Panasonic TH-42LRU20 - User Manual

© Panasonic Corporation 2010
Unauthorized copying and distribution is a violation
of law.
Order Number MTNC100664CE
B32 Canada: B61
Hospitality LCD HDTV
Model No. TH-42LRU20
LA11 Chassis
TABLE OF CONTENTS
PAGE PAGE
1 Safety Precautions----------------------------------------------- 3
1.1. General Guidelines---------------------------------------- 3
2 Warning-------------------------------------------------------------- 4
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostatically Sensitive (ES) Devices---------- 4
2.2. About lead free solder (PbF)---------------------------- 5
3 Service Navigation----------------------------------------------- 6
3.1. Service Hint ------------------------------------------------- 6
3.2. Applicable signals ----------------------------------------- 6
4 Specifications ----------------------------------------------------- 7
5 Service Mode ------------------------------------------------------ 8
5.1. How to enter into Service Mode ----------------------- 8
5.2. SRV-TOOL -------------------------------------------------- 9
5.3. Hotel mode-------------------------------------------------10
5.4. Data Copy by SD Card----------------------------------11
6 Troubleshooting Guide----------------------------------------14
6.1. Check of the IIC bus lines ------------------------------14
6.2. Power LED Blinking timing chart ---------------------15
6.3. No Power--------------------------------------------------- 15
7 Disassembly and Assembly Instructions--------------- 16
7.1. Removal of Rear Cover -------------------------------- 16
7.2. Removal of Pedestal Assy----------------------------- 16
7.3. Removal of AC Cord ------------------------------------ 16
7.4. Removal of Control Panel Assy ---------------------- 16
7.5. Removal of P-Board------------------------------------- 16
7.6. Removal of TA-Board ----------------------------------- 16
7.7. Removal of Side AV Bracket -------------------------- 17
7.8. Removal of A-Board------------------------------------- 17
7.9. Removal of Speaker Unit (L, R) ---------------------- 17
7.10. Removal of V-Board------------------------------------- 18
7.11. Removal of LCD Panel and Cabinet Assy--------- 18
8 Measurements and Adjustments -------------------------- 20
8.1. Voltage chart of A-board ------------------------------- 20
8.2. Picture level adjustment (RF) ------------------------- 20
9 Block Diagram --------------------------------------------------- 21
9.1. Main Block Diagram ------------------------------------ 21

Summary

Safety Precautions

General Safety Guidelines

General guidelines for safe repair and servicing procedures.

Leakage Current Checks

Procedures to check leakage current for shock hazard prevention.

Electrostatic Discharge (ESD) Prevention

Service Mode Operations

Service Mode Access and Key Commands

How to enter, navigate, and use the service mode adjustments.

SRV-TOOL and SOS History

Data Copy by SD Card

Troubleshooting Guide

IIC Bus and Self-Check Procedures

Steps to check IIC bus lines and perform unit self-checks.

Power LED Blinking and No Power Issues

Interpreting LED blinking codes and troubleshooting power failures.

Measurements and Adjustments

A-Board Voltage Chart

Table listing test points and expected voltages on the A-board.

Picture Level Adjustment (RF)

Block Diagrams

Main and Detailed Block Diagrams

Schematic Diagrams

A-Board Schematic Diagrams

Wiring Connection Diagram

Wiring Connections

Parts Lists

Electrical Replacement Parts List

Panasonic TH-42LRU20 Specifications