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LG StudioWorks 773N User Manual

LG StudioWorks 773N
34 pages
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COLOR MONITOR
SERVICE MANUAL
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MENU SELECT
MODEL:
StudioWorks 700S (CB777G-NA), StudioWorks 700E (CB777G-AA)
StudioWorks 700B (CB777G-EA)
CHASSIS NO. : CA-109
FACTORY MODEL: CB777G
*( ) ID LABEL Model No.
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LG StudioWorks 773N Specifications

General IconGeneral
Screen Size17 inches
Viewable Size16 inches
Max Resolution1280 x 1024
Recommended Resolution1024 x 768
Panel TypeCRT
Aspect Ratio4:3
Horizontal Frequency30-70 kHz
Vertical Frequency50-160 Hz
Input SignalAnalog RGB
Input Connector15-pin D-sub
Weight35.3 lbs
Power Consumption80 W

Summary

Safety Precautions

Safety-Related Component Warning

Critical components important for safety must be replaced with specified parts.

General Safety Checks and Guidelines

Perform service work only after being familiar with safety checks and servicing guidelines.

Fire and Shock Hazard Precautions

Use isolation transformer, check lead dress, reinstall protective devices, inspect soldering.

X-Radiation Prevention Measures

Measure high voltage to ensure it's at the factory recommended level.

Monitor Operating Instructions

Monitor Views and Connections

Overview of front and rear views, including power and signal connections.

Front Control Panel Functions

Description of the monitor's control buttons and their functions.

Wiring Diagram

Monitor Wiring Schematic

Illustrates the electrical connections within the monitor.

Disassembly Procedures

Back Cover and Tilt/Swivel Removal

Steps to remove the back cover and tilt/swivel base.

Chassis Assembly Removal

Procedure for safely removing the main chassis assembly.

Block Diagram Overview

Monitor Functional Block Diagram

Visual representation of the monitor's internal circuitry and signal flow.

Block Diagram Functionality

Power Generation and Deflection Systems

Describes SMPS, DC-DC converter, High Voltage, and Deflection circuits.

Signal Processing and Control Circuits

Covers Micom, Sync processing, Blanking, and OSD control.

Geometric and Safety Circuits

Details Pincushion, Linearity, and X-ray protection circuits.

Additional Block Diagram Functions

Image Rotation Circuitry

Corrects screen tilt by adjusting the tilt coil.

Video Signal Amplification Stages

Pre-amplifies and amplifies video signals for the CRT.

Monitor Adjustment Procedures

General Setup and Degaussing

Includes required tools, warm-up, and degaussing steps.

Voltage and High-Voltage Calibration

Procedures for setting B+ voltage and CRT high voltage.

Factory Mode and Geometric Correction

Steps for factory mode, size, position, and geometric adjustments.

Color and Luminance Calibration

Adjusting white balance, color bias, and luminance levels.

Advanced Adjustment Procedures

EDID Data Input

Procedure for inputting EDID data for monitor identification.

CRT Focus Adjustment

Steps to adjust the CRT focus for optimal sharpness.

Troubleshooting Guide

No Power Diagnosis

Step-by-step guide to diagnose and resolve no-power issues.

Display and Signal Troubleshooting

No Character or Video Signal Diagnosis

Diagnosing issues when no characters or video are displayed.

Raster and Video Output Troubleshooting

No Raster or Video Output Diagnosis

Troubleshooting steps when no raster is visible on the screen.

Horizontal Deflection Troubleshooting

No Horizontal Deflection (Vertical Line)

Diagnosing issues causing only a vertical line on the screen.

Horizontal Linearity Troubleshooting

Unbalanced Horizontal Linearity Diagnosis

Troubleshooting horizontal linearity problems.

Vertical Deflection Troubleshooting

No Vertical Deflection (Horizontal Line)

Diagnosing issues causing only a horizontal line on the screen.

On-Screen Display (OSD) Troubleshooting

OSD Functionality Issues

Troubleshooting issues with the On-Screen Display menu.

Display Power Management (DPM) Troubleshooting

DPM Mode Failure Diagnosis

Diagnosing issues related to Display Power Management modes.

Degaussing System Troubleshooting

No Degaussing Function Diagnosis

Troubleshooting the degaussing coil and related circuits.

Tilt and Rotation Control Troubleshooting

No Tilt or Rotation Function Diagnosis

Diagnosing issues with screen tilt and rotation adjustments.

Exploded View

Monitor Component Breakdown

Visual representation showing the assembly of monitor components.

Exploded View Parts List

Detailed Part Identification

Comprehensive list of parts with reference numbers and descriptions.

Replacement Parts List

Component Specifications and Part Numbers

List of replaceable components with part numbers and specifications.

Integrated Circuit Pin Configurations

TDA4866J Pinout Details

Pinout and function details for the TDA4866J deflection booster.

M24C08 EEPROM Pinout Details

Pinout and function details for the M24C08 serial I2C bus EEPROM.

STR-G8644D Block Diagram and Pins

Visual representation of the STR-G8644D block diagram and pin connections.

Deflection Controller Pin Configuration

TDA4857 Pinout Details

Pinout and function details for the TDA4857 autosync deflection controller.

Schematic Diagram

Monitor Circuit Schematics

Detailed electrical circuit diagrams of the monitor's internal workings.

Printed Circuit Board Layouts

Control Board Layouts

Component and solder side views of the control PCB.

Main Board Layouts

Component and solder side views of the main PCB.

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