LG M2550D Service Manual

LED LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LD11C
MODEL : M2550D
M2550D-PSN
North/Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Internal Use Only
P/NO : MFL63642153(1108-REV00) Printed in Korea

LG M2550D Specifications

General

3D	No
Aspect ratio	16:9
Display surface	Matt
Display diagonal	25 \
Viewing angle, vertical	160 °
Contrast ratio (dynamic)	5000000:1
Display number of colors	16.78 million colors
Viewing angle, horizontal	170 °
Digital vertical frequency	56 - 75 Hz
Digital horizontal frequency	30 - 83 kHz
Display brightness (typical)	250 cd/m²
Supported graphics resolutions	1920 x 1080 (HD 1080)
Audio system	Dolby Surround X
TV tuner integrated	Yes
Screen format adjustments	4:3, 14:9, 16:9
Digital signal format system	DVB-C, DVB-T
Certification	TUV-GS, FCC-B, CE.
Product color	Black
Market positioning	-
Compliance industry standards	DDC2B
RMS rated power	6 W
Number of speakers	2
USB hub version	2.0
DVI-I ports quantity	0
LED indicators	Power
Tilt angle range	-5 - 15 °
Panel mounting interface	200 x 100 mm
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (standby)	0.3 W
Power consumption (typical)	50 W
Cables included	AC, VGA
Sustainability certificates	ENERGY STAR

Weight and Dimensions

Depth (with stand)	180 mm
Height (with stand)	451 mm
Weight (with stand)	4850 g
Depth (without stand)	53 mm
Width (without stand)	595 mm
Height (without stand)	382 mm
Weight (without stand)	4280 g

Summary

Safety Precautions

General Guidance for Servicing

Provides instructions for safe servicing practices and electrical shock prevention.

Leakage Current Checks

Details procedures for hot and cold AC leakage current testing.

Servicing Precautions

General Servicing Precautions

Covers essential safety steps before and during equipment servicing.

Handling Sensitive Components

Guidelines for safely working with Electrostatic Sensitive (ES) components.

General Soldering Guidelines

Details best practices for soldering, including tool and material selection.

Component Servicing Procedures

Component Removal and Replacement

Procedures for removing and replacing ICs, transistors, diodes, and fuses.

Circuit Board Foil Repair

Instructions for repairing damaged copper traces on circuit boards.

ADJUSTMENT INSTRUCTION

Application, Designation, and Tool Options

Main PCB Download Procedure

Adjustment Procedures

USB Software Update

ADC Calibration Process

Calibration and Verification

White Balance and DPM Checks

Model, SW Version, and Adjust Checks

TROUBLESHOOTING

Power-Up Boot Fail Troubleshooting

Step-by-step guide to diagnose and fix power-up boot failures.

No Picture Troubleshooting

No Picture Troubleshooting

Flowchart for diagnosing and resolving issues with no picture display.

TV Signal Troubleshooting

Digital and Analog TV Video Issues

Video Input Troubleshooting

Component and RGB Video Issues

HDMI and Audio Troubleshooting

HDMI Video and Audio Issues