LG 60LN57 Series Service Manual page 78

Standard Repair Process Detail Technical Manual
symptom
LCD TV
Content
<ALL MODELS>
Copyright © 2013 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Error
A. Video error_Video error, video lag/stop
TUNER input signal strength checking method
Established
date
Revised
date
MENU  support  signal test
 select channel
When the signal is strong, use the
attenuator (-10dB, -15dB, -20dB etc.)
38 / 88
2012. 12 .06
A6
LGE Internal Use Only