1JF100JY J 10 1/16W Metal Oxide R574 VRS-CY1JF470JY...
  • Page 54 LC-20S4E Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKD290WE02 FB806 RBLN-0062TAZZY J Ferrite Bead FB807 RBLN-0062TAZZY J Ferrite Bead MAIN UNIT (Continued) FB808 RBLN-0062TAZZY J Ferrite Bead FB809 RBLN-0062TAZZY J Ferrite Bead FB1251 RBLN-0062TAZZY J Ferrite Bead...

  • Page 55: Cabinet And Mechanical Parts

    LC-20S4E Ref. No. Part No. Description Code Ref. No. Part No. Description Code XBBS940P08000 J Screw, x1 CABINET AND MECHANICAL PARTS XBBS940P25000 J Screw, x4 XEBS940P20000 J Screw, x8 XEBSN30P08000 J Screw, x7 XHBS830P14000 S Screw, x1 CCABAB035WJ01 S Cabinet A Ass’y...
  • Page 56 LC-20S4E CABINET AND MECHANICAL PARTS R/C, LED PWB 4-10 4-11 2-13 4-10 Inverter PWB 2-11 2-12 Sub PWB 2-10 Operation 2-14 Main PWB...

  • Page 57: Packing Parts

    PACKING PARTS SUPPLIED ACCESSORIES (NOT REPLACEMENT ITEM) LHLDWA002WJSA J Cable Clamp, x2 SPAKCC057WJZZ – Packing Case — å QACCBA016WJPZ J AC Cord (LC-20S4E(K)) SPAKPA532WJZZ – Wrapping Paper — å QACCKA006WJPZ J AC Cord (LC-20S4E/E(F)/ SPAKXA799WJZZ – Buffer Material — E(I)/E(R)) SPAKXA906WJZZ –...

  • Page 58: Packing Of The Set

    LC-20S4E PACKING OF THE SET Only for LC-20S4E/E(F) X4, X7 X1, S6 Only for LC-20S4E Only for LC-20S4E(R)
  • Page 59 LC-20S4E 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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