47LS5700 (CHASSIS:LJ22E) - LG TV Service Manual (repair manual). Page 78

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P4102
1
SCL
2
SDA
3
GND
4
KEY1
5
KEY2
6
St 3.5V
7
GND
8
RED_LED
9
IR
10
GND
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. 
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
2010. 12 .14
Standard Repair Process Detail Technical Manual
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