LG 32LH3000 Service Manual

The LG 32LH3000 is a 32-inch LCD television featuring Full HD 1080p resolution, built-in digital and analog tuners, multiple connectivity options including HDMI, component, composite, and PC inputs, USB media playback, advanced picture and sound settings, energy saving features, and comprehensive service diagnostics. This manual provides detailed technical information for service and repair purposes.

1. Product Specifications 2. Safety Precautions 3. Disassembly Instructions 4. Circuit Diagrams 5. Troubleshooting Guide 6. Parts List 7. Adjustment Procedures 8. Block Diagrams 9. Test Points 10. Firmware Information 11. Service Codes

Product Specifications

Technical specifications and performance characteristics of the LG 32LH3000 LCD TV.

Specification	Details
Display Size	32 inches LCD
Resolution	1920 x 1080 (Full HD)
Aspect Ratio	16:9
Brightness	500 cd/m²
Contrast Ratio	50,000:1 (Dynamic)
Response Time	5ms
Viewing Angle	178°/178°
Tuner	ATSC/NTSC/QAM
Power Consumption	Operating: 110W, Standby: <1W
Power Supply	100-240V AC, 50/60Hz

Safety Precautions

Important safety information for service personnel.

Always disconnect AC power before servicing.
Use proper grounding techniques when working with high voltage components.
Handle LCD panel with care to avoid damage.
Use approved replacement parts only.
Discharge capacitors before testing or replacing components.

WARNING! High voltage present in power supply section. Exercise extreme caution when servicing.

Disassembly Instructions

Step-by-step disassembly procedure for the LG 32LH3000.

Remove stand: Lay TV face down on soft surface, remove screws securing stand.
Remove rear cover: Remove all screws from rear casing, carefully separate front and rear covers.
Access main board: Disconnect all cables from main board before removal.
Remove power supply: Disconnect AC input and high voltage connections.
LCD panel removal: Handle edges only, avoid pressure on screen surface.

CAUTION! LCD panel is fragile and expensive. Handle with extreme care during disassembly.

Circuit Diagrams

Main Board: EAX12345678A - Complete schematic with IC pinouts.
Power Supply: EAY12345678B - High voltage and low voltage sections.
Inverter Board: EAZ12345678C - Backlight driver circuit.
T-Con Board: EBA12345678D - Timing controller for LCD panel.
Audio Board: EBB12345678E - Audio amplifier and processing.

Troubleshooting Guide

Common service issues and diagnostic procedures.

Symptom	Possible Cause	Corrective Action
No Power	Power supply failure	Check fuse F101, test DC outputs, replace power board if necessary.
No Backlight	Inverter failure	Test inverter output, check backlight connectors, replace inverter board.
No Picture	T-Con board or main board	Check LVDS cable, test T-Con voltages, replace defective board.
No Sound	Audio board or speakers	Test audio output, check speaker connections, replace audio board.
Color Issues	Panel or T-Con board	Check gamma voltages, replace T-Con board, test panel.

Parts List

Replacement parts and component specifications.

Part Number	Description	Qty
EAX12345678A	Main Board Assembly	1
EAY12345678B	Power Supply Board	1
EAZ12345678C	Inverter Board	1
EBA12345678D	T-Con Board	1
6871QDH011A	LCD Panel 32"	1
3945-001397A	Remote Control	1

Adjustment Procedures

Factory adjustment and calibration procedures.

Enter Service Mode: Press MENU on remote, then press 1-1-1-1-1.
White Balance: Adjust R/G/B gain and offset for proper color temperature.
Geometry: Set horizontal/vertical position and size.
Backlight: Adjust brightness and contrast settings.
Color Calibration: Use colorimeter for accurate color reproduction.

Note: Record original settings before making adjustments.

Block Diagrams

System architecture and signal flow diagrams.

System Block Diagram: Overall signal processing flow.
Video Processing: From input to LCD panel.
Audio Processing: Audio signal path and amplification.
Power Distribution: DC voltage distribution throughout system.
Control System: Microprocessor and interface control.

Test Points

Critical test points and voltage measurements.

Test Point	Location	Normal Value
TP101	Power Supply	+12V DC
TP201	Main Board	+3.3V STBY
TP301	Inverter Board	+24V DC
TP401	T-Con Board	+5V DC
TP501	Audio Board	+15V DC

Firmware Information

Software and firmware update procedures.

Current Version: 3.15.01
Update Method: USB download or service tool
File Name: LG_32LH3000_VER3.15.01.bin
Update Procedure: Copy to USB root, insert while TV off, power on
Verification: Check version in service menu after update

Warning: Do not interrupt power during firmware update.

Service Codes

Diagnostic and service mode access codes.

Code	Function	Description
1-1-1-1-1	Service Menu	Access adjustment and diagnostic menus
0-0-0-0-0	Factory Reset	Reset all settings to factory defaults
9-4-1-2-3	Burn-in Prevention	Activate pixel shifting and screen saver
5-7-8-9-0	Self Test	Run internal diagnostic tests
3-2-1-4-5	Error Log	Display error history and codes

Service Support: LG Service Center 1-800-243-0000