LG 28LM4 0B-PU Series Service Manual page 26

Standard Repair Process
Error
symptom
. By using Digital signal level meter
A3
. By using Diagnostics menu on OSD y
Check RF Signal level
( Advanced→ Channels→ Channel Tuning→ Manual Tuning → Check the Signal )
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
Check whether other equipments have problem or not.
Y
Normal
Signal?
→ DVD Player ,Set-Top-Box, Different maker TV etc`
N
Check RF Cable
Connection
1. Reconnection
2. Install Booster
Normal N
Picture?
Y
Close
A. Video error
Picture broken/ Freezing
g g
(By connecting RF Cable at other equipment)
A4 A4
Y
Normal Check
Picture? S/W Version
N
Contact with signal distributor
or broadcaster (Cable or Air)
Established
date
Revised date
N
SVC
Bulletin?
Y
S/W Upgrade
N
Normal
Picture?
Y
Close
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3/13
Check
Y
Close
Tuner soldering
N
Replace Replace
Main B/D
2019