55LM9600 (CHASSIS:LA23E) - LG TV Service Manual (repair manual). Page 109

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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
<XXLM9600>
A27
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
A27
P4102
1
SCL
2
SDA
3
GND
4
KEY1
5
KEY2
6
St 3.5V
7
GND
8
GP4_LED_R
9
IR
10
GND
2011. 12 .14
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