LG 55UB8500-UA Service Manual page 87

Standard Repair Process
LCD TV
symptom
☞ A3 A3
Check RF Signal level
Y
Normal
Signal?
N
Check RF Cable
Connection
1. Reconnection
2. Install Booster
N
Normal Normal
Picture?
Y
Close
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Only for training and service purposes
Error
Picture broken/ Freezing Picture broken/ Freezing
. By using Digital signal level meter By using Digital signal level meter
. By using Diagnostics menu on OSD
( Setting→ Quick Setting → Programmes → Programme Tuning → Manual Tuning → Check the Signal )
- 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` DVD Player ,Set Top Box, Different maker TV etc
Normal
Picture?
N
Contact with signal distributor Contact with signal distributor
or broadcaster (Cable or Air)
A. Video error
☞ A4
Y
Check
SVC
S/W Version
Bulletin?
S/W Upgrade
Normal
Picture?
Close
3
Established
2013.01.31
date
Revised date Revised date
N
Tuner soldering T
Y
N
Y
3/16 3/16
Y
Check
Close Close
ld i
N
Replace
Main B/D
LGE Internal Use Only