37LV370S-ZB, 37LV375G-ZC, 37LV375S-ZC, 37LV375W-ZC (CHASSIS:LD12B) - LG TV Service Manual (repair manual). Page 50

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No response in remote controller and main unit key error
Check remote 
controller battery 
and product 
selection
Y
N
Normal?
Check for 3 
wave length
3 wave
length?
N
Check and 
replace battery
Reset or replace 
remote controller
Y
Check IR sensor
voltage (5V)
Y
N
Normal
voltage?
Normal
voltage?
Y
N
Check and fix 3.5V 
Line of Main B/D
Replace Analog B/D (Old)
/ Main B/D (New)
Replace PRE –AMP
Replace Key PCB 
Check for 3 
wave length 
florescent light
Request for florescent light 
replacement or attach mesh 
cloth
OR
Check for TV operation 
after removing other 
product 
remote controller battery
Check for 
external wave 
length effect
OR
OR
Established 
date 
Electronics 6-3
Standard Repair Process
Revised date 
2008. 2 . 1
LCD  TV
D. Function error
No response in remote controller, 
key error, recording error, memory error 
10/13
173
Error 
symptom
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