Sharp LC-90LE740X User Manual

SERVICE MANUAL
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.
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
SAFETY PRECAUTION
IMPORTANT SERVICE SAFETY PRE-
CAUTION ............................................................i
PRECAUTIONS FOR USING LEAD-FREE
SOLDER ............................................................ii
OUTLINE
MAJOR SERVICE PARTS ................................ iii
CHAPTER 1. SPECIFICATIONS
[1] SPECIFICATIONS ......................................... 1-1
CHAPTER 2. OPERATION MANUAL
[1] OPERATION MANUAL .................................. 2-1
CHAPTER 3. DIMENSIONS
[1] DIMENSIONS ................................................ 3-1
CHAPTER 4. REMOVING OF MAJOR PARTS
[1] REMOVING OF MAJOR PARTS ................... 4-1
[2] The location putting on the heat measure
sheet .............................................................. 4-6
[3] Precautions for assembly............................... 4-7
CHAPTER 5. ADJUSTMENT
[1] ADJUSTMENT PROCEDURE ......................5-1
[2] PUBLIC MODE SETTING PROCEDURE......5-14
[3] USB Clone Specifications............................5-21
CHAPTER 6. TROUBLESHOOTING TABLE
[1] Failure diagnosis by LED in front of cabinet........6-1
[2] LED flashing specification at the time of an
error (Center icon LED used) ........................6-1
[3] TROUBLESHOOTING TABLE ......................6-5
CHAPTER 7. MAJOR IC INFORMATIONS
[1] MAJOR IC INFORMATIONS .........................7-1
CHAPTER 8. OVERALL WIRING/SYSTEM BLOCK
DIAGRAM
[1] OVERALL WIRING DIAGRAM......................8-1
[2] SYSTEM BLOCK DIAGRAM.........................8-2
Parts Guide
TopPage
LC-90LE740X
CONTENTS
LCD COLOR TELEVISION
LC-90LE740X
MODEL
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its orig-
inal condition and only parts identical to those specified should be used.
No. SY2A4LC90LE74

Sharp LC-90LE740X Specifications

General

Brand	Sharp
Model	LC-90LE740X
Category	LCD TV
Language	English

Summary

SAFETY PRECAUTION

IMPORTANT SERVICE SAFETY PRECAUTION

WARNINGS AND CAUTIONS

Critical safety warnings regarding modifications, fire risks, and leakage current checks.

PRECAUTIONS FOR USING LEAD-FREE SOLDER

CHAPTER 1. SPECIFICATIONS

CHAPTER 4. REMOVING OF MAJOR PARTS

CHAPTER 5. ADJUSTMENT

ADJUSTMENT PROCEDURE OVERVIEW

General guidance for adjustments after component replacement.

SOFTWARE VERSION UPGRADE

Procedures for upgrading main and monitor microprocessor software.

MONITOR MICROPROCESSOR SOFTWARE UPGRADE

Steps for upgrading monitor microprocessor software.

ENTERING AND EXITING ADJUSTMENT MODE

REMOTE CONTROL AND DISPLAY IN ADJUSTMENT MODE

ADJUSTMENT PROCESS MENU LIST

Comprehensive list of adjustment items and their remarks.

VIDEO SIGNAL ADJUSTMENT PROCEDURES

Procedures for adjusting various video signal inputs like PAL, NTSC, SECAM.

PC SIGNAL AND WHITE BALANCE ADJUSTMENTS

Procedures for adjusting PC input and white balance.

KEY WRITING AND FACTORY SETTING

PUBLIC MODE SETTING PROCEDURE

How to start, exit, and configure public mode settings.

PUBLIC MODE MENU OPTIONS

List and description of public mode settings.

ON SETTING ITEMS

232C POWER CONTROL AND PUBLIC MODE SETTING

CHAPTER 6. TROUBLESHOOTING TABLE

FAILURE DIAGNOSIS BY FRONT LED

Diagnosing issues based on front LED status.

LED FLASHING SPECIFICATIONS AND PATTERNS

Details on LED error codes and flashing patterns.

TROUBLESHOOTING FLOWCHARTS

Flowcharts for specific issues like backlight, panel, and controller board problems.

HDMI INPUT NO VIDEO TROUBLESHOOTING

Step-by-step guide for diagnosing no video on HDMI inputs.

COMPOSITE INPUT NO VIDEO TROUBLESHOOTING

Guide for diagnosing no video on composite and PC inputs.

BROADCAST SIGNAL RECEPTION TROUBLESHOOTING

Guides for diagnosing no video/audio from broadcast signals.

HDMI AUDIO TROUBLESHOOTING

DIGITAL AUDIO OUTPUT TROUBLESHOOTING

MONITOR AUDIO OUTPUT TROUBLESHOOTING

CHAPTER 8. OVERALL WIRING/SYSTEM BLOCK DIAGRAM