LG 28LM4 0B-PU Series Service Manual page 34

Standard Repair Process
Error
symptom
Check
Signal
input
input?
signal
Check and fix
external device/cable
D. Function error
External device recognition error
Check technical Check technical
Y Y
information
- Fix information
- S/W Version
N
Established
date
Revised date
Technical
N External Input and
information?
Component
Recognition error
Y
HDMI/ HDMI/
DVI, Optical
Fix in
Recognition error
accordance
with technical
information
- 34 -
11/13
Replace Main B/D
Replace Main B/D
2019