Disassembly Guide
Required Tools:
- Torx screwdriver set (T10-T25)
- Phillips screwdrivers (#1, #2)
- Flathead screwdriver
- Nut drivers (8mm, 10mm)
- Multimeter
- Panel removal tools
Step-by-Step Disassembly
- Power Disconnection: Unplug the washing machine from electrical outlet and turn off water supply valves.
- Top Panel Removal: Remove rear screws and slide top panel backward to release from front panel clips.
- Control Panel Access: Remove screws securing control panel and carefully disconnect wiring harnesses.
- Front Panel Removal: Remove lower kick panel, then detach front panel by releasing clips and removing mounting screws.
- Door Assembly Access: Remove door boot clamp and carefully detach door seal from front panel.
- Drum Access: Remove counterweight, drive belt (if applicable), and front support ring to access drum assembly.
- Motor Removal: Disconnect motor wiring and remove mounting bolts to detach motor from drum assembly.
Component Specifications
| Main Control Board | 6871ER2004A |
| Direct Drive Motor | MDS40213402 |
| Drain Pump | 4681EA2001T |
| Water Inlet Valve | 3820ER1012B |
| Door Lock Assembly | 5220ER1003G |
| Heater Element | MDS35333402 |
| Temperature Sensor | MDS30294401 |
| Pressure Switch | MDS30315401 |
| Shock Absorbers | MDS40246402 (Set of 4) |
| Springs | MDS40247401 (Set of 4) |
| Door Seal | MDS40245401 |
| Drum Spider | MDS40244401 |
Technical Specifications
- Motor Resistance: 10-15Ω at 20°C
- Heater Resistance: 25-35Ω at 20°C
- Pressure Switch Range: 0-200 mBar
- Temperature Sensor: NTC 10kΩ
- Main Voltage: 220-240V AC 50Hz
For genuine parts ordering, contact LG Parts Department at 1-800-243-0000 or visit LG Service Portal
Diagnostic Procedures
| Error Code | Description | Diagnostic Procedure |
|---|---|---|
| PE | Pressure Sensor Error | Check pressure hose for blockage, test pressure sensor continuity |
| TE | Temperature Sensor Error | Measure NTC resistance, check wiring harness for damage |
| HE | Heater Error | Test heater element resistance, check thermal fuse |
| LE | Motor Error | Check motor hall sensors, test motor phase resistance |
| FE | Communication Error | Verify main board connections, test communication lines |
| DE | Door Lock Error | Test door lock mechanism, check microswitch operation |
Advanced Diagnostics
Motor Testing
Procedure: Disconnect motor connector. Measure resistance between phases (U-V, V-W, W-U). Should be 10-15Ω with balanced readings. Check hall sensor signals during manual drum rotation.
Control Board Diagnostics
Procedure: Check all power supply voltages (+5V, +12V, +310V). Verify communication with display board. Test all sensor inputs and actuator outputs using service mode.
Water System Testing
Procedure: Test water valve coils (2-4kΩ). Check pressure switch operation. Verify pump motor operation and impeller rotation. Inspect for leaks and blockages.
Repair Instructions
Motor Replacement
Remove rear panel, disconnect wiring, remove mounting bolts. Install new motor with proper alignment. Torque bolts to 25-30 Nm.
Drum Bearing Service
Complete disassembly required. Remove drum spider, press out old bearings, install new bearings with proper tools. Apply waterproof grease.
Control Board Replacement
Document wiring connections, remove old board, install new board. Update software if required. Perform calibration procedures.
Shock Absorber Replacement
Remove front panel, compress and remove old shocks. Install new shocks with proper orientation. Check drum alignment.
Heater Element Replacement
Access through rear panel. Disconnect power, remove mounting nuts. Install new element with new gasket. Test for leaks.
Door Seal Replacement
Remove front panel, release tension ring. Install new seal with proper alignment. Ensure no twists or gaps in installation.
Calibration Procedures
- Motor Position Calibration: Enter service mode, select motor calibration. Machine will automatically set motor reference position.
- Pressure Sensor Calibration: Ensure empty drum, enter calibration mode. System will set zero pressure reference.
- Imbalance Detection Calibration: Run test cycle with calibration weight. System learns normal vibration patterns.
- Water Level Calibration: Verify pressure system integrity. Calibrate for accurate water level detection.
Service Downloads
Service Documentation
Full Service Manual
Complete technical documentation
Wiring Diagrams
Electrical schematics and layouts
Parts Catalog
Exploded views and part numbers
Software Updates
Firmware and calibration files
Technical Bulletins
Service Bulletin #245
Motor Control Board Update
Service Bulletin #312
Enhanced Diagnostic Procedures
Service Bulletin #428
Common Fault Analysis
Service Bulletin #519
Software Update Guide