32LN5100 (CHASSIS:LL35B) - LG TV Service Manual (repair manual). Page 58

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Standard Repair Process Detail Technical Manual
Remote controller operation checking method
D. Function error_ No response in remote controller,
key error
A17
Established 
date 
Revised 
date
Error 
symptom
Content
LCD  TV
2013. 01 .09
Remote controller operation checking method
<ALL MODELS>
date 
P600
1
GND
2
KEY1
3
KEY2
4
3.5V_ST
5
GND
6
LED_R/BUZZ
7
IR
7
IR
8
GND
9
GND
Checking order
1, 2.  Check IR cable condition between IR & Main board.
3.
Check the st-by 3.5V on the terminal 4. 
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