42SL80YD-AA (CHASSIS:LB91T) - LG TV Service Manual (repair manual). Page 38

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D. Function error
External device recognition error 
Established
date 
Revised date 
2008. 3 .26
11/13
LCD  TV
Error
symptom
Standard Repair Process
Check technical 
information
- Fix information
S/W Version
N
Technical 
information?
Check 
input 
signal
Signal
input?
Y
External Input and
Component
Recognition error
Replace Main B/D
- S/W Version
Y
g
N
Check and fix 
external device/cable
RGB,HDMI/
DVI, Optical
Recognition error
Replace Main B/D
Fix in 
accordance 
ith t h i l
with technical 
information
11
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