LG 49UH6030 Repair Manual

The LG 49UH6030 is a 49-inch 4K Ultra HD LED TV with webOS smart platform, HDR Pro, Triple XD Engine, and built-in Wi-Fi. This repair manual covers disassembly procedures, component identification, troubleshooting guides, safety precautions, and replacement instructions for service technicians. Below are key sections for safety guidelines, disassembly steps, component specifications, diagnostic procedures, and replacement instructions.

1. Safety Precautions 2. Disassembly Procedures 3. Component Identification 4. Technical Specifications 5. Diagnostic Testing 6. Power Supply Repair 7. Main Board Replacement 8. LCD Panel Service 9. Backlight System 10. Reassembly Instructions 11. Troubleshooting Guide

Safety Precautions

Critical safety guidelines for service technicians working on the LG 49UH6030 television.

HazardPrecaution
Electrical ShockDisconnect power before servicing; discharge capacitors
High VoltageBacklight inverter produces lethal voltages; handle with care
ESD ProtectionUse anti-static wrist strap when handling circuit boards
LCD PanelHandle carefully to avoid cracking; use proper tools
Power SupplyIsolate AC input during testing; use isolation transformer
Heating ElementsAllow components to cool before handling
Sharp EdgesWear protective gloves during disassembly
Chemical ExposureUse proper ventilation when cleaning components

Disassembly Procedures

Step-by-step instructions for safely disassembling the LG 49UH6030 television.

  1. Remove stand: Lay TV face down on soft surface; unscrew stand mounting bolts.
  2. Remove rear cover: Remove all screws from rear panel; carefully separate cover from chassis.
  3. Disconnect cables: Label and disconnect all ribbon cables and connectors.
  4. Remove main board: Unscrew mounting points; carefully lift board from chassis.
  5. Remove power supply: Disconnect AC input and output cables; remove mounting screws.
  6. Access LCD panel: Remove bezel screws; carefully separate front bezel from panel.

WARNING! LCD panel is fragile; handle with extreme care to avoid damage.

Component Identification

Identification and location of major components within the LG 49UH6030.

ComponentLocationPart Number
Main BoardCenter rearEAY64927601
Power SupplyLeft sideEAY64927401
T-Con BoardTop center6870C-0594A
LED DriverRight sideEAX65479301
Wi-Fi ModuleRear upper left6841H-1489A
IR SensorBottom centerEAY63372902
SpeakersBottom left/rightEAY64927501

Technical Specifications

Diagnostic Testing

Procedures for testing and diagnosing common issues with the LG 49UH6030.

  1. Power supply test: Check DC output voltages (12V, 24V, 3.3V standby)
  2. Backlight test: Use LED tester to check LED strips for open circuits
  3. Main board test: Verify processor operation and memory functionality
  4. T-Con board test: Check LVDS signals and timing controller operation
  5. Input testing: Test HDMI, USB, and other input sources
  6. Software diagnostics: Access service menu for error codes and logs

Service Menu Access: Menu > Settings > Option > Service Menu (password 0413)

Power Supply Repair

Common power supply issues and repair procedures for EAY64927401 board.

SymptomComponentTest Procedure
No powerFuse F101Check continuity; replace if open
No standbyIC201Check 3.3V standby output
No 12V/24VQ301, Q302Test MOSFETs for shorts
Backlight flickerC407, C408Check capacitor ESR values
Intermittent powerThermal protectionCheck thermistors and cooling

Main Board Replacement

Procedure for replacing the main board (EAY64927601) in LG 49UH6030.

  1. Disconnect power and remove rear cover
  2. Label all connectors and ribbon cables
  3. Remove mounting screws securing main board
  4. Carefully disconnect all cables from main board
  5. Remove old board and install replacement
  6. Reconnect all cables in original positions
  7. Test functionality before reassembly

NOTE: Replacement boards may require firmware update for full compatibility.

LCD Panel Service

Handling and replacement procedures for the 49-inch LCD panel.

  1. Remove bezel and protective layers
  2. Disconnect LVDS cables from T-Con board
  3. Remove panel mounting brackets
  4. Carefully lift panel from chassis
  5. Install replacement panel in reverse order
  6. Ensure proper alignment and connection

CAUTION! LCD panels are extremely fragile; avoid pressure on screen surface.

Backlight System

LED backlight system service and replacement procedures.

ComponentTest ValueReplacement Part
LED Strips2.8-3.2V per LEDEAX65479201 (set of 6)
LED Driver50-200V outputEAX65479301
Diffuser SheetsVisual inspectionEAX65479401
Optical FilmNo scratchesEAX65479501

Backlight Test Mode: Service Menu > OLED > Aging > Pattern

Reassembly Instructions

Proper reassembly procedure to ensure optimal performance and safety.

  1. Verify all components are properly seated and connected
  2. Route cables away from heat sources and moving parts
  3. Install rear cover and secure all screws
  4. Reattach stand and ensure stability
  5. Perform final functional test
  6. Clean screen and exterior surfaces

Final Check: Test all inputs, audio, remote control, and smart features.

Troubleshooting Guide

SymptomPossible CauseCorrective Action
No powerPower supply failureCheck fuse, standby voltage, main components
No picture/soundMain board failureTest main board voltages and processor
Backlight issuesLED strips/driverTest LED strips and driver board output
Image artifactsT-Con board/LVDSCheck T-Con board and LVDS connections
No smart featuresWi-Fi moduleTest Wi-Fi module and connections
Audio problemsSpeaker/audio ICCheck speakers and audio processing IC

Factory Reset: Settings > General > Reset to Initial Settings

Technical Support: LG Service Center 1-800-243-0000

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