Sharp LC-20B2H Service Manual
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Sharp LC-20B2H Service Manual

Sharp LC-20B2H Service Manual

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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.
PRECAUTION ................................................... 2
» SPECIFICATIONS ............................................. 3
» OPERATION MANUAL ...................................... 4
» DIMENSIONS .................................................... 5
» REMOVING OF MAJOR PARTS ....................... 6
EACH SECTION ................................................ 9
» TROUBLE SHOOTING TABLE ....................... 13
» CHASSIS LAYOUT .......................................... 16
» BLOCK DIAGRAM ........................................... 18
Ë MAIN UNIT ................................................ 22
Ë TERMINAL UNIT ....................................... 30
Ë JACK UNIT ................................................ 34
SERVICE MANUAL
LCD COLOUR TELEVISION
MODELS
CONTENTS
Page
SHARP CORPORATION
1
LC-20B2H
LC-20B2M
Ë ELECTRICAL PARTS ................................ 41
Ë INVERTER-A UNIT .................................... 41
Ë INVERTER-B UNIT .................................... 41
Ë MAIN UNIT ................................................ 41
Ë TERMINAL UNIT ....................................... 44
Ë OPERATION UNIT .................................... 47
Ë JACK UNIT ................................................ 47
Ë R/C RECEIVER UNIT ................................ 47
Ë CABINET PARTS LIST ........................ 47, 50
Ë CABINET AND MECHANICAL PARTS ..... 48
Ë ACCESSORIES PARTS ............................ 50
Ë PACKING PARTS ...................................... 50
» PACKING OF THE SET ................................... 51
LC-20B2H
LC-20B2M
S01B5LC-20B2H
Page

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Summary of Contents for Sharp LC-20B2H

  • Page 1: Table Of Contents

    LC-20B2H LC-20B2M SERVICE MANUAL S01B5LC-20B2H LCD COLOUR TELEVISION LC-20B2H LC-20B2M 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-20B2H LC-20B2M 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-20B2H LC-20B2M Specifications ITEMS ............20" LCD COLOUR TV, Model: LC-20B2H/M LCD panel ....................19.7" TFT LCD Number of dots ................. 921,600 dots VGA Video colour systems............... World multi system TV Function TV Standard (CCIR) ................. I/DK/M/BG TV Turning System ..............Auto preset turning STEREO/BILINGUAL .............

  • Page 4: Operation Manual

    LC-20B2H LC-20B2M Operation Manual...

  • Page 5: Dimensions

    LC-20B2H LC-20B2M Dimensions MENU TV/VIDEO MAIN POWER 403.28 401.3 POWER SLEEP 95.2 60.5 ANT. VIDEO VIDEO AV-IN 1 VIDEO AUDIO AUDIO AV-IN 2/OUT AUDIO S-VIDEO S-VIDEO COMPONENT AUDIO HEAD PHONE POWER INPUT DC13V 12.5 163.9 65.5 229.4 (Unit: mm)

  • Page 6: Removing Of Major Parts

    LC-20B2H LC-20B2M REMOVING OF MAJOR PARTS 1. Remove the back cover. 2. Remove the table stand fixing screws (4 pcs.). 3. Remove the cabinet B fixing screws (15 pcs.) and detach the cabinet. : XBBSF30P06000, : XEBSF40P16000) 4. Remove the reinforcement angle fixing screws (4 pcs.).
  • Page 7 LC-20B2H LC-20B2M 7. Remove the terminal PWB fixing screws (4 pcs.). 8. Remove the jack PWB fixing screws (2 pcs.). 9. Remove the main PWB fixing screws (3 pcs.). 10. Remove the inverter-A PWB fixing screws (2 pcs.). 11. Remove the inverter-B PWB fixing screws (2 pcs.).
  • Page 8 LC-20B2H LC-20B2M » 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 106 for Model LC-20B2H/M.
  • Page 10 LC-20B2H LC-20B2M 5-3. TAMP adjustment 1) Feed the color 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-20B2H LC-20B2M [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-20B2H LC-20B2M • Setting screen of “PUBLIC MODE” PUBLIC MODE MAXIMUM VOLUME 1()2() • ()59()60 VOLUME FIXED [VARIABLE VA RIABLE()FIXED REMOTE CONTROL [RESPOND RESPOND()LI MITED USER CONTROL [RESPOND RESPOND()NO RESPOND ON SCREEN DISPLAY [YES YES()NO AV1 INPUT [NORMAL NORMAL ()START()AV 1 FIXED...

  • Page 13: Trouble Shooting Table

    LC-20B2H LC-20B2M TROUBLE SHOOTING TABLE...
  • Page 14 LC-20B2H LC-20B2M TROUBLE SHOOTING TABLE (Continued)
  • Page 15 LC-20B2H LC-20B2M TROUBLE SHOOTING TABLE (Continued)

  • Page 16: Chassis Layout

    LC-20B2H LC-20B2M CHASSIS LAYOUT MAIN Unit (Side A) MAIN Unit (Side B)
  • Page 17 LC-20B2H LC-20B2M R/C RECEIVER Unit INVERTER-A Unit JACK Unit OPERATION Unit INVERTER-B Unit TERMINAL Unit...

  • Page 18: Block Diagram

    LC-20B2H LC-20B2H LC-20B2M LC-20B2M BLOCK DIAGRAM TERMINAL UNIT VI DEO1 UNIT INVERTER-A UNIT INVERTER-B UNIT L1, R1 AV 1 TV-V TUNER S-VIDEO INVERTER INVERTER SY, SC LAMPS LAMPS INPUT T6751, T6752, T6551, T6552, TU3201 T6753, Q6751, T6553, Q6551, V2/VO Q6752, Q6755...

  • Page 19: Description Of Schematic Diagram

    LC-20B2H LC-20B2M 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 20: Schematic Diagramë Operation And R/C Receiver Unit

    LC-20B2H LC-20B2M SCHEMATIC DIAGRAM Ë OPERATION and R/C RECEIVER Unit OPERATION Unit R/C RECEIVER Unit...

  • Page 21: Ë Main Unit

    LC-20B2H LC-20B2H LC-20B2M LC-20B2M Ë MAIN Unit-1/4...
  • Page 22 LC-20B2H LC-20B2H LC-20B2M LC-20B2M Ë MAIN Unit-2/4...
  • Page 23 LC-20B2H LC-20B2H LC-20B2M LC-20B2M Ë MAIN Unit-3/4...
  • Page 24 LC-20B2H LC-20B2H LC-20B2M LC-20B2M Ë MAIN Unit-4/4...

  • Page 25: Ë Terminal Unit

    LC-20B2H LC-20B2H LC-20B2M LC-20B2M Ë TERMINAL Unit-1/2...
  • Page 26 LC-20B2H LC-20B2H LC-20B2M LC-20B2M Ë TERMINAL Unit-2/2...

  • Page 27: Ë Jack Unit

    LC-20B2H LC-20B2M Ë JACK Unit...

  • Page 28: Ë Inverter-A And Inverter-B Unit

    LC-20B2H LC-20B2M Ë INVERTER-A and INVERTER-B Unit INVERTER-A Unit INVERTER-B Unit...

  • Page 29: Printed Wiring Board Assemblies

    LC-20B2H LC-20B2M PRINTED WIRING BOARD ASSEMBLIES R/C Receiver Unit (Component Side) Operation Unit (Component Side) Jack Unit (Component Side)
  • Page 30 LC-20B2H LC-20B2M Inverter-A Unit (Component Side) Inverter-B Unit (Component Side)
  • Page 31 LC-20B2H LC-20B2M Main Unit (Side-A)
  • Page 32 LC-20B2H LC-20B2M Main Unit (Side-B)
  • Page 33 LC-20B2H LC-20B2M Terminal Unit (Component Side)

  • Page 34: Parts List

    LC-20B2H LC-20B2M Ref. No. Part No. PARTS LIST Description Code Ref. No. Part No. Description Code C6760 VCKYCY1CB333K J 0.033 16V Ceramic PARTS REPLACEMENT C6761 VCEAPW1CN477M J 470 16V Electrolytic C6762 VCEAPW1CN477M J 470 16V Electrolytic Replacement parts which have these special safety character-...
  • Page 35 LC-20B2H LC-20B2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA562FE06 C409 VCKYTV1AB105K 10V Ceramic C410 VCKYCY1EF104Z J 0.1 25V Ceramic MAIN UNIT (Continued) C411 VCKYTV1AB105K 10V Ceramic C412 VCCCCY1HH331J J 330p 50V Ceramic IC701 VHiAN8005M/-1...
  • Page 36 LC-20B2H LC-20B2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA562FE06 R834 VRS-CY1JF102J J 1k 1/16W Metal Oxide AA R836 VRS-CY1JF000J J 00 1/16W Metal Oxide AA MAIN UNIT (Continued) R838 VRS-CY1JF000J J 00 1/16W Metal Oxide AA...
  • Page 37 LC-20B2H LC-20B2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTKA562FE06 Q3503 VS2SC3928AR-1 J 2SC3928AR Q3504 VS2SC3928AR-1 J 2SC3928AR MAIN UNIT(Continued) Q3505 VSDTC144EE/-1 J DTC144EE Q3510 VSDTC314TK/-1 J DTC314TK R2003 VRS-CA1JF223J J 22k 1/16W Metal Oxide AA...
  • Page 38 LC-20B2H LC-20B2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code C3604 VCKYTQ1EF105Z 25V Ceramic DUNTKB005DE01 C3605 VCKYTQ1EF105Z 25V Ceramic TERMINAL UNIT(Continued) C3700 VCKYCY1EF104Z J 0.1 25V Ceramic C3701 VCEAPF1EW475M J 4.7 25V Electrolytic C3328 VCEAPF1HN225M J 2.2...
  • Page 39 LC-20B2H LC-20B2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code R3707 VRS-CY1JF105J J 1M 1/16W Metal Oxide AA DUNTKB005DE01 R3708 VRS-CY1JF682J J 6.8k 1/16W Metal Oxide AA TERMINAL UNIT(Continued) R3710 VRS-CY1JF273F J 27k 1/16W Metal Oxide AA...
  • Page 40 LC-20B2H LC-20B2M Ref. No. Part No. Description Code Ref. No. Part No. Description Code MISCELLANEOUS PARTS DUNTKB005DE01 P4005 QPLGN0564TAZZ J Plug, 5pin TERMINAL UNIT(Continued) RMC4002 RRMCU0239CEZZ J Remote Receiver P3601 QPLGN0378GEZZ J Plug, 3pin P3602 QPLGN0378GEZZ J Plug, 3pin P3701...
  • Page 41 LC-20B2H LC-20B2M CABINET AND MECHANICAL PARTS OPERATION Unit 1-12 1-11 INVERTER-A 1-12 Unit 1-10 INVERTER-B MAIN Unit 1-11 Unit JACK Unit R/C RECEIVER Unit TERMINAL Unit...
  • Page 42 LC-20B2H LC-20B2M 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 43: Ë Packing Parts

    J Serial No. Label (LC-20B2H) PACKING PARTS TLABN0396CEZZ J Serial No. Label (NOT REPLACEMENT ITEM) (LC-20B2M) TLABN0398CEZZ J Serial No. Label SPAKC5617CEZZ - Packing Case (LC-20B2H) — (LC-20B2M(X)) SPAKC5662CEZZ - Packing Case — (LC-20B2M/M(X)) SPAKH0150CEZZ - Protection Sheet — SPAKP0912CEZZ - Wrapping Paper —...

  • Page 44: Packing Of The Set

    LC-20B2H LC-20B2M PACKING OF THE SET Operation Manual Cable Clamp (2 pcs.) Dry Battery (2 pcs.) AC Adapter AC Cord Antenna Cable Wireless Remote Control Buffer Material (Top) Polyethylene Bag Buffer Material (Bottom) No. Label Packing Case Not Replacement Item...
  • Page 45 LC-20B2H LC-20B2M COPYRIGHT C 2001 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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