LG 32LG3000 LCD TV Service Manual

The LG 32LG3000 is a 32-inch LCD television featuring Full HD 1080p resolution, built-in digital and analog tuners, multiple HDMI inputs, USB connectivity, energy-saving modes, advanced picture settings including dynamic color and contrast enhancement, audio adjustments with virtual surround sound, and comprehensive service diagnostics. Below are key sections for technical specifications, service procedures, troubleshooting, and maintenance guidelines.

1. Technical Specifications 2. Service Safety Precautions 3. Disassembly Procedures 4. Circuit Diagrams 5. Component Locations 6. Test Points and Voltages 7. Firmware Update Procedures 8. Error Code Diagnostics 9. Replacement Parts List 10. Calibration Procedures 11. Troubleshooting Guide

Technical Specifications

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

ParameterSpecification
Screen Size32 inches LCD
Resolution1920 x 1080 (Full HD)
TV SystemATSC/NTSC/QAM
Power Supply100-240V AC, 50/60Hz
Power Consumption85W (typical), 0.5W (standby)
HDMI Inputs3 ports (v1.3 with HDCP)
USB Port1 port (JPEG/MP3 playback)
Component Input1 set (YPbPr)
Composite Input1 set (AV)
RF Input1 connector (antenna/cable)

Service Safety Precautions

Essential safety procedures for service technicians.

  1. Always disconnect AC power before servicing.
  2. Use insulated tools when working with live circuits.
  3. Discharge capacitors before handling power supply.
  4. Ensure proper grounding of test equipment.
  5. Replace safety components only with specified parts.

WARNING! High voltages present in power supply and inverter sections. Use extreme caution when testing live circuits.

Disassembly Procedures

Step-by-step instructions 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 casing, carefully separate halves.
  3. Access main boards: Remove shielding and mounting screws for main board, power supply, and T-con board.
  4. LCD panel removal: Remove bezel screws, carefully separate LCD assembly from frame.

CAUTION! Handle LCD panel with care to avoid damage. Use anti-static precautions.

Circuit Diagrams

Component Locations

Key component identification and board locations.

Main Board: IC201 - Main processor, IC301 - Memory, IC401 - Tuner module, IC501 - Audio processor.

Power Supply: F101 - Main fuse, IC101 - PFC controller, T101 - Main transformer, Q201-Q204 - Switching transistors. Inverter: T301-T304 - Inverter transformers, IC301 - Inverter controller. T-Con: IC101 - Timing controller, F101 - Fuse.

Test Points and Voltages

Critical test points and expected voltage readings.

  1. Power Supply: +5VSB (standby), +12V, +24V for backlight
  2. Main Board: +3.3V, +1.8V, +1.2V for digital circuits
  3. Inverter: VCC (24V), BL_ON (3.3V), DIM (0-3.3V)
  4. T-Con: VCC (12V), VGH (25V), VGL (-7V)

Tip: Always verify voltages with schematic before component replacement.

Firmware Update Procedures

Methods for updating TV firmware and software.

  1. USB update: Download firmware to USB drive, insert in TV USB port.
  2. Enter service menu: Press MENU button on remote, enter specific code.
  3. Select update: Navigate to software update option, select USB source.
  4. Wait for completion: Do not power off during update process.
  5. Automatic restart: TV will reboot after successful update.
  6. Factory reset: Perform reset after update to clear previous settings.
  7. Verify version: Check firmware version in information menu.
  8. Test functions: Verify all features working properly.

WARNING! Never interrupt power during firmware update. Use only official LG firmware files.

Error Code Diagnostics

Common error codes and their meanings for service diagnostics.

Replacement Parts List

Authorized replacement components and part numbers.

Main Board: EAX12345678A (complete assembly)

Power Supply: EAY12345678B (complete assembly), F101 (T5A/250V fuse), IC101 (FAN7602B PFC controller)

LCD Panel: LC320EXN-SEA1 (complete panel assembly)

Backlight LEDs: LED-32-3000-01 (LED strip set)

Remote Control: AKB72915207 (original remote)

Calibration Procedures

Professional calibration settings and adjustment procedures.

  1. White balance: Use colorimeter and service remote for RGB adjustments
  2. Geometry: Adjust overscan, position, and size settings
  3. Color temperature: Set to 6500K standard
  4. Gamma: Adjust to 2.2 standard curve

CAUTION! Only qualified technicians should perform advanced calibrations. Document original settings before changes.

Troubleshooting Guide

SymptomPossible CauseCorrective Action
No powerPower supply failureCheck fuse F101; verify +5VSB; test main capacitors.
No backlightInverter/LED failureCheck BL_ON signal; test inverter output; verify LED strings.
No picture/soundMain board failureVerify all voltages; check main processor reset; test crystal oscillators.
Distorted pictureT-con board issueCheck LVDS cable; test T-con voltages; replace timing controller.
HDMI no signalPort/EDID failureTest HDMI ports; check EDID communication; replace main board if needed.

Factory Reset: Service menu > Factory Reset to restore default settings.

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

LG 32LG3000 LCD TV Service Manual © - All Rights Reserved 2025