LG 60LN57 Series Service Manual page 61

Standard Repair Process
Error
LCD TV
symptom
. By using Digital signal level meter
☞ A6
. By using Diagnostics menu on OSD
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. Picture Problem
Picture broken/ Freezing
( Menu→ Set up→ 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`
Y
Normal
Picture?
N
Contact with signal distributor
or broadcaster (Cable or Air)
☞ A7
Check
SVC
S/W Version Bulletin?
Y
S/W Upgrade
Normal
Picture?
Y
Close
21 / 88
Established
2012. 12 .06
date
Revised date
N
Normal
Use Signal Test
Picture?
Check Signal status
Tuner soldering
N
Replace
Main B/D
Y
Close
N
Check
LGE Internal Use Only