Panasonic Technical Guide TC-22LH1 LCD Television.pdf

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Technical Guide
TC-22LH1
LCD Television
Technology, Troubleshooting, &
Adjustments
Panasonic Services Company
National Training Center
Produced by
Gerald Gaimo &
Jean Magloire
Panasonic Services Company
National Training Department
Secaucus, NJ
Warning
This service information is designed for experienced repair technicians only and is not designed for use by
the general public. It does not contain warnings or cautions to advise non-technical individuals of potential
dangers in attempting to service a product. Products powered by electricity should be serviced or repaired
only by experienced professional technicians. Any attempt to service or repair the product or products
dealt with in this service information by anyone else could result in serious injury or death.
Table Of Contents
2
Introduction ........................................................................................................ 5
Chapter 1 Technology Explanation .................................................................. 7
1.1 Properties of Liquid Crystals .................................................................................. 7
1.2 LCD Basic Reflective Assembly............................................................................. 8
1.3 Backlighting vs. Reflective ..................................................................................... 8
1.4 Color ...................................................................................................................... 9
1.5 LCD Addressing Technology ............................................................................... 10
1.6 Backlighting ......................................................................................................... 11
1.7 Inverter Power Supply ......................................................................................... 11
1.8 High Voltage Power Supply ................................................................................. 12
1.9 Test and Measurement........................................................................................ 13
1.10 Features ............................................................................................................ 14
Chapter 2 Circuit Descriptions........................................................................ 16
Block Diagram Overview ........................................................................................... 18
Chapter 3 Video Circuit Explanations ............................................................ 20
Video Signal Block Diagram ...................................................................................... 20
NTSC Video Signal Path ........................................................................................... 22
ATSC Video Signal Path............................................................................................ 23
HDMI Signal Path ...................................................................................................... 24
Picture Processing..................................................................................................... 25
Resizing The Screen ................................................................................................. 27
Chapter 4 Audio Circuit Explanations ............................................................ 28
Audio Signal Block Diagram ...................................................................................... 28
Multiplexed Television Sound (MTS) ........................................................................ 29
Surround Sound Processing...................................................................................... 31
Power Supply Section................................................................................................ 32
Chapter 5 Unit Disassembly ...................................................................34
Rear Cover Removal ................................................................................................. 34
AP Board Removal .................................................................................................... 35
DV Board Removal .................................................................................................... 36
DG Board Removal.................................................................................................... 36
B1 Board Removal..................................................................................................... 37
H Board Removal ...................................................................................................... 37
Speaker Removal ...................................................................................................... 38
K Board (Button Board) Removal .............................................................................. 38
V Board (remote sensor) Removal ............................................................................ 39
LCD Panel Removal .................................................................................................. 39
Chapter 6 Self Check and Adjustment ........................................................... 41
Self Check ................................................................................................................. 41
Service mode Adjustment.......................................................................................... 42
Main Adjustment SUB Adjustment ............................................................................. 43
3
SUB Adjustment ........................................................................................................ 44
LCD Pixel Specifications............................................................................................ 45
4
Introduction
The information provided in this document is designed to give the technician a brief
overview of the LCD display technology. It is also intended to help the technician
diagnose and identify the defective printed circuit board, efficiently. This guide covers
the Panasonic TC-22LH1 LCD television. Troubleshooting flow charts, signal path
diagrams, and connector information are included to provide enough details, so the
technician could accurately determine which of the boards contains the source of the
problem. Alignment and adjustment procedures are also included in this document to
complement the information available in the service manual.
5

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