LG 32LD450 Service Manual

The LG 32LD450 is a 32-inch LCD television featuring Full HD 1080p resolution, built-in digital and analog tuners, multiple HDMI inputs, USB connectivity, Intelligent Sensor technology for automatic picture optimization, Clear Voice II for enhanced audio clarity, and Energy Star compliance. Below are key sections for technical specifications, disassembly procedures, circuit diagrams, troubleshooting, and service adjustments.

1. Product Overview 2. Technical Specifications 3. Disassembly Procedures 4. Circuit Diagrams 5. PCB Layouts 6. Troubleshooting Guide 7. Service Adjustments 8. Parts List 9. Safety Precautions 10. Block Diagrams 11. Test Points & Voltages

Product Overview

Main components: LCD panel with LED backlight, main board, power supply board, T-CON board, and control board.

Component	Description
Main Board	EAX61731001 - Handles signal processing and inputs
Power Supply	EAX61731002 - Provides various DC voltages
T-CON Board	Controls LCD panel timing and drive signals
LCD Panel	32-inch Full HD (1920x1080) with LED backlight
Control Board	Front panel buttons and IR receiver
Speakers	2x 10W stereo speakers
Inputs	3x HDMI, 2x USB, Component, Composite, RF
Outputs	Digital audio output, headphone jack

Technical Specifications

Screen Size: 32 inches LCD
Resolution: 1920 x 1080 Full HD
Backlight: LED
TV System: ATSC/NTSC/QAM
Inputs: 3 HDMI, 2 USB, Component, Composite, RF, PC Input
Sound Output: 20W (10W x 2)
Power Consumption: 70W typical, <1W standby
Power Supply: 100-240V AC, 50/60Hz
Dimensions: 29.1" x 18.9" x 3.3" (with stand)
Weight: 19.8 lbs (with stand)

Disassembly Procedures

Follow these steps to safely disassemble the unit for service.

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.
Disconnect cables: Note cable positions before disconnecting from main board.
Remove main board: Remove mounting screws and carefully lift board out.
Access power supply: Remove screws and disconnect all power connectors.
Remove LCD panel: Extreme care required - follow anti-static procedures.

WARNING! Always disconnect power before disassembly. Handle LCD panel with care to avoid damage.

Circuit Diagrams

Complete schematic diagrams for all major circuits.

Main Board Schematic - EAX61731001
Power Supply Schematic - EAX61731002
T-CON Board Schematic
Audio Amplifier Circuit
Backlight Driver Circuit
Control Board Schematic

Note: All diagrams include component values and test points.

PCB Layouts

Physical layout diagrams for circuit board troubleshooting.

Board	Layout Diagram	Component Side
Main Board	Top and bottom layer views	Component locations marked
Power Supply	Single layer layout	All components identified
T-CON Board	Detailed component placement	Test points highlighted
Control Board	Simple single layer	Button and IR locations

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
No power	Power supply failure	Check fuse F101, measure standby voltage
No backlight	LED driver circuit	Check backlight inverter, LED strings
No picture	T-CON board, main board	Measure LVDS voltages, check T-CON fuse
No sound	Audio IC, speakers	Check audio IC U601, speaker connections
HDMI not working	HDMI ports, main IC	Check HDMI IC, port connections
USB not recognized	USB controller	Check USB IC U701 and 5V supply

Service Adjustments

Factory service mode adjustments and calibration procedures.

Enter service mode: Press MENU on remote, then press 1-1-1-1-1
White balance adjustment: Use color analyzer for proper calibration
Backlight adjustment: Adjust LED current for uniform brightness
Panel settings: Configure timing parameters for optimal performance
Reset to factory: Use factory reset option in service menu

CAUTION! Make careful note of original settings before making adjustments.

Parts List

Replacement parts and component specifications.

Part Number	Description	Qty
EAX61731001	Main Board Assembly	1
EAX61731002	Power Supply Board	1
EAX61731003	T-CON Board	1
6871QDH018A	LCD Panel 32"	1
LGAC34934001	Remote Control	1
LGE61588401	Stand Assembly	1

Safety Precautions

Critical safety information for service technicians.

Always disconnect AC power before servicing
Use isolation transformer when working on live circuits
Discharge capacitors before handling power supply
Follow ESD precautions when handling circuit boards
Handle LCD panel with extreme care to avoid breakage
Ensure proper reassembly to maintain safety certifications

WARNING! High voltages present in power supply and backlight circuits.

Block Diagrams

System block diagrams showing signal flow and interconnections.

Overall System Block Diagram
Main Board Signal Flow
Power Distribution Diagram
Audio/Video Processing Chain
Backlight Control System
Input/Output Connectivity

Test Points & Voltages

Critical test points and expected voltage measurements.

Test Point	Location	Normal Voltage
STBY 5V	Power Supply CN201 pin 1	5.0V ±5%
12V Main	Power Supply CN201 pin 3,4	12.0V ±5%
24V Backlight	Power Supply CN202	24.0V ±5%
3.3V Digital	Main Board U101 output	3.3V ±5%
1.8V Core	Main Board U102 output	1.8V ±5%
LVDS 12V	T-CON Board F101	12.0V ±5%

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