LG 42LN5700 Service Manual page 65

Standard Repair Process
Error
LCD TV
symptom
☞ A6
Check RF Signal level
Y
Normal
Signal?
N
Check RF Cable
Connection
1. Reconnection
2. Install Booster
N
Normal
Picture?
Y
Close
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Only for training and service purposes
A. Video error
Picture broken/ Freezing
. By using Digital signal level meter
. By using Diagnostics menu on OSD
( Menu → Settings → Support → Signal Test )
- 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)
→ DVD Player ,Set-Top-Box, Different maker TV etc`
Normal
Picture?
N
Contact with signal distributor
or broadcaster (Cable or Air)
☞ A7
Y
Check SVC
S/W Version Bulletin?
S/W Upgrade
Normal
Picture?
Y
Close
5 / 97
Established
2012. 12 .21
date
Revised date
N
Y
N
3/13
Check
Tuner soldering
Replace
Main B/D
LGE Internal Use Only