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50LA6650 (CHASSIS:LA33B) - LG TV Service Manual (repair manual). Page 90

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Color
error?
Y
N
※ Check and 
replace Link 
Cable
(LVDS) and 
contact 
condition
Y
N
Replace Main B/D
Color
error?
Check error 
color input mode
Check color by input
-External Input
-COMPONENT
-RGB
-HDMI/DVI
Y
External device
/Cable
normal
External Input/
Component
error
Check 
external 
device and
cable
Y
External device
/Cable
normal
RGB/
HDMI/DVI
error
Check external 
device and  
cable
Replace Main B/D
Replace Main B/D
N
N
A. Video error
Color error 
☞A8
N
Y
End
Replace module
Request repair 
for external 
device/cable
Color
error?
Check Test pattern
☞A12
☞ A10/ A11
Standard Repair Process
Established
date 
Revised date 
4/13
LCD  TV
Error
symptom
2012. 11 .30
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