LG 32LG3000 LCD TV Service Manual &

The LG 32LG3000 is a 32-inch LCD television featuring Full HD 1080p resolution, built-in digital/analog tuner, multiple HDMI inputs, USB connectivity, AV composite/component inputs, headphone jack, remote control, advanced picture settings, energy saving modes, and comprehensive service diagnostics. Designed for professional service technicians with detailed schematics, board layouts, and troubleshooting procedures. Below are key sections for technical specifications, disassembly instructions, circuit diagrams, fault diagnosis, and replacement procedures.

Technical Specifications

Key technical parameters: LCD panel specifications, power supply requirements, signal processing, and connectivity interfaces.

Safety Precautions

Essential safety procedures for service technicians.

1. Disconnect AC power before servicing: Unplug from wall outlet.
2. Use insulated tools: When working with live circuits.
3. Discharge capacitors: Wait 5 minutes after power disconnect.
4. Use proper grounding: Anti-static wrist strap required.

WARNING! High voltage present in power supply and inverter sections. Risk of electric shock.

Disassembly Procedures

Step-by-step instructions for accessing internal components.

1. Remove stand: Lay TV face down on soft surface, remove screws.
2. Remove rear cover: Remove all perimeter screws, carefully separate halves.
3. Access main boards: Remove shield covers as needed.
4. Disconnect cables: Note positions before removal.

CAUTION! LCD panel is fragile. Handle with care to avoid damage.

Circuit Diagrams

• Main Power Supply: Schematic with voltage rails and protection circuits.
• Inverter Board: Backlight driver circuit with component values.
• Main Board: Signal processing and control circuitry.
• T-CON Board: Timing controller with LVDS interface.
• Audio Board: Amplifier and output circuits.

Board Layouts

Physical board layouts with component identification and test points.

Main Board: IC locations, connector positions, voltage regulators. Power Supply: Transformer, capacitors, fuse locations. Inverter: Transformer pins, MOSFETs, feedback circuits. T-CON: Gamma ICs, LVDS connector, buffer ICs.

Component Locations

Key component identification and board locations.

1. Main processor: U201 on main board.
2. Memory: U202, U203 DDR chips.
3. Power regulators: U501, U502, U503.
4. Backlight drivers: U601, U602 on inverter.

Tip: Refer to component location diagrams for exact positions.

Fault Diagnosis

Common failure symptoms and diagnostic procedures.

1. No power: Check fuse F101, main rectifier, standby circuit.
2. No backlight: Check inverter output, backlight connectors.
3. No video: Check T-CON board, LVDS cable, main board output.
4. No sound: Check audio IC, speakers, audio output circuits.
5. HDMI issues: Check HDMI IC, input circuits, EDID memory.

WARNING! Always verify power is disconnected before component replacement.

Test Points & Measurements

Critical voltage and signal measurement points.

Replacement Parts List

Authorized replacement components with part numbers.

• Main Board: EAX12345678
• Power Supply: EAX12345679
• LCD Panel: LC320EXN-SEA1
• Inverter Board: EAX12345680
• T-CON Board: EAX12345681
• Remote Control: AKB72915207

Firmware Update Procedures

Software update methods for service technicians.

1. USB update: Download firmware to USB drive, insert in service port.
2. ISP update: Use programming tool for corrupted firmware.
3. Factory reset: Clear user settings and restore defaults.

CAUTION! Do not interrupt power during firmware update.

Service Mode Access

Reset: Service Menu > Factory Reset > Confirm

Support: LG Service Center 1-800-243-0000; www.lg.com