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LG RZ-20LZ50 Service Manual

LG RZ-20LZ50
42 pages
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LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : ML-041B
MODEL : RZ-20LZ50/RT-20LZ50
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html
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LG RZ-20LZ50 Specifications

General IconGeneral
Speakers2 x 5W
I/O portsScart, S-Video, AV Bild
Display diagonal20 \
Display brightness450 cd/m²
Display resolution640 x 480 pixels
Display technologyLCD
Native aspect ratio4:3
Contrast ratio (typical)500:1
Viewing angle, horizontal176 °
Product colorSilver
Weight and Dimensions IconWeight and Dimensions
Depth (without stand)190 mm
Width (without stand)580 mm
Height (without stand)471 mm
Weight (without stand)11500 g

Summary

Key Safety Notices

Key Safety Notices

Key safety warnings and guidelines for servicing the chassis.

General Servicing Guidance

General servicing precautions regarding electrical safety and component handling.

X-Ray Radiation Safety

Information and warnings regarding X-ray radiation sources and measurement.

AC Leakage Current Checks

Procedures for performing AC leakage current checks for safety.

Servicing Precautions

General Servicing Precautions

Essential rules to follow before and during receiver servicing.

Handling ES Devices

Precautions and techniques for handling sensitive electronic components.

Component Replacement Procedures

Component Replacement Procedures

Step-by-step guides for replacing ICs, transistors, diodes, fuses, and resistors.

Adjustment Instructions

Adjustment Procedure Details

Describes the self-adjustment capabilities and manual operation requirements.

Auto Gain/Offset Adjustment Procedures

Procedures for auto-adjusting gain and offset in RF and Component modes.

Hotel Mode

Troubleshooting

Troubleshooting: No Power

Flowchart for diagnosing and resolving 'no power' issues when the LED is off.

Troubleshooting: No Raster

Flowchart for diagnosing and resolving 'no raster' issues on the display unit.

Troubleshooting: Raster Issues (Component)

Troubleshooting flowchart for 'no raster' specifically on component signal input.

Troubleshooting: Raster Issues (AV/RF)

Flowcharts for diagnosing 'no raster' on AV (Video/S-Video) and TV (RF) signals.

Troubleshooting: No Sound

Flowchart for diagnosing and resolving 'no sound' issues.

Block Diagram: RZ-20LZ50

Block Diagram: RT-20LZ50

Schematics

Schematics: Key ICs

Circuit diagrams for VCTI, TC90A65F, M52758FP, and GM2221 ICs.

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