LG 43LJ55 -U Series Service Manual page 28

Standard Repair Process
Error
symptom
Check
input
signal
Check and fix
external device/cable
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Only for training and service purposes
D. Function error
External device recognition error
Check technical
Y
information
Signal
input? - Fix information
- 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
date
Replace Main B/D
Replace Main B/D
14/16
LGE Internal Use Only