LG 55LA86 Series Service Manual page 114

Standard Repair Process Detail Technical Manual
Error
Established
A. Video error_Color error
2012. 12 .06
symptom
date
LCD TV
Revised
Adjustment Test pattern - ADJ Key
Content A12
date
You can view 6 types of patterns using the ADJ Key
Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..)
4.Video error (Classification of MODULE or Main-B/D!)