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LED TV
SERVICE MANUAL
CHASSIS : LD42B
MODEL : 50LB67**
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67985205 (1401-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
50LB67**-Z*
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea
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Table of Contents
Related Manuals for LG 50LB675V
Summarization of Contents
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
Crucial safety information for technicians when servicing the chassis, highlighting specific part replacements.
General Guidance
Provides general advice on electrical safety, isolation transformers, and handling fuses during servicing.
Leakage Current Hot Check
Details the procedure for measuring AC leakage current under hot conditions using specific equipment.
SERVICING PRECAUTIONS
General Servicing Precautions
Outlines essential precautions for general servicing tasks like unplugging power and handling components.
Electrostatically Sensitive (ES) Devices
Explains how to handle sensitive electronic components to prevent static damage.
General Soldering Guidelines
Provides best practices for soldering techniques, including tip temperature and solder type.
SPECIFICATION
1. Application range
Specifies the LED TV models and chassis this manual applies to.
2. Requirement for Test
Lists the environmental and power conditions for testing the TV receiver.
3. Test method
Outlines the test methods for performance, safety, and EMC specifications.
4. Model General Specification
Details general specifications for market, countries, and supported digital TV standards.
HDMI Input
6.1. DTV mode
Lists supported resolutions, frequencies, and pixel clocks for DTV HDMI input.
6.2. PC mode
Details supported resolutions, frequencies, and pixel clocks for PC HDMI input.
7. 3D Mode
7.1. HDMI 1.4b (3D supported mode automatically)
Lists HDMI 1.4b resolutions and their corresponding 3D input modes.
ADJUSTMENT INSTRUCTION
1. Application Range
Defines the scope of application for the adjustment instructions to LED TVs with LD42B chassis.
2. Designation
Provides general notes and conditions for performing adjustments, including temperature and voltage.
3. Automatic Adjustment
Details procedures for automatic adjustments like MAC address and key downloads.
3.2. LAN Inspection
Explains how to perform LAN inspection and check network connectivity.
3.4. Model name & Serial number Download
Describes the process for downloading model name and serial number via service remote.
3.5. CI+ Key checking method
Outlines the method for checking CI+ Key status and download via menu or RS232.
4. Manual Adjustment
4.1. EDID DATA
Details EDID data for both 3D and 2D modes, crucial for display compatibility.
4.2. White Balance Adjustment
Explains the objective, equipment, and methods for white balance adjustment.
4.3. Local Dimming Function Check
Provides steps to check the local dimming function on various LED models.
4.6. Wi-Fi Test
Outlines the steps to test Wi-Fi connection and network access.
4.7. LNB voltage and 22KHz tone check
Details the procedure for checking LNB voltage and 22KHz tone for DVB-S/S2 models.
7. GND and Internal Pressure check
Explains the method for checking ground and internal pressure integrity.
Standard Repair Process
A. Video error
Troubleshooting steps for video issues like no video, freezing, or color problems.
B. Power error
Troubleshooting steps for power-related issues such as no power or auto power off.
C. Audio error
Troubleshooting steps for audio issues like no audio or distorted sound.
D. General Function Problem
Troubleshooting for general function issues related to remote control and buttons.
D. Function error
Troubleshooting for external device recognition errors.
E. Noise
Guidance for identifying and resolving circuit or mechanical noise issues.
F. Exterior defect
Procedures for addressing exterior defects like module or cabinet damage.
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