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LG 50PG20 User Manual

LG 50PG20
127 pages
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Advanced Single Scan Troubleshooting
Training Manual
50PG20 Plasma Display
50PG20 Plasma Display
720p
720p

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LG 50PG20 Specifications

General IconGeneral
Audio systemSRS TruSurround HD, Dolby Digital
RMS rated power20 W
Number of speakers2
Comb filter3D
Display diagonal50 \
Display brightness1500 cd/m²
Display resolution1365 x 768 pixels
Display technologyLCD
Native aspect ratio16:9
Supported video modes1080i, 1080p, 720p
Contrast ratio (dynamic)1000000:1
ManualYes
Package weight50220 g
HDMI version1.3
HDMI ports quantity3
SCART ports quantity0
Card reader integratedNo
USB 2.0 ports quantityUSB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Digital audio optical out1
Sustainability certificatesENERGY STAR
Product colorBlack
LED indicatorsY, Stand-by
Panel mounting interface400 x 400 mm
Cables includedAC
Power consumption (standby)1 W
Tuner typeAnalog & digital
Analog signal format systemNTSC
Digital signal format systemATSC
Weight and Dimensions IconWeight and Dimensions
Depth (with stand)363.22 mm
Width (with stand)1224.28 mm
Height (with stand)848.36 mm
Weight (with stand)41175 g
Depth (without stand)86.36 mm
Height (without stand)789.94 mm
Weight (without stand)37800 g

Summary

Overview of Topics to be Discussed

Section 1: Topics Covered

Details contact info, safety, specs, overview, troubleshooting, and disassembly.

Section 2: Circuit Operation Focus

Focuses on circuit board operation, troubleshooting, and alignment for major boards.

Preliminary Matters and Safety

Important Safety Notice

Crucial safety warnings for technicians regarding electrical equipment and potential hazards.

ESD Handling Precautions

Details procedures to prevent damage to sensitive electronics from static discharge.

Contact Information

SECTION 1: PLASMA OVERVIEW

Safety and Handling Regulations

Covers pre-run time, voltage adjustment, shock, CMOS, and physical handling of the PDP module.

Checking Points to be Considered

Key checks for appearance, model accuracy, and defect history before service.

Basic Troubleshooting Methodology

Define, Localize, Isolate, Correct

A systematic approach to diagnosing and resolving electronic failures using senses and tests.

50PG20 Specifications

Key Specifications and Features

Lists resolution, XD Engine, HDMI, AV modes, Clear Voice, SimpLink, speakers, and brightness life.

FluidMotion Technology Explained

Describes how FluidMotion provides smoother, clearer motion by increasing picture resolution.

Disassembly Procedures

Disassembly, Layout, and Board Identification

Guides on disassembly procedures, PWB layout, and identification of each circuit board.

Removing the Back Cover

Instructions for removing the back cover, noting screw count and type importance.

Circuit Board Removal Procedures

Provides step-by-step instructions for removing various circuit boards from the TV.

Power Supply System

Switch Mode Power Supply Troubleshooting

Covers common issues and diagnostic steps for the SMPS.

SMPS Static Test Procedures

Outlines methods to test the SMPS functionality without full system load.

SMPS Connector Voltage Measurements

Lists pin IDs and voltage readings for key SMPS connectors.

Y SUS Board Operations

Y SUS PWB Section Overview

Covers Y SUS board operation, adjustments, DC voltage, and waveform checks.

Observing Y and Z SUS Output Waveforms

Guides on using an oscilloscope to view and analyze Y and Z SUS output waveforms.

Y Drive Board Operations

Y-Drive Signal Observation and Adjustments

Explains how to observe and adjust Y-Drive signals like Vsetup and Vsetdn.

Panel Waveform Adjustment Issues

Details waveform distortions from incorrect V Set Up/Dn affecting picture quality.

Z SUS Board Operations

Troubleshooting the Z-SUS PWB

Covers Z-SUS board troubleshooting, test points, and bias adjustments.

Z-SUS Adjustment Procedure

Details the steps for adjusting the Z-Bias using a DVM and test points.

Control PWB Operations

Control PWB Overview and Checks

Covers control board signals, voltages, and quick check procedures.

Control LVDS Signal Analysis

Guides on analyzing LVDS signals from the main board to the control board using an oscilloscope.

X Drive and TCP Operations

X Drive PWBs Overview

Introduces the X Drive PWBs (Left, Center, Right) and their function.

TCP Testing and Visual Observation

Covers TCP testing procedures and visual inspection for damage.

Main PWB Operations

Main PWB Troubleshooting Overview

Introduces troubleshooting the Main Board, including voltage and resistance checks.

Main PWB Layout and Identification

Identifies key components and connectors on the Main PWB.

50PG20 Interconnect Diagram

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