LG 55LW5600 Service Manual

The LG 55LW5600 is a 55-inch LED TV with Full HD 1080p resolution, built-in digital tuner, Smart TV capabilities, multiple HDMI inputs, USB connectivity, built-in Wi-Fi, energy saving features, and advanced picture technologies including LED Plus and TruMotion. This service manual provides technical information for qualified service personnel including disassembly procedures, circuit diagrams, troubleshooting guides, and replacement parts information.

1. Product Overview 2. Technical Specifications 3. Disassembly Procedures 4. Circuit Diagrams 5. Main Board Replacement 6. Power Supply Board 7. LED Backlight System 8. Troubleshooting Flowcharts 9. Error Codes 10. Parts List 11. Safety Precautions

Product Overview

The LG 55LW5600 features a 55-inch LED display with Full HD 1080p resolution, Smart TV functionality, and multiple connectivity options.

ComponentDescription
Main BoardEAX61757801 - Processes all inputs and controls display functions
Power SupplyEAY62819301 - Provides power to all components
T-Con BoardEAX61757704 - Controls timing and data to LCD panel
LED DriverEAX61757601 - Controls LED backlight system
Wi-Fi ModuleIntegrated 802.11n wireless connectivity
IR SensorReceives remote control signals
Control ButtonsPower, Volume, Channel, Input, Menu
Speakers10W x 2 built-in speakers with Clear Voice II
Input PanelHDMI x 3, USB x 2, Component, Composite, RF
Stand AssemblySupports TV in upright position

Technical Specifications

Disassembly Procedures

Follow these steps carefully to disassemble the TV for service.

  1. Remove stand: Lay TV face down on soft surface, remove screws holding stand.
  2. Remove rear cover: Remove all screws from rear cover, carefully separate cover from chassis.
  3. Disconnect cables: Note cable positions before disconnecting main board, power supply, and T-con connections.
  4. Remove main board: Remove mounting screws and carefully lift board from chassis.
  5. Access power supply: Remove screws and disconnect all power connectors.
  6. LCD panel removal: Extreme care required - follow specific panel removal procedure.

WARNING! Always disconnect power before disassembly. Handle LCD panel with care to avoid damage.

Circuit Diagrams

Complete circuit diagrams for all major components.

DiagramDescriptionReference
Main BoardComplete schematic - EAX61757801Page 15-22
Power SupplyEAY62819301 power circuitPage 23-28
T-Con BoardEAX61757704 timing controlPage 29-32
LED DriverEAX61757601 backlight controlPage 33-35
Input PanelAll input/output connectionsPage 36-38
Control SystemIR sensor and button circuitsPage 39-40

Main Board Replacement

Procedure for replacing the main board (EAX61757801).

  1. Disconnect all cables and remove rear cover.
  2. Remove screws securing main board to chassis.
  3. Carefully disconnect all ribbon cables and connectors.
  4. Remove old main board and install replacement.
  5. Reconnect all cables in original positions.
  6. Test functionality before reassembling.

Note: Main board contains EEPROM with set data - may require reprogramming.

Power Supply Board

Troubleshooting and replacement of power supply board EAY62819301.

Common Issues: No power, intermittent power, backlight flashing, standby issues.

LED Backlight System

The 55LW5600 uses direct LED backlighting with local dimming capability.

  1. LED Strips: 6 strips with multiple LEDs per strip
  2. Driver Circuit: EAX61757601 controls brightness and dimming
  3. Testing: Use LED tester or measure voltage at LED connectors
  4. Replacement: Complete strip replacement recommended for failed LEDs
  5. Calibration: Backlight uniformity adjustment required after replacement

WARNING! High voltage present - discharge capacitors before servicing.

Troubleshooting Flowcharts

Systematic approach to common problems.

SymptomFirst CheckNext Steps
No PowerCheck AC input, standby voltageTest power supply outputs, check main board
No Picture/SoundCheck backlight, main voltagesTest main board, T-con board
No BacklightCheck LED driver voltagesTest LED strips, replace driver board
No SoundCheck speaker connectionsTest audio IC, main board audio section
No Smart TVCheck network connectionReset smart features, update software
Image ProblemsCheck T-con voltagesTest LVDS cables, replace T-con board

Error Codes

Diagnostic error codes and their meanings.

Error CodeDescriptionSolution
E1Main board communication errorCheck main board connections, replace if needed
E2Power supply errorCheck power supply voltages and connections
E3T-con board errorCheck T-con board and LVDS cables
E4LED backlight errorCheck LED driver and backlight strips
E5Panel errorCheck panel connections and voltages
E6Temperature sensor errorCheck thermal sensors and cooling

Parts List

Replacement parts for LG 55LW5600.

Part NumberDescriptionQty
EAX61757801Main Board Assembly1
EAY62819301Power Supply Board1
EAX61757704T-Con Board1
EAX61757601LED Driver Board1
6871Q-0583ALED Backlight Strip6
AGP73435801Remote Control1
6841V-0015FLCD Panel 55"1
EAX56021304Wi-Fi Module1
10-37230-01Stand Assembly1
EAX61757501Input Panel Board1

Safety Precautions

Critical safety information for service personnel.

WARNING! This manual is for qualified service personnel only. Incorrect service procedures can cause serious injury or damage.

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