60LM7200 (CHASSIS:LA22E) - LG TV Service Manual (repair manual). Page 127

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Checking order
1, 2.  Check IR cable condition between IR & Main board.
3.      Check the st-by 3.3V on the terminal 6.
4.     When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog 
Tester needle moves slowly, and defective when it does not move at all. 
Standard Repair Process Detail Technical Manual
Remote controller operation checking method
D. Function error_ No response in remote controller,
key error
<ALL MODELS>
A27
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
P4102
1
SCL
2
SDA
3
GND
4
KEY1
5
KEY2
6
St 3.5V
7
GND
8
RED_LED
9
IR
10
GND
2010. 12 .14
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