LG 26LE5300 Service Manual

The LG 26LE5300 is a 26-inch LED TV with Full HD 1080p resolution, built-in digital tuner, multiple HDMI inputs, USB connectivity, Energy Star compliance, and advanced picture enhancement technologies. This service manual provides comprehensive technical information for repair and maintenance, including schematics, disassembly procedures, component specifications, and troubleshooting guidelines for qualified service technicians.

1. Product Overview 2. Technical Specifications 3. Disassembly Instructions 4. PCB Layouts 5. Schematic Diagrams 6. Component Locations 7. Test Points & Voltages 8. Error Codes 9. Firmware Update 10. Safety Precautions 11. Troubleshooting Guide

Product Overview

Main assemblies: LED panel, main board, power supply board, T-con board, LED backlight assembly, IR sensor board, and control buttons.

ComponentDescription
Main BoardModel EAX64409604 - processes video/audio signals
Power SupplyModel EAY62836601 - provides various DC voltages
T-Con BoardControls timing for LCD panel
LED BacklightEdge-lit LED array with driver circuit
IR BoardInfrared receiver for remote control
Control ButtonsPower, volume, channel, menu controls
Speakers2x 10W stereo speakers
Input PanelHDMI, USB, component, composite inputs
Stand AssemblySupports TV unit
Rear CoverProtects internal components

Technical Specifications

Disassembly Instructions

Follow these steps carefully to disassemble the unit for service.

  1. Remove stand: Lay TV face down on soft surface, remove 4 screws holding stand.
  2. Remove rear cover: Remove all visible screws from rear cover, carefully pry open with plastic tool.
  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 LED backlight: Remove bezel and LCD panel to access LED strips.

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

PCB Layouts

Detailed board layouts for main board, power supply, and T-con board.

BoardComponentLocation
Main BoardIC801 - Main ProcessorU801
Main BoardIC201 - MemoryU201
Main BoardIC501 - HDMI SwitchU501
Power SupplyIC901 - PWM ControllerU901
Power SupplyF901 - FuseF901
T-Con BoardIC1 - Timing ControllerU1
T-Con BoardF1 - FuseF1

Schematic Diagrams

Complete schematics for all major circuits including power supply, main board, and audio section.

  1. Power Supply Section: AC input, rectification, switching regulation, and DC output circuits.
  2. Main Board: Video processing, audio processing, tuner, and control circuits.
  3. LED Backlight: Driver circuit and LED string configuration.
  4. Audio Amplifier: Stereo amplifier circuit and speaker connections.
  5. T-Con Board: LVDS interface and timing control circuits.

Note: Refer to separate schematic diagrams PDF for detailed circuit analysis.

Component Locations

Key components and their physical locations on each board.

ComponentReferenceLocationDescription
Main ProcessorIC801Main BoardMediaTek MT5326
DDR MemoryIC201-204Main Board4x 512MB DDR3
Flash MemoryIC301Main Board4MB SPI Flash
Audio AmplifierIC701Main BoardTDA7266
Power MOSFETQ901Power SupplyK3568
OptocouplerPC901Power SupplyPC817
LED DriverIC1101Power SupplyOZ9902

Test Points & Voltages

Critical test points and expected voltage readings for troubleshooting.

Test PointLocationNormal VoltageDescription
TP+12VPower Supply12.0V ±5%Main 12V supply
TP+5VPower Supply5.0V ±5%Standby 5V
TP+3.3VMain Board3.3V ±5%Digital logic supply
TP+1.8VMain Board1.8V ±5%Core voltage
TP+24VPower Supply24V ±5%LED backlight supply
TP_VCOMT-Con Board6.5V ±10%VCOM voltage
TP_AVDDT-Con Board15.5V ±10%Analog supply

Error Codes

Diagnostic error codes and their meanings for service diagnosis.

Error CodeSymptomPossible Cause
E001No powerPower supply failure
E002No backlightLED driver or backlight failure
E003No videoMain board or T-con failure
E004No audioAudio circuit failure
E005No tunerTuner circuit failure
E006Memory errorDDR memory failure
E007USB errorUSB circuit failure

Firmware Update

Procedures for updating TV firmware via USB.

  1. Download latest firmware from LG service website.
  2. Extract files to root directory of USB drive (FAT32 format).
  3. Turn off TV and insert USB drive into service port.
  4. Press and hold Volume Down button on TV while turning on power.
  5. Release button when "Software Update" appears on screen.
  6. Wait for update to complete (do not interrupt power).
  7. TV will restart automatically when update is finished.

CAUTION! Do not interrupt power during firmware update to prevent permanent damage.

Safety Precautions

Important safety guidelines for service technicians.

WARNING! High voltage present in power supply and backlight circuits. Exercise extreme caution.

Troubleshooting Guide

SymptomPossible CauseCorrective Action
No powerPower supply failureCheck AC input, fuse F901, output voltages
No backlightLED driver failureCheck +24V supply, LED driver IC1101
No videoMain board/T-con failureCheck LVDS cable, T-con voltages, main board
No audioAudio circuit failureCheck audio IC701, speakers, audio inputs
Distorted pictureT-con or panel failureCheck T-con voltages, replace T-con board
Remote not workingIR sensor failureCheck IR sensor board, remote batteries
USB not recognizedUSB circuit failureCheck USB ports, main board USB circuit

Service Contact: LG Service Center 1-800-243-0000

Parts Ordering: www.lgservicenet.com

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