LG Electronics 42LT640H-ZA A. Picture Problem, By using Digital signal level meter, Check, Lcd Tv

Standard Repair Process

	Error	A. Picture Problem	Established
LCD TV			date
	symptom	Picture broken/ Freezing	Revised date	3/13

Check RF Signal level

. By using Digital signal level meter

. By using Diagnostics menu on OSD ( Menu→Setup→Manual Tuning)

-Signal strength (Normal : over 30%)

-Signal Quality (Normal: over 30%)

Normal

Y

Check whether other equipments have problem or not.

(By connecting RF Cable at other equipment)

Signal?

N

→DVD Player ,Set-Top-Box, Different maker TV etc`

Check RF Cable

Connection

1. Reconnection

Normal N Picture?

Y

Close

Normal	Y	Check
Picture?		S/W Version

N

Contact with signal distributor or broadcaster (Cable or Air)

SVC N

Bulletin?

Y

S/W Upgrade

Normal N Picture?

Y

Close

Check

Tuner soldering

Normal	Y Close
Picture?
N

Replace

Main B/D

3

Copyright © 2012 LG Electronics. Inc. All rights reserved.	LGE Internal Use Only
Only for training and service purposes