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42LS341C, 42LS3450, 42LS345S, 42LS345T (CHASSIS:LD21C) - LG TV Service Manual (repair manual). Page 51

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Check technical 
information
- Fix information
- S/W Version
N
Y
Technical 
information?
Check 
input 
signal
Signal
input?
Y
N
External Input and
Component
Recognition error
Check and fix 
external device/cable
RGB,HDMI/
DVI, Optical
Recognition error
Replace Main B/D
Replace Main B/D
Fix in 
accordance 
with technical 
information
D. Function error
External device recognition error 
Established
date 
Revised date 
12/14
LCD  TV
Error
symptom
Standard Repair Process
2012. 01 .14
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