LG 55SK9000PUA Service Manual page 44

Standard Repair Process
Error
symptom
Check
input
signal
Check and fix
external device/cable
D. Function error
External device recognition error
Check technical
Y
information
Signal
input? - Fix information
- S/W Version
N
Established
Revised date
N
Technical External Input
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
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