Table of Contents
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Service Manual
Specifications
Power Source:
Rated Power Consumption:
Stand-by Power Consumption: 0.25W (Without monitor out recording)
Aerial Impedance:
Receiving System:
PC signals:
Receiving Chanels:
Aerial - Rear:
Operating Conditions:
Intermediate Frequency:
Video/Audio
Video
Audio
Colour
220-240V AC, 50Hz
188W
17W (With monitor out recording)
75Ω unbalanced, Coaxial Type
PAL-I/H, B/G, D/K
SECAM B/G, D/K, L/L'
PAL-525/60 (AV only)
DVB-T (Digital Terrestrial Services (MPEG2 and MPEG4-AVC(H.264))
DVB-C (Digital cable services (MPEG2 and MPEG4-AVC(H.264))
M.NTSC (AV only)
NTSC (AV only)
VGA, SVGA, WVGA, XGA, SXGA, WXGA (compressed)
Horizontal scanning frequency
Vertical scanning frequency
VHF E2-E12
VHF A-H (ITALY)
VHF R3-R5
UHF E21-E69
CATV S1-S10 (M1-M10)
CATV S21-S41 (Hyperband)
/
VHF
UHF
Temperature :0°C ÷ 35°C
:20% ÷ 80% RH (non condensing)
Humidity
38.9MHz, 33.9MHz
33.4MHz (B/G), 33.16MHz (A2)
33.05MHz (NICAM B/G, D/K, L')
32.4MHz (D/K), 32.66MHz (CZ STEREO)
40.4MHz (L'), 39.75MHz (L' NICAM)
34.47MHz (PAL)
34.5MHz, 34.65MHz (SECAM)
38.3MHz, 38.15MHz (SECAM L')
Colour LCD Television
TX-L42G20E
TX-L42G20ES
TX-LF42G20S
GLP25 Chassis
31 – 69 kHz
59 – 86 Hz
VHF H1-H2 (ITALY)
VHF R1-R2
VHF R6-R12
CATV (S01-S05)
CATV S11-S20 (U1-U10)
ORDER No. PCZ1005063CE
© Panasonic Corporation 2010.
Unauthorized copying and
distribution is a violation of law.
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Table of Contents
Related Manuals for Panasonic Viera TX-LF42G20S
Summarization of Contents
TV Specifications and Features
General Specifications
Details power, impedance, and receiving system for the TV.
Input Signal Compatibility
Lists supported PC signals and intermediate frequencies for video/audio.
Safety Precautions and Guidelines
General Service Guidelines
Advises on lead dress, protective devices, and final checks.
Touch Current Testing Procedure
Outlines the steps for performing touch current checks.
Electrostatic Discharge (ESD) Prevention
ESD Protection Techniques
Details methods to prevent damage to sensitive electronic components.
Lead Free Solder Information
Handling Lead Free Solder
Provides cautions and best practices for working with lead-free solder.
Applicable Signal Compatibility
Component and HDMI Signal Support
Lists supported signal formats for Component and HDMI inputs.
PC Signal Timing Standards
Details horizontal and vertical frequencies for PC inputs.
Service Hints and Backcover Removal
Backcover Removal Procedure
Step-by-step instructions for removing the TV's back cover.
Chassis and Wiring Layout
Board Layout Overview
Identifies main boards (A, P, V, G, TC) within the chassis.
Lead Wiring Identification
Illustrates the location and routing of key internal wiring.
Technical Description and Model Keys
Key Specification for CI Plus/DTCP-IP
Details key generation for specific digital content protection standards.
Model-Specific Key Support
Lists which models support CI Plus, DTCP-IP, and One-to-One features.
Setting Inspection and Voltage Confirmation
A Board Voltage Checks
Lists test points and expected voltages for the A-board.
TC and P Board Voltage Checks
Lists test points and expected voltages for TC and P boards.
Self-Check Procedure
Entering and Exiting Self-Check Mode
Explains how to initiate and exit the TV's self-diagnostic mode.
Self-Check Results and Component Mapping
Shows self-check results and maps them to PCB components.
Power LED Blinking Timing Chart
LED Blinking Codes for Fault Diagnosis
Correlates power LED blink patterns with specific error conditions.
Service Mode Functionality
How to Enter Service Mode
Provides the specific button sequence to access the service menu.
Service Mode Operations
Service Menu Navigation and Key Commands
Explains button functions for adjusting settings in service mode.
White Balance and Picture Adjustments
Details adjustment procedures for contrast, color, tint, and backlight.
Service Tool Mode Access
Accessing and Using Service Tool Mode
Describes how to enter and utilize the service tool mode for diagnostics.
Hotel Mode Configuration
Hotel Mode Purpose and Access
Explains the function of hotel mode and how to activate it.
Hotel Mode Setup Options
Details settings for input, volume, button locks, and remote control.
Data Copy via SD Card
Board Replacement Data Transfer
Describes copying data to SD card for A-board replacement.
Hotel Installation Data Transfer
Explains copying data to SD card for hotel unit installations.
Data Copy from TV to SD Card
Process for Copying TV Data to SD Card
Outlines steps and passwords for copying TV data to an SD card.
Data Copy from SD Card to TV
Process for Copying SD Card Data to TV
Details steps and passwords for loading data from SD card to TV.
Option Bytes Description
OPTION1 and OPTION2 Bytes
Explains settings for various features in OPTION1 and OPTION2.
OPTION3 and OPTION4 Bytes
Explains settings for various features in OPTION3 and OPTION4.
Adjustment Methods
Sub-Contrast Adjustment
Describes the procedure for adjusting sub-contrast using specific signals.
White Balance Adjustment Procedure
Details the process for white balance adjustment using software.
Wiring Diagram Overview
A-BOARD Wiring Connections
Shows connections between A-Board, G-Unit, P-Board, V-Board, and TC-Board.
Block Diagram (A-Board 1/3)
A-BOARD Power and Signal Flow
Illustrates power distribution and signal paths on the A-Board.
Parts Location Overview
External Component Locations
Identifies locations of external parts like the panel, remote, and stand.
Replacement Parts List
Common and Exploded View Parts
Lists common parts and items in the exploded view with part numbers.
Miscellaneous Components and ICs
Details miscellaneous components, ICs, and their part numbers.
Schematic Diagrams Notes
Schematic Diagram Conventions
Explains symbols for resistors, capacitors, coils, test points, and earth.
Voltage Measurement and Signal Paths
Details voltage measurement methods and signal path indicators.
A-BOARD Schematic (1/23)
A-BOARD Power and Development Connectors
Shows power distribution and development interface connections on A-BOARD.
A-BOARD Schematic (3/23)
A-BOARD Clock Generation and CPU Bus
Details clock generation circuitry and CPU bus signals on A-BOARD.
A-BOARD Schematic (14/23)
A-BOARD Video Output and ZWEI2 Control
Shows video output circuits and ZWEI2 control interface on A-BOARD.
A-BOARD Schematic (6/23)
A-BOARD SOS and Power/Panel Control
Illustrates SOS circuit and power/panel control signals on A-BOARD.
A-BOARD Schematic (7/23)
A-BOARD HDMI Input Circuits
Details the HDMI input circuitry on the A-BOARD.
A-BOARD Schematic (8/23)
A-BOARD HDMI Signal Routing
Shows signal routing for HDMI interfaces on the A-BOARD.
A-BOARD Schematic (9/23)
A-BOARD Audio Amplifier and Input Circuits
Details audio amplifier and input/output circuits on A-BOARD.
A-BOARD Schematic (10/23)
A-BOARD AV Input/Output Circuits
Illustrates AV input and output signal paths on the A-BOARD.
A-BOARD Schematic (11/23)
A-BOARD Audio Input/Output and Q-Link
Details audio input/output and Q-Link circuits on the A-BOARD.
A-BOARD Schematic (12/23)
A-BOARD Audio/Video Switching and PC Input
Shows audio/video switching and PC input circuits on the A-BOARD.
A-BOARD Schematic (13/23)
A-BOARD LCD Tuner and Tuner Circuits
Illustrates LCD tuner and tuner circuits on the A-BOARD.
A-BOARD Schematic (14/23)
A-BOARD ZWEI2 Control and Video Output
Details ZWEI2 control and video output signals on the A-BOARD.
A-BOARD Schematic (15/23)
A-BOARD Analog ASIC and ROHM MUTE
Shows analog ASIC and ROHM mute circuits on the A-BOARD.
A-BOARD Schematic (16/23)
A-BOARD Power Supply Circuits (SUB5V, SUB9V)
Details power supply circuits for SUB5V and SUB9V on A-BOARD.
A-BOARD Schematic (17/23)
A-BOARD DVB-T/C Demodulator Circuit
Illustrates the DVB-T/C demodulator circuit on the A-BOARD.
A-BOARD Schematic (18/23)
A-BOARD Adjustment and Development Interfaces
Shows adjustment/development connectors and USB interface on A-BOARD.
A-BOARD Schematic (20/23)
A-BOARD Dchip and Achip Power/GND
Details power and ground connections for Dchip and Achip on A-BOARD.
A-BOARD Schematic (21/23)
A-BOARD PEAKS-LDA2 Power Distribution
Shows power distribution for PEAKS-LDA2 on Dchip and Achip.
P-BOARD Schematic (1/2)
P-BOARD PFC and Power Control Circuits
Illustrates PFC and power control circuits on the P-BOARD.
TC-BOARD Schematic (1/6)
TC-BOARD LVDS Receiver and Inverter
Details LVDS receiver and inverter circuits on the TC-BOARD.
TC-BOARD Schematic (2/6)
TC-BOARD Power Supplies and SPI Interface
Shows power supplies and SPI interface on the TC-BOARD.
TC-BOARD Schematic (5/6)
TC-BOARD Level Shifter and DC-DC Converter
Details level shifter and DC-DC converter circuits on the TC-BOARD.
V-BOARD Schematic
V-BOARD LED Driver Circuits
Illustrates LED driver circuits and connections on the V-BOARD.
A-BOARD Conductor View (Top)
A-BOARD Top Layer Component Placement
Shows the physical layout and placement of components on the A-BOARD top.
P-BOARD Conductor View (Top)
P-BOARD Top Layer Component Placement
Illustrates the physical layout of components on the P-BOARD top layer.
TC-BOARD Conductor View (Top)
TC-BOARD Top Layer Component Placement
Shows component placement and layout on the TC-BOARD top layer.
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