LG Electronics 32LM640S/640T-ZA service manual Check RF Signal level, S/W Version

Standard Repair Process

	Error	A. Picture Problem	Established	2010. 12 .14
LCD TV			date
	symptom	Picture broken/ Freezing	Revised date		3/13

☞A6

Check RF Signal level

. By using Digital signal level meter

. By using Diagnostics menu on OSD

( Menu→ Set up→ Support → Signal Test )

Normal

Y

- Signal strength (Normal : over 50%)

- Signal Quality (Normal: over 50%)

Check whether other equipments have problem or not.

(By connecting RF Cable at other equipment)

Signal?

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

N

☞ A7

■Menu→Setup →Booster

Check RF Cable

Connection

1.Reconnection

2.Install Booster

Normal	Y	Check
Picture?		S/W Version

N

SVC N

Bulletin?

Y

Booster menu	Normal	Y
On→Off: Check	Picture?	Close
Off→On: Check
	N

Normal N Picture?

Y

Close

Contact with signal distributor or broadcaster (Cable or Air)

S/W Upgrade

Normal N Picture?

Y

Close

Check

Tuner soldering

Replace

Main B/D

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