LG 49UF771V Service Manual page 69

Standard Repair Process
Error
symptom
☞ A3
Check RF Signal level
Y
Check whether other equipments have problem or not.
Normal
Signal?
→ DVD Player ,Set-Top-Box, Different maker TV etc`
N
Check RF Cable
Connection
1. Reconnection
2. Install Booster
N
Normal
Picture?
Y
Close
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A. Video error
Picture broken/ Freezing
. By using Digital signal level meter
. By using Diagnostics menu on OSD
( Advanced→ Channels→ Channel Tuning→ Manual Tuning → Check the Signal )
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
(By connecting RF Cable at other equipment)
Normal
Picture?
N
Contact with signal distributor
or broadcaster (Cable or Air)
☞ A4
Y
Check SVC
S/W Version
Bulletin?
S/W Upgrade
Normal
Picture?
Close
3
Established
date
Revised date
N
Tuner soldering
Y
N
Y
3/16
Y
Check
Close
N
Replace
Main B/D
LGE Internal Use Only