50LA6650 (CHASSIS:LA33B) - LG TV Service Manual (repair manual). Page 91

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Screen
normal?
N
Y
Check external 
device 
connection 
condition
Y
N
Check and 
replace Link 
Cable
Normal?
Y
N
Screen
normal?
Replace Main B/D
(adjust VCOM)
Replace 
module
Check color condition by input
-External Input
-Component
-RGB
-HDMI/DVI
End
Vertical/Horizontal bar, residual image, light spot
Request repair 
for external 
device
A. Video error
Vertical / Horizontal bar, residual image, 
light spot, external device color error 
A12
External device screen error-Color error
External 
Input
error
Connect other external 
device and cable
(Check normal operation of 
External Input, Component, 
RGB and HDMI/DVI by 
connecting Jig, pattern 
Generator ,Set-top Box etc. 
N
Y
Replace 
Main B/D
Screen
normal?
Check screen 
condition by input
-External Input
-Component
-RGB
-HDMI/DVI
Request repair for 
external device
Component
error
RGB
error
HDMI/
DVI
Connect other external 
device and cable
(Check normal operation of 
External Input, Component, 
RGB and HDMI/DVI by 
connecting Jig, pattern 
Generator ,Set-top Box etc. 
Replace 
Main B/D
Screen
normal?
N
Y
Check S/W Version
Y
N
Check
version
S/W Upgrade
Y
N
Normal
screen?
End
Y
N
Replace Main B/D
For LGD panel
Replace
Module
Screen
normal?
End
Established
date 
Revised date 
5/13
LCD  TV
Error
symptom
Standard Repair Process
A8
☞ A10/ A11
Check Test pattern
☞ A28
For other panel
2012. 11 .30
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