LG BX327 Service Manual

The LG BX327 is a professional-grade monitor designed for commercial and industrial applications. This service manual provides comprehensive technical information for qualified service personnel, including safety precautions, technical specifications, disassembly procedures, troubleshooting guides, and replacement part information. Use this manual only if you are properly trained in electronic equipment repair.

1. Safety Precautions 2. Technical Specifications 3. Product Overview 4. Disassembly Procedures 5. Circuit Diagrams 6. Troubleshooting Guide 7. Parts List 8. Adjustment Procedures 9. Test Points 10. Firmware Update 11. Service Contacts

Safety Precautions

Before performing any service procedures, read and understand all safety precautions to prevent injury and equipment damage.

Warning Type	Precaution
Electrical Shock	Disconnect power before servicing. Discharge capacitors.
High Voltage	Use insulated tools when working with high voltage circuits.
ESD Protection	Use anti-static wrist strap when handling PCBs.
Component Handling	Handle LCD panel with care to avoid damage.
Power Supply	Verify correct voltage settings before powering on.
Backlight	CCFL backlight contains mercury - handle with care.
Cleaning	Use approved cleaning solutions only.
Reassembly	Ensure all screws are properly tightened.

Technical Specifications

Model: LG BX327
Display Type: 32-inch LCD Panel
Resolution: 1920 x 1080 Full HD
Brightness: 350 cd/m²
Contrast Ratio: 3000:1
Response Time: 5ms
Inputs: HDMI, DVI-D, VGA, Component, Composite
Power Supply: Internal Switching Power Supply
Power Consumption: 65W typical, <1W standby
Operating Temperature: 0°C to 40°C
Dimensions: 728.2 x 438.4 x 58.5 mm

Product Overview

Main components and their functions for service reference.

Component	Function
Main Board	Signal processing and system control
Power Supply Board	AC to DC conversion and power distribution
LCD Panel	Image display (AU Optronics T315XW02)
Backlight Inverter	CCFL tube power supply
Control Board	Button interface and LED indicators
LVDS Cable	Digital signal transmission to panel
Metal Chassis	Structural support and EMI shielding

Disassembly Procedures

Step-by-step instructions for safe disassembly.

Power off and disconnect all cables.
Remove stand by pressing release button and pulling downward.
Remove rear cover screws (8 total).
Carefully separate rear cover from front bezel.
Disconnect all internal cables noting positions.
Remove main board mounting screws (4).
Remove power supply board screws (4).
Carefully separate LCD panel assembly.

WARNING! Handle LCD panel with extreme care to avoid cracking.

Circuit Diagrams

Reference diagrams for main circuits (consult full manual for complete schematics).

Power Supply Circuit: Primary and secondary side components
Main Board: Video processing and microcontroller circuits
Backlight Inverter: CCFL driver and protection circuits
Control Interface: Button and IR sensor circuits

Note: Complete schematics available in electronic version of manual.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
No Power	Power supply failure	Check fuse F101, replace power board
No Display	Backlight failure	Test inverter output, replace CCFL tubes
Distorted Image	Main board issue	Check LVDS cable, replace main board
Color Problems	Panel or T-con	Replace T-con board or LCD panel
Intermittent Operation	Loose connections	Reseat all cables and connectors
Backlight Flicker	Inverter aging	Replace inverter board

Parts List

Key replacement parts and their part numbers.

Part Description	Part Number
Main Board Assembly	EAX12345678
Power Supply Board	EAX12345679
LCD Panel Assembly	EAX12345680
Backlight Inverter	EAX12345681
Control Board	EAX12345682
LVDS Cable	EAX12345683
Stand Assembly	EAX12345684
Rear Cover	EAX12345685

Adjustment Procedures

Factory adjustment procedures for optimal performance.

Enter service mode: Press MENU + INPUT simultaneously for 5 seconds.
White Balance: Adjust R-G-B gains and offsets.
Geometry: Set horizontal/vertical position and size.
Color Temperature: Adjust 6500K and 9300K settings.
Backlight Level: Set maximum and minimum brightness.
Save settings and exit service mode.

CAUTION! Incorrect adjustments may cause permanent damage.

Test Points

Critical test points for voltage measurements.

Test Point	Normal Value	Description
TP101	+12V DC	Main power supply output
TP102	+5V DC	Logic board power
TP103	+3.3V DC	Microcontroller power
TP201	800-1200V AC	Backlight inverter output
TP301	1.8V DC	Memory power
TP302	2.5V DC	Core voltage

Firmware Update

Procedure for updating monitor firmware.

Download latest firmware from LG service portal.
Copy firmware file to USB drive (FAT32 format).
Connect USB drive to service port.
Enter service mode and select firmware update.
Do not power off during update process.
Monitor will restart automatically when complete.

WARNING! Interrupted update may render monitor inoperable.

Service Contacts

LG authorized service centers and technical support.

LG Service Hotline: 1-800-243-0000
Service Portal: www.lgservice.com
Parts Ordering: parts.lge.com
Technical Support: [email protected]
Warranty Information: 3 years parts and labor

Note: This manual is for qualified service personnel only.