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LG StudioWorks 700B User Manual

LG StudioWorks 700B
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
(700BJ-AL**M, AL**B)
StudioWorks 700B
(700BJ-AL**E)
StudioWorks 700E
(700BJ-AL**A, AL**K)
CHASSIS NO. : CA-131
( ) **Same model for Service
*Same looking with new chassis.
Issue Date; 2003. 5.
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LG StudioWorks 700B Specifications

General IconGeneral
Screen Size17 inches
Maximum Resolution1280 x 1024
Dot Pitch0.27 mm
Input ConnectorsVGA
Viewable Image Size16 inches
Horizontal Scan Rate30-70 kHz
Vertical Scan Rate50-160 Hz
Aspect Ratio4:3
Display TypeCRT

Summary

SPECIFICATIONS

Picture Tube Specifications

Details of the monitor's picture tube specifications, including size, deflection angle, and neck diameter.

Signal Specifications

Specifications for video input signals, including voltage levels, impedance, and connector types.

Power Supply Details

Details on the monitor's input power range, voltage, and current consumption.

Display Area Information

Information on active video area, preset image sizes, display color, resolution, and bandwidth.

Environment Specifications

Operating temperature, relative humidity, and maximum altitude specifications.

Dimensions

Physical dimensions of the monitor including width, depth, and height with tilt/swivel.

Weight Specifications

Net and gross weight specifications for the monitor in kilograms and pounds.

SAFETY PRECAUTIONS

Safety-Related Components and Warnings

Identifies critical safety components and provides general warnings for servicing the monitor.

High Voltage and Fire Safety

Precautions regarding high voltage circuits, lead dress, and fire hazards during service operations.

X-Radiation Prevention

Guidelines for measuring high voltage and steps to prevent X-radiation exposure.

TIMING CHART

OPERATING INSTRUCTIONS

Front Control Panel Overview

Description of the monitor's front panel buttons and their respective functions.

WIRING DIAGRAM

DISASSEMBLY

Tilt/Swivel & Back Cover Removal

Step-by-step instructions for removing the monitor's back cover and tilt/swivel mechanism.

Total Chassis Assembly Removal

Procedure for safely detaching the main chassis assembly from the front cabinet.

BLOCK DIAGRAM

DESCRIPTION OF BLOCK DIAGRAM

Line Filter & Associated Circuit

Explains the function of the line filter for suppressing noise on the power input line.

Degauss Circuit & Coil

Details the degaussing circuit, its components, and operation for color purity.

SMPS (Switching Mode Power Supply)

Describes the operation of the switching mode power supply unit, including input and output.

X-ray Protection

Explains the mechanism to prevent X-radiation by monitoring high voltage levels.

Micom (Microprocessor) Circuit

Overview of the microprocessor's role in controlling monitor functions and OSD.

Horizontal and Vertical Oscillation

Description of the circuit generating horizontal and vertical scan pulses from sync signals.

D/D (DC to DC) Converter

Details the DC to DC converter used for voltage conversion in the deflection circuit.

Side-Pincushion & Trapezoid Correction Circuit

Explains the circuit that corrects side-pincushion and trapezoid distortion of the screen.

Horizontal Deflection Output Circuit

Description of the circuit responsible for generating horizontal deflection current for the yoke.

High Voltage Output & FBT (Flyback Transformer)

Details the high voltage generation circuit and the flyback transformer's role.

H-Linearity Correction Circuit

Explanation of the circuit designed to correct horizontal linearity issues.

Vertical Output Circuit

Description of the circuit responsible for generating vertical deflection current for the yoke.

Dynamic Focus Output Circuit

Explains the circuit for maintaining consistent focus across the entire screen.

H & V Blanking and Brightness Control

Details the blanking circuits for retrace elimination and brightness control.

Image Rotation (Tilt) Circuit

Describes the circuit that corrects screen image tilt by supplying a signal to the tilt coil.

Video Pre-Amp Circuit

Explains the pre-amplification stage for incoming analog video signals.

Video Output Amp Circuit

Details the video output amplification stage that drives the CRT cathode.

ADJUSTMENT

General Information and Tools

Overview of adjustment procedures, requirements, and the necessary alignment tools.

Automatic and Manual Degaussing

Instructions for performing automatic degaussing and manual degaussing via OSD.

Adjustment Procedures

Detailed steps for various calibration procedures, including B+ voltage and factory modes.

White Balance and Luminance Adjustment

Procedures for adjusting white balance, color, and screen luminance using alignment tools.

Input EDID Data

Procedure for writing and confirming Extended Display Identification Data (EDID).

Focus Adjustment

Steps for adjusting the screen focus by manipulating controls on the Flyback Transformer (FBT).

TROUBLESHOOTING GUIDE

No Power Troubleshooting

Diagnostic flowchart for troubleshooting issues where the monitor does not power on.

No Character Troubleshooting

Diagnostic flowchart for troubleshooting the absence of any display output or characters.

No Raster Troubleshooting

Diagnostic flowchart for troubleshooting issues where no display image (raster) appears.

No Horizontal Deflection

Diagnostic flowchart for troubleshooting problems related to horizontal picture deflection.

H-Linearity Trouble

Diagnostic steps for identifying and resolving horizontal linearity distortion issues.

No Vertical Deflection

Diagnostic flowchart for troubleshooting problems related to vertical picture deflection.

OSD Trouble

Diagnostic flowchart for troubleshooting issues with the On-Screen Display (OSD) functionality.

DPM Trouble

Diagnostic steps for troubleshooting Display Power Management (DPM) mode failures.

No Degaussing

Diagnostic flowchart for troubleshooting issues with the monitor's degaussing function.

No Tilt (No Rotation)

Diagnostic flowchart for troubleshooting problems related to image tilt or rotation.

EXPLODED VIEW

EXPLODED VIEW PARTS LIST

REPLACEMENT PARTS LIST

PIN CONFIGURATION

M24C08 Serial I2C BUS EEPROM Pinout

Pin description and diagram for the M24C08 serial I2C BUS EEPROM chip.

TDA4867J Philips Pinout

Pin description and block diagram for the TDA4867J Philips deflection controller IC.

TDA4841PS Philips Pinout

Pin description and block diagram for the TDA4841PS Philips video processing IC.

SCHEMATIC DIAGRAM

PRINTED CIRCUIT BOARD

Control Board Layout

Illustrations showing the component and solder sides of the monitor's control board.

Main Board Layout

Illustrations showing the component and solder sides of the monitor's main board.

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