The LG 42LD550-UB is a 42-inch LCD HDTV with 1080p Full HD resolution, built-in digital/analog tuner, multiple connectivity options including HDMI, USB, component video, composite video, PC input, and Ethernet port. Features include LED backlighting, Smart TV capabilities, built-in speakers, remote control, energy saving modes, picture/audio adjustments, and various picture enhancement technologies. Powered by 120V AC, 60Hz. Below are key sections for parts identification, specifications, installation, operation, and maintenance.
Main components: LCD panel with LED backlight, main board, power supply board, T-con board, speakers, remote control, stand assembly, wall mount interface.
| Component | Part Number | Description |
|---|---|---|
| Main Board | EAX65429701 | Central processing unit with input/output ports |
| Power Supply Board | EAY62836602 | AC/DC power conversion and distribution |
| T-Con Board | 6870C-0594A | Timing controller for LCD panel |
| LCD Panel | LC420EUN | 42-inch 1080p LCD display module |
| LED Backlight | LG42-ELED01 | LED light strips for panel illumination |
| Speakers | SPK-42LD550 | 10W x 2 stereo speaker system |
| Remote Control | AKB72915207 | Infrared remote with Smart TV functions |
| Stand Assembly | STAND-42LD55 | Tabletop stand with tilt adjustment |
| Wall Mount Kit | VESA400 | VESA 400x400mm wall mount compatible |
| Power Cable | PWR-CBL-3P | 3-prong AC power cord |
Ensure proper handling and placement for optimal performance and safety.
WARNING! TV is heavy; use two people for lifting and installation. Ensure wall mount is securely attached to wall studs.
Front Panel Controls: Power button, Menu button, Channel up/down, Volume up/down, Input selection.
On-Screen Display: Access via Menu button for Picture, Sound, Channel, Time, Lock, Option, Support settings.
Picture Settings: Picture Mode, Backlight, Contrast, Brightness, Sharpness, Color, Tint, Color Temperature, Advanced Controls.
Sound Settings: Sound Mode, Balance, Bass, Treble, Auto Volume, Clear Voice, Sound Effect.
Special Features: Energy Saving, Intelligent Sensor, Quick Start, Hotel Mode, Child Lock.
| Port | Location | Function |
|---|---|---|
| HDMI 1/2/3 | Side/Back | Digital audio/video input (HDCP 1.3) |
| Component Video | Back | YPbPr component video input |
| Composite Video | Back | CVBS video input |
| PC Input | Back | VGA 15-pin D-sub connector |
| PC Audio | Back | 3.5mm stereo audio input |
| USB 2.0 | Side | Media playback and service |
| Ethernet | Back | RJ-45 LAN connection |
| RF Input | Back | Coaxial antenna/cable input |
| Digital Audio Out | Back | Optical audio output |
| Headphone | Side | 3.5mm stereo headphone jack |
Model AKB72915207 - Infrared remote control with standard LG button layout.
| Button | Function | Replacement Part |
|---|---|---|
| Power | Turns TV on/off | BTN-PWR-RC |
| Number Pad | Direct channel selection | PAD-NUM-RC |
| Volume Controls | Adjusts audio level | BTN-VOL-RC |
| Channel Controls | Channel up/down | BTN-CH-RC |
| Menu | Accesses OSD menu | BTN-MENU-RC |
| Input | Selects input source | BTN-INPUT-RC |
| Navigation | Directional controls | PAD-NAV-RC |
| Smart Button | Accesses Smart TV features | BTN-SMART-RC |
| Color Buttons | Red, Green, Yellow, Blue | BTN-COLOR-RC |
| Battery Cover | Holds 2xAA batteries | COVER-BATT-RC |
VESA Mount Compatibility: 400mm x 400mm hole pattern
CAUTION! Use only LG-approved wall mounts. Improper mounting can cause TV to fall resulting in injury or damage.
Power Supply Unit: Switching mode power supply with active PFC
WARNING! Disconnect power before servicing. High voltages present even when powered off.
| Part Description | Part Number | Availability |
|---|---|---|
| Main Board Assembly | EAX65429701 | Limited |
| Power Supply Board | EAY62836602 | Available |
| T-Con Board | 6870C-0594A | Available |
| LCD Panel Complete | LC420EUN-SAF1 | Discontinued |
| LED Backlight Strips | LG42-ELED01 | Available |
| Speaker Set | SPK-42LD550 | Available |
| Remote Control | AKB72915207 | Available |
| Stand Assembly | STAND-42LD55 | Limited |
| Button Board | EBT63309301 | Available |
| IR Sensor Board | EAY62836603 | Available |
Authorized service centers and technical support contacts.
NOTE: Attempting self-repair may void warranty. Contact authorized service for repairs.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No power | Power cord, outlet, power board | Check power connection; test outlet; inspect fuse on power board |
| No picture/sound | Main board, T-con board | Check main board voltages; inspect T-con board connections |
| Backlight issues | LED strips, power supply | Test LED backlight; check +24V supply; inspect inverter section |
| No remote function | Batteries, IR sensor | Replace batteries; check IR sensor board; ensure line of sight |
| HDMI no signal | Cable, input selection | Verify HDMI cable; select correct input; try different HDMI port |
| Sound distortion | Speakers, audio board | Test speakers individually; check audio amplifier IC |
| Image artifacts | T-con board, LVDS cable | Reseat LVDS cables; test T-con board; check panel connections |
| Overheating | Ventilation, environment | Ensure proper ventilation; clean air vents; check ambient temperature |
Factory Reset: Menu > Option > Reset to Initial Settings (will erase all custom settings)
Service Hotline: 1-800-243-0000; www.lg.com/us/support