LG 32LF550B Service Manual page 49

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
date
Revised date
External Input
N
Technical
and Component
information
Recognition error
Y
Fix in
accordance
HDMI, Optical
with technical
Recognition error
information
12/14
Replace Main B/D
Replace Main B/D
LGE Internal Use Only