LG 55LF5950 Service Manual page 43

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. Video error
Picture Problem, Picture broken/ Freezing
( Menu→ Quick→ Channels → 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)
ex) 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
Established
2015. 04. 23
date
Revised date 2015. 04 .23
N
Check
Normal
Tuner soldering
Picture?
Replace
Main B/D
N
3/13
Y
Close
N
LGE Internal Use Only