LG 55UB820T Service Manual page 65

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
HDMI/
DVI, Optical
Fix in
Recognition error
accordance
with technical
information
14
2013.01.31
date
Replace Main B/D
Replace Main B/D
14/16