The LG D393 is a mobile device featuring advanced connectivity options, multimedia capabilities, and user-friendly interface. This service manual provides comprehensive technical information for service technicians, including disassembly procedures, troubleshooting guides, schematic diagrams, and replacement parts information. Below are key sections covering safety precautions, technical specifications, maintenance procedures, and repair instructions.
Key components: Mainboard, Display Assembly, Battery, Camera Modules, Connectivity Modules, and External Interfaces.
| Component | Description |
|---|---|
| Mainboard | Central processing unit with integrated memory and connectivity chips |
| Display Assembly | LCD touchscreen with digitizer and backlight system |
| Battery | Lithium-ion rechargeable battery pack |
| Rear Camera | Primary camera module with autofocus and flash |
| Front Camera | Secondary camera for video calls and selfies |
| Connectivity | Wi-Fi, Bluetooth, and cellular modules |
| Audio System | Speaker, microphone, and audio codec |
| Charging Port | USB-C connector for charging and data transfer |
| Buttons | Power, volume, and function buttons |
| Sensors | Accelerometer, proximity, light, and fingerprint sensors |
Before performing any service procedures, read and follow all safety instructions.
WARNING! High voltage components may retain charge even when powered off. Use appropriate safety equipment.
Step-by-step instructions for device disassembly.
CAUTION! Use proper tools to avoid damaging components and connectors.
Detailed diagram showing component positions on mainboard.
| Reference Designator | Component | Location |
|---|---|---|
| U1 | Main Processor | Center of mainboard |
| U2 | Memory Chip | Top right of processor |
| U3 | Power Management IC | Left side of mainboard |
| J1 | Display Connector | Top edge of mainboard |
| J2 | Battery Connector | Bottom left of mainboard |
| J3 | Charging Port | Bottom center of mainboard |
| J4 | Camera Connector | Top left of mainboard |
Schematic diagrams for mainboard and power circuits.
Note: Refer to detailed schematic PDF for complete circuit analysis.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No power | Battery, charging circuit | Check battery voltage; test charging port; replace power IC |
| No display | Display, flex cable, mainboard | Test display assembly; check flex connections; replace mainboard |
| No touch response | Digitizer, flex cable | Replace digitizer; check flex cable connection |
| Camera not working | Camera module, software | Test camera module; update software; check connections |
| No network | Antenna, RF components | Check antenna connections; test RF circuitry |
| Overheating | Battery, processor | Check battery condition; monitor processor temperature |
Authorized replacement parts with part numbers.
| Part Number | Description | Compatibility |
|---|---|---|
| LG-D393-MB | Mainboard Assembly | All D393 models |
| LG-D393-DISP | Display Assembly | D393 standard version |
| LG-D393-BATT | Battery Pack | All D393 variants |
| LG-D393-CAM-R | Rear Camera Module | D393 with 12MP camera |
| LG-D393-CAM-F | Front Camera Module | All D393 models |
| LG-D393-CHRG | Charging Port Assembly | D393 USB-C version |
Firmware update and software installation procedures.
WARNING! Use only official firmware to avoid device malfunction.
Post-repair testing and quality assurance.
LG D393 comes with standard 12-month manufacturer warranty. Service performed by unauthorized technicians may void warranty. Keep original purchase receipt for warranty claims. For warranty service, contact LG authorized service centers only.
Service Support: 1-800-243-0000; www.lg.com/support