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LED TV
SERVICE MANUAL
CHASSIS : LB41V
MODEL : 55UB850T
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL68084503 (1402-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
55UB850Y
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
55UB850T-TA
55UB850Y-TA
Printed in Korea
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Table of Contents
Related Manuals for LG 55UB850T-TA
Summarization of Contents
Safety Precautions
General Safety Guidelines
Covers essential safety notices, transformer usage, leakage current checks, and precautions.
Servicing Precautions
General Servicing Precautions and Guidelines
Outlines procedures for component handling, static protection, and soldering during service.
Specifications
Model and System Specifications
Details application range, testing requirements, test methods, and general model specifications.
Input and 3D Mode Specifications
Details specifications for various input formats, including HDMI, PC, and 3D modes.
Adjustment Instruction
Key Adjustment Procedures
Covers application range, designation, and procedures for automatic and specific adjustments.
LAN Inspection and Serial Number Download
Details LAN port inspection procedures and serial number download methods.
Block Diagram
External Connections Overview
Illustrates the external connectivity and signal flow of the TV system.
Exploded View
Component Identification and Layout
Provides a visual representation of the TV's internal components and their physical placement.
Power Supply Circuits
DC-DC Converter and Voltage Regulation
Details DC-DC converters and voltage regulation for UHD Power, eMMC, and core system voltages.
Renesas MICOM Microcontroller
MICOM Model and Option Settings
Describes the configuration options for the MICOM model based on selected settings.
CI Block (Common Interface)
B-CAS Smart Card Interface Details
Details the interface and circuitry for the B-CAS smart card.
Audio and Video Connectors
Connector Pinout Diagrams
Illustrates the pinout for SPDIF, Component, and CVBS connectors.
URSA9 Interface Circuits
LVDS and HDMI Interface Connections
Shows LVDS and HDMI interface connections for the URSA9 chip.
MICOM Power Management
GP4 High/MID Power Sequence
Details the power sequence for GP4 High/MID modes, including LED control.
USB Interface Circuits
USB3.0 Redriver and Port Configurations
Details USB3.0 redriver IC and port configurations for USB 1, 2, and 3.
Ethernet Interface
Ethernet Connector and PHY Circuitry
Illustrates the Ethernet connector, LAN jack, and PHY IC connections.
Ethernet PHY Control
Wake-on-LAN (WOL) Power Enable
Explains the control mechanism for Wake-on-LAN (WOL) power enabling via Ethernet PHY.
SCART Audio Amplifier
SCART Audio Processing Circuitry
Details the audio amplifier circuit for SCART audio processing.
Headphone Amplifier
Headphone Audio Output Circuit
Details the headphone amplifier circuit for audio output.
Smart Card Interface
B-CAS Card Slot Connection
Illustrates the connection and circuitry for the B-CAS smart card interface.
Tuner Interface and Options
Global Tuner Type and Country Options
Lists tuner type options and country-specific configurations.
Tuner Demodulator Circuits
Demodulator IC Connections and Interfaces
Shows connections for tuner demodulator ICs and related I2C/RF switch interfaces.
RS-232C Control Interface
RS-232C Communication Circuitry
Details the circuit diagram for RS-232C communication interface.
DVB-S2 LNB Power Circuit
LNB Power and Surge Protection
Illustrates the power supply and surge protection for the LNB.
eMMC Interface and Memory
eMMC Memory Chip Connections
Details connections for eMMC memory chips (Toshiba, Hynix, Samsung).
Debugging and Configuration Interfaces
SPI, I2C, JTAG, and Flash Memory Connections
Shows connections for SPI, I2C, JTAG, and serial flash for debugging and configuration.
DDR Memory Modules
DDR Memory Chip Pinouts and Connections
Details pinouts and connections for DDR memory modules (Hynix, Samsung).
URSA9 Power Supply Circuits
Voltage Regulators and Bypass Capacitors
Details voltage regulators and bypass capacitors for URSA9 power supply.
URSA9 Chip Interfaces
LVDS and HDMI Interface Pinouts
Illustrates URSA9 pinouts for LVDS and HDMI interfaces.
Display Panel Interface
Vx1 Output Wafer Connections
Details the connections to the display panel via Vx1 output wafer.
URSA9 Configuration and SPI Flash
SPI Flash and Debugging Interface Details
Details SPI flash connections and debugging interfaces for URSA9.
URSA9 Pinout Details
Power and Ground Pin Assignments
Lists power and ground pin assignments for the URSA9 chip.
URSA9 and T-con Power Management
Voltage Regulator Circuits for URSA9 and T-con
Details voltage regulator circuits for URSA9 core, DDR, and T-con power.
Speaker Amplifier Circuits
Audio Amplifier IC and Connections
Details the audio amplifier IC (NTP7514) and its connections for speaker output.
Audio Amplifier Options
Woofer and Height Amplifier Configuration
Outlines configuration options for Woofer and Height amplifier based on model.
Main PCB Component Identification
Key Component Locations on Main PCB
Identifies major components on the Main PCB like processors, memory, and switches.
Sub PCB Interconnection Diagram
PCB Layout and Interconnections
Illustrates the layout and interconnection of sub PCBs like PSU, T-CON, and Key/BT/Wifi modules.
Standard Repair Process - Video Errors
Troubleshooting No Video/Audio Issues
Flowcharts for diagnosing no video/audio issues, including power board checks.
Picture and Color Fault Diagnosis
Guides for fixing picture issues like freezing, color errors, bars, and spots.
Standard Repair Process - Power Errors
Troubleshooting No Power Issues
Flowchart for diagnosing and resolving the "No Power" error symptom.
Power Off Mode Troubleshooting
Details troubleshooting for power off issues like auto off or unknown status.
Standard Repair Process - Audio Errors
Troubleshooting No Audio/Normal Video
Guides on checking speaker output, power board voltage, and disconnection.
Standard Repair Process - Function Errors
Remote Control and MR13 Operation Checks
Troubleshooting steps for remote control, MR13 magic remote, Wi-Fi, and camera operations.
Wi-Fi, Camera, and External Device Recognition
Guides for diagnosing Wi-Fi, camera, and external device recognition issues.
Standard Repair Process - Other Issues
Noise and Exterior Defect Resolution
Covers diagnosis for circuit/mechanical noise and resolution for exterior defects.
Video Error Troubleshooting - No Video/Normal Audio
Checking LCD Backlight
Provides a visual guide on how to check the LCD backlight for no video/normal audio.
Video Error Troubleshooting - White Balance
White Balance Adjustment Procedure
Explains how to check and adjust white balance settings using the ADJ button and menu.
Video Error Troubleshooting - Tuner Signal
Tuner Signal Strength and Quality Check
Details how to check tuner signal strength and quality via Quick Settings and Manual Tuning.
Video Error Troubleshooting - Version Check
Checking TV Version via IN START Menu
Guides on checking TV version, serial number, and system information via IN START.
Video Error Troubleshooting - Tuner Part
Tuner Component Location and Check
Shows the location of tuner components and basic checking methods.
Video Error Troubleshooting - Connection Diagram
LCD TV External Input Connection Diagram
Illustrates the connection diagram for the LCD TV, focusing on external input paths.
Video Error Troubleshooting - Link Cable
LVDS Link Cable Reconnection Check
Details how to check and ensure proper reconnection of the LVDS link cable.
Video Error Troubleshooting - Test Patterns
Using ADJ Key for Test Patterns
Explains how to use the ADJ Key to view test patterns for diagnosing display issues.
Appendix: Main Board Exchange
Visual Defects for Main Board Replacement
Shows visual examples of main board defects like solder issues and broken CNTs.
Appendix: Main Board Exchange
Visual Defects for Main Board Replacement
Displays visual examples of main board defects including power section issues and abnormal display.
Appendix: Power Board (PSU) Exchange
Visual Symptoms of PSU Failure
Illustrates visual symptoms of power board failures like no light or dim light.
Appendix: Module Exchange
Visual Defects Requiring Module Exchange
Shows visual examples of panel defects like mura, light leakage, and press damage.
Appendix: Module Exchange
Visual Defects Requiring Module Exchange
Displays visual examples of module defects like blocks and lines needing replacement.
Power Error Troubleshooting - Front Power Indicator
Checking Front Power Indicator and Joystick Functions
Guides on checking the front power indicator LED and joystick button functions.
Power Error Troubleshooting - Voltage Checks
Power Board Voltage and ST-BY Check
Details checking power board output voltages and ST-BY status.
Power Error Troubleshooting - Power Off Modes
Checking Power Off Mode Status
Explains how to check and interpret power off modes in the IN START menu.
Audio Error Troubleshooting - No Audio/Normal Video
Checking Sound Output Settings
Guides on checking sound output settings in the menu, including TV speaker selection.
Audio Error Troubleshooting - Voltage and Speaker Check
Verifying Audio Output and Speaker Connections
Details checking power board voltage and speaker connections for audio issues.
Function Error Troubleshooting - Remote Control
Remote Control Operation Check Procedure
Provides steps for checking remote control operation, including IR cable and 3.5V checks.
Function Error Troubleshooting - Motion Remote/Wi-Fi
Motion Remote and Wi-Fi Connectivity Check
Guides on checking motion remote and Wi-Fi connectivity, including cable and voltage checks.
Function Error Troubleshooting - Tool Options
Changing Tool Options via USB Memory
Explains how to change tool options using USB memory and password entry.
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