LG 47LE5400 Service Manual

The LG 47LE5400 is a 47-inch LED TV featuring Full HD 1080p resolution, LED Plus technology, Smart TV capabilities with NetCast, built-in Wi-Fi, multiple HDMI inputs, USB connectivity, Clear Voice II technology, Intelligent Sensor for automatic picture adjustment, and Energy Star compliance. Below are key sections for technical specifications, disassembly instructions, troubleshooting, circuit diagrams, and service procedures.

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

Technical Specifications

Key components: LED panel with Smart TV functionality, main board, power supply board, T-CON board, LED backlight system.

SpecificationDetails
Screen Size47 inches LED
Resolution1920 x 1080 (Full HD)
TV SystemATSC/NTSC/QAM
Smart TVNetCast with built-in Wi-Fi
Inputs4 x HDMI, 3 x USB, Component, Composite, RF
Sound Output10W + 10W
Power Consumption85W (typical)
Standby Power< 0.5W
Power Supply100-240V AC, 50/60Hz
DimensionsWith Stand: 1120 x 740 x 245 mm

Safety Precautions

Before servicing, disconnect AC power and discharge capacitors.

  1. Use insulated tools and wear ESD protection.
  2. Disconnect AC power before replacing any components.
  3. Handle LED panel with care to avoid damage.
  4. Ensure proper grounding of test equipment.

WARNING! High voltages present in power supply and inverter sections. Capacitors may retain charge after power disconnect.

Disassembly Instructions

Step-by-step procedure for accessing internal components.

  1. Remove stand: Lay TV face down on soft surface, remove screws securing stand.
  2. Remove rear cover: Remove all screws from rear cover, carefully separate cover from chassis.
  3. Access main board: Remove metal shield covering main board.
  4. Access power supply: Remove screws securing power supply board.
  5. Access LED backlight: Remove bezel and diffuser panels carefully.

CAUTION! Handle LCD panel with extreme care to avoid cracking or damaging.

Main Board Replacement

Procedure for replacing EAX65433601 main board.

  1. Disconnect all cables from main board.
  2. Remove mounting screws securing main board.
  3. Carefully lift main board from chassis.
  4. Install new main board and secure with screws.
  5. Reconnect all cables according to labeling.
  6. Perform software update if required.

Note: Record original board settings before replacement.

Power Supply Board

EAX65433702 power supply board specifications and testing.

Testing Procedure: Check all output voltages with no load before proceeding.

LED Backlight System

LED backlight configuration and replacement procedure.

  1. System uses 4 LED strips with 12 LEDs per strip.
  2. LED voltage: 3.0-3.4V per LED
  3. Total backlight voltage: 180-200V DC
  4. Current: 120mA per string

LED Strip Replacement:

  1. Remove LCD panel carefully (requires two technicians)
  2. Remove diffuser sheets and light guides
  3. Replace faulty LED strips
  4. Reassemble in reverse order

Troubleshooting Flowcharts

Systematic approach to common problems.

SymptomCheckSolution
No PowerAC input, fuse, standby voltageReplace power board if no standby voltage
No BacklightLED voltage, backlight enableCheck LED driver circuit, replace LED strips
No PictureT-CON voltages, LVDS signalReplace T-CON board or main board
No SoundAudio output, speaker connectionsReplace main board or speakers
Wi-Fi Not WorkingWi-Fi module connectionReseat or replace Wi-Fi module

Circuit Diagrams

Reference schematics for major sections.

Note: Schematics show component values and test points for voltage measurements.

Software Update Procedures

Firmware update methods for LG 47LE5400.

  1. USB Update: Download firmware to USB drive, insert in TV USB port, follow on-screen instructions.
  2. Service Remote: Use service remote to enter service menu for forced update.
  3. Online Update: Through NetCast internet connection (requires working network).

WARNING! Do not interrupt power during firmware update.

Parts List

Replacement parts with manufacturer part numbers.

ComponentPart NumberDescription
Main BoardEAX65433601Main processing board
Power SupplyEAX65433702AC/DC power board
T-CON BoardEAX65433801Timing controller board
LED StripsEAX65433901LED backlight strips (set of 4)
Wi-Fi ModuleEAX65434001Wireless network module
Remote ControlAKB72915207Standard remote control

Error Codes

Common error codes and their meanings.

Error CodeDescriptionSolution
LE_001Main board communication errorReplace main board
LE_002Power supply faultCheck power board voltages
LE_003LED backlight failureCheck LED driver and strips
LE_004T-CON board errorReplace T-CON board
LE_005Temperature sensor errorCheck thermal sensors

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

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