Table of Contents
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SERVICE MANUAL
INTEGRATED DIGITAL TERRESTRIAL/SATELLITE LCD TELEVISION
8 S ERVICE MANUAL
YA606<Rev.002>
2008
LT-26DA9BJ, LT-26DA9BN,
LT-26DA9BU, LT-26DB9BD,
LT-26DC9BH, LT-26ED91U
COPYRIGHT © 2008 Victor Company of Japan, Limited
No.YA605: LT-19DA9/19DB9 series
No.YA607: LT-32DA9/32DB9/32DC9/32EP9U series
No.YA609: LT-26DE9 series
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
<MODEL LINEUP>
TABLE OF CONTENTS
COPYRIGHT © 2008 Victor Company of Japan, Limited
No.YA606: LT-26DA9/26DB9/32DC9/26ED91U series
No.YA608: LT-42DA9/42DB9 series
No.YA610: LT-32DE9 series
No.YA606<Rev.002>
2008/8
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Table of Contents
Related Manuals for JVC LT-26DA9BU
Summarization of Contents
Safety Precautions
General Safety Precautions
Essential safety guidelines for product design and service.
Installation Guidelines
Heat Dissipation
Ensuring proper ventilation to prevent overheating and automatic shutdown.
Handling Precautions
Guidance on safely removing the unit from packaging.
Installation Requirements
Maintaining minimum distances and securing the unit to prevent tipping.
LCD Panel Handling and Care
Transportation Precautions
Guidelines for safely transporting the LCD panel, avoiding vibration and impact.
Optical Filter Care
Instructions on cleaning and avoiding damage to the optical filter.
Exterior Part Replacement Precautions
Advice on handling the LCD panel during exterior part replacement.
Specific Service Instructions
Product Features
Overview of key features including digital tuner, HDMI, and sound modes.
Model Difference List
Table detailing differences in specifications across various models.
Connector Information
SCART Connector (EXT-1/EXT-2) Pinout
Detailed pin assignment and signal designation for SCART connectors.
Technical Specifications
LCD Panel Specifications
Detailed technical specs of the LCD panel, including dimensions, resolution, and backlight.
Pixel Fault Definitions
Explains different types of pixel faults: bright, dark, and flicker.
Disassembly Procedures
Disassembly Precautions
Safety guidelines and preparation steps before disassembling the unit.
Disassembly Procedure
Step-by-step instructions for disassembling various parts of the TV.
Service Procedures
Memory IC Replacement
Procedure for replacing the memory IC, including initial settings and factory mode verification.
Factory Mode Setting
Details on entering and navigating the factory mode for setting adjustments.
Factory Settings
Factory Shipment Settings
Default settings for button operation, remote control, and APS modes.
Component Replacement Guide
Chip Component Replacement
Cautions, tools, and steps for safely removing and installing chip components.
Adjustment Procedures
Preparation and Instruments
Steps for preparation, required instruments, and preset settings before adjustment.
Factory Mode Operations
How to enter, exit, and change values in the factory mode.
Factory Mode Setting Details
Changing and Saving Values
How to change and store setting values within the factory mode.
Factory Mode Keys
Location of keys on the remote control for factory mode access.
Setting Items in Factory Mode
Detailed list of adjustable parameters for Video Setup across different inputs.
Specific Adjustments
Video Circuit White Balance
Procedure for adjusting white balance in the video circuit using factory mode settings.
Troubleshooting Information
Manual Scope
Note stating that troubleshooting is not covered in this service manual.
Parts List and Abbreviations
Component Abbreviations
Abbreviations and definitions for resistors, capacitors, and their tolerances.
Exploded View Parts List
Exploded View Parts
List of physical parts with reference numbers and model applicability.
Exploded View Diagram
Component Placement Diagram
Visual diagram showing the physical layout and assembly of TV components.
Printed Wiring Board Parts List [LT-26DA9BJ, LT-26DA9BU]
MAIN PWB ASS'Y (HU-71200009)
Part numbers and descriptions for the Main PWB Assembly.
MPEG PWB ASS'Y (HU-71200005)
Part numbers and descriptions for the MPEG PWB Assembly.
IR PWB ASS'Y (HU-72200001)
Part numbers and descriptions for the IR PWB Assembly.
KEY PWB ASS'Y (HU-72200002)
Part numbers and descriptions for the Key PWB Assembly.
Printed Wiring Board Parts List [LT-26DB9BD]
MAIN PWB ASS'Y (HU-71200009)
Part numbers and descriptions for the Main PWB Assembly.
MPEG PWB ASS'Y (HU-71200006)
Part numbers and descriptions for the MPEG PWB Assembly.
IR PWB ASS'Y (HU-72200001)
Part numbers and descriptions for the IR PWB Assembly.
KEY PWB ASS'Y (HU-72200002)
Part numbers and descriptions for the Key PWB Assembly.
Printed Wiring Board Parts List [LT-26DA9BN, LT-26ED91U]
MAIN PWB ASS'Y (HU-71200026)
Part numbers and descriptions for the Main PWB Assembly.
MPEG PWB ASS'Y (HU-71200005)
Part numbers and descriptions for the MPEG PWB Assembly.
IR PWB ASS'Y (HU-72200001)
Part numbers and descriptions for the IR PWB Assembly.
KEY PWB ASS'Y (HU-72200002)
Part numbers and descriptions for the Key PWB Assembly.
Printed Wiring Board Parts List [LT-26DC9BH]
MAIN PWB ASS'Y (HU-71200026)
Part numbers and descriptions for the Main PWB Assembly.
MPEG PWB ASS'Y (HU-71200012)
Part numbers and descriptions for the MPEG PWB Assembly.
IR PWB ASS'Y (HU-72200001)
Part numbers and descriptions for the IR PWB Assembly.
KEY PWB ASS'Y (HU-72200002)
Part numbers and descriptions for the Key PWB Assembly.
Product Packing Information
Packing Parts List
List of components included in the product packaging for safe transport.
Schematic Diagrams Overview
Model Identification
Identifies the specific TV models covered by these schematic diagrams.
Standard Circuit Diagram Guide
Using Circuit Diagrams
Notes on safety, voltage/waveform values, part symbols, and indications used in diagrams.
Repair Service Notes
Important considerations for repair service, especially regarding grounding and circuit changes.
Semiconductor Pinout Diagrams
Transistor Diagrams
Visual representations of transistor pinouts and views.
IC Diagrams
Visual representations of IC pinouts and views.
Chip IC Diagrams
Visual representations of chip IC pinouts and views.
Wiring Diagram Overview
Power and Control Unit Connections
Diagram showing connections between Power Unit, LCD Panels, and Key/IR PWBs.
Main and MPEG PWB Connections
Diagram illustrating interconnections between Main PWB, MPEG PWB, and Tuners.
System Block Diagram
System Functional Blocks
High-level overview of system components and their interconnections.
Main PWB Circuit Diagrams
Analog Tuner Circuit
Detailed circuit diagram for the Analog Tuner section of the Main PWB.
VCTP Power Circuit
Detailed circuit diagram for the VCTP Power supply on the Main PWB.
VCTP Reset & GPIO Circuit
Detailed circuit diagram for VCTP Reset and GPIO functions on the Main PWB.
VCTP A/V Input Circuit
Detailed circuit diagram for VCTP Analog/Video inputs on the Main PWB.
Scart Video Amplifier Circuit
Detailed circuit diagram for the Scart Video Amplifier on the Main PWB.
Scart Switch Circuit
Detailed circuit diagram for Scart signal switching on the Main PWB.
Scart 1 Input Circuit
Detailed circuit diagram for the Scart 1 input signals on the Main PWB.
Scart 2 Input Circuit
Detailed circuit diagram for the Scart 2 input signals on the Main PWB.
VGA Input & SPDIF Circuit
Detailed circuit diagram for VGA input and SPDIF output on the Main PWB.
Component Input & Signal Switch Circuit
Detailed circuit diagram for Component input and signal switching on the Main PWB.
HDMI Input 1 & 2 Circuit
Detailed circuit diagram for HDMI inputs 1 and 2 on the Main PWB.
HDMI Input 3 Circuit
Detailed circuit diagram for the HDMI Input 3 interface on the Main PWB.
HDMI Receiver (MST3380) Circuit
Detailed circuit diagram for the HDMI Receiver IC (MST3380) on the Main PWB.
HDMI Audio DAC Circuit
Detailed circuit diagram for the HDMI Audio Digital-to-Analog Converter on the Main PWB.
Audio Amplifier & Headphone Amplifier Circuit
Detailed circuit diagram for the audio and headphone amplifiers on the Main PWB.
LVDS Connector Circuit
Detailed circuit diagram related to the LVDS connector on the Main PWB.
RS232 Interface Circuit
Detailed circuit diagram for the RS232 communication interface on the Main PWB.
Power & Interface Connectors Circuit
Detailed circuit diagram for power and interface connectors on the Main PWB.
Tuner Docking Connectors Circuit
Detailed circuit diagram for tuner docking connectors on the Main PWB.
Regulator Circuits
Detailed circuit diagram for voltage regulator circuits on the Main PWB.
Microcontroller (ATmega324) Circuit
Detailed circuit diagram for the microcontroller (ATmega324) on the Main PWB.
Side Jack Circuit
Detailed circuit diagram for the side jack connections on the Main PWB.
MPEG PWB Circuit Diagrams
Terrestrial Tuner Circuit
Detailed circuit diagram for the Terrestrial Tuner on the MPEG PWB.
Digital Satellite Tuner Circuit
Detailed circuit diagram for the Digital Satellite Tuner on the MPEG PWB.
CI2000/CI2002 Interface Circuit
Detailed circuit diagram for the CI slot interface (CI2000/CI2002) on the MPEG PWB.
CI SLOT1 Interface Circuit
Detailed circuit diagram for the CI Slot 1 interface on the MPEG PWB.
TS Switch Circuit
Detailed circuit diagram for the Transport Stream (TS) switch on the MPEG PWB.
Demodulator (TDA10048) Circuit
Detailed circuit diagram for the Demodulator IC (TDA10048) on the MPEG PWB.
LNB Power Supply Circuit
Detailed circuit diagram for the LNB power supply on the MPEG PWB.
STI5518 Decoupling Capacitors
Decoupling capacitor configurations for the STI5518 IC on the MPEG PWB.
STI5518 BBQC Interface Circuit
Detailed circuit diagram for the BBQC interface of the STI5518 IC on the MPEG PWB.
STI5518 Reset and Clock Circuit
Detailed circuit diagram for the reset and clock signals related to the STI5518 IC on the MPEG PWB.
Flash Memory and EEPROM Circuit
Detailed circuit diagram for Flash memory and EEPROM on the MPEG PWB.
SDRAM Circuit (EMI & SMI)
Detailed circuit diagram for SDRAM operation, including EMI and SMI considerations, on the MPEG PWB.
Video Amplifier Circuit
Detailed circuit diagram for the video amplifier stages on the MPEG PWB.
Smart Card Interface Circuit
Detailed circuit diagram for the Smart Card VCC detector and connector on the MPEG PWB.
ROM and JTAG Connector Circuit
Detailed circuit diagram for ROM and JTAG connector interfaces on the MPEG PWB.
Audio DAC Circuit
Detailed circuit diagram for the Audio Digital-to-Analog Converter on the MPEG PWB.
Regulator Circuits
Detailed circuit diagram for voltage regulator circuits on the MPEG PWB.
Interface Connector Circuit
Detailed circuit diagram for the interface connectors on the MPEG PWB.
IR PWB Circuit Diagram
Remote Control Sensor Circuit
Circuit diagram for the IR receiver and remote control sensor.
Key PWB Circuit Diagram
ADC Input Values
Table showing ADC input values for various key presses and states.
Pattern Diagrams
Main PWB Pattern (Solder Side)
Layout of the Main PWB traces and components on the solder side.
Main PWB Pattern (Parts Side)
Layout of the Main PWB traces and components on the parts side.
MPEG PWB Pattern
Solder Side Layout
Layout of the MPEG PWB traces and components on the solder side.
Parts Side Layout
Layout of the MPEG PWB traces and components on the parts side.
PWB Patterns
IR and Key PWB Patterns
Layout diagrams for IR and Key PWB solder and parts sides.
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