A. Video error
Tuning fail, Picture broken/ Freezing
Y
N
Check RF Signal level
Normal
Signal?
Check
S/W Version
S/W Upgrade
SVC
Bulletin?
Normal
Picture?
Y
N
Y
Close
Check RF signal cable
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ Set
-Top-Box, Different maker TV etc
Standard Repair Process
Established
date
Revised date
4/14
LCD TV
Error
symptom
Contact with
signal distributor
or broadcaster
Close
N
Check
Tuner soldering
Replace
Main B/D
2013. 01 .24
A5
A6
Summary of Contents for 42LB550A
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Page 49: ...Appendix Exchange PSU LED driver No Light Dim Light Dim Light Dim Light No picture Sound Ok ...