LG 55LA86 Series Service Manual page 102

Standard Repair Process
Error
LCD TV
symptom
Check
input
signal
Check and fix
external device/cable
D. Function error
External device recognition error
Check technical
Y
information
Signal
- Fix information
input?
- S/W Version
N
Established
Revised date
External Input and
N
Technical
Component
information?
Recognition error
Y
RGB,HDMI/
DVI, Optical
Fix in
Recognition error
accordance
with technical
information
2012. 12 .06
date
Replace Main B/D
Replace Main B/D