Sharp LC-20SH21U Service Manual
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Sharp LC-20SH21U 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
1. Precautions and Safety Notices.........................................................2
2. Specifications.................................................................................5
3. Servicing Environment.....................................................................6
4. Disassembly of Major Parts...............................................................7
5. Wiring Diagram.............................................................................12
6. Block Diagram...............................................................................13
7. Alignment Procedure For White Balance.............................................14
8. Firmware Upgrade Procedure ..........................................................22
9. Troubleshooting Analysis.................................................................23
10. Exploded View..............................................................................27
11. Part List.........................................................................................29
SHARP CORPORATION
SERVICE MANUAL
LCD COLOR TELEVISION
MODEL
Contents
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
1
LC-20SH21U
LC-20SH21U
.
Page

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Summary of Contents for Sharp LC-20SH21U

  • Page 1: Table Of Contents

    LC-20SH21U SERVICE MANUAL LCD COLOR TELEVISION LC-20SH21U 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 Contents Page 1.

  • Page 2: Precautions And Safety Notices

    LC-20SH21U 1. Precautions and Safety Notices Prior to using this manual, please ensure that you have carefully followed all the procedures outlined in the user manual for this product. Read all of these instructions. Save this instructions for later use Follow all warnings and instructions marked on the product.
  • Page 3 LC-20SH21U Safety Guidelines CAUTION: The power supply outlet should be located near the HD TV and should be easily accessible. Always use the appropriate AC cord that is certified for your specific country. Some examples are listed below: USA....UL Switzerland ..SEV Canada.....CSA...
  • Page 4 If a BNC cable is used, use only a shielded BNC (5) cable. Also, any unauthorized changes or modifications not expressly approved by SHARP CORPORATION will void the user's authority to operate this device.

  • Page 5: Specifications

    The best TVs use the best technology: ATI inside your TV for The Ultimate Visual Video Engine Experience.™ Your new Sharp TV is powered by ATI’s Xilleon™ image processing chip for the true high definition cinematic experience. Enjoy your new Sharp TV with ATI inside. PC Compatible Recommended...

  • Page 6: Servicing Environment

    2. Service the LCD TV in a room with low humidity and free of dust. 3. Place the LCD TV on a firm, level surface. Subjecting the LCD TV to a drop or sharp impact may cause severe damage to thin glass, plastic surface materials, and internal components.

  • Page 7: Disassembly Of Major Parts

    LC-20SH21U 4. Disassembly of Major Parts 1. Remove the cover hinge. 2. Remove the stand fixing screws (5 pcs ). Remove the Cabinet fixing screws (7 pcs). 4. After opening the Cabinet, remove the cable tie first.
  • Page 8 LC-20SH21U 5. Disconnect the Panel FFC cable connector. Disconnect all the connectors from the PWB’s of Cabinet module.
  • Page 9 LC-20SH21U 7. Remove the Inverter PWB fixing screws (4 pcs). 8. Remove the Power PWB fixing screws (4 pcs). Remove the Shield can module fixing screws (6 pcs), then take out the shield can module. 10. Remove the Left side IO fixing screws (5 pcs).
  • Page 10 LC-20SH21U 12. Remove the Right side IO fixing screws (4 pcs). 13. Remove the Main PWB fixing screws (4 pcs). Disconnect all the connectors from the PWB’s of Bezel module.
  • Page 11 LC-20SH21U 15. Remove the Key PWB fixing screws (2 pcs). 16. Remove the Audio PWB fixing screws (1 pcs). 17. Remove the Speakers fixing screws (4 pcs).

  • Page 12: Wiring Diagram

    LC-20SH21U 5. Wiring Diagram KEY BD POWER BD AC socket 2pin 2pin AC 120V 60Hz CN901 6 PIN CN2 4pin AUO 20” WXGA INVERTER T200XW02 6 PIN wire 4 PIN wire CN301 6pin CN200 1 4pin LAMPS 8 PIN wire...

  • Page 13: Block Diagram

    LC-20SH21U 6. Block Diagram +3.3V +2.6V +3.3V +3.3V CN301 +3.3V KEYPAD IC501,IC502 IC503 IC405 Microcontroller CN303 IC407 MT46V32M16 M25P40 K9F2808U0C IR & LED IC301 DDR MEMORY EEPROM NAND FLASH RESET JTAG RESET CN302 ATmeg88 64MBYTES 4MBITS 128MBITS ATmeg48 PROGRAM DOENLOAD +2.6V...

  • Page 14: Alignment Procedure For White Balance

    LC-20SH21U 7. Alignment Procedure for White Balance If the Main board or LCD Panel is replaced, white balance alignment must be performed. The adjustment procedure should be done as following. Alignment equipment: 1. ASTRO VG859 series. 2. MINOLTA CA210 Please set the LCD TV to enter Factory mode first, then proceed to alignment procedure.
  • Page 15 LC-20SH21U 1.1.3 After the calibration function , please check the Gain/Offset value . 1.1.3.1 If the Red, Green, Blue Gain/Offset data are same” 127”,it means this set not yet do the ADC calibration, it must do the calibration function again.
  • Page 16 LC-20SH21U 1.3 Luminance test: (To select “custom mode” by entry “picture setting”) 1.3.1 Input 1360x768 / 60Hz full white pattern at 100IRE. 1.3.2 Adjust contrast & brightness & Backlight to Max., (OSD setting). the Y > 315cd/m2 ( Bmax ). in color temp. Middle/Low mode, the Y >...
  • Page 17 LC-20SH21U 2.4 Input 480P (T#978), 8 x color BAR (100%)+ 16 Gray Scale (100%), (VG859, P#918) (input level 100IRE 0.7Vp-p), (see Figure 1). 2.5 2Select Setting -> Factory Settings->Calibration then do the ADC Calibration 2.6 After the calibration function, please check the Gain/Offset value.
  • Page 18 LC-20SH21U c. Luminance color meter: Minolta CA210 color analyzer. 2. Check criteria: There are four user selectable color setting as specified below: High color temp (12000°K) x = 0.272 ± 0.02 y = 0.278 ± 0.02. Middle color temp (9300°K) x = 0.286 ±...
  • Page 19 LC-20SH21U 4.6 Select to Middle color temp. 9300K °K . 4.7 Adjust RGB gain to meet the x=0.286 +/-0.005 and y=0.294 +/-0.005. 4.8 Select to Low color temp. 6500 °K . 4.9 Adjust RGB gain to meet the x=0.314 +/-0.005 and y=0.324 +/-0.005.
  • Page 20 LC-20SH21U l I/O ports Test: Ø Input 1: Video Connect the Composite Video to a legacy video device such as a VCR or video game system. Ø Input 1: S-Video Connect S-Video to a legacy vi deo device such as a VCR or video game system. If both terminals are connected, S-Video terminal takes a priority Ø...
  • Page 21 LC-20SH21U (HDTV) content. Ø Factory Service Port Refer to “Firmware Upgrade Procedure” (page 22). Ø AC IN (Power) Connect the power cord from AC IN to a power source.

  • Page 22: Firmware Upgrade Procedure

    LC-20SH21U 8. Firmware Upgrade Procedure Ø Firmware Upgrade Step 1 Press the button of LCD TV to turn power off. Step 2 Plug the USB drive for service to USB port located on the ride side of LCD TV Step 3 Press the POWER button on LCD TV to turn power on. The upgrade will start automatically.

  • Page 23: Troubleshooting Analysis

    LC-20SH21U 9. Troubleshooting analysis Defect Mode Failure Analysis Repair Testing Light On Missing Line Check PCBA M/B Change Test Bright Dot Check Panel Panel Change Dark Dot Abnormal Backlight Display Light Leakage Chrominance Check Panel Panel Change non-uniformity Image Sticking...
  • Page 24 LC-20SH21U Defect Mode Failure Analysis Repair Testing Flicker Check PCBA M/B Change Power Board Image is too Change dark Panel Change Gray Value Check PCBA M/B Change Display Check Panel Panel Change R.G.B. Display Check PCBA M/B Change Abnormal Check Panel...
  • Page 25 LC-20SH21U Failure Analysis Repair Testing Defect Mode Display flicker Check PCBA M/B Change (tapping) Panel Change Check Panel Other Abnormal Display Cannot use Remote Control or Check Remote Remote Control Battery Change M/B Change Check PCBA IR Board Change Next Step...
  • Page 26 LC-20SH21U Defect Mode Failure Analysis Repair Testing Video AV, SV, CV Abnormal No image M/B Change Check PCBA (AV, SV, Cable Change Check Cable AV: Composite Video SV: S-Video CV: Component Video Test Complete...

  • Page 27: Exploded View

    LC-20SH21U 10. Exploded View...
  • Page 28 LC-20SH21U...

  • Page 29: Part List

    LC-20SH21U 11. Part List Ø Mechanical Parts : Ref. No. Part Number Description 9NK3081501800 CABLE FFC L330 WHT T1 9NK3100300600 SCREW M M3*0.5*6 PAN C S+P S20C ZN 9NK3100301200 SCREW M M3*0.5*12 PAN C S+P S20C ZN SCREW T f 3*1.06*9 FF C S18C NI 9NK3109019400 SCREW T f 3*2.7*10 FF C S18C ZN BLK...
  • Page 30 LC-20SH21U Ø Accessories: Ref. No. Part Number Description 9NK5041814100 Remote Control 9NK0991210404 "AA" size Battery (x2) 9NK5010055000 MANUAL OPERATION LT20FGN 26AAB LC-20SH21 9NK5010054900 CARD REGISTRATION LT20FGN 26AAB LC-20SH2 Ø Packing Parts: Ref. No. Part Number Description 9NK3513501600 CARTON PAPER 567*261*462...
  • Page 31 LC-20SH21U COPYRIGHT © 2006 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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