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Sharp LL-T1820-H Service Manual

Sharp LL-T1820-H Service Manual

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CHAPTER 3. DISASSEMBLY AND ASSEMBLY . . . . . . . . . . . . . . . . . . . 3 - 1
CHAPTER 4. TROUBLE SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 1
CHAPTER 5. WAVE FORM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1
CHAPTER 6. BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 - 1
CHAPTER 7. CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 1
CHAPTER 8. PARTS LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 1

Parts marked with "
" are important for maintaining the safety of the set. Be sure to replace these parts with specified
ones for maintaining the safety and performance of the set.
SERVICE MANUAL
MODEL
CONTENTS
SHARP CORPORATION
CODE : 00ZLLT1820SME
LCD MONITOR
LL-T1820
LL-T1820
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
-H
-B

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Summary of Contents for Sharp LL-T1820-H

  • Page 1: Table Of Contents

    " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set. This document has been published to be used for after sales service only. SHARP CORPORATION The contents are subject to change without notice.
  • Page 2 If a user erroneously allows an overcurrent to flow through an USB device, the PTC101 cuts off the current. When repaired, it returns to normal. Note this operation of the PTC 101 in case of an USB error. LL-T1820-H/B SERVICE PRECAUTION...
  • Page 3: Chapter 1. Outline Of The Product, Nomenclature And Function

    Upward 0° - 30° ; downward 0° - 5° Digital signal cable: Approx. 2.0 m • Screen swivel Analogue signal cable: Approx. 2.0 m 90° from left through right USB cable: Approx. 1.8 m LL-T1820-H/B OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION 1 – 1...
  • Page 4 TMDS clock - TMDS data 1+ Analogue red image signal TMDS data 1/3 shield Analogue green image signal N.C. Analogue blue image signal N.C. Analogue horizontally synchronised signal Analogue GND LL-T1820-H/B OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION 1 – 2...
  • Page 5 These buttons are used to adjust backlight brightness . 5. Power button 6. Power LED: This LED is lit green when in use and orange when in power-saving mode. 7. USB port (downstream: 2 ports) LL-T1820-H/B OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION 1 – 3...
  • Page 6 Adjust to an easy to view height. 80mm Note: The orientation of the display can be changed using Pivot Soft- ware. Angle adjustment Adjust to an easy to view angle. LL-T1820-H/B OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION 1 – 4...
  • Page 7: Chapter 2. Connection, Adjustment, Operation, And Functions

    If it cannot be turned, rehouse the cable with sufficient slack. (If there is insufficient cable length, rotation will be impossible. Forcing rotation may cause cable disconnection.) LL-T1820-H/B CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 1...
  • Page 8 • Do not set to [ON] if you are not using a Belkin ADC-DVI adapter, as this may result in incorrect display. 4. Press the power button, and turn off the monitor power. USB cable This completes setting. LL-T1820-H/B CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 2...
  • Page 9 MS-DOS screen may not be able to display properly. In this case, change the settings so that only the monitor is displaying. LL-T1820-H/B CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 3...
  • Page 10 Using different screws could lead to a malfunction. Caution: Do not disassemble the stand. Parts may spring out and cause injury. LL-T1820-H/B CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 4...
  • Page 11 VERSION 1.00 2001. 12. 10 CHECKSUM BOOT 7) Aging (for service) Power ON INPUT MENU SELECT Green Blue Yellow Purple Light Blue White Black When the test is terminate, Power off. LL-T1820-H/B CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 5...
  • Page 12 ITALIANO, NETHER- Dutch, English, French, German, Spanish, Italian, LAND, SVENSKA Swedish. SELECT Select the item < > 0~31 Adjusting the backlight POWER OFF LL-T1820-H/B CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS 2 – 6...
  • Page 13: Chapter 3. Disassembly And Assembly

    8) Remove the seven harnesses N. Remove the three screws O and remove the inverter PWB G. 9) Remove the six screws P Q. Remove the angles H, I, J from the LCD unit K. LL-T1820-H/B DISASSEMBLY AND ASSEMBLY 3 – 1...
  • Page 14 9) Remove one screw G and remove the *** G. 10) Remove the three screws H and remove the *** H. 11) Remove the 17 screws and remove the *** I, *** J and *** K. LL-T1820-H/B DISASSEMBLY AND ASSEMBLY 3 – 2...
  • Page 15: Chapter 4. Trouble Shooting

    (Yes) 4th pin of IC602 is in H level (DC+5 V)? (No) Check RESET circuit around IC602. (Yes) C610-side terminal signal of X600 is normal? (No) Check IC601 and clock circuit around X600. (Yes) LL-T1820-H/B TROUBLE SHOOTING 4 – 1...
  • Page 16 PWB unit is about 750 Vrms? (Use caution not to get electric shock accident. Use (No) Replace inverter PWB unit with a new one. a high-voltage probe (more than 100:1) for measuring voltage.) (Yes) Check lamp inside LCD module. LL-T1820-H/B TROUBLE SHOOTING 4 – 2...
  • Page 17 (Yes) Check circuits around IC501. ADJUSTMENT and MODE SELECT are set Adjust according to "screen adjustment LCD screen jitters or flickers? (Yes) (No) properly? procedure". (No) (Yes) Check circuits around IC300, IC301, and IC401. LL-T1820-H/B TROUBLE SHOOTING 4 – 3...
  • Page 18 17th, 18th, 23rd, and 24th pins) are normal? and digital signal cable. (Yes) IC101 and IC203 signal output (ID0 ID47, (No) Check circuits around IC101 and IC203. HIS, IVS,ICK, IACT) are normal? (Yes) Check circuits around IC501. LL-T1820-H/B TROUBLE SHOOTING 4 – 4...
  • Page 19: Chapter 5. Wave Form

    Input signal: VESA1280 X 1024 H: 80kHz V: 75Hz DOTCLK: 135MHz WAVE FORM1 : REFCK (LD500) Frequency: 60MHz Display screen: Arbitrary PV/DIV, 10ns/DIV WAVE FORM3 : VSYNC (LD304) Frequency: 75Hz Display screen: Arbitrary 1V/DIV, 5s/DIV LL-T1820-H/B WAVE FORM 5 – 1...
  • Page 20 Display screen: Arbitrary Display screen: Arbitrary 1V/DIV, 5µs/DIV 1V/DIV, 5s/DIV WAVE FORM5 : ICK (LD510) WAVE FORM7 : IHS (LD513) Frequency: 67.5MHz Frequency: 80kHz Display screen: Arbitrary Display screen: Arbitrary 1V/DIV, 5s/DIV 1V/DIV, 5µs/DIV LL-T1820-H/B WAVE FORM 5 – 2...
  • Page 21 WAVE FORM10 : RGBOUT (LD300, LD301, LD302) Frequency: 60MHz Display screen:16 monochromatic gradation patterns Display screen: Arbitrary 0.5V/DIV, 5µs/DIV 1V/DIV, 5ns/DIV WAVE FORM9 : DEN (9pin of the IC701) Frequency: 80kHz Display screen: Arbitrary 1V/DIV, 5µs/DIV LL-T1820-H/B WAVE FORM 5 – 3...
  • Page 22: Chapter 6. Block Diagram

    PC-UM10M LL-T1820-H/B BLOCK DIAGRAM 6 – 1...
  • Page 23 PC-UM10M LL-T1820-H/B CIRCUIT DIAGRAM 7 – 1...
  • Page 24 PC-UM10M LL-T1820-H/B CIRCUIT DIAGRAM 7 – 2...
  • Page 25 PC-UM10M LL-T1820-H/B CIRCUIT DIAGRAM 7 – 3...
  • Page 26 PC-UM10M LL-T1820-H/B CIRCUIT DIAGRAM 7 – 4...
  • Page 27 PC-UM10M LL-T1820-H/B CIRCUIT DIAGRAM 7 – 5...
  • Page 28 PC-UM10M LL-T1820-H/B CIRCUIT DIAGRAM 7 – 6...
  • Page 29 PC-UM10M LL-T1820-H/B CIRCUIT DIAGRAM 7 – 7...
  • Page 30 PC-UM10M LL-T1820-H/B CIRCUIT DIAGRAM 7 – 8...
  • Page 31 PC-UM10M LL-T1820-H/B CIRCUIT DIAGRAM 7 – 9...
  • Page 32 PC-UM10M LL-T1820-H/B CIRCUIT DIAGRAM 7 – 10...
  • Page 33: Chapter 8. Parts Layout

    PC-UM10M CHAPTER 8. PARTS LAYOUT POWER BOARD LL-T1820-H/B PARTS LAYOUT 8 – 1...
  • Page 34 PC-UM10M MAIN BOARD LL-T1820-H/B PARTS LAYOUT 8 – 2...
  • Page 35 PC-UM10M MAIN BOARD USB BOARD LL-T1820-H/B PARTS LAYOUT 8 – 3...
  • Page 36 © COPYRIGHT 2002 BY SHARP CORPORATION All rights reserved. Printed in Japan. 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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