LG 50UH5500 Service Manual page 86

Standard Repair Process
Error
symptom
. By using Digital signal level meter
☞ A3
. By using Diagnostics menu on OSD
Check RF Signal level
( All Settings→ Channels→ Channel Tuning→ Manual Tuning → Signal Strength, Signal Quality)
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
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
A. Video error
Picture broken/ Freezing
(By connecting RF Cable at other equipment)
☞ A4
Y
Normal Check
S/W Version
Picture?
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
3
3/16
Y
Check
Close
Tuner soldering
N
Replace
Main B/D