LG OLED55B7P Service Manual page 34

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
13
date
Replace Main B/D
Replace Main B/D
13/15